Influence of Continuous and Interval Training on Oxygen Uptake On-Kinetics

BERGER, NICOLAS J. A.; TOLFREY, KEITH; WILLIAMS, ALUN G.; JONES, ANDREW M.

Medicine & Science in Sports & Exercise:
doi: 10.1249/01.mss.0000191418.37709.81
BASIC SCIENCES: Original Investigations
Abstract

Purpose: To examine the relative effectiveness of moderate-intensity continuous training and high-intensity interval training on pulmonary O2 uptake (V̇O2) kinetics at the onset of moderate- and severe-intensity cycle exercise in previously sedentary subjects.

Methods: Twenty-three healthy subjects (11 males; mean ± SD age 24 ± 5 yr; V̇O2peak 34.3 ± 5.5 mL·kg−1·min−1) were assigned to one of three groups: a continuous training group that completed three to four sessions per week of 30-min duration at 60% V̇O2peak (LO); an interval training group that completed three to four sessions per week involving 20 × 1-min exercise bouts at 90% V̇O2peak separated by 1-min rest periods (HI); or a control group (CON). Before and after the 6-wk intervention period, all subjects completed a series of step exercise tests to moderate and severe work rates during which pulmonary V̇O2 was measured breath-by-breath.

Results: ANOVA revealed that continuous and interval training were similarly effective in reducing the phase II V̇O2 time constant during moderate (LO: from 31 ± 8 to 23 ± 5 s; HI: from 32 ± 9 to 21 ± 4 s; both P < 0.05; CON: from 30 ± 6 to 29 ± 7 s; NSD) and severe exercise (LO: from 35 ± 6 to 24 ± 7 s; HI: from 32 ± 11 to 24 ± 7 s; both P < 0.05; CON: from 27 ± 7 to 25 ± 5 s; NSD) and in reducing the amplitude of the V̇O2 slow component (LO: from 0.38 ± 0.10 to 0.29 ± 0.09 L·min−1; HI: from 0.41 ± 0.28 to 0.30 ± 0.28 L·min−1; both P < 0.05; CON: from 0.54 ± 0.22 to 0.66 ± 0.38 L·min−1; NSD).

Conclusions: Six weeks of low-intensity continuous training and high-intensity interval training were similarly effective in enhancing V̇O2 on-kinetics following step transitions to moderate and severe exercise in previously untrained subjects.

Author Information

Department of Exercise and Sport Science, Manchester Metropolitan University, Hassall Road, Alsager, UNITED KINGDOM

Address for correspondence: Professor A. M. Jones, School of Sport and Health Sciences, University of Exeter, Exeter EX1 2LU, United Kingdom; E-mail: a.m.jones@exeter.ac.uk.

Submitted for publication March 2005.

Accepted for publication October 2005.

©2006The American College of Sports Medicine