Reliability of Quadriceps Femoris Muscle Strength Assessment Using a Portable Dynamometer and Protocol Tolerance in Patients With Chronic Obstructive Pulmonary Disease

Abstract Objective 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. Methods A cross-sectional reli...

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Bibliographic Details
Published in:Physical therapy 2021-09, Vol.101 (9)
Main Authors: Sentanin, Anna Claudia, de Facio, Carina Araujo, da Silva, Marcela Maria Carvalho, Sousa, Fernanda Cristina, Arcuri, Juliano Ferreira, Mendes, Renata Gonçalves, Di Lorenzo, Valéria Amorim Pires
Format: Article
Language:English
Subjects:
Chronic obstructive pulmonary disease
Muscle strength
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Summary:Abstract Objective 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. Methods 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. Results 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. Conclusion There was an excellent intrarater and interrater reliability for IQS, and the participants tolerated the protocol. Impact This tool can be used to assess quadriceps strength in clinical practice in patients with COPD.
ISSN:0031-9023
1538-6724
DOI:10.1093/ptj/pzab107