Related Experiment Video
Updated: Mar 28, 2026

Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles
Published on: November 1, 2012
Relationship between muscle volume and contractile properties of the human knee extensors
Martin Behrens1, Niklas Brown2, Robert Bollinger2
1a Institute of Sport Science, University of Rostock, Ulmenstraße 69, 18057 Rostock, Germany.
Abstract:
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° and 80° 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° but not at 45° knee flexion.
Related Concept Videos
Isotonic and Isometric Muscle Contractions
Isotonic contractions
Isotonic contractions occur when a muscle changes length while...
Motor Unit Stimulation
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
Muscle Contraction
Muscle Contraction
Excitation-Contraction Coupling in Skeletal Muscles
When an action...
The Role of Actin and Myosin in Non-muscle Cells

