Muscle oxygenation during incremental arm and leg exercise in men and women |
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Authors: | Y Bhambhani R Maikala and S Buckley |
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Institution: | (1) Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, Canada T6G 2G4, CA |
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Abstract: | The purpose of this study was to compare the rates of muscle deoxygenation in the exercising muscles during incremental arm
cranking and leg cycling exercise in healthy men and women. Fifteen men and 10 women completed arm cranking and leg cycling
tests to exhaustion in separate sessions in a counterbalanced order. Cardiorespiratory measurements were monitored using an
automated metabolic cart interfaced with an electrocardiogram. Tissue absorbency was recorded continuously at 760 nm and 850 nm
during incremental exercise and 6 min of recovery, with a near infrared spectrometer interfaced with a computer. Muscle oxygenation
was calculated from the tissue absorbency measurements at 30%, 45%, 60%, 75% and 90% of peak oxygen uptake (V˙O2) during each exercise mode and is expressed as a percentage of the maximal range observed during exercise and recovery (%Mox).
Exponential regression analysis indicated significant inverse relationships (P < 0.01) between %Mox and absolute V˙O2 during arm cranking and leg cycling in men (multiple R = −0.96 and −0.99, respectively) and women (R =−0.94 and −0.99, respectively). No significant interaction was observed for the %Mox between the two exercise modes and
between the two genders. The rate of muscle deoxygenation per litre of V˙O2 was 31.1% and 26.4% during arm cranking and leg cycling, respectively, in men, and 26.3% and 37.4% respectively, in women.
It was concluded that the rate of decline in %Mox for a given increase in V˙O2 between 30% and 90% of the peak V˙O2 was independent of exercise mode and gender.
Accepted: 31 March 1998 |
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Keywords: | Oxygen uptake Near infrared spectroscopy Gender comparisons |
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