Komposisi Tubuh dan Kesegaran Kardiovaskuler yang Diukur dengan Harvard Step Test dan 20m Shuttle Run Test pada Anak Obesitas

Body composition and cardiovascular fitness measured by Harvard step test and 20m shuttle run test in obese childrenBackground: One of the impacts of obesity are physical and cardiovascular problems. Harvard step test and 20m shuttle run test can be used to measure cardiovascular fitness. Objective of this research is to determine the association between body composition with cardiovascular fitness in obese children measured by Harvard step test (HST) and 20m shuttle run test (SRT).Method: Cross sectional study was conducted to 31 students of Bernardus Elementary School Semarang in August 2010. Body composition (body mass index/BMI and fat percentage) was measured by Tanita BC545. Cardiovascular fitness was measured by HST and 20m SRT. During the step test Polar Vantage? Heart Rate (HR) monitor was attached to the subjects. Data were analyzed with Spearman correlation.Result: The average age was 10.7 (0.68) years. Only 17 children finished level III of Harvard test. The HR recovery never met the normal limit. There was no difference of physical fitness index (PFI) level I, II, and III (p=0.130) but the HR recovery decreased significantly (p=0.020). The mean of VO2max measured by 20m SRT was 20.5 (1.2) ml/kg/min, significantly lower compared with HST 24.2 (2.27) ml/kg/min. There were negative correlation between PFI and BMI (r=-0.381; p=0.034) and VO2max and BMI(r=-0.448; p=0.012).Conclusion: There are negative correlation between body mass index and cardiovascular fitness. However there are difference result of VO2max from Harvard step test comparing with 20m shuttle run test

Doping Dependence of Anisotropic Resistivities in Trilayered Superconductor Bi2Sr2Ca2Cu3O10+delta (Bi-2223)

The doping dependence of the themopower, in-plane resistivity rho_ab(T), out-of-plane resistivity rho_c(T), and susceptibility has been systematically measured for high-quality single crystal Bi2Sr2Ca2Cu3O10+delta. We found that the transition temperature Tc and pseudogap formation temperature T_rho_c*, below which rho_c shows a typical upturn, do not change from their optimum values in the "overdoped" region, even though doping actually proceeds. This suggests that, in overdoped region, the bulk $T_c$ is determined by the always underdoped inner plane, which have a large superconducting gap, while the carriers are mostly doped in the outer planes, which have a large phase stiffness.Comment: 5 pages, 4 figures. to be published in PR