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Int J Sports Med 2008; 29(5): 379-383
DOI: 10.1055/s-2007-965567
Physiology & Biochemistry

© Georg Thieme Verlag KG Stuttgart · New York

Relationship between Muscle Oxygenation Kinetics and the Rate of Decline in Peak Torque during Isokinetic Knee Extension in Acute Hypoxia and Normoxia

Y. Kawahara1 , Y. Saito2 , K. Kashimura3 , I. Muraoka4
  • 1Graduate School of Human Sciences, Waseda University, Tokorozawa, Japan
  • 2Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan
  • 3Graduate School of Human Sciences, Waseda University, Tokorozawa, Japan
  • 4School of Sports Sciences, Waseda University, Tokorozawa, Japan
Further Information

Publication History

accepted after revision May 28, 2007

Publication Date:
18 September 2007 (online)

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Abstract

To investigate whether low FiO2 affects muscle oxygenation and the rate of decline in peak torque (DR) during isokinetic knee extension, subjects performed 50 isokinetic knee extensions at 180°/s and at 0.5 Hz while inhaling low O2 gas (12 %O2; H) or air (N). Muscle oxygenation kinetics was assessed by near-infrared spectroscopy, and whole-body V·O2 and HR were measured. We calculated total-, oxy- and deoxy-hemoglobin/myoglobin concentrations (TotalHb/Mb, OxyHb/Mb, DeoxyHb/Mb), and the slopes of the change in OxyHb/Mb during exercise. SpO2 decreased in H while DR and V·O2 did not differ between the conditions. During exercise, OxyHb/Mb was lower in H than in N, and DeoxyHb/Mb was higher in H than in N. TotalHb/Mb began to increase from the resting level earlier in H. HR was higher during the latter half of the exercise in H. The slopes of the change in OxyHb/Mb were the same in the two conditions. Our results show that low FiO2 decreases SpO2 and muscle oxygenation during maximal isokinetic knee extension. However, low SpO2 and muscle oxygenation did not affect the rates of decline of peak torque. These results suggest that the decline in peak torque occurs for reasons other than O2 availability.

Key words

near‐infrared spectroscopy - oxygenation - isokinetic knee extension - hypoxia

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Dr. Doctor Yayoi Kawahara

Waseda University
Graduate School of Human Sciences

2-26-7 Nishimagome, Ota-ku

143-0026 Tokyo

Japan

Email: Yayoi@kk.email.ne.jp