![]() (2013) have used a training program similar to ours (30–30) for 12 weeks (2 sets of 6×30 sec at 100%–110% with a recovery interval of 30 sec at 50% MAV with 4 min of recovery between series), and found a significant reduction in body mass and WC (−3.58%) in obese adolescent females. Yet HIIT is today widely used as a time-efficient strategy for the management of body weight in overweight and obese patients ( Wewege et al., 2017), further evidence are still needed to clarify its real impact on body composition ( Alahmadi et al., 2014 Kong et al., 2016). Collectively these conflicting results clearly indicate the need for more researches questioning the effects of HIIT on body composition and metabolic health in youth with obesity.Īlthough the benefits of moderate intensity continuous physical activity on body composition are well documented ( Irving et al., 2008 Green et al., 2004), results remain unclear for HIIT, especially among obese youth ( Lambrick et al., 2016). By cons, other studies have shown that 8-week HIIT positively changes blood lipids in young men ( Musa et al., 2009 Ouerghi et al., 2017a Ouerghi et al., 2017b). (2012) reported that a 12-week HIIT program has no effect on insulin, glucose, homeostatic model assessment-insulin resistance, TC, LDL and HDL cholesterol, and TG in overweight young males. (2017) have demonstrated that long-term HIIT (≥12 weeks) significantly improved maximum oxygen uptake (VO 2max) and resting heart rate in overweight/obese populations, they missed to find any total cholesterol (TC), high-density lipoprotein (HDL) and low-density lipoprotein (LDL) cholesterol, and triglycerides (TG) changes. According to previous studies, HIIT improves plasma lipids in overweight and obese adults ( Alahmadi, 2014 Fisher et al., 2015 Koubaa et al., 2013), which remains unclear in adolescents and youth with obesity. (2013) found improved body composition in response to a 6-week HIIT intervention in obese adults. (2014) have reported that 12 weeks of HIIT has no meaningful effect on body fat (BF) levels in inactive overweight adults, Gillen et al. Most studies questioning the effect of HIIT programs on body composition remain however sometimes contradictory in youth. This method of training has led to a promising reduction of cardio-metabolic risk factors in adolescents, and thus became an interesting alternative approach to improve youth’s health ( Logan et al., 2014). Recently, high-intensity interval training (HIIT) has attracted attention as a time-efficient exercise option to improve cardiovascular and metabolic health ( Little and Francois, 2014). Physical training and especially aerobic training, is considered to be one of the angular stones for cardiovascular protection, but its effectiveness depends on numerous factors, such as age, sex, body composition, and nutrition, as well as training duration and intensity ( Ouerghi et al., 2014). Keywords: High-intensity interval training, Body composition, Lipid pro-file, Overweight, Obesity, Youth HIIT may be particularly useful in overweight/obese youth to improve body composition, aerobic fitness and lipid profile. ![]() Total cholesterol ( P<0.05) and TG ( P<0.05) decreased significantly in the HIIT group, while LDL and HDL cholesterol levels remained unchanged in both groups. MAV and VO2max were significantly improved in the HIIT group, only. Following 12 weeks of HIIT, WC, BMI ( P<0.01), and fat mass percent ( P<0.05) were significantly decreased. Aerobic capacity (MAV and maximum oxygen uptake ), body composition (body mass index, waist circumference, and fat mass percent) and lipid profile (triglycerides and total, high-density lipoprotein and low-density lipoprotein cholesterol) were determined before and after the HIIT program. The HIIT program consisted in 3 exercises sessions per week (30 sec of work at 100% maximal aerobic velocity ) interspersed by 30 sec of active recovery at 50% MAV, starting by 15 repetitions to reach 27 by the end of the program. ![]() ![]() Twenty healthy obese youth were randomly allocated into two groups experimental group (HIIT) and control group. This study was conducted to investigate the effect of a 12-week HIIT program without caloric restriction on body composition and lipid profile among young overweight/obese men. Although High-intensity interval training (HIIT) has shown its effectiveness in improving body composition, cardio-respiratory fitness and lipid profile in obese adults, evidences remain limited in overweight/obese youth.
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