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Validity of NIR spectroscopy for quantitatively measuring muscle oxidative metabolic rate in exercise

肌红蛋白 肌酸 化学 氧化磷酸化 内科学 氧化代谢 运动生理学 磷酸肌酸 无氧运动 代谢率 心率 内分泌学 新陈代谢 心脏病学 医学 能量代谢 生物化学 血压 物理疗法
作者
Takayuki Sako,Takafumi Hamaoka,Hiroyuki Higuchi,Yuko Kurosawa,Toshihito Katsumura
出处
期刊:Journal of Applied Physiology [American Physiological Society]
卷期号:90 (1): 338-344 被引量:129
标识
DOI:10.1152/jappl.2001.90.1.338
摘要

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 31 P-magnetic resonance spectroscopy (MRS) measurement as a standard measure. The resting muscle metabolic rate (RMRmus) was independently measured by 31 P-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 [V˙o 2NIR(30) ] was calculated from this ratio multiplied by RMRmus. During the second exercise bout, creatine phosphate (PCr) resynthesis rate was measured by 31 P-MRS at 30 s postexercise [Q (30) ] under the same conditions but without arterial occlusion postexercise. To determine the validity of NIRcws, V˙o 2NIR(30) was compared with Q (30) . There was a significant correlation betweenV˙o 2NIR(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.
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