...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of NeuroEngineering Rehabilitation >Whole body oxygen uptake and evoked knee torque in response to low frequency electrical stimulation of the quadriceps muscles:
【24h】

Whole body oxygen uptake and evoked knee torque in response to low frequency electrical stimulation of the quadriceps muscles:

机译：低频电刺激股四头肌的全身氧气吸收和诱发的膝部扭力：

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

摘要

Background There is emerging evidence that isometric Neuromuscular Electrical Stimulation (NMES) may offer a way to elicit therapeutically significant increases in whole-body oxygen uptake in order to deliver aerobic exercise to patients unable to exercise volitionally, with consequent gains in cardiovascular health. The optimal stimulation frequency to elicit a significant and sustained pulmonary oxygen uptake has not been determined. The aim of this study was to examine the frequency response of the oxygen uptake and evoked torque due to NMES of the quadriceps muscles across a range of low frequencies spanning the twitch to tetanus transition. Methods Ten healthy male subjects underwent bilateral NMES of the quadriceps muscles comprising eight 4 minute bouts of intermittent stimulation at selected frequencies in the range 1 to 12 Hz, interspersed with 4 minutes rest periods. Respiratory gases and knee extensor torque were simultaneously monitored throughout. Multiple linear regression was used to fit the resulting data to an energetic model which expressed the energy rate in terms of the pulse frequency, the torque time integral and a factor representing the accumulated force developed per unit time. Results Additional oxygen uptake increased over the frequency range to a maximum of 564 (SD 114) ml min-1 at 12 Hz, and the respiratory exchange ratio was close to unity from 4 to 12 Hz. While the highest induced torque occurred at 12 Hz, the peak of the force development factor occurred at 6 Hz. The regression model accounted for 88% of the variability in the observed energetic response. Conclusions Taking into account the requirement to avoid prolonged tetanic contractions and to minimize evoked torque, the results suggest that the ideal frequency for sustainable aerobic exercise is 4 to 5 Hz, which coincided in this study with the frequency above which significant twitch force summation occurred.
机译：背景技术越来越多的证据表明，等距神经肌肉电刺激（NMES）可能提供一种引发治疗性显着增加全身氧气吸收的方法，以便向无法自愿运动的患者提供有氧运动，从而改善心血管健康。尚未确定引起明显且持续的肺氧摄取的最佳刺激频率。这项研究的目的是研究跨越抽搐到破伤风过渡的一系列低频范围内的股四头肌肌肉NMES引起的摄氧量和诱发扭矩的频率响应。方法十名健康的男性受试者接受四头肌的双侧NMES训练，包括八次4分钟的间歇性刺激，以1至12 Hz的选定频率进行穿刺，并穿插4分钟的休息时间。整个过程中同时监测呼吸气体和膝盖伸肌扭矩。使用多元线性回归将结果数据拟合到一个高能模型，该模型以脉冲频率，转矩时间积分和代表每单位时间产生的累积力的因数表示能量速率。结果在该频率范围内，额外的氧气吸收在12 Hz时增加到最大564（SD 114）ml min-1，呼吸交换比从4到12 Hz接近统一。最高的感应扭矩出现在12 Hz，而力发展因子的峰值出现在6 Hz。回归模型占观察到的高能反应变异性的88％。结论考虑到避免长时间的强直性收缩和最小化诱发扭矩的要求，结果表明可持续的有氧运动的理想频率为4至5 Hz，该频率与发生显着的抽动力总和的频率相符。

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