- This Position Statement examines the evidence for physical activity in weight and adiposity loss, prevention of weight and adiposity gain, and in weight regain in adults, and provides guidance on implications for exercise practitioners. Research evidence indicates that >150 min but preferably 300 min per week of aerobic activity of at least moderate intensity is required to prevent weight and adiposity gain, and at least the upper end of this range of activity to prevent weight regain after weight loss.
- Despite evidence suggesting caution, employment of body mass index (BMI, kg m−2) as a proxy for percentage of body fat (PFat) in longitudinal studies of children and adolescents remains commonplace. Our objective was to test the validity of change in BMI as a proxy for change in PFat measured by dual-energy X-ray absorptiometry (DXA) during adolescence.
- Cardiorespiratory fitness (CRF) is measured as the highest rate of oxygen consumed ( V ˙ O2) during a bout of maximal exercise to voluntary exhaustion, described as V ˙ O2peak in children and youth.1 CRF provides an indication of the function of the cardiovascular and respiratory systems and it provides a strong summative measure of physical health among children and youth.2 Furthermore, youth with low CRF in late adolescence have an increased risk of developing cardiovascular disease in adulthood3 and succumbing to premature mortality.