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Knee extensor muscle oxygen consumption in relation to muscle activation

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Abstract

Recently, fatigability and muscle oxygen consumption (mVO2) during sustained isometric contractions were found to be less at shorter (30° knee angle; 0° = full extension) compared to longer knee extensor muscle lengths (90°) and, at low torques, less in the rectus femoris (RF) muscle than in the vastus lateralis and medialis. In the present study we hypothesized that these findings could be accounted for by a knee angle- and a muscle-dependent activation respectively. On two experimental days rectified surface EMG (rsEMG) was obtained as a measure of muscle activation in nine healthy young males. In addition, on day 1 maximal torque capacity (MTC) was carefully determined using superimposed nerve stimulation on brief high intensity contractions (> 70%MVC) at 30, 60 and 90° knee angles. On day 2, subjects performed longer lasting isometric contractions (10–70%MTC) while mVO2 was measured using near-infrared spectroscopy (NIRS). At 30°, maximal mVO2 was reached significantly later (11.0 s ± 6.5 s) and was 57.9 ± 8.3% less (average ± SD, across intensities and muscles) than mVO2 at 60 and 90° (p < 0.05). However, rsEMG was on average only 18.0 ± 11.8% (p = 0.062) less at the start of the contraction at 30°. At 10%MTC at all knee angles, maximal mVO2 of the RF occurred significantly later (28.8 ± 36.0 s) and showed a significantly smaller increase in rsEMG compared to both vasti. In conclusion, it is unlikely that the tendency for less intense muscle activation could fully account for the ∼60% lower oxygen consumption at 30°, but the later increase in RFmVO2 seemed to be caused by a less strong activation of the RF.

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Authors and Affiliations

  1. Institute for Fundamental and Clinical Human Movement Sciences, Vrije Universiteit, Van der Boechorststraat 9, 1081, BT, Amsterdam, The Netherlands

    R. D. Kooistra, M. E. Blaauboer, J. R. Born, C. J. de Ruiter & A. de Haan

  2. Institute for Biophysical and Clinical Research into Human Movement, Manchester Metropolitan University, Cheshire, UK

    A. de Haan

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  1. R. D. Kooistra
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  2. M. E. Blaauboer
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  3. J. R. Born
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  4. C. J. de Ruiter
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  5. A. de Haan
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Correspondence to R. D. Kooistra.

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Kooistra, R.D., Blaauboer, M.E., Born, J.R. et al. Knee extensor muscle oxygen consumption in relation to muscle activation. Eur J Appl Physiol 98, 535–545 (2006). https://doi.org/10.1007/s00421-006-0298-2

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