No abstract

No abstract

No abstract

No abstract

Liao, T, Li, L, and Wang, YT. Effects of functional strength training program on movement quality and fitness performance among girls aged 12–13 years. J Strength Cond Res 33(6): 1534–1541, 2019—The purpose of this study is to evaluate the effects of a 12-week intervention of functional strength training (FST) on movement quality and fitness performance among 12- to 13-year-old untrained girls. One hundred forty-four girls (age 12.47 ± 0.57 years) were randomly assigned to the FST group and traditional strength training (TST) group. The FST group underwent 10 functional movement corrective exercises in the first 6 weeks and 10 functional strength promotion exercises in the following 6 weeks, whereas the TST group did 10 TST exercises with progressive intensity in 12 weeks. The training was 3 times per week and 45 min per session for both groups. The subjects were tested at the beginning and at the end of the intervention on movement quality and fitness performance variables. To compare the 2 groups pretest vs. posttests, analysis of variance with mixed model analysis of variance, paired t-test and independent t-test, and 2 × 2 contingency chi-squared analysis were used. The main time-by-group interaction effect of the total score of Functional Movement Screen (FMS) showed FST group significantly better than TST group explicitly (p ≤ 0.05). Differences between groups were detected for individual components in FMS test, injury-related problem items of FMS, and fitness performance variables. Although TST group increased the muscular strength significantly (p ≤ 0.05), the FST group has significant improvements on more variables such as deep squat and trunk stability, muscular strength, flexibility, and power (p ≤ 0.05). In comparison with TST program, FST program may be more effective on the improvements of movement quality, muscular strength, flexibility, and power among untrained healthy girls aged 12–13 years, and may result in better health promotion and injury prevention as well.

No abstract

In this article, the feasibility of propidium iodide (PI) staining based on cell membrane damage as a sensitive and quantitative method to test the cytotoxicity of typical lipophilic compounds including 2,4,6-trichlorophenol (TCP) and perfluorooctane sulfonate (PFOS) was examined. The sensitivity of PI staining was compared to that of the methylthiazol-2-yl-2,5-diphenyl tetrazolium bromide (MTT) assay. We found a good correlation between PI uptake and increasing concentrations of TCP (10-50 μM) and PFOS (20-50 μM) at lower concentrations than those between growth inhibition ratio determined by the MTT assay and increasing concentrations of TCP (150-400 μM) and PFOS (100-500 μM). These findings indicated that the PI staining was more sensitive than the MTT assay. Furthermore, both the amount of PI uptake and the ratio of morphologically changed cells increased with increasing TCP concentrations, suggesting that PI staining may be a suitable quantitative substitute for the original method based on the observation of morphological changes in Vero cells. Our data also suggest that it is possible that the cell membrane damage that resulted in increased PI uptake may be due to variations in the phospholipid and protein content of the membrane, which are affected by interactions between the lipophilic compounds and components of the cell membrane.

Background:The aim of this study was to systematically determine the effects of rock climbing on College Students’ physical fitness by means of Meta-analysis.Methods:Studies investigated the possible fitness benefits of rock climbing were identified through a computerized search of six electronic databases: China National Knowledge Infrastructure, China Science Periodical Database, PubMed, Web of Science, SPORTDiscus and PsycINFO. Effects of rock climbing exercise intervention trials ≥4 wk, published in English and Chinese between Jan 1996 and May 2016, including between subject and within subject designs, were reviewed. Nine studies were included in this meta-analysis. Ten selected variables in this meta-analysis were: Body fat percentage, VO2max, Heart rate, Handgrip strength, Lower limb pedaling power, Vertical Jump, Push-Ups, Pull-Ups, Sit-Ups, and Sit-and-reach. The effect sizes of these ten variables were calculated (P<0.05) and forest plots along with effective sizes were presented.Results:Rock climbing can significantly improve Handgrip strength, Lower limb pedaling power, Vertical Jump, Push-Ups, Pull-Ups, Sit-Ups and Sit-and-reach (P<0.01), and significantly increase VO2max (P<0.05), however, rock climbing did not show significant improvement on Heart rate and Body fat percentage.Conclusion:As a newly popular physical exercise, rock climbing has a significantly positive impact on the physical fitness among college students. Rock climbing may be more effective if the college students engage in it for a longer term.