Discussion
obesity, muscle mass
OBESITY
The significant decreases noted in FPG and 2-h PG following OGTT in both exercise intervention groups indicated that aerobic and resistance exercise could effectively control and reverse IGR (Tables The values of FPG, OGTT 2 h PG, GSP, HOMA2-IR, BMI, and waist circumference and their ratio of change (%)*The negative conversion ratio of blood glucose and the decrease ratio of GSP**This study also demonstrated the different effects caused by aerobic and resistance types of exercise intervention on IGR. The decrease in blood glucose levels was slightly higher in group A than in group R, but the results were not significantly different. This was probably because the increase in PA levels was higher in group A (24.44%) than in group R (1.59%); however, the findings were not affected significantly by daily physical activity other than the intervention, as shown in Table Referring to the effect of exercise intervention on IR, the results (Table Moreover, the relationship between exercise intervention effects and obesity was also investigated. Approximately three fourths (Table This sample size of the present study could support the main outcome, but the changes in the levels of GSP and body composition, as well as the relationship between different indicators, might not be adequately explained. Therefore, a larger sample size is required to indicate significant differences, and additional studies should be conducted to accurately define muscle mass and functional indicators so as to explore the relationship between IR and muscle mass and their function in the development of IGR. Certain variables, such as diet during the intervention, may affect the significance of the current results. In future studies, an improved control group is required to investigate these variables. Moreover, our study was conducted at a simple research center, resulting in some selection bias among the participants. A multicenter study may resolve this issue.