The bilateral limb deficit (BLD) phenomenon is the difference in maximal or near maximal force generating capacity of muscles when they are contracted alone or in combination with the contralateral muscles. A deficit occurs when the summed unilateral force is greater than the bilateral force. The BLD has been observed by a number of researchers in both upper and lower limbs, in isometric and in dynamic contractions. The underlying cause of the deficit remains unknown. One possible explanation is that the deficit occurs due to differences in antagonist muscle coactivation between unilateral and bilateral contractions. In order to examine this potential cause, this research examined torque and electromyography (EMG) during isometric bilateral and unilateral knee extension under three different joint angles (0°, 45°, and 90°) in a group of young, athletic males (n = 10, mean age of 24.5 ± 2.7 years, height = 180 ± 4.71 cm, and weight = 82.5 ± 17.8 kg). Torque and EMG data were collected from three superficial muscles of the quadriceps (vastus lateralis, vastus medialis, and rectus femoris) as well as two muscles of the antagonist hamstrings (biceps femoris and semitendinosus) during maximal isometric knee extensions. The BLD was only observed during the 45° contractions. Further examination of the data found that the antagonist muscle activity was similar during both bilateral and unilateral contractions suggesting that the deficit is not due to alterations in antagonist muscle patterns between unilateral and bilateral contractions.
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Archontides C, Fazey JA (1993) Inter-limb interactions and constraints in the expression of maximum force: a review, some implications and suggested underlying mechanisms. J Sports Sci 11:145–158
Farina D, Merletti R, Enoka R (2004) The extraction of neural strategies from the surface EMG. J Appl Physiol 96:1486–1495
Henry FM, Smith LE (1961) Simultaneous vs separate bilateral muscular contractions in relation to neural overflow theory and neuromotor specificity. Res Q Exerc Sport 32:42–46
Hernandez JP, Nelson-White NL, Franke WD, McLean SP (2003) Bilateral index expressions and iEMG activity in older versus younger adults. J Gerontol A Biol Sci Med Sci 58:M536–M541
Howard JD, Enoka RM (1991) Maximum bilateral contractions are modified by neurally mediated interlimb effects. J Appl Physiol 70:306–316
Jakobi J, Cafarelli E (1998) Neuromuscular drive and force production are not altered during bilateral contractions. J Appl Physiol 84:200–206
Jakobi J, Chilibeck P (2001) Bilateral and unilateral contractions: possible differences in maximal voluntary force. Can J Appl Physiol 26:12–33
Kawakami Y, Sale DG, MacDougall JD, Moroz JR (1998) Bilateral deficit in plantar flexion: relation to knee joint position, muscle activation, and reflex excitability. Eur J Appl Physiol 77:212–216
Koh T, Grabiner M, Clough C (1993) Bilateral deficit is larger for step than for ramp isometric contractions. J Appl Physiol 74:1200–1205
Kubo K, Tsunoda N, Kanehisa H, Fukunaga T (2004) Activation of agonist and antagonist muscles at different joint angles during maximal isometric efforts. Eur J Appl Physiol 91:349–352
Kuruganti U, Murphy T (2008) Bilateral deficit expressions and myoelectric signal activity during submaximal and maximal isometric knee extensions in young, athletic males. Eur J Appl Physiol 102:721–726
Lieber RL, Loren GJ, Fridén J (1994) In vivo measurement of human wrist extensor muscle sarcomere length changes. J Neurophysiol 71:874–881
McLean SP, Vint PF, Stember AJ (2006) Submaximal expression of the bilateral deficit. Res Q Exerc Sport 77:340–350
Oda S, Moritani T (1994) Maximal isometric force and neural activity during bilateral and unilateral elbow flexion in humans. Eur J Appl Physiol 69:240–243
Ohtsuki T (1981) Inhibition of individual fingers during grip strength exertion. Ergonomics 24:21–36
Ohtsuki T (1983) Decrease in human voluntary isometric arm strength induced by simultaneous bilateral exertion. Behav Brain Res 7:165–178
Ohtsuki T (1994) Changes in strength, speed and reaction time induced by simultaneous bilateral muscular activity. In: Swinnen SP, Heurer H, Massion J, Casaer P (eds) Interlimb coordination: neural dynamic and cognitive constraints. Academic Press, San Diego, pp 259–274
Owings T, Grabiner M (1998) Normally aging older adults demonstrate the bilateral deficit during ramp and hold contractions. J Gerontol A Biol Sci Med Sci 53A:B425–B429
Rube N, Secher NH (1990) Effect of training on central factors in fatigue following two-and one-leg static exercise in man. Acta Physiol Scand 141:87–95
Schantz PG, Moritanti T, Karlson E, Johansson E, Lundh A (1989) Maximal voluntary force of bilateral and unilateral leg extension. Acta Physiol Scand 136:185–192
Sexsmith JR, Woods BA (1997) Effects of knee angle and randomization on dynamic knee extension bilateral ratios. Med Sci Sports Exerc 29:S39
Steger J, Denoth J (1996) Das Bilaterale Defizit: analysen anhand von Kraft-,EMG-und EEG-Messungen. Schweizerische-Zeitschrift-fuer-Medizin-und-Tramatologie/Revue-suisse-pour-medecine-et-traumatologie-(Bern) 44:155–159
Van Soest AJ, Roebroeck ME, Bobbert JF, Huijing PA, Van Ingen Schenau GJ (1985) A comparison of one-legged and two-legged countermovement jumps. Med Sci Sports Exerc 17:635–639
Vandervoort AA, Sale DG, Moroz JR (1984) Comparison of motor unit activation during unilateral and bilateral leg extension. J Appl Physiol 56:46–51
Communicated by Fausto Baldissera.
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Kuruganti, U., Murphy, T. & Pardy, T. Bilateral deficit phenomenon and the role of antagonist muscle activity during maximal isometric knee extensions in young, athletic men. Eur J Appl Physiol 111, 1533–1539 (2011). https://doi.org/10.1007/s00421-010-1752-8
- Bilateral limb deficit
- Isometric knee extension
- Antagonist muscle