Influence of Exercise Intervention on Blood Lipid Levels, Glycometabolism, Adipocytokines, and Cardiac Autonomic Function in Adolescent Females with Hidden Obesity
【Supercategory：7. DESCENTE SPORTS SCIENCE Subcategory：7.25 Vol.25】
We performed exercise intervention for 12 weeks in adolescent females (22.3±2.5 yrs: mean±SD) with a %fat value of 30% or more (dual energy X-ray absorptiometry: DXA) despite a body mass index (BMI) of less than 25 kg/m², which indicates hidden obesity, and the following results were obtained.
The intensity of exercise was established as the double product break point calculated from heart rate and systolic blood pressure, and the subjects were instructed to exercise for 30 minutes or more per set 3 or more times a week. Six weeks after exercise intervention, the BMI, body fat level, and blood sugar level were lower than those before exercise intervention, and the %fat value was decreased 12 weeks after intervention. However, 12 weeks after intervention, there were no significant decreases in the BMI or body fat level in comparison to those 6 weeks after intervention, whereas the blood sugar level 12 weeks after intervention was significantly increased compared to that 6 weeks after intervention, being similar to the pre-intervention value. Furthermore, cardiac autonomic function (CAF) was negatively correlated with changes in High-frequency and changes in fat (kg), suggesting that exercise-related improvement in CAF is involved in a decrease in %fat.
Exercise performed in this study led to reduction of %fat without decreasing lean body mass. However, the results also suggest that our exercise program should be further improved, considering poor compliance 7 weeks or more after intervention.
DESCENTE SPORTS SCIENCE Vol.25/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
The intensity of exercise was established as the double product break point calculated from heart rate and systolic blood pressure, and the subjects were instructed to exercise for 30 minutes or more per set 3 or more times a week. Six weeks after exercise intervention, the BMI, body fat level, and blood sugar level were lower than those before exercise intervention, and the %fat value was decreased 12 weeks after intervention. However, 12 weeks after intervention, there were no significant decreases in the BMI or body fat level in comparison to those 6 weeks after intervention, whereas the blood sugar level 12 weeks after intervention was significantly increased compared to that 6 weeks after intervention, being similar to the pre-intervention value. Furthermore, cardiac autonomic function (CAF) was negatively correlated with changes in High-frequency and changes in fat (kg), suggesting that exercise-related improvement in CAF is involved in a decrease in %fat.
Exercise performed in this study led to reduction of %fat without decreasing lean body mass. However, the results also suggest that our exercise program should be further improved, considering poor compliance 7 weeks or more after intervention.
DESCENTE SPORTS SCIENCE Vol.25/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
| Researcher | Kojiro Ishii*1, Ichiro Sakuma*2, Noriko Kobayashi*2, Hiroaki Tanaka*3, Toshio Moritani*3 |
|---|---|
| University or institution | *1 Graduate School of Education, Hokkaido University, *2 Graduate School of Medicine, Hokkaido University, *3 Faculty of Sports and Health Science, Fukuoka University, *4 Graduate School of Human and Environmental Studies, Kyoto University |
Keywords
exercise intervention, body mass index(BMI), hidden obesity, double product break point, %fat value, cardiac autonomic function(CAF)