open access

https://hdl.handle.net/2115/84330

Muscle pump in the vastus lateralis in the supine position in light prolonged exercise

Muscle pump in prolonged exercise

英語

Supine position

2015-01

Edizioni Minerva Medica

The journal of sports medicine and physical fitness

55(1-2)

37-42

Aim. The purpose of this study was to examine whether the muscle pump in the supine position is attenuated during light prolonged exercise. Methods. After rest for 5 min, constant-load exercise with 50% of peak oxygen uptake (Vo2) determined by incremental exercises in the supine position was performed for 60 min with a pedaling rate of 60 rpm. Total hemoglobin and myoglobin (total Hb) in the vastus lateralis was determined by using a near-infrared spectroscopy (NIRS) system. The instrument was operating at 2 Hz. Vo2, heart rate (HR), mean blood pressure (MBP) and muscle deep temperature (Tm) were measured in the constant-load exercise. Results. After an increase at the onset of exercise, Vo2 showed a steady state, HR showed a significant gradual increase and MBP significantly decreased. After an increase until 20 min of exercise, Tm showed a steady state. Level of total Hb increased until 20 min and showed a steady state in all subjects. Average Tm was significantly related to average total Hb (r=0.978). Total Hb oscillated, but its oscillation occasionally disappeared. Peak amplitude of oscillation in total Hb for 30 sec after the start of exercise was significantly higher than that for 1 min before the end of exercise. Conclusion. The results suggest that the muscle pump operates in light exercise but is attenuated in the vastus lateralis in the supine position at the late phase of prolonged exercise.

学術雑誌論文

Accepted Manuscript

https://www.minervamedica.it/en/journals/sports-med-physical-fitness/article.php?cod=R40Y2015N01A0037

This is a postprint version of the article published in The journal of sports medicine and physical fitness. This version is free to view and download to private research and study only. Not for redistribution or re-use. ©Edizioni Minerva Medica. The final published article is available online on Minerva Medica website at https://www.minervamedica.it/en/journals/sports-med-physical-fitness/article.php?cod=R40Y2015N01A0037. Cite this article as Yano T., Lian C-S., Afroundeh R., Shirakawa K., Yunoki T.; Muscle pump in the vastus lateralis in the supine position in light prolonged exercise. J Sports Med Phys Fitness 2015 Jan-Feb;55(1-2):37-42.

0022-4707

1827-1928

AA00245411