Hardcastle Takes a HIT! Commentary: Why Sprint Interval Training is Inappropriate for a Largely Sedentary population.

Our previous paper prompted a lively debate concerning the ĞĸcĂcy of sprint interval training (SIT) [1,2]. For clarification SIT refers to protocols that involve supramaximal efforts (>100% maximal oxygen uptake) and high-intensity-intervaltraining (HIIT) involves ‘vigorous’ or ‘near-maximal’ efforts (target intensity: 80% to 100% peak heart-rate) [3]. In the current commentary, we return to the role of affect and perceived effort on exercise adherence raised in the recent commentary by Jung et al. [4]. We contend that the considerable anticipated effort required to participate in SIT and aversive psychological states experienced during such 'all out' supramaximal exercise may likely to damage adherence to such protocols.


Sarah J Hardcastle and Eduardo Caldas Costa

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