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Sports Medicine

, Volume 6, Issue 3, pp 146–168 | Cite as

Muscle Strength and Its Development

New Perspectives
  • Roger M. Enoka
Review Article

Summary

Skeletal muscle undergoes substantial adaptation when it is subjected to a strength training regimen. At one extreme, these effects are manifested as profound morphological changes, such as those exemplified by bodybuilders. However, it is possible to increase strength without any change in muscle size. This dissociation underscores the notion that strength is not solely a property of muscle but rather it is a property of the motor system. The nervous system seems to be of paramount importance for the expression and development of strength. Indeed, it is probable that increases in strength can be achieved without morphological changes in muscle but not without neural adaptations. This review focuses on the role of the nervous system in the development of strength. In the strength literature, 3 topics exemplify the importance of the nervous system in strength development. These 3 topics are considered in detail in the review: electromyostimulation, cross-training effects, and EMG-force relationships. Evidence is presented from several different paradigms emphasising the significant contribution of neural mechanisms to the gains in strength with short term training. Although little is known about the specific neural mechanisms associated with strength training adaptations, the literature emphasises that the measure of human performance known as strength can be influenced by a variety of neurophysiological processes.

Keywords

Muscle Strength Motor Unit Strength Training Human Skeletal Muscle Apply Physiology 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Alon G. High voltage stimulation: effects of electrode size on basic excitatory responses. Physical Therapy 65: 890–895, 1985PubMedGoogle Scholar
  2. Alvarez J, Torres JC. Slow axoplasmic transport: a fiction? Journal of Theoretical Biology 112: 627–651, 1985Google Scholar
  3. Andrews JG, Hay JG, Pai Y-C. Strength curve for the lower extremity in isometric extension. Journal of Biomechanics 20: 898, 1987CrossRefGoogle Scholar
  4. Atha J. Strengthening muscle. In Miller (Ed.) Exercise and sport sciences reviews 9, pp. 1–74, Franklin, Philadelphia, 1981PubMedCrossRefGoogle Scholar
  5. Bajzek TJ, Jaeger RJ. Characterization and control of muscle response to electrical stimulation. Annals of Biomedical Engineering 15: 484–501, 1987CrossRefGoogle Scholar
  6. Barrett B. The length and mode of termination of individual muscle fibres in the human sartorius and posterior femoral muscles. Acta Anatomica 48: 242–257, 1962PubMedCrossRefGoogle Scholar
  7. Belanger AY, McComas AJ. Extent of motor unit activation during effort. Journal of Applied Physiology 51: 1131–1135, 1981PubMedGoogle Scholar
  8. Bigland-Ritchie B. Muscle fatigue and the influence of changing neural drive. Clinics in Chest Medicine 5: 21–34, 1984PubMedGoogle Scholar
  9. Bodine SC, Roy RR, Eldred E, Edgerton VR. Maximal force as a function of anatomical features of motor units in the cat tibialis anterior. Journal of Neurophysiology57: 1730–1745, 1987PubMedGoogle Scholar
  10. Borg J, Grimby L, Hannerz J. The fatigue of voluntary contraction and the peripheral electrical propagation of single motor units in man. Journal of Physiology 340: 435–444, 1983PubMedGoogle Scholar
  11. Borg TK, Caulfield JB. Morphology of connective tissue in skeletal muscle. Tissue and Cell 12: 197–207, 1980PubMedCrossRefGoogle Scholar
  12. Botterman BR, Iwamoto GA, Gonyea WJ. Classification of motor units in flexor carpi radialis muscle of the cat. Journal of Neurophysiology 54: 676–690, 1985PubMedGoogle Scholar
  13. Boutelle D, Smith B, Malone T. A strength study utilizing the Electro-Stim 180. Journal of Orthopedic and Sports Physical Therapy 7: 50–53, 1985Google Scholar
  14. Boylls CC, Zomlefer MR, Zajac FE. Kinematic and EMG reactions to imposed interlimb phase alterations during bipedal cycling. Brain Research 324: 342–345, 1984PubMedCrossRefGoogle Scholar
  15. Buchthal F, Schmalbruch H. Contraction times of reflexly activated motor units and excitability cycle of the H-reflex. Progressive Brain Research 44: 367–376, 1976CrossRefGoogle Scholar
  16. Burke RE, Jankowska E, Bruggencate GT. A comparison of peripheral and rubrospinal synaptic input to slow and fast twitch motor units of triceps surae. Journal of Physiology 207: 709–732, 1970PubMedGoogle Scholar
  17. Burke RE, Levine DN, Tsairis P, Zajac FE. Physiological types and histochemical profiles in motor units of the cat gastrocnemius. Journal of Physiology 234: 723–748, 1973PubMedGoogle Scholar
  18. Burke RE, Tsairis P. Anatomy and innervation ratios in motor units of cat gastrocnemius. Journal of Physiology 234: 749–765, 1973PubMedGoogle Scholar
  19. Cabric M, Appell H-J. Effect of electrical stimulation of high and low frequency on maximum isometric force and some morphological characteristics in men. International Journal of Sports Medicine 8: 256–260, 1987PubMedCrossRefGoogle Scholar
  20. Cabric M, Appell H-J, Resic A. Effects of electrical stimulation of different frequencies on the myonuclei and fiber size in human muscle. International Journal of Sports Medicine 8: 323–326, 1987PubMedCrossRefGoogle Scholar
  21. Cabric M, Appell H-J, Resic A. Fine structural changes in electrostimulated human skeletal muscle. European Journal of Applied Physiology 57: 1–5, 1988CrossRefGoogle Scholar
  22. Cafarelli E. Force sensation in fresh and fatigued human skeletal muscle. In Pandolf (Ed.) Exercise and sport sciences reviews, Vol. 16, Macmillan, New York, 1988Google Scholar
  23. Cannon RJ, Cafarelli E. Neuromuscular adaptations to training. Journal of Applied Physiology 63: 2396–2402, 1987PubMedGoogle Scholar
  24. Chapman AE, Belanger AY. Electromyographic methods of evaluating strength training. Electromyography and Clinical Neurophysiology 17: 265–280, 1977PubMedGoogle Scholar
  25. Clamann HP, Gillies JD, Skinner RD, Henneman E. Quantitative measures of output of a motoneuron pool during monosynaptic reflexes. Journal of Neurophysiology 37: 1328–1337, 1974PubMedGoogle Scholar
  26. Coleman AE. Effect of unilateral isometric and isotonic contractions on the strength of the contralateral limb. Research Quarterly 40: 490–495, 1969PubMedGoogle Scholar
  27. Coyle EF, Feiring DC, Rotkis TC, Cote RW, Roby FB, et al. Specificity of power improvements through slow and fast isokinetic training. Journal of Applied Physiology 51: 1437–1442, 1981PubMedGoogle Scholar
  28. Currier DP, Lehman J, Lightfoot P. Electrical stimulation in exercise of the quadriceps femoris muscle. Physical Therapy 59: 1508–1512, 1979PubMedGoogle Scholar
  29. Currier DP, Mann R. Muscular strength development by electrical stimulation in healthy individuals. Physical Therapy 63: 915–921, 1983PubMedGoogle Scholar
  30. Davies CTM, Dooley P, McDonagh MJN, White MJ. Adaptation of mechanical properties of muscle to high force training in man. Journal of Physiology 365: 277–284, 1985PubMedGoogle Scholar
  31. Delwaide PJ, Sabatino M, Pepin JL, LaGrutta V. Reinforcement of reciprocal inhibition by contralateral movements in man. Experimental Neurology 99: 10–16, 1988PubMedCrossRefGoogle Scholar
  32. Denny-Brown D. Interpretation of the electromyogram. Archives of Neurology and Psychiatry 61: 99–128, 1949PubMedCrossRefGoogle Scholar
  33. Devine KL, LeVeau BF, Yack HJ. Electromyographic activity recorded from an unexercised muscle during maximal isometric exercise of the contralateral agonists and antagonists. Physical Therapy 61: 898–903, 1981PubMedGoogle Scholar
  34. Dietz V, Mauritz K-H, Dichgans J. Body oscillations in balancing due to segmental stretch reflex activity. Experimental Brain Research 40: 89–95, 1980CrossRefGoogle Scholar
  35. Dons B, Bollerup K, Bonde-Petersen F, Hancke S. The effect of weight-lifting exercise related to muscle fiber composition and muscle cross-sectional area in humans. European Journal of Applied Physiology 40: 95–106, 1979CrossRefGoogle Scholar
  36. Duchateau J, Hainaut K. Electrical and mechanical failures during sustained and intermittent contractions in humans. Journal of Applied Physiology 58: 942–947, 1985PubMedGoogle Scholar
  37. Duchateau J, Hainaut K. Isometric or dynamic training: differential effects on mechanical properties of a human muscle. Journal of Applied Physiology 56: 296–301, 1984PubMedGoogle Scholar
  38. Duchateau J, Hainaut K. Training effects of sub-maximal electrostimulation in a human muscle. Medicine and Science in Sports and Exercise 20: 99–104, 1988PubMedCrossRefGoogle Scholar
  39. Eccles JC, Eccles RM, Lundberg A. The action potentials of the alpha motoneurones supplying fast and slow muscles. Journal of Physiology 142: 275–291, 1958PubMedGoogle Scholar
  40. Enoka RM. Load- and skill-related changes in segmental contributions to a weightlifting movement. Medicine and Science in Sports and Exercise 20: 178–187, 1988aPubMedCrossRefGoogle Scholar
  41. Enoka RM. Neuromechanical basis of kinesiology, Human Kinetics, Champaign, 1988bGoogle Scholar
  42. Enoka RM, Rankin LL, Joyner MJ, Stuart DG. Fatigue-related changes in neuromuscular excitability of rat hindlimb muscles. Muscle and Nerve, in press, 1988Google Scholar
  43. Enoka RM, Stuart DG. Henneman’s ‘size principle’: current issues. Trends in Neurosciences 7: 226–228, 1984CrossRefGoogle Scholar
  44. Enoka RM, Stuart DG. The contribution of neuroscience to exercise studies. Federation Proceedings 44: 2279–2285, 1985PubMedGoogle Scholar
  45. Eriksson E, Haggmark T, Kiessling K-H, Karlsson J. Effect of electrical stimulation on human skeletal muscle. International Journal of Sports Medicine 2: 18–22, 1981PubMedCrossRefGoogle Scholar
  46. Erlanger J, Gasser HS. Electrical signs of nervous activity, University of Pennsylvania Press, Philadelphia, 1937Google Scholar
  47. Feldman JL, Grillner S. Control of vertebrate respiration and locomotion: a brief account. Physiologist 26: 310–316, 1983PubMedGoogle Scholar
  48. Galvani, L. De viribus electricitatis in motu musculari commentarius, 1792 (commentary on the effect of electricity on muscular motion, translated by Robert Montraville Green), E. Licht, Cambridge, MA, 1953Google Scholar
  49. Garfin SR, Tipton CM, Mubarak SJ, Woo SL-Y, Hargens AR, et al. Role of fascia in maintenance of muscle tension and pressure. Journal of Applied Physiology 51: 317–320, 1981PubMedGoogle Scholar
  50. Garnett R, Stephens JA. Changes in the recruitment threshold of motor units produced by cutaneous stimulation in man. Journal of Physiology 311: 463–473, 1981PubMedGoogle Scholar
  51. Geddes LA. A short history of the electrical stimulation of excitable tissue including electrotherapeutic applications. Physiologist 27 (Suppl.): S1–S47, 1984PubMedGoogle Scholar
  52. Gel’fand KM, Gurfinkel’ VS, Kots YM, Tsetlin ML, Shik ML. Synchronization of motor units and associated model concepts. Biophysics 8: 528–542, 1963Google Scholar
  53. Godfrey CM, Jayawardena A, Welsh P. Comparison of electrostimulation and isometric exercise in strengthening the quadriceps muscle. Physiotherapy (Canada) 31: 265–267, 1979Google Scholar
  54. Goldspink, G. Malleability of the motor system: a comparative approach. Journal of Experimental Biology 115: 375–391, 1985PubMedGoogle Scholar
  55. Greathouse DG, Nitz AJ, Matulionis DH, Currier DP. Effects of short-term electrical stimulation on the ultrastructure of rat skeletal muscles. Physical Therapy 66: 946–953, 1986PubMedGoogle Scholar
  56. Gregg RA, Mastellone AF, Gersten JW. Cross exercise: a review of the literature and study utilizing electromyographic techniques. American Journal of Physical Medicine 36: 269–280, 1957PubMedGoogle Scholar
  57. Gustafsson B, Pinter MJ. On factors determining orderly recruitment of motor units: a role for intrinsic membrane properties. Trends in Neurosciences 8: 431–433, 1985CrossRefGoogle Scholar
  58. Häkkinen K, Alen M, Komi PV. Changes in isometric force- and relaxation-time electromyographic and muscle fibre characteristics of human skeletal muscle during strength training and detraining. Acta Physiologica Scandinavica 125: 573–585, 1985aPubMedCrossRefGoogle Scholar
  59. Häkkinen K, Komi PV. Alterations of mechanical characteristics of human skeletal muscle during strength training. European Journal of Applied Physiology 50: 161–172, 1983aCrossRefGoogle Scholar
  60. Häkkinen K, Komi PV. Electromyographic changes during strength training and detraining. Medicine and Science in Sports and Exercise 15: 455–460, 1983bPubMedCrossRefGoogle Scholar
  61. Häkkinen K, Komi PV. Training-induced changes in neuromuscular performance under voluntary and reflex conditions. European Journal of Applied Physiology 55: 147–155, 1986CrossRefGoogle Scholar
  62. Häkkinen K, Komi PV, Alen M. Effect of explosive type strength training on isometric force- and relaxation-time, electromyographic and muscle fibre characteristics of leg extensor muscles. Acta Physiologica Scandinavica 125: 587–600, 1985bPubMedCrossRefGoogle Scholar
  63. Hasan Z, Enoka RM, Stuart DG. The interface between biomechanics and neurophysiology in the study of movement: some recent approaches. In Terjung (Ed.) Exercise and sport sciences reviews, Vol. 13, Macmillan, New York, 1985Google Scholar
  64. Hellebrandt FA, Parrish AM, Houtz SJ. Cross education: the influence of unilateral exercise on the contralateral limb. Archives of Physical Medicine 28: 76–85, 1947Google Scholar
  65. Henry FM, Smith LE. Simultaneous vs separate bilateral muscular contractions in relation to neural overflow theory and neuromotor specificity. Research Quarterly 32: 42–46, 1961Google Scholar
  66. Hill AV. The heat of shortening and the dynamic constants of muscle. Proceedings of the Royal Society of London, Series B 126: 136–195, 1938CrossRefGoogle Scholar
  67. Hof AL. EMG and muscle force: an introduction. Human Movement Science 3: 119–153, 1984CrossRefGoogle Scholar
  68. Hof AL, Van den Berg J. EMG to force processing I: an electrical analogue of the Hill muscle model. Journal of Biomechanics 14: 747–758, 1981aPubMedCrossRefGoogle Scholar
  69. Hof AL, Van den Berg J. EMG to force processing II: estimation of parameters of the Hill muscle model for the human triceps surae by means of a calfergometer. Journal of Biomechanics 14: 759–770, 1981bPubMedCrossRefGoogle Scholar
  70. Hof AL, Van den Berg J. EMG to force processing III: estimation of model parameters for the human triceps surae muscle and assessment of the accuracy by means of a torque plate. Journal of Biomechanics 14: 771–785, 1981cPubMedCrossRefGoogle Scholar
  71. Hof AL, Van den Berg J. EMG to force processing IV: eccentric-concentric contractions on a spring-flywheel set up. Journal of Biomechanics 14: 787–792, 1981dPubMedCrossRefGoogle Scholar
  72. Hoppeler H. Exercise-induced ultrastructural changes in skeletal muscle. International Journal of Sports Medicine 7: 187–204, 1986PubMedCrossRefGoogle Scholar
  73. Horber FF, Scheidegger JR, Grunig BE, Frey, FJ. Thigh muscle mass and function in patients treated with glucocorticoids. European Journal of Clinical Investigation 15: 302–307, 1985PubMedCrossRefGoogle Scholar
  74. Houston ME, Froese EA, Valeriote SP, Green HJ, Ranney DA. Muscle performance, morphology and metabolic capacity during strength training and detraining: a one leg model. European Journal of Applied Physiology 51: 25–35, 1983CrossRefGoogle Scholar
  75. Howald H. Malleability of the motor system: training for maximizing power output. Journal of Experimental Biology 115: 365–373, 1985PubMedGoogle Scholar
  76. Howard JD. Central and peripheral factors underlying bilateral inhibition during maximal efforts. Doctoral dissertation, University of Arizona, Tucson, 1987Google Scholar
  77. Howard JD, Enoka RM. Enhancement of maximum force by contralateral-limb stimulation. Journal of Biomechanics 20: 908, 1987CrossRefGoogle Scholar
  78. Howard JD, Ritchie MR, Gater DA, Gater DR, Enoka RM. Determining factors of strength: physiological foundations. National Strength and Conditioning Association Journal 7: 16–22, 1985CrossRefGoogle Scholar
  79. Hugon M. Methodology of the Hoffmann reflex in man. In Desmedt (Ed.) New developments in electromyography and clinical neurophysiology, S. Karger, Basel, 1973Google Scholar
  80. Hultman E, Sjöholm H, Jäderholm-Ek I, Krynicki J. Evaluation of methods for electrical stimulation of human skeletal muscle in situ. Pflügers Archiv 398: 139–141, 1983PubMedCrossRefGoogle Scholar
  81. Ikai M, Fukanaga T. A study on training effect on strength per cross-sectional area of muscle by means of ultrasonic measurement. Internationale Zeitschrift für angwandte Physiologie Einschleisslich Arbeitsphysiologie 28: 173–180, 1970Google Scholar
  82. Jallabert JL. Experiences sur l’electricite, Geneva, 1748. Quoted from S. Licht (Ed.) Therapeutic electricity and ultraviolet radiation, Elizabeth Licht, New Haven, 1959Google Scholar
  83. Jankowska E, Odutola A. Crossed and uncrossed synaptic actions and motoneurones of back muscles in the cat. Brain Research 194: 65–78, 1980PubMedCrossRefGoogle Scholar
  84. Jasmin BJ, Lavoie P-A, Gardiner PF. Fast axonal transport of acetylcholinesterase in rat sciatic motoneurons is enhanced following prolonged daily running, but not following swimming. Neuroscience Letters 78: 156–160, 1987.PubMedCrossRefGoogle Scholar
  85. Jasmin BJ, Lavoie, P-A, Gardiner PF. Individual muscle-nerves respond differently to running training as shown by axonal transport studies. Medicine and Science in Sports and Exercise 20: S9, 1988Google Scholar
  86. Jones DA, Rutherford OM. Human muscle strength training: the effects of three different regimes and the nature of the resultant changes. Journal of Physiology 391: 1–11, 1987PubMedGoogle Scholar
  87. Jones LA, Hunter IW. Effect of fatigue on force sensation. Experimental Neurology 81: 640–650, 1983PubMedCrossRefGoogle Scholar
  88. Kanda K, Burke RE, Walmsley B. Differential control of fast and slow twitch motor units in the decerebrate cat. Experimental Brain Research 29: 57–74, 1977CrossRefGoogle Scholar
  89. Kereshi S, Manzano G, McComas AJ. Impulse conduction velocities in human biceps brachii muscles. Experimental Neurology 80: 652–662, 1983PubMedCrossRefGoogle Scholar
  90. Kernell D, Eerbeek O, Verhey BA, Donselaar Y. Effects of physiological amounts of high- and low-rate chronic stimulation on fast-twitch muscle of the cat hindlimb. I. Speed- and forcerelated properties. Journal of Neurophysiology 58: 598–613, 1987PubMedGoogle Scholar
  91. Knott M, Voss DE. Proprioceptive neuromuscular facilitation: patterns and techniques, 2nd ed., Hoeber Medical Division, Harper & Row, New York, 1968Google Scholar
  92. Knuttgen HG, Kraemer WJ. Terminology and measurement in exercise performance. Journal of Applied Sport Science Research 1: 1–10, 1987Google Scholar
  93. Komi PV, Salonen M, Jarvinen M, Kokko O. In vivo registration of Achilles tendon forces in man. I. Methodological development. International Journal of Sports Medicine 8 (Suppl.): 3–8, 1987PubMedCrossRefGoogle Scholar
  94. Komi PV, Viitasalo JT, Rauramaa R, Vihko V. Effect of isometric strength training on mechanical, electrical, and metabolic aspects of muscle function. European Journal of Applied Physiology 40: 45–55, 1978CrossRefGoogle Scholar
  95. Kots JM. Trenirovka mysecnoj sily metodom elektrostimuljacii. Soobscenie 1. Teoreticeskie predposylki. Teoriya: Praktika Fizicheskoi Kultury 3: 64–67, 1971Google Scholar
  96. Kots JM, Hvilon VA. Trenirovka mysecnoj sily metodom elektrostimuljacii. Soobscenie 2. Trenirovka metodom elektriceskogo tetaniceskogo razdrazenija myscy prjamougoljnymi impulsami. Teoriya: Praktika Fizicheskoi Kultury 4: 66–73, 1971Google Scholar
  97. Kovanen V, Suominen H, Heikkinen E. Collagen of slow twitch and fast twitch muscle fibres in different types of rat skeletal muscle. European Journal of Applied Physiology 52: 235–242, 1984aCrossRefGoogle Scholar
  98. Kovanen V, Suominen H, Heikkinen E. Mechanical properties of fast and slow skeletal muscle with special reference to collagen and endurance training. Journal of Biomechanics 17: 725–735. 1984bPubMedCrossRefGoogle Scholar
  99. Kramer JC, Mendryk SW. Electrical stimulation as a strength improvement technique: a review. Journal of Orthopaedic and Sports Physical Therapy 4: 91–98, 1982PubMedGoogle Scholar
  100. Kroll W. Isometric cross-transfer effects under conditions of central facilitation. Journal of Applied Physiology 20: 297–300, 1965Google Scholar
  101. Krotkiewski M, Aniansson A, Grimby G, Björntorp P, Sjöstrom L. The effect of unilateral isokinetic strength training on local adipose and muscle tissue morphology, thickness, and enzymes. European Journal of Applied Physiology 42: 271–281, 1979CrossRefGoogle Scholar
  102. Lagasse PP. Muscle strength: ipsilateral and contralateral effects of superimposed stretch. Archives of Physical Medicine and Rehabilitation 55: 305–310, 1974PubMedGoogle Scholar
  103. Laughman RK, Youdas JW, Garrett TR, Chao EYS. Strength changes in the normal quadriceps femoris muscle as a result of electrical stimulation. Physical Therapy 63: 494–499, 1983PubMedGoogle Scholar
  104. Lewis SJ, Nygaard E, Sanchez J, Egeblad H, Saltin B. Static contraction of the quadriceps muscle in man: cardiovascular control and responses to one-legged strength training. Acta Physiologica Scandinavica 122: 341–353, 1984PubMedCrossRefGoogle Scholar
  105. Lexell J, Henriksson-Larsen K, Sjöstrom M. Distribution of different fibre types in human skeletal muscles. 2. A study of cross-sections of whole m. vastus lateralis. Acta Physiologica Scandinavica 117: 115–122, 1983PubMedCrossRefGoogle Scholar
  106. Loeb GE, Gans C. Electromyography for experimentalists, University of Chicago Press, Chicago, 1986Google Scholar
  107. Loeb GE, Pratt CA, Chanaud CM, Richmond FJR. Distribution and innervation of short, interdigitated muscle fibers in parallel-fibered muscles of the cat hindlimb. Journal of Morphology 191, 1–15, 1987PubMedCrossRefGoogle Scholar
  108. Loeb GE, Yee WJ, Pratt CA, Chanaud CM, Richmond FJR. Cross-correlation of EMG reveals widespread synchronizatlion of motor units during some slow movements in intact cats. Journal of Neuroscience Methods 21: 239–249, 1987PubMedCrossRefGoogle Scholar
  109. Lucas SM, Ruff RL, Binder MD. Specific tension measurements in single soleus and medial gastrocnemius muscle fibers of the cat. Experimental Neurology 95: 142–154, 1987PubMedCrossRefGoogle Scholar
  110. Luthi JM, Howald H, Ciaassen H, Rosler K, Vock P, et al. Structural changes in skeletal muscle tissue with heavy-resistance exercise. International Journal of Sports Medicine 7: 123–127, 1986PubMedCrossRefGoogle Scholar
  111. MacDougall JD. Morphological changes in human skeletal muscle following strength training and immobilization. In Jones et al. (Eds) Human muscle power and Human Kinetics Publishers, Inc., Champaign, 1986Google Scholar
  112. Magladery JW, McDougal DB. Electrophysiological studies of nerve and reflex activity in normal man. 1. Identification of certain reflexes in the electromyogram and the conduction velocity of peripheral nerve fibers. Bulletin of Johns Hopkins Hospital 86: 265–290, 1950Google Scholar
  113. Marsden CD, Meadows JC, Merton PA. ‘Muscular wisdom’ that minimizes fatigue during prolonged effort in man: peak rates of motoneuron discharge and slowing of discharge during fatigue. In J.E. Desmedt (Ed.) Motor control mechanisms in health and disease, Raven Press, New York, 1983Google Scholar
  114. Matoba H, Gollnick PD. Response ot skeletal muscle to training. Sports Medicine 1: 240–251, 1984PubMedCrossRefGoogle Scholar
  115. McCafferty WB, Horvath SM. Specificity of exercise and specificity of training: a subcellular review. Research Quarterly 48: 358–371, 1977PubMedGoogle Scholar
  116. McComas AJ, Fawcett PRW, Campbell MJ, Sica REP. Electrophysiological estimation of the number of motor units within a human muscle. Journal of Neurology, Neurosurgery, and Psychiatry 34: 121–131, 1971PubMedCrossRefGoogle Scholar
  117. McDonagh JC, Binder MD, Reinking RM, Stuart DG. Tetrapartite classification of motor units of cat tibialis posterior. Journal of Neurophysiology 44: 696–712, 1980aPubMedGoogle Scholar
  118. McDonagh JC, Binder MD, Reinking RM, Stuart DG. A commentary on muscle unit properties in cat hindlimb muscles. Journal of Morphology 166: 217–230, 1980bPubMedCrossRefGoogle Scholar
  119. McDonagh MJN, Davies CTM. Adaptive response of mammalian skeletal muscle to exercise with high loads. European Journal of Applied Physiology 52: 139–155, 1984CrossRefGoogle Scholar
  120. McDonagh MJN, Hayward CM Davies CTM. Isometric training in human elbow flexor muscles: the effects on voluntary and electrically evoked forces. Journal of Bone and Joint Surgery 65: 355–358, 1983PubMedGoogle Scholar
  121. Merton PA. Voluntary strength and fatigue. Journal of Physiology 123: 553–564, 1954PubMedGoogle Scholar
  122. Miller RG, Mirka A, Maxfield M. Rate of tension development in isometric contractions of a human hand muscle. Experimental Neurology 73: 267–285, 1981PubMedCrossRefGoogle Scholar
  123. Miller S, van der Meche FGA. Coordinated stepping of all four limbs in the high spinal cat. Brain Research 109: 395–398, 1976PubMedCrossRefGoogle Scholar
  124. Milner-Brown HS, Mellenthin M, Miller RG. Quantifying human muscle strength, endurance and fatigue. Archives of Physical Medicine and Rehabilitation 67: 530–535, 1986PubMedGoogle Scholar
  125. Milner-Brown HS, Stein RB, Lee RG. Synchronization of human motor units: possible roles of exercise and supraspinal reflexes. Electroencephalography and Clinical Neurophysiology 38: 245–254, 1975PubMedCrossRefGoogle Scholar
  126. Mohr T, Carlson B, Sulentic C, Landry R. Comparison of isometric exercise and high volt galvanic stimulation on quadriceps femoris muscle strength. Physical Therapy 65: 606–609, 1985PubMedGoogle Scholar
  127. Moore JC. Excitation overflow: an electromyographic investigation. Archives of Physical Medicine and Rehabilitation 56: 115–120, 1975PubMedGoogle Scholar
  128. Moreno-Aranda J, Seireg A. Electrical parameters for over-the-skin muscle stimulation. Journal of Biomechanics 14: 579–585, 1981aPubMedCrossRefGoogle Scholar
  129. Moreno-Aranda J, Seireg A. Investigation of over-the-skin electrical stimulation parameters for different normal muscles and subjects. Journal of Biomechanics 14: 587–593, 1981bPubMedCrossRefGoogle Scholar
  130. Moreno-Aranda J, Seireg A. Force response to electrical stimulation of canine skeletal muscles. Journal of Biomechanics 14: 595–599, 1981cPubMedCrossRefGoogle Scholar
  131. Moritani T, deVries HA. Neural factors versus hypertrophy in the time course of muscle strength gain. American Journal of Physical Medicine 58: 115–130, 1979PubMedGoogle Scholar
  132. Mortimer JT. Motor prostheses. In Brooks (Ed.) Handbook of physiology. Section 1: The nervous system, Vol. II: Motor control, Part 1, American Physiological Society, Bethesda, 1984Google Scholar
  133. Moulds RFW, Young A, Jones DA, Edwards RHT. A study of the contractility, biochemistry and morphology of an isolated preparation of human skeletal muscle. Clinical Science and Molecular Medicine 52: 291–297, 1977PubMedGoogle Scholar
  134. Ohtsuki T. Decrease in grip strength induced by simultaneous bilateral exertion with reference to finger strength. Ergonomics 24: 37–48, 1981PubMedCrossRefGoogle Scholar
  135. Ohtsuki T. Decrease in human voluntary isometric arm strength induced by simultaneous bilateral exertion. Behavioural Brain Research 7: 165–178, 1983PubMedCrossRefGoogle Scholar
  136. Panin N, Lindenauer HJ, Weiss AA, Ebel A. Electromyographic evaluation of the ’cross exercise’ effect. Archives of Physical Medicine and Rehabilitation 42: 47–53, 1961PubMedGoogle Scholar
  137. Parker RH. The effects of mild one-legged isometric or dynamic training. European Journal of Applied Physiology 54: 262–268, 1985CrossRefGoogle Scholar
  138. Perl ER. Crossed reflexes of cutaneous origin. American Journal of Physiology 188: 609–615, 1957PubMedGoogle Scholar
  139. Perry J, Bekey GA. EMG-force relationships in skeletal muscle. CRC Critical Reviews in Biomedical Engineering 9: 1–22, 1981Google Scholar
  140. Person RS, Kudina LP. Cross-correlation of electromyograms showing interference patterns. Electroencephalography and Clinical Neurophysiology 25: 58–68, 1968PubMedCrossRefGoogle Scholar
  141. Pette D. Activity-induced fast to slow transitions in mammalian muscle. Medicine and Science in Sports and Exercise 16: 517–528, 1984PubMedCrossRefGoogle Scholar
  142. Ralston HJ, Inman VT, Strait A, Shaffrath MD. Mechanics of human isolated voluntary muscle. American Journal of Physiology 151: 612–620, 1947PubMedGoogle Scholar
  143. Ranck JB. Which elements are excited in electrical stimulation of mammalian central nervous system: a review. Brain Research 98: 417–440, 1975PubMedCrossRefGoogle Scholar
  144. Rankin LL, Enoka RM, Volz KA, Stuart DG. Coexistence of twitch potentiation and tetanic force decline in rat Hindlimb muscle. Journal of Applied Physiology, In press, 1988Google Scholar
  145. Romero JA, Sanford TL, Schroeder RV, Fahey TD. The effects of electrical stimulation of normal quadriceps on strength and girth. Medicine and Science in Sports and Exercise 14: 194–197, 1982PubMedCrossRefGoogle Scholar
  146. Rosier K, Conley KE, Howald H, Gerber C, Hoppeler H. Specificity of leg power changes to velocities used in bicycle endurance training. Journal of Applied Physiology 61: 30–36, 1986Google Scholar
  147. Rotshenker S. Synapse formation in intact innervated cutaneous-pectoris muscles of the frog following denervation of opposite side. Journal of Physiology (London) 292: 535–547, 1979PubMedGoogle Scholar
  148. Rube N, Secher NH. Paradoxical Influence of encouragement on muscle fatigue. European Journal of Applied Physiology 46: 1–7, 1981CrossRefGoogle Scholar
  149. Rube N, Secher NH, Lodberg, F. The effect of habituation and training on two and one leg extension strength. Acta Physiologica Scandinavica 108: 8A, 1980Google Scholar
  150. Rutherford OM, Creig CA, Sargeant AJ, Jones DA. Strength training and power output: transference effects in the human quadriceps muscle. Journal of Sports Sciences 4: 101–107, 1986PubMedCrossRefGoogle Scholar
  151. Rutherford OM, Jones DA. The role of learning and coordination in strength training. European Journal of Applied Physiology 55: 100–105, 1986CrossRefGoogle Scholar
  152. Sale D, MacDougall D. Specificity in strength training: a review for the coach and athlete. Canadian Journal of Applied Sport Sciences 6: 87–92, 1981Google Scholar
  153. Sale D, MacDougall JD, Upton ARM, McComas AJ. Effect of strength training upon Motoneuron excitability in Man. Medicine and Science in Sports and Exercise 15: 57–62, 1983aPubMedCrossRefGoogle Scholar
  154. Sale D, McComas AJ, MacDougall JD, Upton ARM. Neuro-muscular adaptation in human thenar muscles following strength training and immobilization. Journal of Applied Physiology 53: 419–424, 1982PubMedGoogle Scholar
  155. Sales D, Upton ARM, McComas AJ, MacDougall JD. Neuro-muscular function in weight-trainers. Experimental Neurology 82: 521–531, 1983bCrossRefGoogle Scholar
  156. Salmons S, Henriksson J. The adaptive response of skeletal muscle to increased use. Muscle and Nerve 4: 94–105, 1981PubMedCrossRefGoogle Scholar
  157. Scripture EW, Smith TL, Brown EM. On the education of muscular control and power. Studies from the Yale Psychological Laboratory 2: 114–119, 1894Google Scholar
  158. Seals DR, Enoka RM. Sympathetic activation is associated with increases in EMG during fatiguing exercise. Medicine and Science in Sports and Exercise 20: S24, 1988Google Scholar
  159. Secher NH. Isometric rowing strength of experienced and inexperienced oarsmen. Medicine and Science in Sports 7: 280–283, 1975PubMedGoogle Scholar
  160. Secher NH, Rørsgaard S, Secher O. Contralateral influence on recruitment of curarized muscle fibres during maximal voluntary extension of the legs. Acta Physiologica Scandinavica 103: 456–462, 1978 riceps femoris muscle after training with electrical stimulation. Physical Therapy 65: 186–196, 1985PubMedCrossRefGoogle Scholar
  161. Shaffer LH. Rhythm and timing in skill. Psychological Review 89: 109–122, 1982PubMedCrossRefGoogle Scholar
  162. Sherrington CS. Reciprocal innervation of antagonistic muscles: fourteenth note — on double reciprocal Innervation. Proceedings of the Royal Society of London, Series B 81B: 249–268, 1909CrossRefGoogle Scholar
  163. Sills FD, Olson AL. Action potentials in unexercised arm when opposite arm is exercised. Research Quarterly 29: 213–221, 1958Google Scholar
  164. Smith LE. Facilitatory effects of Myotatic strength training upon leg strength and contralateral transfer. American Journal of Physical Medicine 49: 132–141, 1970PubMedGoogle Scholar
  165. Srihari T, Seedorf U, Pette D. Ipsi- and contralateral changes in rabbit soleus myosins by cross-reinnervation. Pflügers Archiv 390: 246–249, 1981PubMedCrossRefGoogle Scholar
  166. Staron RS, Pette D. Nonuniform myosin expression along single fibres of chronically stimulated and contralateral rabbit tibialis anterior muscles. Pflügers Archiv 409: 67–73, 1987PubMedCrossRefGoogle Scholar
  167. Stefanovska A, Vodovnik L. Change in muscle force following electrical stimulation. Scandinavian Journal of Rehabilitation Medicine 17: 141–146, 1985PubMedGoogle Scholar
  168. Stephens JA, Garnett R, Buller NP. Reversal of recruitment order of single motor units produced by cutaneous stimulation during voluntary muscle contraction in man. Nature 272: 362–364, 1978PubMedCrossRefGoogle Scholar
  169. Stuart DG, Binder MD, Enoka RM. Motor unit organization: application of the quadripartite classification Scheme to human muscles. In Dyck et al. (Eds) Peripheral neuropathy, WB Saunders, Philadelphia, 1984Google Scholar
  170. Stuart DG, Enoka RM. Motoneurons, motor units, and the size principle. In Rosenberg (Ed.) The clinical neurosciences, Section 5, Churchill Livingstone, New York, 1983Google Scholar
  171. Suominen H, Kiiskinen A, Heikkinen E. Effects of physical training on metabolism of connective tissues in young mice. Acta Physiologica Scandinavica 108: 17–22, 1980PubMedCrossRefGoogle Scholar
  172. Swynghedauw B. Development and functional adaptation of contractile proteins in cardiac and skeletal muscles. Physiological Reviews 66: 710–771, 1986PubMedGoogle Scholar
  173. Taylor A. The significance of grouping of motor unit activity. Journal of Physiology 162: 259–269, 1962PubMedGoogle Scholar
  174. Taylor NAS, Wilkinson JG. Exercise-induced skeletal muscle growth: hypertrophy or hyperplasia? Sports Medicine 3: 190–200, 1986PubMedCrossRefGoogle Scholar
  175. Thorstensson A, Karlsson J, Viitasalo JHT, Luhtanen P, Komi PV. Effect of strength training on EMG of human skeletal muscle. Acta Physiologica Scandinavica 98: 232–236, 1976PubMedCrossRefGoogle Scholar
  176. Tipton CM, Matthes RD, Maynard JA, Carey RA. The Influence of physical Activity on ligaments and tendons. Medicine and Science in Sports 7: 165–175, 1975PubMedGoogle Scholar
  177. Trimble MH. Effects of electrical stimulation on the recruitment order of motor units in man: indirect examination by electrically evoked muscle responses. Master’s thesis, University of Arizona, Tucson, 1987Google Scholar
  178. Valenčič V, Vodovnik L, Štefančič M, Jelnikar T. Improved motor response due to chronic electric stimulation of denervated tibialis anterior muscle in humans. Muscle and Nerve 9: 612–617, 1986PubMedCrossRefGoogle Scholar
  179. Vandervoort AA, Sale DG, Moroz J. Comparison of motor unit activation during unilateral and bilateral leg extension. Journal of Applied Physiology 56: 46–51, 1984PubMedGoogle Scholar
  180. Vandervoort AA, Sale DG, Moroz JR. Strength-velocity relationship and fatiguability of unilateral versus bilateral arm extension. European Journal of Applied Physiology 56: 201–205, 1987CrossRefGoogle Scholar
  181. Vodovnik L, Long C, Regenos E, Lippay A. Pain response to different tetanizing currents. Archives of Physical Medicine 46: 187–194, 1965Google Scholar
  182. Walsh JV, Burke RE, Rymer WZ, Tsairis P. Effect of compensatory hypertrophy studied in individual motor units in medial gastrocnemius muscle of the cat. Journal of Neurophysiology 41: 496–508, 1978PubMedGoogle Scholar
  183. Weytjens LJF, van Steenberghe D. The effects of Motor unit synchronization on the power spectrum of the electromyogram. Biological Cybernetics 51: 71–77, 1984PubMedCrossRefGoogle Scholar
  184. Wigerstad-Lossing I, Grimby G, Jonsson T, Morelli B, Peterson L, et al. Effects of electrical muscle stimulation combined with voluntary contractions after knee ligament surgery. Medicine and Science in Sports and Exercise 20: 93–98, 1988PubMedCrossRefGoogle Scholar
  185. Williams RA, Morrissey MC, Brewster CE. The effect of electrical stimulation on quadriceps strength and thigh circumference in menisectomy patients. Journal of Orthopaedic and Sports Physical Therapy 8: 143–146, 1986PubMedGoogle Scholar
  186. Wilson DL, Stone GC. Axoplasmic transport of proteins. Annual Review of Biophysics and Bioengineering 8: 27–45, 1979PubMedCrossRefGoogle Scholar
  187. Woo SL-Y, Gomez MA, Amiel D, Ritter MA, Gelberman RH, et al. The effects of exercise on the biomechanical and biochemical properties of swine digital flexor tendons. Journal of Biomechanical Engineering 103: 51–56, 1981PubMedCrossRefGoogle Scholar
  188. Woods JJ, Furbush F, Bigland-Ritchie B. Evidence for a fatigue-induced reflex inhibition of motoneuron firing rates. Journal of Neurophysiology 58: 125–137, 1987PubMedGoogle Scholar
  189. Yasuda Y, Miyamura M. Cross transfer effects of muscular training on blood flow in the ipsilateral and contralateral forearms. European Journal of Applied Physiology 51: 321–329, 1983CrossRefGoogle Scholar
  190. Young A, Stokes M, Round JM, Edwards RHT. The effect of high-resistance training on the strength and cross-sectional area of the human quadriceps. European Journal of Clinical Investigation 13: 411–417, 1983PubMedCrossRefGoogle Scholar
  191. Young K, McDonagh MJN, Davies CTM. The effects of two forms of isometric training on the mechanical properties of the triceps surae in Man. Pflügers Archiv 405: 384–388, 1985PubMedCrossRefGoogle Scholar

Copyright information

© ADIS Press Limited 1988

Authors and Affiliations

  • Roger M. Enoka
    • 1
  1. 1.Departments of Exercise & Sport Sciences and PhysiologyUniversity of ArizonaTucsonUSA

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