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Related Experiment Videos

Circuit weight training and its effects on excess postexercise oxygen consumption.

R W Haltom1, R R Kraemer, R A Sloan

  • 1Southeastern Louisiana University, Department of Kinesiology and Health Studies, Hammond 70402, USA.

Medicine and Science in Sports and Exercise
|December 10, 1999
PubMed
Summary

Shorter rest intervals (20s) during circuit weight training (CWT) significantly increase excess postexercise oxygen consumption (EPOC) and net calorie expenditure during recovery. However, longer rest intervals (60s) result in slightly greater total caloric expenditure when exercise and recovery are combined.

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Area of Science:

  • Exercise Physiology
  • Metabolic Responses
  • Sports Science

Background:

  • Limited research exists on energy expenditure during and after circuit weight training (CWT).
  • Rest interval duration between sets influences metabolic responses to resistive exercise.

Purpose of the Study:

  • To investigate the effect of rest-interval duration on the magnitude of 1-hour excess postexercise oxygen consumption (EPOC) following CWT.

Main Methods:

  • Seven healthy men participated in randomized CWT sessions with either 20-second (20 RI) or 60-second (60 RI) rest intervals.
  • Each session involved two circuits of eight upper and lower body exercises, with 20 repetitions performed at 75% of the 20-repetition maximum.

Main Results:

  • The 1-hour EPOC was significantly higher following the 20 RI session (10.3 L) compared to the 60 RI session (7.40 L).

Related Experiment Videos

  • Net caloric expenditure during 1-hour recovery was significantly greater for the 20 RI session (51.51 kcal) versus the 60 RI session (37.00 kcal).
  • Total gross energy expenditure (exercise + 1-hour recovery) was greater for the 60 RI protocol (277.23 kcal) than the 20 RI protocol (242.21 kcal).

    • Conclusions:

    • Shortening rest intervals in CWT increases the magnitude of 1-hour EPOC.
    • Total caloric cost, considering both exercise and recovery, is slightly greater with longer rest intervals in CWT.
    • These findings suggest that total caloric cost should be considered when designing CWT protocols.