...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Sports >The Three-Month Effects of a Ketogenic Diet on Body Composition, Blood Parameters, and Performance Metrics in CrossFit Trainees: A Pilot Study
【24h】

The Three-Month Effects of a Ketogenic Diet on Body Composition, Blood Parameters, and Performance Metrics in CrossFit Trainees: A Pilot Study

机译：生酮饮食对CrossFit学员的身体成分，血液参数和绩效指标的三个月影响：一项初步研究

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Adopting low carbohydrate, ketogenic diets remains a controversial issue for individuals who resistance train given that this form of dieting has been speculated to reduce skeletal muscle glycogen levels and stifle muscle anabolism. We sought to characterize the effects of a 12-week ketogenic diet (KD) on body composition, metabolic, and performance parameters in participants who trained recreationally at a local CrossFit facility. Twelve participants (nine males and three females, 31 ± 2 years of age, 80.3 ± 5.1 kg body mass, 22.9 ± 2.3% body fat, 1.37 back squat: body mass ratio) were divided into a control group (CTL; n = 5) and a KD group ( n = 7). KD participants were given dietary guidelines to follow over 12 weeks while CTL participants were instructed to continue their normal diet throughout the study, and all participants continued their CrossFit training routine for 12 weeks. Pre, 2.5-week, and 12-week anaerobic performance tests were conducted, and pre- and 12-week tests were performed for body composition using dual X-ray absorptiometry (DXA) and ultrasound, resting energy expenditure (REE), blood-serum health markers, and aerobic capacity. Additionally, blood beta hydroxybutyrate (BHB) levels were measured weekly. Blood BHB levels were 2.8- to 9.5-fold higher in KD versus CTL throughout confirming a state of nutritional ketosis. DXA fat mass decreased by 12.4% in KD ( p = 0.053). DXA total lean body mass changes were not different between groups, although DXA dual-leg lean mass decreased in the KD group by 1.4% ( p = 0.068), and vastus lateralis thickness values decreased in the KD group by ~8% ( p = 0.065). Changes in fasting glucose, HDL cholesterol, and triglycerides were similar between groups, although LDL cholesterol increased ~35% in KD ( p = 0.048). Between-group changes in REE, one-repetition maximum (1-RM) back squat, 400 m run times, and VO 2peak were similar between groups. While our n -sizes were limited, these preliminary data suggest that adopting a ketogenic diet causes marked reductions in whole-body adiposity while not impacting performance measures in recreationally-trained CrossFit trainees. Whether decrements in dual-leg muscle mass and vastus lateralis thickness in KD participants were due to fluid shifts remain unresolved, and increased LDL-C in these individuals warrants further investigation.
机译：对于低抵抗力的人来说，采用低碳水化合物的生酮饮食仍然是一个有争议的问题，因为这种饮食形式已经被认为可以减少骨骼肌糖原水平和窒息肌肉合成代谢。我们试图表征在当地CrossFit设施中进行休闲训练的参与者中，为期12周的生酮饮食（KD）对人体成分，代谢和性能参数的影响。将十二名参与者（9名男性和3名女性，31±2岁，80.3±5.1千克体重，22.9±2.3％体脂肪，1.37后深蹲：体重比）分为对照组（CTL; n = 5 ）和KD组（n = 7）。向KD参与者提供了在12周内遵循的饮食指南，而CTL参与者在整个研究过程中被要求继续正常饮食，并且所有参与者都继续进行CrossFit训练常规12周。进行了2.5周和12周的厌氧性能测试，并使用双X射线吸收法（DXA）和超声，静息能量消耗（REE），血清健康指标和有氧运动能力。此外，每周都要测量血液中的β-羟基丁酸（BHB）水平。整个KD的血BHB水平比CTL高2.8到9.5倍，这证实了营养性酮症的状态。 DXA脂肪质量在KD中下降了12.4％（p = 0.053）。尽管DXA双腿瘦体重在KD组中降低了1.4％（p = 0.068），而在KD组中外侧臀大肌厚度值降低了约8％（p = 0.065）。两组之间空腹血糖，HDL胆固醇和甘油三酸酯的变化相似，尽管KD中LDL胆固醇增加了约35％（p = 0.048）。两组之间的REE，最大重复（1-RM）后蹲，400 m运行时间和VO 2peak的变化相似。虽然我们的n值有限，但这些初步数据表明，采用生酮饮食会显着降低全身肥胖，而不会影响接受休闲训练的CrossFit受训者的绩效指标。 KD参与者的双腿肌肉质量减少和外侧阔肌厚度的减少是否是由于液体转移引起的，这一点尚待解决，这些人的LDL-C增加值得进一步研究。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号