Abstract
Objective: Aerobic exercises are the basic activity on fight against obesity. And obesity is related with metabolic rate. So our study is aimed to investigate the effects of 8 weeks aerobic exercise on basal metabolic rate and physical parameters. Methods: Sedentary women between the ages of 35 - 45 (n = 40) were randomized into control group (CG) (n = 20) and exercise group (EG) (n = 20). EG underwent 8 weeks of aerobic-run-walk exercise training: 3 days a week, 1 hour sessions. The CG was not trained. Basal metabolic rate (BMR), body mass index (BMI), waist-hip ratio (WHR), body fat percentage (BFP), body fat mass (FM) and lean body mass (LBM) were measured for all of the subjects before and after the training program. Results: Mean BMR decreased from 1386 ± 213.6 kcal to 1327 ± 253.7 in CG, and raised from 1308 ± 201.8 to 1409 ± 218.3 kcal in EG. While BMI raised from 31.39 ± 6.15 kg/m2 to 31.51 ± 6.09 kg/m2 in CG, it decreased from 29.62 ± 3.78 kg/m2 to 28.47 ± 3.74 kg/m2 in EG. There was also statistically significant difference in parameters of WHR, BFP, FM and LBM in favour of EG (p < 0.05). Conclusion: After 8 weeks aerobic exercise training program, there was a statistically significant difference in favour of EG in BMR, BMI, BFP, FM, LBM, WHR and weight parameters.
Highlights
The importance of exercise in daily life has increased due to developing technology and studies focusing on this subject
After randomisation of 40 healthy female volunteers into two groups; control group (n = 20) and exercise group (n = 20) Mann-Whitney U test was used for comparison of age, height, weight, waist-hip ratio (WHR), body mass index (BMI), body fat percentage (BFP), fat mass (FM), lean body mass (LBM) and Basal metabolic rate (BMR) between two groups before the intervention
Amano et al have reported that obese men and women who underwent aerobic exercise training for 30 minutes, three times a week, over 12 weeks had significant reduction in body weight, BMI, BFP, FM and LBM in their study [1]
Summary
The importance of exercise in daily life has increased due to developing technology and studies focusing on this subject. Activities of the brain, heart, kidneys and other organs constitute a significant portion of BMR, the main cause of differences between people are amount of skeletal muscles, the fat mass and body size [13]. The changes of body combine which occur in adulthood, so agerelated increase in fat mass and decrease in lean mass explains the decrement of 2% - 3% of BMR in adult men and women decennially [12]. There is no consensus regarding the long-term effects of regularly done physical activity on basal metabolism. This disagreement raises the necessity of new researches. The aim of this study is to examine the effect of 8-week aerobic exercise on basal metabolic rate and physical parameters in premenopausal sedentary women
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