Physiological determinants of endurance performance as studied in competitive racewalkers

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Abstract
Physiological factors that relate to 20-km performance were studied in 8 competitive racewalkers. The racewalking velocity at the blood lactate threshold (LT) during steady-state exercise was highly correlated to racewalking pace (r = 0.94) and predicted performance times to within 0.6%, which agrees with previous observations on runners. The 2 factors that contribute to velocity at LT are O2 uptake at LT (.ovrhdot.VO2 at LT) and submaximal racewalking economy (measured as the .ovrhdot.VO2 at a standard velocity). .ovrhdot.VO2 at LT was significantly correlated (r = 0.89) to performance in the racewalker in the present investigation, which agrees with previous observations of runners. Submaximal economy was significantly correlated to performance in the racewalkers (r = - 0.82). Maximal .ovrhdot.VO2 measured during racewalking was not significantly correlated (r = 0.62) to performance. Velocity at LT correlates closely to performance in racewalkers and the factor of submaximal economy, which partly determines velocity at LT, is related more to performance ability in racewalking than was previously observed in running.

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