Gender Specific Responses of Overweight and Obese Adults to Sprint Interval Training on Anthropometric Variables

Overweight and Obesity is a growing health problem worldwide. Lifestyle changes such as decreased physical activity, increased sedentary behaviour and unhealthy eating habits has contribute to this problem. According to World Health Organization (2016), more than 1.9 billion adults aged 18 years and older were overweight (39% of men and 40% of women).Regular exercise is the key contributor to energy expenditure and is essential for energy balance and weight control. Interval training (IT) has been commonly used for decades with purpose to improve body health and reduce weight loss and this exercise differs from the conventional aerobic exercise and endurance exercise as IT typically involves repeated bouts of relatively intense exercise interspersed by periods of lower- intensity effort or complete rest for recovery. One of the most common type of IT is sprint interval training (SIT). SIT involves 'supramaximal' effort (>100% VO2max) work bouts, traditionally structured as four to six 30s all-out effort and each round separated by 4 minutes of recovery period of a low intensity exercise. Potential physiological adaptation of SIT are highlighted by various studies reporting cardiovascular, skeletal muscle adaptations, increase fat oxidation that facilitate increases in both aerobic and anaerobic performance. In addition, SIT is able to improve maximal rate of oxygen consumption (VO2max), at the same time improving the peripheral vascular structure and function, enzymes of fat metabolism and increases insulin sensitivity. Previous SIT studies have included young healthy men and women, healthy obese young women, all of which have shown that SIT is effective for fat loss and improvement of some health parameters. However, whether SIT protocol is equally effective in improving the anthropometric measures in men and women remain unknown.