Changes in oxygenation and phosphocreatine during exercise and recovery in relation to fiber types and capillary supply in human skeletal muscle

Takatumi Hamaoka; Masano Mizuno; Takuya Osada; Aivaras Ratkevicius; Alexander Norup Nielsen; Yoshinao Nakagawa; Toshihito Katsumura; Teruichi Shimomitsu; Bjorn Quistorff

doi:10.1117/12.301092

1 January 1998 Changes in oxygenation and phosphocreatine during exercise and recovery in relation to fiber types and capillary supply in human skeletal muscle

Takatumi Hamaoka, Masano Mizuno, Takuya Osada, Aivaras Ratkevicius, Alexander Norup Nielsen, Yoshinao Nakagawa, Toshihito Katsumura, Teruichi Shimomitsu, Bjorn Quistorff

Author Affiliations +

Proceedings Volume 3194, Photon Propagation in Tissues III; (1998) https://doi.org/10.1117/12.301092
Event: BiOS Europe '97, 1997, San Remo, Italy

Abstract

The purpose of this study was to examine the relationship between histochemical characteristics obtained from the gastrocnemius and changes in muscle energetics. Muscle oxygenation was determined by near infrared spectroscopy, and phosphocreatine (PCr) by 31-phosphorus magnetic resonance spectroscopy (³¹P-MRS) during a submaximal plantar flexion exercise and recovery. The relative occurrence (%) of slow-twitch fibers (ST), fast-twitch oxidative fibers (FTa), fast-twitch glycolytic fibers (FTb), and the number of capillaries per fiber (Cap/Fiber) were also determined. The sum of %ST and %FTa (%ST + %FTa) was 85.8 +/- 8.74% (mean +/- SD), while the number of Cap/Fiber was 2.52 +/- 0.63. The initial rate of deoxygenation (Rate_deoxy) at the beginning of the exercise was 2.43 +/- 0.95 %(DOT)sec^-1. The time constants (Tc) for the recovery of PCr and muscle oxygenation after exercise were 22.1 +/- 6.3 sec. and 20.3 +/- 13.6 sec., respectively. The %ST + FTa, and the number of Cap/Fiber were each positively correlated to the Rate_deoxy (P < 0.05). The %ST + %FTa, and the number of Cap/Fiber were negatively correlated to the Tc for PCr recovery (P < 0.05), but not correlated to that for muscle oxygenation recovery. In conclusion, the Rate_deoxy during localized submaximal exercise, and the Tc for PCr recovery are indicators of the muscle's oxidative capacity.

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Takatumi Hamaoka, Masano Mizuno, Takuya Osada, Aivaras Ratkevicius, Alexander Norup Nielsen, Yoshinao Nakagawa, Toshihito Katsumura, Teruichi Shimomitsu, and Bjorn Quistorff "Changes in oxygenation and phosphocreatine during exercise and recovery in relation to fiber types and capillary supply in human skeletal muscle", Proc. SPIE 3194, Photon Propagation in Tissues III, (1 January 1998); https://doi.org/10.1117/12.301092

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