Abstract
The intent of this study was to investigate physiological recruitment strategies employed by the triceps surae (TS) muscles during sustained low-level activation. Surface-recorded electromyographic (EMG) signal data were recorded from the medial gastrocnemius (MG), lateral gastrocnemius (LG), and medial soleus (MS) muscles while eight subjects sustained static plantarflexion contractions at 10% of their maximum voluntary contraction (MVC) for 1 h. Fine-wire EMG activity was simultaneously recorded from electrodes located at three sites within the MG muscle. Correlation coefficients were computed among root mean square (RMS) amplitude values recorded from MG, LG, and MS to investigate between-synergist substitution, as well as between the three wire channels to investigate local substitution within the MG motor unit pool. Over the 1-h test, EMG amplitude in LG and MS increased linearly, and there was a moderately strong (R 2=0.662, P<0.023) positive correlation in the detrended activity between LG and MS, suggesting that these muscles generally acted together. When the data were divided into 5-min blocks, regression analysis on the partial correlation data revealed that MS and LG were correlated over the duration of the contraction (P<0.001) suggesting co-activation synergism, whereas MG and LG and MS and MG demonstrated a tendency toward trade-off synergism. In five of eight individuals at least one wire channel pair within the MG was negatively correlated, suggesting that there was some form of substitution between motor units or motor unit pools. The other three individuals maintained correlated activity between all three pairs throughout the 1-h contraction.
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Basmajian JV, DeLuca CJ (1985) Muscles alive. Williams and Wilkins, Baltimore
Bigland-Ritchie B, Bellemare F, Woods JJ (1983) Central and peripheral fatigue in intermittent submaximal contractions. Neurosci Abstr 9:631
Dieen JH van, Oude Vrielink HH, Housheer AF, Lotters FB, Toussaint HM (1993) Trunk extensor endurance and its relationship to electromyogram parameters. Eur J Appl Physiol 66:388–396
Edwards RHT (1983) Biochemical basis of fatigue in exercise performance: catastrophe theory of muscular fatigue. In: Knuttgen HG, Vogel JA, Poortmans J (eds) Biochemistry of exercise. Human Kinetics, Champaign, Ill., pp 3–28
Enoka RM, Stuart DG (1992) Neurobiology of muscle fatigue. J Appl Physiol 72:1631–1648
Ericson MO, Nissel R, Arborelius UP, Ekholm J (1985) Muscular activity during ergometer cycling. Scand J Rehabil Med 17:53–61
Fallentin N, Sidenius B, Jorgensen K (1985) Blood pressure, heart rate, and EMG in low-level contractions. Acta Physiol Scand 125:265–275
Fallentin N, Jorgensen K, Simonsen B (1993) Motor unit recruitment during prolonged isometric contractions. Eur J Appl Physiol 67:335–341
Jensen C, Westgaard RH (1997) Functional subdivision of the upper trapezius muscle during low-level activation. Eur J Appl Physiol 76:335–339
Johnson MA, Polgar J, Weightman D, Appleton D (1973) Data on the distribution of fiber types in thirty-six human muscles. J Neurol Sci 18:1–7
Jorgensen K, Fallentin N, Krogh-Lund C, Jensen B (1988) Electromyography and fatigue during sustained low-level static contractions. Eur J Appl Physiol 57:316–321
Jurell K (1998) Surface EMG and fatigue. Phys Med Rehabil Clin N Am 9:933–946
Kilbom A (1994) Repetitive work of the upper extremity: part II—the scientific basis (knowledge base) for the guide. Int J Ind Ergon 14:59–86
Krogh-Lund C (1993) Myoelectric fatigue and force failures from submaximal static elbow flexion sustained to exhaustion. Eur J Appl Physiol 67:389–401
Lindstrom L (1970) Technical Report 7:70. Chalmer’s Institute of Technology, Gothenburg, Sweden
Madeleine P, Lundager B, Voigt M, Arendt-Nielsen L (2003) The effects of neck-shoulder pain development on sensory-motor interactions among female workers in the poultry and fish industries. A prospective study. Int Arch Occup Environ Health 76:39–49
Mathiassen SE, Aminoff T (1997) Motor control and cardiovascular responses during isoelectric contractions of the upper trapezius muscle: evidence for individual adaptation strategies. Eur J Appl Physiol 76:434–444
Mathiassen SE, Winkel J (1990) Electromyographic activity in the shoulder-neck region according to arm position and glenohumeral tourque. Eur J Appl Physiol 61:370–379
Maton B, Gamet D (1989) The fatiguability of two antagonistic muscles in human isometric voluntary submaximal contraction: an EMG study II—motor unit firing rate and recruitment. Eur J Appl Physiol 58:369–374
McLean L (2003) Physchophysical and mechanical loading during computer works: do we all need frequent rest breaks? Proc Int Ergon Assoc, Seoul, August 24–28
McLean L, Scott RN, Rickards J (1997) Measurement of muscle fatigue in the cervical and lumbar regions during prolonged sitting. Proc 19th Annu Conf IEEE/EMBS
McLean L, Tingley M, Scott R.N, Rickards J (2000) Muscle electrophysiology measurement during prolonged computer terminal work. J Electromyogr Kinesiol 10:33–45
McLean L, Tingley M, Scott RN, Rickards J (2001) Muscle electrophysiology and the benefit of microbreaks during computer terminal work. J Appl Ergon 32:225–237
Oberg T, Sandsjo L, Kadefors R, Larsson SE (1992) Electromyographic changes in work-related myalgia of the trapezius muscle. Eur J Appl Physiol 65:221–257
Oberg T, Sandsjo L, Kadefors R (1994) Subjective and objective evaluation of shoulder muscle fatigue. Ergonomics 37:1323–1333
Parker PA, Korner L, Kadefors R (1984) Estimation of muscle force from intramuscular total pressure Med Biol Eng Comput 22:453–457
Person RS (1974) Rhythmic activity of a group of human motoneurons during voluntary contraction of a muscle. Electroencephalogr Clin Neurophysiol 36:585–595
Rohmert W (1960) Ermittung von Erholungs pausen fur statische Arbeit des Menschen. Int Angew Physiol 18:123. In: Bigland-Ritchie B, Woods JJ (1984) Changes in muscle contractile properties and neural control during human muscular fatigue. Muscle Nerve 7:691–699
Sale DG (1987) Influence of exercise and training on motor unit activation. In: Pandolf KB (ed) Exercise and sport science reviews, vol 15. MacMillan, London, pp 95–151
Sirin AV, Patla AE (1987) Myoelectric changes in the triceps surae muscles under sustained contractions—evidence for synergism. Eur J Appl Physiol 56:238–244
Sjogaard G, Kiens B, Jorgensen K, Saltin B (1986) Intramuscular pressure, EMG and blood flow during low-level prolonged static contraction in man. Acta Physiol Scand 128:475–484
Sluiter JK, Rest KM et al (2001) Criteria document for evaluating the work-relatedness of upper extremity musculoskeletal disorders. Scand J Work Environ Health 27 [Suppl 1]:1–102
Stokes MJ, Edwards RHT, Cooper RG (1989) Effect of low frequency fatigue on human muscle strength and fatigability during subsequent stimulated activity. Eur J Appl Physiol 59:278–283
Tamaki H, Kitada K, Akamine T, Sakou T, Kurata H (1997) Electromyogram patterns during plantar flexions at various angular velocities and knee angles in human triceps surae muscles. Eur J Appl Physiol 17:1–6
Tamaki H, Kitada K, Akamine T, Murata F, Sakou T, Kurata H (1998) Alternate activity in the synergistic muscles during prolonged low-level contractions. J Appl Physiol 84:1943–1951
Thorn S, Forsman M, Zhang Q, Taoda K (2002) Low threshold motor unit activity during a 1-h static contraction in the trapezius muscle. Int J Ind Ergon 30:225–236
Ulmer HV, Knieriemen W, Warlo T, Zech B (1989) Interindividual variability of isometric endurance with regard to the endurance performance limit for static work. Biomed Biochim Acta 48:S504–S508
Veiersted KB (1994) Sustained muscle tension as a risk factor for trapezius myalgia. Int J Ind Ergon 14:333–339
Veiersted KB, Westgaard RH (1993) Development of trapezius myalgia among female workers performing light manual work. Scand J Work Environ Health 19:277–283
Waersted M (2000) Human muscle activity related to non-biomechanical factors in the workplace. Eur J Appl Physiol 83:151–158
Westgaard RH, DeLuca CJ (1999) Motor unit substitution in long-duration contractions of the human trapezius muscle. J Neurophysiol 82:501–504
Windt DA van der, Thomas WME, et al (2000) Occupational risk factors for shoulder pain: a systematic review. Occup Environ Med 57:443–442
Winkel J, Wesdgaard R (1992) Occupational and individual risk factors for shoulder-neck complaints: part II—the scientific basis (literature review) for the guide. Int J Ind Ergon 10:85–104
Zennaro D, Laubli T, Krebs D, Klipstein A, Krueger H (2003) Continuous intermitted and sporadic motor unit activity in the trapezius muscle during prolonged computer work. J Electromyogr Kinesiol 13:113–124
Zipp P (1982) Recommendations for the standardization of lead positions in surface electromyography. Eur J Appl Physiol 50:41–54
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This project was evaluated and approved by a duly appointed Human Research Ethics Board according to the Tri-Council Policy Statement on Ethical Conduct for Research Involving Humans.
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McLean, L., Goudy, N. Neuromuscular response to sustained low-level muscle activation: within- and between-synergist substitution in the triceps surae muscles. Eur J Appl Physiol 91, 204–216 (2004). https://doi.org/10.1007/s00421-003-0967-3
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DOI: https://doi.org/10.1007/s00421-003-0967-3