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The aim was to examine certain aspects of circulatory, metabolic, hormonal, thermoregulatory, cognitive, and perceptual responses while sitting following a brief session of high-intensity interval exercise. Twelve students (five men; age, 22 ± 2 years) performed two trials involving either simply sitting for 180 min (SIT) or sitting for this same period with a 6-min session of high-intensity exercise after 60 min (SIT+HIIT). At T 0  (after 30 min of resting), T 1  (after a 20-min breakfast), T 2  (after sitting for 1 h), T 3  (immediately after the HIIT), T 4 , T 5 , T 6 , and T 7  (30, 60, 90, and 120 min after the HIIT), circulatory, metabolic, hormonal, thermoregulatory, cognitive, and perceptual responses were assessed. The blood lactate concentration (at T 3 –T 5 ), heart rate (at T 3 –T 6 ), oxygen uptake (at T 3 –T 7 ), respiratory exchange ratio, and sensations of heat (T 3 –T 5 ), sweating (T 3 , T 4 ) and odor (T 3 ), as well as perception of vigor (T 3 –T 6 ), were higher and the respiratory exchange ratio (T 4 –T 7 ) and mean body and skin temperatures (T 3 ) lower in the SIT+HIIT than the SIT trial. Levels of blood glucose and salivary cortisol, cerebral oxygenation, and feelings of anxiety/depression, fatigue or hostility, as well as the variables of cognitive function assessed by the Stroop test did not differ between SIT and SIT+HIIT. In conclusion, interruption of prolonged sitting with a 6-min session of HIIT induced more pronounced circulatory and metabolic responses and improved certain aspects of perception, without affecting selected hormonal, thermoregulatory or cognitive functions.

Prolonged Sitting Interrupted by 6-Min of High-Intensity Exercise: Circulatory, Metabolic, Hormonal, Thermal, Cognitive, and Perceptual Responses