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Frontiers of Optoelectronics

Front. Optoelectron.    2015, Vol. 8 Issue (4) : 451-455     DOI: 10.1007/s12200-015-0532-9
Changes of muscle oxygenation and blood lactate concentration of swimming athletes during graded incremental exercise
Yuxiang WU1,Tao SONG1,Guodong XU1,2,*()
1. School of Physical Education, Jianghan University, Wuhan 430056, China
2. School of Health Sciences, Wuhan Institute of Physical Education, Wuhan 430079, China
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The sport performance of swimming athletes in three different levels including 5 national high-level swimming athletes, 5 ordinary swimming athletes and 5 college students was investigated by near-infrared spectroscopy (NIRS). Four parameters of muscle oxygenation and blood lactate (BLa) concentration were simultaneously monitored during incremental exercise on the ergometer. It was found that inflection points of muscle oxygenation and BLa concentration were consistent with the human sport capacity. Moreover, inflection points of muscle oxygenation occurred earlier than those of BLa concentration in ordinary athletes and college students. It implies monitoring changes of muscle oxygenation is superior to BLa measurement under this condition, since BLa test has an unavoidable time lag. Significant correlation (r2 = 0.948; P<0.05) was observed between inflection points of muscle oxygenation difference and inflection points of BLa concentration on workload. This relationship suggests changes of muscle oxygenation detected by NIRS is beneficial to the evaluation of athletes’ physiologic function and training load. Considering that muscle oxygenation could be in-vivo and non-invasively measured by NIRS, it may be a better indicator of exercise intensity than BLa measurement in the near future.

Keywords functional evaluation      muscle oxygenation      near-infrared spectroscopy (NIRS)      blood lactate (BLa)     
Corresponding Authors: Guodong XU   
Online First Date: 26 October 2015    Issue Date: 24 November 2015
 Cite this article:   
Yuxiang WU,Tao SONG,Guodong XU. Changes of muscle oxygenation and blood lactate concentration of swimming athletes during graded incremental exercise[J]. Front. Optoelectron., 2015, 8(4): 451-455.
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Yuxiang WU
Guodong XU

Schematic diagram of near infrared spectroscopy in layered tissue with muscle A/D represents analog to digital converter. A/D analog to digital converter


Changes of muscle oxygenation and BLa concentration in college students group during graded incremental exercise


Changes of muscle oxygenation and BLa concentration in ordinary-level athletes during graded incremental exercise


Changes of muscle oxygenation and BLa concentration in high-level athletes during graded incremental exercise


Notes: Groups A, B and C represent high-level, ordinary-level athletes and ordinary college students respectively. ATT, adipose tissue thickness


Subject characteristics, data are expressed as mean±standard deviation (SD)

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