CORRELATION BETWEEN MUSCLE METABOLISM AND CHANGES IN M-WAVE AND SURFACE ELECTROMYOGRAM - DYNAMIC CONSTANT-LOAD LEG EXERCISE IN UNTRAINED SUBJECTS

In untrained subjects exercising on a cycle at constant work loads pre sented at a sub-or suprathreshold level, reduced M wave amplitude with lengthening of duration was measured in vastus lateralis muscle durin g and after suprathreshold exercise. M wave changes were correlated wi th increased blood lactate concentration. At the two work load levels, the increase in root mean square of EMG was rapidly closely adjusted to that of oxygen consumption, confirming the reality of adaptative re flex mechanisms in leg muscles during cycling. (C) 1997 John Wiley & S ons, Inc.