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KMID : 0386119920280050776
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Journal of the Korean Radiological Society
1992 Volume.28 No. 5 p.776 ~ p.782
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In vivo 31P NMR Spectroscopic Assessment of the Endurance and Recovery Capacity of Skeletal Muscle: Comparison between the Sedentaries and Canoe Athletes
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임태환
이대근/성기홍/문치웅/김상태/신명진
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Abstract
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In vivo 31P NMR spectroscopic study of forearm wrist flexor muscles was performed in two groups of volunteers composed respectively of 6 sedentaries and 6 canoe athletes. A continuous isometric contraction of endurance exercises was adopted in
oder
to
assess the endurance capacity and recovery potential of skeletal muscles. Differences in high energy phosphorus metabolism between the sedentaries and athletes were evaluated with and emphasis on the intracellular pH and Pi/PCr ratio as
indicators
of
high energy phosphorus metabolism. There were no differences of baseline pH and Pi/PCr ratio between the two groups. The athletes sustained the exercise at more acidic intracellular pH and at a higher Pi/PCr ratio of intracellular conditions for
an
all-out than did the sedentaries. The recovery rate of pH showed no difference between the two groups. There was a tendency of faster recovery of Pi/PCr in athletes showing half recovery time(T1/2) of 39.0±3.0 seconds as compared to that of
sedentaries
(55.7±7.5 seconds). The recovery rate of Pi/PCr as a function of Pi/PCr ratio at a given period of time was significantly faster in athletes than in sedentaries (P<0.001). The correlation coefficient of the recovery rate of Pi/PCr against the
Pi/PCr
ratio was 0.985 and 0.914 respectively for the athletes and sedentaries.
The pH and the Pi/PCR ratio at an all-out state can be used as indicators of endurance capacity and the recovery rate of Pi/PCr, as a reovery potential of skeletal muscles.
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KEYWORD
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