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Alterations in oxygen consumption during and between bouts of level and downhill running.
Med Sci Sports Exerc. 1994 Sep; 26(9):1144-52.MS

Abstract

Since the etiology of the drift in VO2 during downhill running is unclear, this study was designed to assess the contribution of heart rate (HR), ventilation (VE), blood lactate, rectal temperature (RT), muscle damage, and several variables that have not previously been included in VO2 drift research: muscle temperature (MT), and stride rate (SR) and length (SL), to the drift in VO2. Six subjects participated in a 45-min level run (LEVEL) and two 45-min downhill runs (DOWN1 and DOWN2) at 50% VO2max. Although VO2 increased significantly over time for all bouts, the magnitude [4.3% (LEVEL), 5.4% (DOWN1), and 8.1% (DOWN2)] did not differ between bouts (P > 0.05). VO2 was significantly lower during DOWN2 than during LEVEL and DOWN1 (P < 0.05). MT increased during the three bouts (P < 0.05) but the change over time was not different between bouts. SR and SL did not change over time within each bout nor between the two downhill runs. Muscle damage, as indicated by serum creatine kinase levels and perceived soreness, was less following LEVEL and DOWN2 than DOWN1 (P < 0.05). HR and RT increased over time (P < 0.05) but did not differ between bouts. VE and blood lactate did not differ over time or between bouts. VO2 drift during the three bouts paralleled changes in RT, MT, and HR but appears unrelated to muscle damage or biomechanical factors.

Authors+Show Affiliations

Department of Kinesiology, University of Colorado, Boulder 80309.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

7808249

Citation

Westerlind, K C., et al. "Alterations in Oxygen Consumption During and Between Bouts of Level and Downhill Running." Medicine and Science in Sports and Exercise, vol. 26, no. 9, 1994, pp. 1144-52.
Westerlind KC, Byrnes WC, Harris C, et al. Alterations in oxygen consumption during and between bouts of level and downhill running. Med Sci Sports Exerc. 1994;26(9):1144-52.
Westerlind, K. C., Byrnes, W. C., Harris, C., & Wilcox, A. R. (1994). Alterations in oxygen consumption during and between bouts of level and downhill running. Medicine and Science in Sports and Exercise, 26(9), 1144-52.
Westerlind KC, et al. Alterations in Oxygen Consumption During and Between Bouts of Level and Downhill Running. Med Sci Sports Exerc. 1994;26(9):1144-52. PubMed PMID: 7808249.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Alterations in oxygen consumption during and between bouts of level and downhill running. AU - Westerlind,K C, AU - Byrnes,W C, AU - Harris,C, AU - Wilcox,A R, PY - 1994/9/1/pubmed PY - 1994/9/1/medline PY - 1994/9/1/entrez SP - 1144 EP - 52 JF - Medicine and science in sports and exercise JO - Med Sci Sports Exerc VL - 26 IS - 9 N2 - Since the etiology of the drift in VO2 during downhill running is unclear, this study was designed to assess the contribution of heart rate (HR), ventilation (VE), blood lactate, rectal temperature (RT), muscle damage, and several variables that have not previously been included in VO2 drift research: muscle temperature (MT), and stride rate (SR) and length (SL), to the drift in VO2. Six subjects participated in a 45-min level run (LEVEL) and two 45-min downhill runs (DOWN1 and DOWN2) at 50% VO2max. Although VO2 increased significantly over time for all bouts, the magnitude [4.3% (LEVEL), 5.4% (DOWN1), and 8.1% (DOWN2)] did not differ between bouts (P > 0.05). VO2 was significantly lower during DOWN2 than during LEVEL and DOWN1 (P < 0.05). MT increased during the three bouts (P < 0.05) but the change over time was not different between bouts. SR and SL did not change over time within each bout nor between the two downhill runs. Muscle damage, as indicated by serum creatine kinase levels and perceived soreness, was less following LEVEL and DOWN2 than DOWN1 (P < 0.05). HR and RT increased over time (P < 0.05) but did not differ between bouts. VE and blood lactate did not differ over time or between bouts. VO2 drift during the three bouts paralleled changes in RT, MT, and HR but appears unrelated to muscle damage or biomechanical factors. SN - 0195-9131 UR - https://wwww.unboundmedicine.com/medline/citation/7808249/Alterations_in_oxygen_consumption_during_and_between_bouts_of_level_and_downhill_running_ DB - PRIME DP - Unbound Medicine ER -