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Abstract
Excitability of primary hand motor cortex (PHMC), evaluated with transcranial magnetic stimulation by using the “1 mV resting motor threshold” method, and capillary blood lactate were measured at the end, as well as 5 and 10 min after a fatiguing hand-grip exercise. The relation between blood lactate and the amplitudes of motor-evoked potentials showed a significant direct proportionality. Blood lactate seems to exert a protective role on PHMC against fatigue reduction during extremely intensive isometric exercises.