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Proceedings Paper

Changes in oxygenation and phosphocreatine during exercise and recovery in relation to fiber types and capillary supply in human skeletal muscle
Author(s): Takatumi Hamaoka; Masano Mizuno; Takuya Osada; Aivaras Ratkevicius; Alexander Norup Nielsen; Yoshinao Nakagawa; Toshihito Katsumura; Teruichi Shimomitsu; Bjorn Quistorff
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Paper 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 (Ratedeoxy) 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 Ratedeoxy (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 Ratedeoxy during localized submaximal exercise, and the Tc for PCr recovery are indicators of the muscle's oxidative capacity.

Paper Details

Date Published: 1 January 1998
PDF: 7 pages
Proc. SPIE 3194, Photon Propagation in Tissues III, (1 January 1998); doi: 10.1117/12.301092
Show Author Affiliations
Takatumi Hamaoka, Tokyo Medical College (Japan)
Masano Mizuno, Univ. of Copenhagen (Denmark)
Takuya Osada, Tokyo Medical College (Japan)
Aivaras Ratkevicius, Univ. of Copenhagen (Denmark)
Alexander Norup Nielsen, Univ. of Copenhagen (Denmark)
Yoshinao Nakagawa, Univ. of Copenhagen (Denmark)
Toshihito Katsumura, Tokyo Medical College (Japan)
Teruichi Shimomitsu, Tokyo Medical College (Japan)
Bjorn Quistorff, Univ. of Copenhagen (Denmark)

Published in SPIE Proceedings Vol. 3194:
Photon Propagation in Tissues III
David A. Benaron M.D.; Britton Chance; Marco Ferrari, Editor(s)

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