An investigation by telementering of the activity of some muscles in walking

Apparatus is described for telementering electromyograph signals over a single frequency-modulated V.H.F. radio channel, also its use for measuring the periods of activity of leg muscles during normal walking on the flat. Results are given for eight male and six female subjects. Soleus contracts during the latter half of the support phase. Quadriceps contracts immediately prior to and during the first half of the support phase and again, in some subjects, as the opposite heel touches the ground. Hamstrings are active except during flexion of the knee during the swing phase. Flexors of the hip contract only at the end of hip flexion; some difference in timing between men and women was observed. The erector spinae on both sides contract twice per stride for a short period corresponding to heel contact of each limb. Inertial movements of the leg are stressed. Actions of the tibialis anterior, gluteus medius and maximus are also described.