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Articles in PresS, published online ahead of print November 27, 2002
J Appl Physiol, 10.1152/jap.00887.2001
Submitted on August 27, 2001
Accepted on November 19, 2002
1 Physical Medicine Department, Liege University Hospital, Liege, Belgium
2 NMR Laboratory, AFM and CEA, Institute of Myology, Pitie-Salpetriere University Hospital, Paris, France
* To whom correspondence should be addressed. E-mail: mvanderthommen{at}ulg.ac.be.
Skeletal muscle voluntary contractions (VC) and electrical stimulations (ES) were compared in eight healthy men. High-energy phosphates and myoglobin oxygenation were simultaneously monitored in the quadriceps by interleaved 1H- and 31P-NMRS. For the VC protocol, subjects performed 5 or 6 bouts of 5 min with a workload increment of 10% of maximal voluntary torque (MVT) at each step. The ES protocol consisted in a 13 min exercise with a load corresponding to 10% MVT. For both protocols, exercise consisted in 6-s isometric contraction/6-s rest cycles. For an identical mechanical level (10% MVT), ES induced larger changes than VC in Pi/PCr ratio [1.38 ± 1.14 (ES) vs 0.13 ± 0.04 (VC)], pH [6.69 ± 0.11 (ES) vs 7.04 ± 0.07 (VC)] and myoglobin desaturation [43 ± 15.9 (ES) vs 6.1 ± 4.6% (VC)]. Electrical stimulations activated the muscle facing the NMR coil to a greater extent than did voluntary contraction when evaluated under identical technical conditions. This metabolic pattern can be interpreted in terms of specific temporal and spatial muscle cell recruitment. Furthermore, at identical levels of energy charge, the muscle was more acidotic and cytoplasm appeared more oxygenated during ES than during VC. These results are in accordance with a preferential recruitment of type II fibers and a relative muscle hyperperfusion during ES.
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