Quadriceps muscle properties in rheumatoid arthritis: insights about muscle morphology, activation and functional capacity

Advances in Rheumatology

article

Blum, Denise¹  Rodrigues, Rodrigo²  Geremia, Jeam Marcel²  Brenol, Claiton Viegas¹  Vaz, Marco Aurélio²  Xavier, Ricardo Machado¹ 

[1] Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul;Laboratório de Pesquisa do Exercício, Universidade Federal do Rio Grande do Sul;Centro Universitário da Serra Gaúcha

关键词: Arthritis;    rheumatoid;    Quadriceps muscle;    Electromyography;    Muscular atrophy;    Muscle strength;   

DOI  :  10.1186/s42358-020-00132-w

学科分类：地球科学(综合)

来源: Springer

【 摘 要 】

Rheumatoid arthritis (RA) is an inflammatory and chronic autoimmune disease that leads to muscle mass loss and functional capacity impairment, potentiated by physical inactivity. Despite evidences demonstrate neuromuscular impairments in RA patients, aging effects may have masked the results of similar previous studies. The aim of study was to verify (i) the effects of RA on functional capacity and muscle properties in middle-aged patients and (ii) the association between age, clinical characteristics, quadriceps muscle properties and functional capacity. Thirty-five RA women and 35 healthy age-matched women were compared with the following outcomes: (i) physical activity level through the International Physical Activity Questionnaire (IPAQ); (ii) timed-up and go (TUG) test; (iii) isometric knee extensor muscular strength; and (iv) vastus lateralis muscle activation and muscle architecture (muscle thickness, pennation angle and fascicle length) during an isometric test. An independent Student t-test and partial correlation (controlled by physical activity levels) were performed, with p < 0.05. Compared with healthy women, RA presented (i) lower physical activity level (− 29.4%; p < 0.001); (ii) lower isometric knee extensor strength (− 20.5%; p < 0.001); (iii) lower TUG performance (− 21.7%; p < 0.001); (iv) smaller muscle thickness (− 23.3%; p < 0.001) and pennation angle (− 14.1%; p = 0.011). No differences were observed in muscle activation and fascicle length. Finally, the correlation demonstrated that, with exception of TUG, muscle strength and muscle morphology were not associated with age in RA, differently from healthy participants. Middle-aged RA patients’ impairments occurred due to the disease independently of the aging process, except for functional capacity. Physical inactivity may have potentiated these losses.

【 授权许可】

CC BY