Intra-rater reliability and agreement of muscle strength, power and functional performance measures in patients with hip osteoarthritis

TY - JOUR

T1 - Intra-rater reliability and agreement of muscle strength, power and functional performance measures in patients with hip osteoarthritis

AU - Bieler, Theresa

AU - Magnusson, S Peter

AU - Kjær, Michael

AU - Beyer, Nina

PY - 2014/11/1

Y1 - 2014/11/1

N2 - Objective: To investigate the reliability and agreement of measures of lower extremity muscle strength, power and functional performance in patients with hip osteoarthritis at different time intervals, and to compare these with the same measures in healthy peers. Design: Intra-rater test-retest separated by 1, 2, or 2.5 weeks in patients, and 1 week in healthy peers. Subjects: Patients with hip osteoarthritis (age range 61-83 years) with 1 (n = 37), 2 (n = 35), or 2.5 weeks (n = 15) between tests, and 35 healthy peers (age range 63-82 years). Methods: Maximal isometric hip and thigh strength, leg extensor power, and functional performance (8-foot Up & Go, stair climbing, chair stand and 6-min walk) were measured in patients, and quadriceps strength, leg extensor power and functional performance were measured in healthy peers. Systematic error, reliability and agreement were calculated. Results: Most hip strength measurements for the most symptomatic extremity, and nearly all strength measurements for the least symptomatic lower extremity, declined after 1 week (p < 0.05), but not after a 2.5-week interval. In healthy peers, quadriceps strength was unchanged. Regardless of the time interval, leg extensor power was unchanged, while functional performances improved at retest for all participants. Conclusion: In patients with hip osteoarthritis leg extensor power is unaffected by the time interval between tests, in contrast to muscle strength and functional performance.

AB - Objective: To investigate the reliability and agreement of measures of lower extremity muscle strength, power and functional performance in patients with hip osteoarthritis at different time intervals, and to compare these with the same measures in healthy peers. Design: Intra-rater test-retest separated by 1, 2, or 2.5 weeks in patients, and 1 week in healthy peers. Subjects: Patients with hip osteoarthritis (age range 61-83 years) with 1 (n = 37), 2 (n = 35), or 2.5 weeks (n = 15) between tests, and 35 healthy peers (age range 63-82 years). Methods: Maximal isometric hip and thigh strength, leg extensor power, and functional performance (8-foot Up & Go, stair climbing, chair stand and 6-min walk) were measured in patients, and quadriceps strength, leg extensor power and functional performance were measured in healthy peers. Systematic error, reliability and agreement were calculated. Results: Most hip strength measurements for the most symptomatic extremity, and nearly all strength measurements for the least symptomatic lower extremity, declined after 1 week (p < 0.05), but not after a 2.5-week interval. In healthy peers, quadriceps strength was unchanged. Regardless of the time interval, leg extensor power was unchanged, while functional performances improved at retest for all participants. Conclusion: In patients with hip osteoarthritis leg extensor power is unaffected by the time interval between tests, in contrast to muscle strength and functional performance.

KW - Aged

KW - Aged, 80 and over

KW - Case-Control Studies

KW - Denmark

KW - Disability Evaluation

KW - Exercise Therapy

KW - Female

KW - Humans

KW - Lower Extremity

KW - Male

KW - Middle Aged

KW - Muscle Strength

KW - Muscle, Skeletal

KW - Observer Variation

KW - Osteoarthritis, Hip

KW - Reproducibility of Results

KW - Walking

U2 - 10.2340/16501977-1864

DO - 10.2340/16501977-1864

M3 - Journal article

C2 - 25103138

SN - 1650-1977

VL - 46

SP - 997

EP - 1005

JO - Journal of Rehabilitation Medicine

JF - Journal of Rehabilitation Medicine

IS - 10

ER -