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Is Walking Exercise a Protective Factor for Osteoporosis in Young Obese Women?

100%
Habibzadeh N., Rahmani-Nia F., Daneshmandi H.
Journal of Human Kinetics
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2010
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vol. 25
41-47
EN
Twenty obese (BMI>30) women with an average age of 22.00 ± 1.50 years volunteered to participate in this study. They were randomly assigned to exercise (n=10) and control (n=10) groups. Before and after the training program, both groups were evaluated for anthropometric measurements and blood analysis. Bone mass density (BMD) was evaluated by using dual-energy X-ray absorptiometry (DXA) at the hip and spine (L2- L4). Each walking session was 30 min walking at 50-75% of maximal heart rate, 3 days per week, for 2 months. After 2 months, the exercise group showed no significant effect on BMD at the spine (L2- L4) and hip (p>0.05). However, there was a slightly increase in BMD at both regions, while the control group did not. Also, no change was observed in bloods factors. Percent body fat, fat mass and lean mass changes in response to training were significant in the exercise group (all p=0.000). As a result, it may be suggested that walking programs of longer duration and higher intensity can influence BMD and related factors in obese girls, however to achieve this result, more studies are needed.
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Effect of caffeine on metabolic and cardiovascular responses to submaximal exercise in lean and obese men

88%
Damirchi A., Rahmani-Nia F., Mirzaie B., Hasan-Nia S., Ebrahimi M.
Biomedical Human Kinetics
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2009
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vol. 1
31-35
EN
Study aim: To compare the effects of caffeine on metabolic and cardiovascular responses to exercise in lean and obese subjects.Material and methods: In a double blind random design, 6 lean (BMI<20) and 6 obese (BMI>28) sedentary young men performed treadmill running for 30 min at similar exercise intensities (60% VO2max) one hour after caffeine (5 mg/kg body mass) or placebo ingestion. Gas exchange was measured by indirect calorimetry/open-circuit spirometry. Heart rate (HR) was measured throughout the exercise. Blood pressure (BP) measurements were taken at baseline, 1 h after caffeine/placebo ingestion and immediately after exercise. Repeated measures ANOVA was used in data analysis.Results: Caffeine significantly (p<0.05 - 0.01) increased the exercise-induced oxygen uptake, energy expenditure, systolic blood pressure and heart rate in both groups, the respiratory exchange ratio remaining unchanged. The effects of caffeine were in both groups alike.Conclusions: Caffeine activates metabolism without inducing major changes in fat/carbohydrate oxidation. The differences in body fat content seem not to affect the caffeine-induced effects in a submaximal exercise.
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