![]() Participants were students attending two secondary schools in the city of Dahmani (Kef, Tunisia). The study was approved by the Scientific and Ethics Committee of High Institute of Sports and Physical Education of Kef and the protocol was conducted according to the Declaration of Helsinki. Twenty young males aged 17 to 20 years gave their written consent to participate in the study. The working hypothesis of the present study was that HIIT intervention is effective in improving body composition and lipid profile in the obese. The purpose of this study was to examine the effects of a HIIT programme on body composition, physical performance and plasma lipids in obese youth. So, further studies are needed to support the role of alternative evidence-based exercise recommendations. They more easily adhere to low-volume and more time-efficient high-intensity intermittent training. However, youth and especially those with weight excess have difficulty, and perhaps little interest, in practising long duration endurancebased activities. The use of HIIT interventions is often perceived as unpractical and intolerable by middle-aged and aged individuals. Accordingly, it was suggested that HIIT provides a useful alternative to traditional endurance-based exercise recommendations for health promotion. A body of evidence has demonstrated comparable or superior improvements in cardiometabolic fitness using HIIT in comparison to moderate endurance training. High-intensity interval training (HIIT) is a mode of exercise training that consist of 30 s all-out sprints separated by recovery intervals. Endurance exercise training demonstrated significant improvement in lipid profile in normal-weight active and sedentary and in obese individuals. Continuous training is considered beneficial for maintaining cardiovascular fitness. It promotes physical and mental health, thereby improving the quality of life. Physical activity is an efficient method for the prevention and treatment of obesity. It is associated with increased risk of cardiovascular diseases, type 2 diabetes mellitus, osteoarthritis, respiratory problems and cancer as well as reduced life expectancy. Obesity has been identified as a major health problem worldwide, especially in youth. Short duration HIIT may contribute to an improved cardiometabolic profile in the obese. The eight-week HIIT programme resulted in a slight improvement in physical fitness and a significant decrease in plasma lipids in the obese. Plasma total cholesterol (-11.8%, P=0.026, ES=0.96), LDL cholesterol (-11.9%, P=0.050, ES=0.77) and triglycerides (-21.3%, P=0.023, ES=1.08) significantly decreased in the obese group, but not in the normal-weight group. The HIIT programme resulted in significant reductions in body mass (-1.62%, P=0.016, ES=0.11) and fat mass (-1.59%, P=0.021, ES=0.23) in obese, but not in normal-weight subjects. Body composition, indices of aerobic and anaerobic performances, as well as fasting plasma lipids, were assessed in the two groups at PRE and POST HIIT. Nine overweight/obese and nine normal-weight men (control group) aged 17 to 20 years underwent a HIIT programme three times per week for eight weeks. To examine the effects of short high-intensity interval training (HIIT) on body composition, physical performance and plasma lipids in overweight/obese compared to normal-weight young men. ![]()
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