The purpose of this study was to investigate whether eight weeks of aerobic high-intensity interval training with roller ski is effective in cross-country skiers. 10 male （age, 18.28 ± 2.1 years; height, 171.26 ...The purpose of this study was to investigate whether eight weeks of aerobic high-intensity interval training with roller ski is effective in cross-country skiers. 10 male （age, 18.28 ± 2.1 years; height, 171.26 ± 4.12 cm; weight 61.39 ± 6.28 kg） and 8 female （age, 16.05 ± 0.3 years; height, 158.3 ± 6.47 cm; weight, 49.34 ± 0.7 kg） junior cross country skiers completed the study. All skiers performed a 2 × 2-kin all-out uphill intervals with roller-skis, 3 times a week, in addition to their traditional training program. Measurements included VO2max （maximal oxygen uptake）, anaerobic power, and also for 2-km roller ski. All values were listed as pre-to post-test mean （± SD）, significant level, and percentage changes （%）. Pre-to post-testing changes in VO2max, anaerobic power, and also 2-kin roller ski performance were significantly higher during all post-test trials in all groups （P 〈 0.005）. With reference to the training effects found in our study, we suggest that the skiers should integrate the roller ski aerobic high-intensity interval uphill models in their training programs for improving performance.展开更多
The interaction of pulsed electromagnetic fields (PEMF) with the human body may result in a variety of positive outcomes including analgesia, enhanced healing, chondroprotection, cognitive improvement and better quali...The interaction of pulsed electromagnetic fields (PEMF) with the human body may result in a variety of positive outcomes including analgesia, enhanced healing, chondroprotection, cognitive improvement and better quality of life. Previous human studies have also revealed the potential of PEMF to enhance muscle function and athletic performance. To further evaluate this potential, an open label pilot study was conducted with 19 competitive cyclists who repeatedly participated in 63 training routes. Cyclist performance was tracked before and during use of a novel and portable PEMF device that is worn as a wristband. Comparison of performance before and during use of the wristband revealed a significant association with improved muscle power. The odds ratio was 3.02 (P < 0.01) for experiencing increased muscle power while wearing the PEMF device. Among the cycling routes in which an increase was observed, the average increase in power was about 9.8%. The data suggests the novel PEMF technology may be a safe and effective therapeutic approach for improved physical performance and likely involves improved oxygen delivery due to reduced rouleaux (erythrocyte aggregation). These results warrant further investigation comprising larger studies and additional outcomes.展开更多
目的:客观评价第三套全国中小学生系列广播体操的运动负荷。方法:在北京市朝阳区四所中小学中随机抽取120名学生作为受试者,每所学校30名,男女各半。受试学生分别完成第三套全国中小学生广播体操放飞理想、舞动青春、七彩阳光和希望风...目的:客观评价第三套全国中小学生系列广播体操的运动负荷。方法:在北京市朝阳区四所中小学中随机抽取120名学生作为受试者,每所学校30名,男女各半。受试学生分别完成第三套全国中小学生广播体操放飞理想、舞动青春、七彩阳光和希望风帆系列中的一套操。四套广播体操的平均运动时间是268.3±4.3秒。受试学生的检测包括2个步骤:(1)VO2max和HRmax的检测。采用功率自行车递增负荷运动方案,使用Fitmate Pro Kit心肺功能测试评价系统;(2)完成广播体操运动过程中VO2、HR和RPE等指标的检测。在受试学生完成本套广播体操运动过程中,检测完成每一节操后即刻以及运动前和运动后3分钟、5分钟的VO2、HR和RPE。结果:不同年龄阶段的男女中小学生在完成第三套全国中小学生系列广播体操运动过程中,%VO2max的变化趋势基本一致。安静站立时的%VO2max最低,约在10%～20%之间,随着广播体操运动的开始和进行,%VO2max逐渐增加,峰值达到60%～80%的水平,然后下降,形成一个单峰变化特点;男女学生完成四套广播体操运动过程中%VO2max平均值在30%～45%之间。受试学生完成本套广播体操运动过程中%HRmax和RPE变化与%VO2max的变化相似,%HRmax峰值达到70%～90%,平均值60%～72%;RPE峰值达到12～14,平均值在8～10之间;RPE与%VO2max、%HRmax的相关系数分别是r=0.45(P<0.01)和r=0.31(P<0.01)。结论:第三套全国中小学生系列广播体操的运动强度呈波动变化,其最大运动强度达到亚极量,但持续时间较短。总体上,本套广播体操运动负荷属于低到中等,适合中小学生健身运动。展开更多
文摘The purpose of this study was to investigate whether eight weeks of aerobic high-intensity interval training with roller ski is effective in cross-country skiers. 10 male （age, 18.28 ± 2.1 years; height, 171.26 ± 4.12 cm; weight 61.39 ± 6.28 kg） and 8 female （age, 16.05 ± 0.3 years; height, 158.3 ± 6.47 cm; weight, 49.34 ± 0.7 kg） junior cross country skiers completed the study. All skiers performed a 2 × 2-kin all-out uphill intervals with roller-skis, 3 times a week, in addition to their traditional training program. Measurements included VO2max （maximal oxygen uptake）, anaerobic power, and also for 2-km roller ski. All values were listed as pre-to post-test mean （± SD）, significant level, and percentage changes （%）. Pre-to post-testing changes in VO2max, anaerobic power, and also 2-kin roller ski performance were significantly higher during all post-test trials in all groups （P 〈 0.005）. With reference to the training effects found in our study, we suggest that the skiers should integrate the roller ski aerobic high-intensity interval uphill models in their training programs for improving performance.
文摘The interaction of pulsed electromagnetic fields (PEMF) with the human body may result in a variety of positive outcomes including analgesia, enhanced healing, chondroprotection, cognitive improvement and better quality of life. Previous human studies have also revealed the potential of PEMF to enhance muscle function and athletic performance. To further evaluate this potential, an open label pilot study was conducted with 19 competitive cyclists who repeatedly participated in 63 training routes. Cyclist performance was tracked before and during use of a novel and portable PEMF device that is worn as a wristband. Comparison of performance before and during use of the wristband revealed a significant association with improved muscle power. The odds ratio was 3.02 (P < 0.01) for experiencing increased muscle power while wearing the PEMF device. Among the cycling routes in which an increase was observed, the average increase in power was about 9.8%. The data suggests the novel PEMF technology may be a safe and effective therapeutic approach for improved physical performance and likely involves improved oxygen delivery due to reduced rouleaux (erythrocyte aggregation). These results warrant further investigation comprising larger studies and additional outcomes.
文摘目的:客观评价第三套全国中小学生系列广播体操的运动负荷。方法:在北京市朝阳区四所中小学中随机抽取120名学生作为受试者,每所学校30名,男女各半。受试学生分别完成第三套全国中小学生广播体操放飞理想、舞动青春、七彩阳光和希望风帆系列中的一套操。四套广播体操的平均运动时间是268.3±4.3秒。受试学生的检测包括2个步骤:(1)VO2max和HRmax的检测。采用功率自行车递增负荷运动方案,使用Fitmate Pro Kit心肺功能测试评价系统;(2)完成广播体操运动过程中VO2、HR和RPE等指标的检测。在受试学生完成本套广播体操运动过程中,检测完成每一节操后即刻以及运动前和运动后3分钟、5分钟的VO2、HR和RPE。结果:不同年龄阶段的男女中小学生在完成第三套全国中小学生系列广播体操运动过程中,%VO2max的变化趋势基本一致。安静站立时的%VO2max最低,约在10%～20%之间,随着广播体操运动的开始和进行,%VO2max逐渐增加,峰值达到60%～80%的水平,然后下降,形成一个单峰变化特点;男女学生完成四套广播体操运动过程中%VO2max平均值在30%～45%之间。受试学生完成本套广播体操运动过程中%HRmax和RPE变化与%VO2max的变化相似,%HRmax峰值达到70%～90%,平均值60%～72%;RPE峰值达到12～14,平均值在8～10之间;RPE与%VO2max、%HRmax的相关系数分别是r=0.45(P<0.01)和r=0.31(P<0.01)。结论:第三套全国中小学生系列广播体操的运动强度呈波动变化,其最大运动强度达到亚极量,但持续时间较短。总体上,本套广播体操运动负荷属于低到中等,适合中小学生健身运动。
