EMG spectral shift- and 31P-NMR-determined intracellular pH in fatigued human biceps brachii muscle.
We have simultaneously recorded human biceps brachii intracellular pH, estimated by 31P-NMR, and EMG spectral shift, during isometric contraction and recovery in six subjects. This method allows us to concurrently study several components of muscle fatigue. The results show a clear dissociation between the recovery of intracellular pH, force-generating capacity, and the shift to low frequency of the EMG power spectrum induced by fatiguing exercise.
Béliveau
L
L
INSERM U. 296, Faculté de Médecine de Créteil, France.
Helal
J N
JN
Gaillard
E
E
Van Hoecke
J
J
Atlan
G
G
Bouissou
P
P
D004576:Electromyography; D005221:Fatigue / Q000378:metabolism / Q000503:physiopathology*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007537:Isometric Contraction / Q000502:physiology; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D009132:Muscles / Q000378:metabolism / Q000502:physiology*; D010758:Phosphorus; D012016:Reference Values
D010758:Phosphorus