Electrically evoked isokinetic plantar flexor torque in males.
The involuntary angle-specific isokinetic plantar flexor torques of seven male subjects aged 18-21 yr were measured using a Cybex II dynamometer (Lumex) modified by the addition of a strain-gauge load cell to improve the dynamic response of the instrument. Supramaximal electrical stimuli were used to evoke a maximal tetanic response from the triceps surae and ensure constant muscle activation at each angular velocity studied. Angle-specific torques were measured over a range (0.5-5.0 rad/s) of preset velocities, torque decreasing in a nonlinear manner with increasing angular velocity. The torque-velocity data was adequately described by an exponential equation of the form: V = a(e-1/b - e-Po/b) where V = velocity (rad/s), P = torque (N.m), Po = isometric torque (N.m), and a and b are constants. The mean intrasubject coefficient of variation of torque over the range of velocities studies was 7.9 +/- 1.88% (SD).
Thomas
D O
DO
Department of Physiology and Pharmacology, Queen's Medical Centre, Nottingham, United Kingdom.
White
M J
MJ
Sagar
G
G
Davies
C T
CT
D000328:Adult; D000843:Ankle Joint / Q000502:physiology; D001696:Biomechanical Phenomena; D004558:Electric Stimulation; D005528:Foot / Q000502:physiology; D006801:Humans; D007537:Isometric Contraction; D008297:Male; D009132:Muscles / Q000502:physiology*