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The aim of this study was to compare the acute responses to three time-matched exercise regimens. Ten trained adults (age, maximum oxygen consumption (VO 2max ), and body mass index (BMI) = 25.9 ± 5.6 yr, 50.9 ± 5.4 mL·kg -1 ·min -1 , and 22.1 ± 1.8 kg·m -2 ) completed sprint interval training (SIT) requiring 14 × 5 s efforts with 35 s of recovery, high-intensity interval training (HIIT) consisting of 18 × 15 s efforts at ~90% of peak heart rate (HR peak ) with 15 s of recovery, and vigorous continuous training (CT) consisting of 8.75 min at ~85 %HR peak , in randomized order. Heart rate, blood lactate concentration, rating of perceived exertion, affective valence, and enjoyment were monitored. Moreover, indices of neuromuscular function, autonomic balance, diet, mental stress, incidental physical activity (PA), and sleep were measured 24 h after each session to analyze the magnitude of recovery. Both HIIT and CT exhibited a greater %HR peak and time ≥ 90 %HR peak than SIT ( p &lt; 0.05). Blood lactate and rating of perceived exertion were higher in response to SIT and HIIT vs. CT ( p &lt; 0.05); however, there were no differences in enjoyment ( p &gt; 0.05). No differences were exhibited in any variable assessed along 24 h post-exercise between conditions ( p &gt; 0.05). These data suggest that HIIT and CT accumulate the longest duration at near maximal intensities, which is considered a key factor to enhance VO 2max .

Physiological and Psychological Responses to Three Distinct Exercise Training Regimens Performed in an Outdoor Setting: Acute and Delayed Response