Increase in median power frequency of the myoelectric signal in pathological fatigue.
During bicycle ergometry, surface EMG analysis was performed on the m. vastus lateralis in a patient with pathological fatigue (due to skeletal muscle carnitine deficiency). With prolonged, submaximal, exercise (30% VO2 max, 2 h) the median frequency of the power density spectrum increased, despite fatigue and lactate production. This observation questions the general validity of the present concepts on myoelectric aspects of fatigue.
Braakhekke
J P
JP
Institute of Neurology, University Hospital Nijmegen, The Netherlands.
Stegeman
D F
DF
Joosten
E M
EM
D000328:Adult; D001831:Body Temperature; D004576:Electromyography; D015444:Exercise; D005080:Exercise Test; D005221:Fatigue / Q000503:physiopathology*; D006801:Humans; D008297:Male; D009132:Muscles / Q000503:physiopathology*