IngentaConnect Moderate-domain pulmonary oxygen uptake kinetics and endurance ru...

Abstract:

The aims of this study were to determine if the primary time constant (τ) for oxygen uptake ( V˙ O 2 ) at the onset of moderate-intensity treadmill exercise is related to endurance running performance, and to establish if τ could be considered a determinant of endurance running performance. Thirty-six endurance trained male runners performed a series of laboratory tests, on separate days, to determine maximal oxygen uptake ( V˙ O 2max ), the ventilatory threshold (V T ) and running economy. In addition, runners completed six transitions from walking (4 km · h −1 ) to moderate-intensity running (80% V T ) for the determination of the V˙ O 2 primary time constant and mean response time. During all tests, pulmonary gas-exchange was measured breath-by-breath. Endurance running performance was determined using a treadmill 5-km time-trial, after which runners were considered as combined performers ( n =36) and, using a ranking system, high performers ( n =10) and low performers ( n =10). Relationships between τ and endurance running performance were quantified using correlation coefficients ( r ). Stepwise multiple regression was used to determine the primary predictor variables of endurance running performance in combined performers. Moderate correlations were observed between τ, mean response time and endurance running performance, but only for the combined performers ( r =−0.55, P =0.001 and r =−0.50, P =0.002, respectively). The regression model for predicting 5-km performance did not include τ or mean response time. The velocity at V˙ O 2max was strongly correlated to endurance running performance in all groups ( r =0.72 - 0.84, P

Keywords: Primary time constant; endurance; oxygen deficit; runners; 5 km

Document Type: Research article

DOI: 10.1080/02640410500457208

Affiliations: 1: Division of Sport and Recreation, Auckland University of Technology, Auckland, New Zealand 2: The Centre for Sport and Exercise Science, Sheffield Hallam University, Sheffield, UK

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Moderate-domain pulmonary oxygen uptake kinetics and endurance running performance