Near-infrared Spectroscopy Measurement Of Muscle Oxygenation Content And Its Application In Sports Practice

Introduction
To solve the problem of biomedical parameter in vivo, non-invasive and real-time during exercises, a three-wave-length
near-infrared spectroscopy(NIRS) based on diffusion theory of optics was designed[1] for measuring muscle
oxygenation content .The system was experimented and tested in various sports events with the purpose of introducing
new testing technology and index for monitoring and evaluating biology.

Method
Twenty healthy volunteers performed on an incremental intensity running protocol. The relative changes of skeletal
muscle oxygenation content were measured by NIRS, with which blood lactate acid concentration (BLa), ventilation
threshold (VT), heart rate (HR) and Vo2 were compared.

Result
In the experiment, the change in skeletal muscle oxygenation content of the volunteers was regular and has a significant
close relationship to BLa,Vo2, Vco2/ Vo2 and HR (the correlation coefficient of HbO2 and BLa is R=-0.896; HbO2 and
VO2 is R=0.958); meanwhile, Vco2/ Vo2 Plateau Duration was consistent with the content of HbO2 descended.

Discussion
The blood lactate concentration is closely related to the supply and consumption of O2
[2], which is transported by Hb. The
experimental result shows that the content of HbO2 in skeletal muscle tissues is descended with the increase of the intensity of
exercises, whereas BLa is ascended gradually. When at low intensity of exercises, Vo2 and Vco2 ascended simultaneously.
However, the ascending rate of Vco2 is obviously faster than that of Vo2 when the intensity is further heightened. This
phenomena is consistent with the characteristics of energy metabolism of human body..
Conclusion
This research shows that NIRS is a new biomedical photonics technology and measurable parameter for the evaluation
of athlete’s physique and training effect. It offers reference for monitoring and assessing training effect in vivo, realtime
and non-invasive.

References
[1]. Toshikazu Shiga. et al. (1997). Journal of Biomedical Optics 2(2) 154-161.
[2]. Murakami M. et al. (2000). J Biomed Opt. Oct;5(4):406-10.

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