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Changes in muscle oxygenation during weight-lifting exercise

T Tamaki¹, S Uchiyama, T Tamura

¹Department of Physiology, Tokai University School of Medicine, Kanagawa, Japan.

European Journal of Applied Physiology and Occupational Physiology

|January 1, 1994

Summary

Weight-lifting exercise, particularly bodybuilding routines, can induce prolonged muscle anoxia. Near-infrared spectroscopy reveals that intense, repetitive exercise with short rests impairs oxygenation in contracting muscles.

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Area of Science:

Exercise Physiology
Biomedical Optics

Background:

Muscle oxygenation dynamics during exercise are crucial for understanding performance and fatigue.
Noninvasive monitoring techniques are needed to assess physiological changes in real-time.

Purpose of the Study:

To quantitatively analyze haemoglobin oxygenation in human muscle during weight-lifting exercise.
To investigate the effects of high-load, high-repetition training on muscle oxygenation.

Main Methods:

Utilized a three-wavelength near-infrared spectroscopy (NIRS) method for noninvasive measurement.
Monitored changes in oxygenated haemoglobin (oxy-Hb), deoxygenated haemoglobin (deoxy-Hb), and total haemoglobin (total-Hb).
Subjects performed a ten repetition maximum (10 RM) one-arm curl exercise.

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Main Results:

Rapid increases in deoxy-Hb and decreases in oxy-Hb were observed at the onset of exercise.
Total-Hb increased gradually during exercise, indicating blood volume changes.
Muscle anoxic state and restricted venous blood flow were evident, persisting post-exercise.

Conclusions:

Weight-lifting protocols with high load, high repetitions, and short rest periods induce a prolonged anoxic state in muscles.
These findings have implications for training strategies in bodybuilding and sports requiring similar exertion.
NIRS is a valuable tool for assessing muscle oxygenation during dynamic exercise.