Faculdade Alfredo Nasser, Goiás, Brazil.
Laboratory of Spirometry and Respiratory Physiotherapy-LEFiR, Federal University of São Carlos, São Paulo, Brazil.
Phys Ther. 2021 Sep 1;101(9). doi: 10.1093/ptj/pzab107.
This study aimed to evaluate the intrarater and interrater reliability of isometric quadriceps strength (IQS) using a portable dynamometer in individuals with chronic obstructive pulmonary disease (COPD) and to verify their tolerance to the protocol.
A cross-sectional reliability study was conducted with 50 individuals with stable COPD (34 men and 16 women; mean age = 70 years [SD = 8]). The main outcome measure was obtained using a portable dynamometer (Microfet 2) to assess IQS. Two masked raters performed 2 assessments in the dominant lower limb on 2 nonconsecutive days. The intraclass correlation coefficient (ICC) was used to verify the intrarater and interrater reliability and was considered excellent when >0.90, with a 5% significance level.
Rater 1 and 2 intrarater reliability was as follows: ICC = 0.96 (95% CI = 0.94 to 0.98) and ICC = 0.97 (95% CI = 0.95 to 0.98), respectively. The interrater reliability was as follows: ICC = 0.96 (95% CI = 0.93 to 0.98). The minimum detectable difference was 4 to 5 peak isometric strength, in mean, for intrarater and interrater reliability. Not all patients presented relevant changes in physiological responses, dyspnea, and lower limb fatigue.
There was an excellent intrarater and interrater reliability for IQS, and the participants tolerated the protocol.
This tool can be used to assess quadriceps strength in clinical practice in patients with COPD.
本研究旨在评估使用便携式测力计评估慢性阻塞性肺疾病（COPD）患者等长股四头肌力量（IQS）的内部和外部可靠性，并验证其对方案的耐受性。
进行了一项横断面可靠性研究，共纳入 50 名稳定期 COPD 患者（34 名男性，16 名女性；平均年龄 70 岁[SD=8]）。主要结局测量采用便携式测力计（Microfet 2）评估 IQS。两名盲法评估者在 2 个非连续日内对优势下肢进行了 2 次评估。采用组内相关系数（ICC）评估内部和外部可靠性，当>0.90 时认为具有极好的可靠性，显著性水平为 5%。
评估者 1 和 2 的内部可靠性如下：ICC=0.96（95%置信区间[CI]：0.94 至 0.98）和 ICC=0.97（95% CI：0.95 至 0.98）。外部可靠性如下：ICC=0.96（95% CI=0.93 至 0.98）。内部和外部可靠性的最小可检测差异分别为 4 至 5 峰值等长力量，平均而言。并非所有患者的生理反应、呼吸困难和下肢疲劳都有明显变化。
IQS 的内部和外部可靠性极好，患者耐受方案。
该工具可用于 COPD 患者的临床实践中评估股四头肌力量。
