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Liu T.-H.,Taipei Physical Education College | Chang C.-K.,Sport science Research Center
Journal of Exercise Science and Fitness | Year: 2010

Supplementation of β-hydroxy-β-methylbutyrate (HMB) has been suggested to help increase muscle mass or reduce body fat in resistance-trained subjects and patients in catabolic states. The aim of this preliminary study was to investigate the effect of oral supplementation of 3 g·day-1 HMB for 3 days on body composition and exercise performance in well-trained female judo athletes during energy restriction. Eight female judo athletes were matched for body weight and divided into HMB and control groups. All subjects consumed food containing 20kcal·kg-1 with carbohydrate 3.6g·kg-1, protein 1.33g·kg-1, and fat 0.03g·kg-1 each day. Body weight and body fat percentage were significantly decreased in the HMB group, but remained unchanged in the control group after the study period. Muscle mass and the anaerobic performance of the lower and upper body were unchanged in both groups. The HMB group showed significant increases in total cholesterol, blood urea nitrogen, and uric acid after the study period. The control group did not show any significant changes in all blood parameters. This study suggested that short-term supplementation of HMB during energy restriction may help to reduce body fat but has no effect on lean body mass or exercise performance in female athletes. © 2010 Elsevier (Singapore) Pte Ltd. All rights reserved. Source


Hsieh L.-C.,Kaohsiung Municipal United Hospital | Chow C.-J.,National Kaohsiung Marine University | Chang W.-C.,Kaohsiung Municipal United Hospital | Liu T.-H.,Taipei Physical Education College | Chang C.-K.,Sport science Research Center
Asia Pacific Journal of Clinical Nutrition | Year: 2010

Malnutrition and muscle loss are common in bed-ridden elderly nursing home residents. Supplementation of β-hydroxy-β-methylbutyrate (HMB) has been shown to prevent muscle loss in several catabolic conditions. The aim of this study was to investigate the effect of HMB supplementation on body composition and protein metabolism in bed-ridden elderly nursing home residents receiving tube feeding. The subjects were randomly assigned to HMB (n=39, 2 g/d) or control group (n=40). Anthropometry measurements, blood sampling, and 24-hr urine collection were performed on the day before and 14 days after the start of the study. A subgroup of subjects (HMB: n=19, control: n=20) continued the study for another 14 days. Changes in body weight and BMI were not significantly different between the groups after 14 or 28 days after controlling for baseline BMI. Blood urea nitrogen significantly decreased in the HMB group, while it remained unchanged in the control group after 14 days. Urinary urea nitrogen excretion significantly decreased in the HMB group, while it showed a trend of increase in the control group after 14 and 28 days, respectively. Changes in blood urea nitrogen and urinary urea nitrogen excretion were significantly different between the groups after controlling for baseline BMI. This study suggested that HMB supplementation for 2-4 weeks could reduce muscle breakdown in bed-ridden elderly nursing home residents receiving tube feeding. Source


Chen C.-M.,National Chi Nan University | Chang C.-K.,Sport science Research Center | Yeh C.-Y.,National Chi Nan University
International Journal of Public Health | Year: 2012

Objective Previous studies on the relationship between sleep duration and bodymass index (BMI) have shown inconsistent results by using estimation strategies within the framework of ordinary least squares (OLS). This study examined the relationship between sleep duration and BMI by using quantile regression to account for the potential heterogeneous effect of sleep duration on BMI in different BMI categories. Methods The data of 2,392 adults were from the 2005 Panel Study of Family Dynamics in Taiwan. The dependent variable was BMI of the respondents. Both OLS and quantile regression models were used for comparison. Results The OLS model does not show significant relationship, while the quantile regression model shows a U-shaped relationship between sleep duration and BMI beyond the 90th percentile in men (BMI = 28.69) and an inverse U-shaped relationship at the 30th percentile of BMI in women (BMI = 21.37). Conclusions Quantile regression can provide information that may be masked by OLS in analyzing the relationship between sleep duration and BMI. Sleep modification with the aim to obtain the optimal sleep duration may help to reduce BMI in obese men. © Swiss School of Public Health 2011. Source


Hsieh K.-C.,Charder Electronic Co. | Lu H.-K.,Sport science Research Center | Chen C.-H.,Tunghai University
African Journal of Biotechnology | Year: 2011

The criterion validity of foot-to-foot (ZF-F) by bioelectrical impedance analysis (BIA) in a standing position measuring models was referenced by dual-energy X-ray absorptiometry (DEXA) and hand-tofoot (ZH-F). In order to cross match analysis, both of the ZH-F and ZF-F measuring by BIA were performed in the same event to the identical subject, simultaneously. 105 males (7 to 70 years old) and 108 females (7 to 67 years old) were measured by BIA and DEXA. The ZF-F value was 481.85 ± 63.37 ohm in male and 554.35 ± 74.97 ohm in female. The ZH-F value was 586.82 ± 81.56 ohm in male and 703.28 ± 97.70 ohm in female. Regression equations for ZF-F and ZH-F were ZF-F = 0.926 ZH-F - 63.093, (R = 0.85) in male and ZF-F = 0.909 ZH-F - 86.673 (R = 0.86) in female. The fat free mass (FFM), measured by DEXA was 49.42 ± 10.03 kg in male and 34.52 ± 4.45 kg in female. The correlation (R value) for ZF-F to DEXA was 0.93 and for ZH-F was 0.96 in male, and 0.85 and 0.87 in female, respectively. The high correlation between ZH-F and ZF-F vs. whole body DEXA in both male and female renders it applicable to develop the clinical instrument by foot-to-foot measuring models by BIA in standing position. © 2011 Academic Journals. Source


Ahmadizad S.,Shahid Beheshti University | Bassami M.,Sport science Research Center
Clinical Hemorheology and Microcirculation | Year: 2010

The purpose of this study was to investigate the effects of time of day on responses of the main determinants of blood rheology to acute endurance exercise. Ten healthy male subjects (age, 26.9±5.5 yr) performed two bouts of running at 65% of VO2peak for 45min on a motorised treadmill in the morning (08:00h) and evening (20:00h), which were followed by 30 min recovery. The two exercise trials were performed in two separate days with 7 days intervening. Haemorheological variables were measured before, immediately after exercise and after recovery. Haematocrit, haemoglobin and RBC count were increased significantly (p < 0.01) after 45min running in both morning and evening trials and normalised following recovery, irrespective of time of day. Plasma viscosity increased significantly (F2,18 = 12.4, p < 0.01) following sub-maximal exercise in both trials and returned to pre-exercise level at the end of recovery. Baseline values (p < 0.05) but not responses of plasma viscosity to exercise were significantly affected by time of day. Neither a significant main effect of exercise nor a significant (p > 0.05) time-of-day effect was found for plasma proteins. It was concluded that sub-maximal running at 08:00 or 20:00 h does not induce different responses in the main determinant of blood rheology. © 2010 - IOS Press and the authors. All rights reserved. Source

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