ABSTRACT

　Weight loss maintenance is considerably more challenging than weight loss itself. Previous studies have investigated the effects of behavioral factors (i.e., physical activity, sedentary behavior, and sleep) on successful weight loss maintenance using subjective instruments (e.g., questionnaires) primarily among European ethnicities. This study aimed to explore objectively measured physical activity as well as sedentary and sleep behavior that could contribute to weight loss maintenance among Japanese adults. Eligible participants comprised adults who had undergone intentional weight loss of ≥10% of their initial body weight. They simultaneously wore tri-axial accelerometers on their waists and sleep monitors on their non-dominant wrists consecutively for two weeks to obtain various physical activities and sedentary and sleep variables. Associations between the degree of weight loss maintenance and activity, sedentary, and sleep variables were investigated using multiple linear regression analyses after allowing for potential confounding factors. The final sample for analysis comprised 25 adults (16 women) with a mean body mass index of 23.4 kg/m². The median value for the maintained weight loss rate([maximum weight - current weight]/maximum weight * 100) was 12.5%. Compared with those who maintained a weight loss of <12.5%, those who maintained a weight loss of <12.5% showed a tendency for a longer total sleep time (adjusted mean difference: 66.1min, 95% confidence interval: -14.0, 146.3, P=0.10). The remainders for the other behavioral variables did not differ between the two groups. In conclusion, compared with those with lower weight loss maintenance, those with greater weight loss maintenance tended to have a longer total sleep time. However, further studies are required with a larger sample size to allow for sufficient statistical adjustment.

DESCENTE SPORTS SCIENCE Vol.39/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE