Pattern of reflex responses in lower limb muscles to a resistance in walking man
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Reflex responses in the lower limbs were investigated using electromyographic and kinematic techniques in man walking on a treadmill. A momentary resistance was applied to one leg at three selected points in the step cycle. The responses to such stimuli, as well as the locomotor activity, were picked up electromyographically and displayed on a four channel oscilloscope. Four superficial muscles viz: gluteus medius, vastus lateralis, rectus femoris and tibialis anterior were studied in both ipsilateral and contralateral legs. In general it was found that the ipsilateral leg muscles produced a response throughout the step cycle regardless of whether the muscle was active or silent at the time the reflex occurred. In contrast, contralateral leg muscles showed a different pattern of response which depended on where the resistance was applied in the step cycle. The long reflex latency, of the order of 80 ms, was a consistant feature of the responses and suggests the possible involvement of supra-spinal pathways. The latencies for a particular muscle were identical on the ipsi- and contralateral sides. The durations of the swing and stance phases of the step cycle were also recorded but showed no change due to application of the resistance. In general, the results indicate that the body has the inherent ability to reinforce the ongoing locomotor muscle activity in response to external stimuli in order to maintain upright balanced walking.
Key wordsHuman locomotion EMG activity Long latency reflexes
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- Forssberg H (1979) Stumbling corrective reaction: A phase dependent compensatory reaction during locomotion. J Neurophysiol 42:937–953Google Scholar
- Garrett M, Atha J (1977) The role of the servo-loop in the control of quadriceps activation during the swing phase of walking in man. Ir J Med Sci 146:308Google Scholar
- Garrett M, Luckwill RG (1983) Role of reflex responses of knee musculature during the swing phase of walking in man. Eur J Appl Physiol 52:36–41Google Scholar
- Ghori GMU, Luckwill RG (1985) Responses of the lower limb to load carrying in walking man. Eur J Appl Physiol 54:145–150Google Scholar
- Graham-Brown T (1914) On the fundamental activity of the nervous centres, together with an analysis of the conditioning of rhythmic activity in progression, and a theory of the evolution of function in the nervous system. J Physiol (Lond) 48:18–46Google Scholar
- Graham-Brown T, Sherrington CS (1912) The rule of reflex response in the limb reflexes of the mammal and its exceptions. J Physiol (Lond) 44:125–130Google Scholar
- Johnston RC, Smidt GL (1969) Measurement of hip joint motion during walking. J Bone Joint Surg (Am) 51:1083–1094Google Scholar
- Luckwill RG, Murphy F (1982) Reflex response of upper limb muscles to lower limb disturbance in man during walking. Ir J Med Sci 151:398Google Scholar
- Meinck H-M, Piesiur-Strehlow B, Koehler W (1981) Some principles of flexor reflex generation in human leg muscles. Electroencephal Clin Neurophysiol 52:140–150Google Scholar
- Melvill Jones G, Watt DGD (1971) Observations on the control of stepping and hopping movements in man. J Physiol (Lond) 219:709–727Google Scholar