The present study was designed to investigate the relationship between
volume and electrically evoked twitch properties of the quadriceps
muscle. Supramaximal single and doublet stimulation of the femoral nerve
was used to assess contractile properties at 45 degrees and 80 degrees
knee flexion. Muscle volume was measured using a 1.5-Tesla magnetic
resonance imaging scanner. Quadriceps muscle volume was only
significantly correlated (r = 0.629) with peak twitch torque induced by
doublet stimulation at 80 degrees but not at 45 degrees knee flexion.