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J Appl Physiol 83: 262-269, 1997;
8750-7587/97 $5.00
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Journal of Applied Physiology
Vol. 83, No. 1, pp. 262-269, July 1997
METABOLISM

Anaerobic capacity and muscle activation during horizontal and uphill running

Mark A. Sloniger, Kirk J. Cureton, Barry M. Prior, and Ellen M. Evans

Department of Exercise Science, The University of Georgia, Athens, Georgia 30602-3654

Received 23 August 1996; accepted in final form 4 March 1997.

Sloniger, Mark A., Kirk J. Cureton, Barry M. Prior, and Ellen M. Evans. Anaerobic capacity and muscle activation during horizontal and uphill running. J. Appl. Physiol. 83(1): 262-269, 1997.---Anaerobic capacity as measured by the maximal or peak oxygen deficit is greater during uphill than during horizontal running. The objective of this study was to determine whether the greater peak oxygen deficit determined during uphill compared with horizontal running is related to greater muscle volume or mass activated in the lower extremity. The peak oxygen deficit in 12 subjects was determined during supramaximal treadmill running at 0 and 10% grade. Exercise-induced contrast shifts in magnetic resonance images were obtained before and after exercise and used to determine the percentage of muscle volume activated. The mean peak oxygen deficit determined for uphill running [2.96 ± 0.63 (SD) liters or 49 ± 6 ml/kg] was significantly greater (P < 0.05) than for horizontal running (2.45 ± 0.51 liters or 41 ± 7 ml/kg) by 21%. The mean percentage of muscle volume activated for uphill running [73.1 ± 7.4% (SD)] was significantly greater (P < 0.05) than for horizontal running (67.0 ± 8.3%) by 9%. The differences in peak oxygen deficit (liters) between uphill and horizontal running were significantly related (y = 8.05 × 10-4x + 0.35; r = 0.63, SE of estimate = 0.29 liter, P < 0.05) to the differences in the active muscle volume (cm3) in the lower extremity. We conclude that the higher peak oxygen deficit during uphill compared with horizontal running is due in part to increased mass of skeletal muscle activated in the lower extremity.

anaerobic metabolism; magnetic resonance imaging; skeletal muscle activation; oxygen deficit

0161-7567/97 $5.00 Copyright © 1997 the American Physiological Society




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