reviewed five studies with exercise intensity described as all-out and concluded that it was an effective means of improving VO 2max. There is accumulating evidence supporting improved aerobic exercise performance following this form of training. Here, the repeated bouts of relatively brief all-out (maximal) intermittent exercise necessitate shorter interval durations and longer recovery periods than those of traditional high-intensity aerobic interval programming, and the total weekly volume (duration) of exercise is therefore lower. For example, Buchheit and Laursen recently defined HIT as “either repeated short (20–30 s, sprint interval session) all-out sprints, interspersed with recovery periods.” As such, maximal, all-out sprint training is classified as a form of high-intensity training at the highest end of the intensity spectrum. HIT can encompass a considerable range of exercise intensities. In contrast, HIT of similar intensity elicits improvements in maximal oxygen uptake ( VO 2max) slightly greater than is typically reported with continuous training in healthy, active adults. meta-analysed ten studies and reported that high-intensity aerobic interval training, typically performed at 85–95 % maximal heart rate (%HR max), increased cardiorespiratory fitness by almost double that of moderate-intensity continuous training in patients with lifestyle-induced chronic disease. In recent reviews, there appears to be a consensus for the benefit of high-intensity aerobic interval training in patient populations. Athletes and coaches have historically used HIT to improve exercise performance, but the effectiveness of HIT to improve health-related outcomes has recently generated new interest. High-intensity interval training (HIT), which involves alternating bouts of intensive exercise with low-intensity recovery periods, is considered one of the most effective means of improving cardiorespiratory and metabolic function.
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