Appell, C. J., Rozenek, R., Carrizi, M., Lacourse, M., & Russo, A. (2004). Comparison of 2:1 work to rest ratios of variable duration on responses to intermittent running. Medicine and Science in Sports and Exercise, 36(5), Supplement abstract 1407.

This investigation examined the effects of 2:1 work to rest ratios of variable duration on selected physiological responses during intermittent running. Trained male runners (N = 9) were tested at 100% of the velocity at VO2max (vVO2max) using the following protocols: a) 30-s work/15-s rest (30/15); b) 60-s work/30-s rest (60/30); c) 120-s work/60-s rest (120/60) and; d) a continuous run. Rest intervals were performed at 50% vVO2max. Heart rate, oxygen uptake, respiratory exchange ratio, blood lactate concentration, and rating of perceived exertion were measured.

No statistical differences were observed between the 30/15 and 60/15 conditions for mean or peak values. 120/60 produced significantly higher mean values compared to 30/15 for all measurements. The continuous run condition produced significantly higher values for mean and peak measurements compared to the other trials.

Implication. Responses to intermittent work consisting of 2:1 work to rest ratios will vary depending on the duration of work and rest. The effects are most pronounced with longer duration work:rest combinations.

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