Effects of interval and continuous training on O-2 uptake kinetics during severe-intensity exercise initiated from an elevated metabolic baseline

Mariasole Da Boit, Stephen J. Bailey, Steven Callow, Fred J. DiMenna, Andrew M. Jones

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The purpose of this study was to test the hypothesis that VO2 kinetics would be speeded to a greater extent following repeated sprint training (RST), compared with continuous endurance training (ET), in the transition from moderate-to severe-intensity exercise. Twenty-three recreationally active subjects were randomly assigned to complete six sessions of ET (60-110 min of moderate-intensity cycling) or RST (four to seven 30-s all-out Wingate tests) over a 2-wk period. Subjects completed three identical work-to-work cycling exercise tests before and after the intervention period, consisting of baseline cycling at 20 W followed by sequential step increments to moderate-and severe-intensity work rates. The severe-intensity bout was continued to exhaustion on one occasion and was followed by a 60-s all-out sprint on another occasion. Phase II pulmonary VO2 kinetics were speeded by a similar magnitude in both the lower (ET pre, 28 +/- 4; ET post, 22 +/- 4 s; RST pre, 25 +/- 8; RST post, 20 +/- 7 s) and upper (ET pre, 50 +/- 10; ET post, 39 +/- 11 s; RST pre, 54 +/- 7; RST post, 40 +/- 11 s) steps of the work-to-work test following ET and RST (P = 0.05). The tolerable duration of exercise and the total amount of sprint work completed in the exercise performance test were also similarly enhanced by ET and RST (P = 0.05). Therefore, ET and RST provoked comparable improvements in VO2 kinetics and exercise performance in the transition from an elevated baseline work rate, with RST being a more time-efficient approach to elicit these adaptations.

Original languageEnglish
Pages (from-to)1068-1077
Number of pages10
JournalJournal of Applied Physiology
Volume116
Issue number8
DOIs
Publication statusPublished - 15 Apr 2014

Keywords

  • oxidative metabolism
  • muscle fatigue
  • muscle fiber recruitment
  • exercise tolerance
  • sprint performance
  • human skeletal-muscle
  • oxygen-uptake kinetics
  • uptake on-kinetics
  • glycogen depletion patterns
  • knee-extensor exercise
  • fiber types
  • slow-twitch
  • submaximal exercise
  • dynamic exercise
  • energy turnover

Cite this

Effects of interval and continuous training on O-2 uptake kinetics during severe-intensity exercise initiated from an elevated metabolic baseline. / Da Boit, Mariasole; Bailey, Stephen J.; Callow, Steven; DiMenna, Fred J.; Jones, Andrew M.

In: Journal of Applied Physiology, Vol. 116, No. 8, 15.04.2014, p. 1068-1077.

Research output: Contribution to journalArticle

Da Boit, Mariasole ; Bailey, Stephen J. ; Callow, Steven ; DiMenna, Fred J. ; Jones, Andrew M. / Effects of interval and continuous training on O-2 uptake kinetics during severe-intensity exercise initiated from an elevated metabolic baseline. In: Journal of Applied Physiology. 2014 ; Vol. 116, No. 8. pp. 1068-1077.
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AB - The purpose of this study was to test the hypothesis that VO2 kinetics would be speeded to a greater extent following repeated sprint training (RST), compared with continuous endurance training (ET), in the transition from moderate-to severe-intensity exercise. Twenty-three recreationally active subjects were randomly assigned to complete six sessions of ET (60-110 min of moderate-intensity cycling) or RST (four to seven 30-s all-out Wingate tests) over a 2-wk period. Subjects completed three identical work-to-work cycling exercise tests before and after the intervention period, consisting of baseline cycling at 20 W followed by sequential step increments to moderate-and severe-intensity work rates. The severe-intensity bout was continued to exhaustion on one occasion and was followed by a 60-s all-out sprint on another occasion. Phase II pulmonary VO2 kinetics were speeded by a similar magnitude in both the lower (ET pre, 28 +/- 4; ET post, 22 +/- 4 s; RST pre, 25 +/- 8; RST post, 20 +/- 7 s) and upper (ET pre, 50 +/- 10; ET post, 39 +/- 11 s; RST pre, 54 +/- 7; RST post, 40 +/- 11 s) steps of the work-to-work test following ET and RST (P = 0.05). The tolerable duration of exercise and the total amount of sprint work completed in the exercise performance test were also similarly enhanced by ET and RST (P = 0.05). Therefore, ET and RST provoked comparable improvements in VO2 kinetics and exercise performance in the transition from an elevated baseline work rate, with RST being a more time-efficient approach to elicit these adaptations.

KW - oxidative metabolism

KW - muscle fatigue

KW - muscle fiber recruitment

KW - exercise tolerance

KW - sprint performance

KW - human skeletal-muscle

KW - oxygen-uptake kinetics

KW - uptake on-kinetics

KW - glycogen depletion patterns

KW - knee-extensor exercise

KW - fiber types

KW - slow-twitch

KW - submaximal exercise

KW - dynamic exercise

KW - energy turnover

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DO - 10.1152/japplphysiol.01365.2013

M3 - Article

VL - 116

SP - 1068

EP - 1077

JO - Journal of Applied Physiology

JF - Journal of Applied Physiology

SN - 8750-7587

IS - 8

ER -