Chinese Journal of Tissue Engineering Research ›› 2019, Vol. 23 ›› Issue (20): 3176-3181.doi: 10.3969/j.issn.2095-4344.1160

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Influence of active and passive stretching on blood oxygen in ligament and muscle assessed using near-infrared spectroscopy  

Hu Tiantian1, 2, Wu Jinpeng3, Yue Ping3, Yang Qinlao2, Wang Jun1   

  1. 1School of Medicine, Shenzhen University, Shenzhen 518061, Guangdong Province, China; 2College of Optoelectronic Engineering, Shenzhen University, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen 518061, Guangdong Province, China; 3Institute of Biomedical Engineering, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 300192, China
  • Online:2019-07-18 Published:2019-07-18
  • Contact: Wang Jun, MD, Master’s supervisor, Associate professor, School of Medicine, Shenzhen University, Shenzhen 518061, Guangdong Province, China
  • About author:Hu Tiantian, MD, School of Medicine, Shenzhen University, Shenzhen 518061, Guangdong Province, China; College of Optoelectronic Engineering, Shenzhen University, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen 518061, Guangdong Province, China
  • Supported by:

    the Science and Technology Service Project of State Administration of Sport of China (to WJP)

Abstract:

BACKGROUND: There are many evaluation studies on the efficacy of different stretch methods such as static and dynamic stretches, but the objective index of modern scientific standards, especially physiological indicators are absent. Moreover, the underlying mechanism is not yet clear.

OBJECTIVE: To measure and verify the effects of static tensions (active and passive stretching) on the muscle blood flow and blood oxygen by using near-infrared spectroscopy, and to explore the mechanism of stretching from the aspect of physiological ischemia/reperfusion.
METHODS: Ten young healthy subjects (3 males and 7 females) with a mean age of (28±5) years were enrolled. NIRS Oximeter which integrated three-wavelength LED light sources was used to detect the blood oxygen in the muscle tissue under stretching and contraction under active stretching and passive stretching. The indicators included the oxyhemoglobin, deoxyhemoglobin, and total blood volume at baseline, during stretching and after intervention.
RESULTS AND CONCLUSION: (1) The blood oxyhemoglobin level of the muscles in stretched state was obviously increased with total blood volume increasing. The total blood volume, deoxyhemoglobin and oxyhemoglobin in contractile muscles were suppressed significantly and the increasing degree of blood indexes were less than that after the stretching exercise. (2) The increases of total blood volume and oxyhemoglobin after active stretching exercise were higher than those after passive stretching, which could promote blood microcirculation and hemodynamic activity, increase local blood oxygen and the flexibility of tissue, accelerate local tissue repair or enhance the tissue function. (3) These results indicate that near-infrared spectroscopy to detect tissue blood oxygen is expected to be an objective index for verifying tissue regeneration and rehabilitation.

Key words: near-infrared spectroscopy, static tensions, active tension, passive tension, blood flow, blood oxygen, oxygen consumption rate, physiological ischemia, tissue blood oxygen

CLC Number: