Shingai Kazuya, Kanezaki Masashi
Department of Rehabilitation, Tosei General Hospital, Japan.
Department of Physical Therapy, Faculty of Health Care Sciences, Himeji Dokkyo University, Japan.
J Phys Ther Sci. 2014 Feb;26(2):255-8. doi: 10.1589/jpts.26.255. Epub 2014 Feb 28.
[Purpose] The purpose of the present study was to clarify the effect of dyspnea induced by breath-holding on maximum muscular strength of patients with COPD. [Subjects] This study recruited 14 COPD subjects via public posting. [Methods] Dyspnea was assessed by the modified Borg scale. The subject asked to stop breathing at end-expiration and to hold their breath with a nose clip for as long as possible. Both total breath-holding time and threshold time of dyspnea were measured with a chronograph. Dyspnea reserve time (DRT) was defined by subtracting the threshold time of perception dyspnea from total breath-holding time in order to calculate the 50% DRT. The muscular strengths of maximal handgrip contraction were measured at baseline, 50% threshold time of dyspnea (subliminal point of dyspnea), and the 50% DRT (supraliminal point of dyspnea). [Results] The maximal handgrip at the supraliminal point of dyspnea was significantly lower than the baseline and subliminal point of dyspnea values. There was no statistically significant difference in maximal muscular strength between baseline and the subliminal point of dyspnea value. [Conclusion] The present results demonstrate that dyspnea induced by breath-holding aggravates weakness in the maximum muscular strength of patients with COPD.
[目的]本研究旨在阐明屏气诱发的呼吸困难对慢性阻塞性肺疾病（COPD）患者最大肌肉力量的影响。[对象]本研究通过公开招募的方式纳入了14例COPD受试者。[方法]采用改良的Borg量表评估呼吸困难程度。受试者在呼气末停止呼吸，并用鼻夹尽可能长时间地屏气。用计时器测量总屏气时间和呼吸困难阈值时间。为计算50%的呼吸困难储备时间（DRT），用总屏气时间减去呼吸困难感知阈值时间来定义DRT。在基线、呼吸困难阈值时间的50%（呼吸困难阈下点）和50% DRT（呼吸困难阈上点）时测量最大握力收缩的肌肉力量。[结果]呼吸困难阈上点的最大握力显著低于基线和呼吸困难阈下点的值。基线和呼吸困难阈下点值之间的最大肌肉力量无统计学显著差异。[结论]目前的结果表明，屏气诱发的呼吸困难会加重COPD患者最大肌肉力量的虚弱。
