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Effect of split exercise sessions on excess post-exercise oxygen consumption.

L A Kaminsky1, S Padjen, J LaHam-Saeger

  • 1Exercise Science and Cardiac Rehabilitation Program, Northeastern Illinois University, Chicago.

British Journal of Sports Medicine
|June 1, 1990
PubMed
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Splitting exercise into shorter sessions, like two 25-minute runs instead of one 50-minute run, significantly increases post-exercise caloric expenditure. This enhanced metabolic effect, known as excess post-exercise oxygen consumption (EPOC), is small but notable.

Area of Science:

  • Exercise Physiology
  • Metabolic Studies

Background:

  • Understanding the metabolic impact of different exercise durations is crucial for optimizing training.
  • Excess post-exercise oxygen consumption (EPOC) represents a significant component of total energy expenditure after exercise.

Purpose of the Study:

  • To compare the excess post-exercise oxygen consumption (EPOC) and related metabolic responses between a continuous 50-minute run and two intermittent 25-minute runs.
  • To investigate the impact of split exercise sessions on post-exercise caloric expenditure.

Main Methods:

  • Six women completed three exercise trials at 70% of peak VO2: one 50-minute run and two 25-minute runs separated by a rest period.
  • Open-circuit spirometry was used to measure oxygen consumption (VO2) and respiratory exchange ratio (RER).
  • Heart rate was monitored throughout the trials.

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Main Results:

  • VO2 returned to baseline within 30 minutes post-exercise for all trials.
  • The total caloric expenditure (EPOC) from two 25-minute runs was significantly higher (13.88 kcals) than from the continuous 50-minute run (6.39 kcals).
  • Heart rate and RER remained altered from baseline 30 minutes post-exercise.

Conclusions:

  • Split exercise sessions can lead to a significant increase in post-exercise caloric expenditure compared to continuous exercise of equivalent duration.
  • While the increase in caloric expenditure is statistically significant, its overall magnitude is relatively small.
  • These findings suggest that manipulating exercise timing may offer a modest benefit for energy expenditure.