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Department of Preventive Medicine and Public Health, Tokyo Medical University, Shinjuku-ku, Tokyo 160-8402, Japan
The purpose of this study
was to examine the validity of the quantitative measurement of muscle
oxidative metabolism in exercise by near-infrared continuous-wave
spectroscopy (NIRcws). Twelve male subjects performed two bouts of
dynamic handgrip exercise, once for the NIRcws measurement and once for
the 31P-magnetic resonance spectroscopy (MRS) measurement
as a standard measure. The resting muscle metabolic rate (RMRmus) was
independently measured by 31P-MRS during 15 min of arterial
occlusion at rest. During the first exercise bout, the quantitative
value of muscle oxidative metabolic rate at 30 s postexercise
was evaluated from the ratio of the rate of oxyhemoglobin/myoglobin
decline measured by NIRcws during arterial occlusion 30 s after
exercise and the rate at rest. Therefore, the absolute values of muscle
oxidative metabolic rate at 30 s after exercise
[
O2NIR(30)] was
calculated from this ratio multiplied by RMRmus. During the second
exercise bout, creatine phosphate (PCr) resynthesis rate was measured
by 31P-MRS at 30 s postexercise
[Q(30)] under the same conditions but without arterial occlusion postexercise. To determine the validity of
NIRcws, O2NIR(30) was
compared with Q(30). There was a significant correlation between
O2NIR(30), which ranged
between 0.018 and 0.187 mM ATP/s, and Q(30),
which ranged between 0.041 and 0.209 mM ATP/s (r = 0.965, P < 0.001). This result supports the
application of NIRcws to quantitatively evaluate muscle oxidative
metabolic rate in exercise.
near-infrared continuous wave spectroscopy; muscle metabolism; phosphorus-31-magnetic resonance spectroscopy
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