23 + 0.065 (W in kpm/min) two-leg MPF (kg) = 10.76 + 0.032 (W in kpm/min). Calculation from the force records of the work performed on the cranks (WCR net) showed good agreement (r = 0.98, P less than 0.001) with the work load set on the ergometer. Analysis of the proportion of work done in leg extension and flexion phases of cycling revealed no differences between one- and two-leg exercise or between the right and left legs. The majority (approximately 80%) of Wer net being performed in leg extension is described by: Wer net (extension)) = 10.6 +/- 0.8 (W cr net total). In one-leg exercise (W greater than 900 kpm/min) the variation in rotation speed during a normal cycle ranged from +20 to –30% of the mean speed compared with +/- 10% in two-leg exercise.
A cycle ergometer was designed by Anthony Sargeant to allow the forces generated by the legs on the cranks to be continuously monitored during cycling exercise. Strain gauges were bonded to the cranks and the output from these was taken through phoshor-bronze contacts mounted inside the cranks.
Journal of Applied Physiology
J Appl Physiol Respir Environ Exerc Physiol. 1977 Apr;42(4):514-8