Abstract
High-intensity interval training (HIIT) is considered a time-efficient exercise strategy for weight management. However, data regarding the acute appetite and energy intake responses to HIIT versus continuous training remain inconclusive. This study investigated the ad libitum energy intake and appetite responses to a single session of HIIT versus moderate-intensity continuous training (MICT) and vigorous-intensity continuous training (VICT). Using a randomized crossover design, 11 middle-aged physically inactive men (45.7 ± 7.4 years, 23.5 ± 2.1 kg m−2) participated in three treadmill trials at 7-day intervals. HIIT comprised 10 1-min periods at 100% VO2max interspersed with 1-min periods of active recovery. MICT comprised a 40-min session at 65% VO2max, while VICT comprised a 20-min session at 80% VO2max. After each trial, the participants consumed an ad libitum buffet meal for which the energy intake was recorded. The participants’ perceived appetite was assessed before and after exercise sessions using the Visual Analogue Scale (VAS). No significant differences in post-exercise ad libitum energy intake were observed between trials (HIIT: 645 ± 262.9 kcal; MICT: 614.7 ± 271.2 kcal; VICT: 623.1 ± 249.0 kcal, p > 0.05). Although the perceived appetite responses exhibited a significant main effect of time (p < 0.01), no group differences were observed (p > 0.05). In summary, these findings suggest that the interval or continuous nature of exercise has no significant effect on appetite responses in physically inactive middle-aged adults, at least during the short-term post-exercise period.
Highlights
Physical inactivity, which increases the risks of obesity and associated cardio-metabolic diseases, has been identified as a global pandemic [1]
No significant differences in post-exercise ad libitum energy intake and macronutrients were observed between the three trials (Table 2, all p > 0.05)
In the present theand most notable finding wasofthe lack of differences in the post-exercise response to an acute bout of. These findings suggest that short-duration libitum energy intakes and perceived appetites of physically inactive middle-aged adults in response vigorous exercise, of the interval or continuous nature,suggest yieldedthat similar appetite responses as to an acute bout ofregardless
Summary
Physical inactivity, which increases the risks of obesity and associated cardio-metabolic diseases, has been identified as a global pandemic [1]. Relevant previous studies focused mainly on continuous training for periods of 30–120 min and at intensities of 36–81% VO2max [3]. Nutrients 2018, 10, 1408 in the levels of circulating appetite-related hormones and/or metabolites and sensations of hunger and satiety [4]. These responses appear to depend on exercise intensity [5], as an increased intensity level was shown to promote appetite suppression [6]. Prolonged, continuous low-to-moderate exercise may not be practically feasible in some individuals who perceive a lack of time as a barrier to exercise [7]
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