Force training induces changes in human muscle membrane properties.

Z'Graggen, Werner Josef; Trautmann, Joël Philippe; Bostock, Hugh (2016). Force training induces changes in human muscle membrane properties. Muscle & nerve, 54(1), pp. 144-146. John Wiley & Sons 10.1002/mus.25149

Text Z'Graggen_et_al-2016-Muscle_&_Nerve.pdf - Published Version Restricted to registered users only Available under License Publisher holds Copyright. Download (147kB)

INTRODUCTION

Human muscle membrane properties can be assessed in vivo by recording muscle velocity recovery cycles (MVRCs). This study was undertaken to study the effect of muscle force training on MVRC parameters.

METHODS

MVRCs with 1 to 5 conditioning stimuli were recorded from brachioradialis muscle before and after 2 weeks of muscle force training in 12 healthy subjects. The effects of training on relative refractory period and early and late supernormality were quantified.

RESULTS

Force training induced a reduction of relative refractory period (P < 0.0001), while early supernormality was increased (P < 0.02) and peaked earlier (P < 0.01). Late supernormality and the increases in late supernormality due to 2 and 5 conditioning stimuli remained unchanged.

CONCLUSIONS

Muscle force training leads to hyperpolarization of the resting muscle membrane potential, probably caused by an increase in the number of sodium pump sites. Muscle Nerve 54: 144-146, 2016.

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