Development of a non-damaging high-intensity intermittent running protocol

The aim of the present study was to devise a non-damaging high-inten-sity intermittent running protocol. Ten healthy active men completed high-intensity interval running (8×3-min bouts at 90% of maximal oxy-gen uptake interspersed with 3-min recovery) on a motorized treadmill under normal laboratory temperatures. Mean heart rate and rating of perceived exertion significantly increased during the intermittent proto-col (the first bout, 15.3±1.2; the final bout, 18.6±0.9; P