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G Stratton M Jones KR Fox K Tolfrey J Harris N Maffulli 《Journal of sports sciences》2013,31(4):383-390
AbstractDespite the performance concerns of dehydration in other sports, there are currently no data on the effects of rapid weight-loss on the physical and cognitive performance of jockeys in a sport-specific context. In a randomised crossover design, eight Great Britain (GB) male licensed jockeys were assessed for chest strength, leg strength, simulated riding performance (assessed by maximum pushing frequency on a mechanical riding simulator during the final two furlongs of a simulated 2 mile race) and simple reaction time after performing 45 min of exercise, during which euhydration was maintained (Control trial) or induced 2% dehydration (Rapid Weight-Loss trial). Reductions in both chest (–13.8 ± 3.03% vs. 0.62 ± 1.04%) and leg strength (–4.8 ± 4.8% vs. –0.56 ± 2.5%) were greater in Rapid Weight-Loss compared with Control (P < 0.01 and P = 0.04, respectively). Similarly, reductions in simulated riding performance were also greater (P = 0.05) in Rapid Weight-Loss (–2.8 ± 4.0%) compared with Control (–0.07 ± 1.5%), whereas there were no significant changes (P = 0.14) in simple reaction time. We conclude that a 2% reduction in body mass, as achieved by 45 min of moderate-intensity exercise undertaken in a sweatsuit (a common method of inducing acute dehydration by jockeys), significantly impairs maximum pushing frequency during a simulated race. In addition, the observed reductions in strength may also increase the occupational hazards associated with race riding. 相似文献
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Smoking hygiene: an educational intervention to reduce respiratory symptoms in breastfeeding infants exposed to tobacco 
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下载免费PDF全文 The American Academy of Pediatrics recently removed nicotine from the category of drugs contraindicated during breastfeeding. Little evidence demonstrates that infants exposed to nicotine through breastfeeding experience increased health risks beyond the airborne risks associated with passive smoking. The purpose of this longitudinal, five-week, quasi-experimental pilot study was to determine whether "smoking hygiene," an educational intervention, reduces the frequency of respiratory symptoms experienced by infants whose mothers both smoke and breastfeed. Twenty-nine mother-infant pairs entered the study with 28% dropping out. Of the 21 mother-infant pairs who completed the study, 66% of the nine infants in the control group experienced respiratory illness, compared to 42% of the 12 infants in the intervention group (x2 = .814; p > .05). Thus, the difference was statistically nonsignificant in this small sample, but the trend worsened the anticipated direction. The study demonstrates some of the difficulties of intervening with this group of mothers. 相似文献
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Dari Green Tifanie Pulley Melinda Jackson Lori Latrice Martin Kenneth J. Fasching-Varner 《Gender and education》2018,30(3):295-309
The number of Black females enrolled in colleges and universities has grown in recent years, particularly at predominately white institutions (PWIs). Currently, research on the rise of Black females at PWIs is limited and fails to adequately address the emotional, social, and mental well-being of these students. Recent studies also largely ignore the critical roles that natural and formal Black female faculty play in serving as a buffer between Black female graduate students (BFGS) and PWIs more broadly. From a critical perspective using counter-narrative, we address the limitations of the scholarly literature on BFGS and other challenges faced by BFGS. We come to the disappointing – albeit unsurprising – conclusion that PWIs should do more to make the academy a welcoming place for BFGS, however, the ways in which PWIs function make support for BFGS unlikely. We conclude with a discussion about the implications of continued marginalisation of BFGS at PWIs for individuals, families, communities, disciplines, and for PWIs across the nation. 相似文献
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＂爱＂类同素词是韩语背景学习者常混淆的一类词,主要混淆原因并非目的语词的意义相近、相通,而是母语和目的语知识的双重影响,其中以拆识复合词的影响最为严重。这启示词语偏误研究今后应多关注同类偏误现象背后的复杂原因,力求客观、准确地找到具体偏误原因,以便更有针对性地进行教学。 相似文献
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