Effect of Level and Downhill Running on Breathing EfficiencyReport as inadecuate




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Department of Sport & Exercise Sciences, University of Chichester, West Sussex PO19 6PE, UK





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Academic Editor: Arno Schmidt-Trucksäss

Abstract Ventilatory equivalents for oxygen and carbon dioxide are physiological measures of breathing efficiency, and are known to be affected by the intensity and mode of exercise. We examined the effect of level running gradient 0% and muscle-damaging downhill running −12%, matched for oxygen uptake, on the ventilatory equivalents for oxygen and carbon dioxide . Nine men 27 ± 9 years, 179 ± 7 cm, 75 ± 12 kg, : 52.0 ± 7.7 mL·kg−1·min−1 completed two 40-min running bouts 5 × 8-min with 2-min inter-bout rest, one level and one downhill. Running intensity was matched at 60% of maximal metabolic equivalent. Maximal isometric force of m.quadriceps femoris was measured before and after the running bouts. Data was analyzed with 2-way ANOVA or paired samples t-tests. Running speed downhill: 13.5 ± 3.2, level: 9.6 ± 2.2 km·h−1 and isometric force deficits downhill: 17.2 ± 7.6%, level: 2.0 ± 6.9% were higher for downhill running. Running bouts for level and downhill gradients had , heart rates and respiratory exchange ratio values that were not different indicating matched intensity and metabolic demands. During downhill running, the , downhill: 29.7 ± 3.3, level: 27.2 ± 1.6 and downhill: 33.3 ± 2.7, level: 30.4 ± 1.9 were 7.1% and 8.3% higher p < 0.05 than level running. In conclusion, breathing efficiency appears lower during downhill running i.e., muscle-damaging exercise compared to level running at a similar moderate intensity. View Full-Text

Keywords: eccentric exercise; muscle damage; ventilatory equivalent; metabolic equivalent; moderate intensity; treadmill running eccentric exercise; muscle damage; ventilatory equivalent; metabolic equivalent; moderate intensity; treadmill running





Author: Matthew D. Cook, Stephen D. Myers, John S. M. Kelly and Mark E. T. Willems *

Source: http://mdpi.com/



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