Kulling, B. A., Hardison, B. H., Jacobson, B. H., & Edwards, S. W. (1998). The effect of two different rest periods between sets in a resistance training program. Medicine and Science in Sports and Exercise, 30(5), Supplement abstract 939.

The effects of 30- and 90-second rest periods between sets on muscular strength and selected body mass indices were compared using both male and female (N = 55) college students as subjects. A no-activity control group was used for the 12-weeks period.

It was found that both training groups improved in strength and body mass indices but the shorter rest period group improved more in strength.

Implication. Rest periods of 30 seconds stimulate more strength development than 90 seconds.

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