Influence of obstructive sleep apnea syndrome in the fluctuation of the submaximal isometric torque of knee extensors in patients with early-grade osteoarthritis

Author(s)

Silva, Andressa ^[1] ; Mello, Marco T. ^[2] ; Serrao, Paula R. ^[1] ; Luz, Roberta P. ^[1] ; Bittencourt, Lia R. ^[3] ; Mattiello, Stela M. ^[1]

Affiliation

^[1] Univ Fed Sao Carlos, Dept Fisioterapia, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Minas Gerais, Dept Esportes, Belo Horizonte, MG - Brazil

^[3] Univ Fed Sao Paulo, Dept Psicobiol, Sao Paulo - Brazil

• Document type: Journal article
• Source: BRAZILIAN JOURNAL OF PHYSICAL THERAPY; v. 19, n. 4, p. 271-278, JUL-AUG 2015.
• Web of Science Citations: 1

Abstract

OBJECTIVE: The aim of this study was to investigate whether obstructive sleep apnea (OSA) alters the fluctuation of submaximal isometric torque of the knee extensors in patients with early-grade osteoarthritis (OA).METHOD: The study included 60 male volunteers, aged 40 to 70 years, divided into four groups: Group 1 (G1) - Control (n=15): without OA and without OSA; Group 2 (G2) (n=15): with OA and without OSA; Group 3 (G3) (n=15): without OA and with OSA; and Group 4 (G4) (n=15) with OA and with OSA. Five patients underwent maximal isometric contractions of 10 seconds duration each, with the knee at 60° of flexion to determine peak torque at 60°. To evaluate the fluctuation of torque, 5 submaximal isometric contractions (50% of maximum peak torque) of 10 seconds each, which were calculated from the standard deviation of torque and coefficient of variation, were performed.RESULTS: Significant differences were observed between groups for maximum peak torque, while G4 showed a lower value compared with G1 (p=0.005). Additionally, for the average torque exerted, G4 showed a lower value compared to the G1 (p=0.036). However, no differences were found between the groups for the standard deviation (p=0.844) and the coefficient of variation (p=0.143).CONCLUSION: The authors concluded that OSA did not change the parameters of the fluctuation of isometric submaximal torque of knee extensors in patients with early-grade OA. (AU)

• FAPESP's process: 10/19437-1 - INFLUENCE OF OBSTRUCTIVE SLEEP APNEA SYNDROME ON INFLAMMATORY AND FUNCTIONAL ASPECTS OF INDIVIDUALS WITH KNEE OSTEOARTHRITIS
• Grantee: Andressa da Silva de Mello
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 11/06619-7 - Influence of changes of sleep in sensory-motor control and systemic inflammatory response in patients with knee osteoarthritis of grade I or II
• Grantee: Stela Márcia Mattiello
• Support Opportunities: Regular Research Grants