Perceived exertion and blood lactate concentration during graded treadmill running |
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Authors: | Fred W. Kolkhorst Scott W. Mittelstadt Forrest A. Dolgener |
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Affiliation: | (1) Human Performance Laboratory, 20713 West Gymnasium, School of Health, Physical Education and Leisure Services, University of Northern Iowa, 50614-0241 Cedar Falls, IA, USA;(2) Development Pharmacology, Procter and Gamble Pharmaceuticals, 13815 Norwich, New York, USA |
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Abstract: | The purpose of this study was to investigate the influences of treadmill gradients on the rating of perceived exertion (RPE) at two fixed blood lactate concentrations ( [La–]b). Ten subjects performed three different incremental treadmill protocols by running either uphill (concentrically-biased), downhill (eccentrically-biased), or on the flat (non-biased). Individual data of each protocol were interpolated to reflect [La–]b corresponding to 2.0 and 4.0 mmol·l–1. At 2.0 mmol·l–1 [La–b, RPE and treadmill speed during downhill running were greater than during level running which was greater than during uphill running (p < 0.05) . Also, the downhill heart rate (HR) was greater than the uphill HR, and downhill minute ventilation () was greater than the level. Treadmill speed was the only measure at 4.0 mmol·l–1 [La–]b to differ between gradients. There was a moderate correlation of RPE with HR at both [La–]b (r = 0.73 at 2.0 mmol·l–1;r = 0.48 at 4.0 mmol·l–1) while treadmill speed was moderately correlated with RPE only at 2.0 mmol·l–1 [La–]b (r = 0.70). The results of this study demonstrated that the degree of eccentric-bias during running exercise is an influence of perceived exertion at a moderate but not at a high exercise intensity. |
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Keywords: | Concentric Eccentric Heart rate Muscle fibre type Ventilation |
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