Concentric versus combined concentric-eccentric isokinetic training: effects on functional capacity and symptoms in patients with osteoarthrosis of the knee.
OBJECTIVE
To compare the effects of concentric and coupled concentric-eccentric isokinetic resistance training on functional capacity and symptoms of patients with osteoarthrosis (OA) of both knees.


METHODS
Repeated measures.


METHODS
A university exercise physiology laboratory.


METHODS
Twenty-three volunteers, ages 41 to 75 years. Patients were randomly assigned to 3 groups: concentric (CON, n = 9), concentric-eccentric (CON-ECC, n = 8), and nontreatment (NONTX, n = 6).


METHODS
The CON group performed 12 concentric contractions of each knee extensor and flexor muscles; the CON-ECC group performed 6 concentric and 6 eccentric contractions of each knee muscle group by using a spectrum of angular velocities ranging from 30 degrees/s to 180 degrees/s with 30 degrees/s intervals, for both sides, 3 days a week for 8 weeks.


METHODS
Functional capacity (rising from a chair, walking, stair climbing and descending) and pain during rest and activities, peak torque, and cross-sectional area (CSA) of knee muscle groups of subjects were tested before and after training.


RESULTS
Both training groups showed marked decreases (P <.001) in pain scores and increases (P <.001) in functional capacity together with increases (P <.05--.01) in peak torque and CSA of knee muscles. However, the NONTX group did not display these marked changes after the 8-week period. The results also indicated that concentric-eccentric training has a greater influence on functional capacity, especially stair climbing and descending, than that of concentric training when compared with NONTX group; however, the improvements in pain measurements were better in the CON group compared with the CON-ECC group after the training.


CONCLUSIONS
The results suggest that with the isokinetic resistance training used in this study, it is possible to improve functional capacity and decrease pain in patients with OA of the knee. The results also showed that extensive training involving a high number of repetitions and eccentric contractions was safe, effective, and well tolerated for the patients with knee OA.
Gür
Hakan
H
Department of Sports Medicine, Medical School of Uludağ University, Bursa, Turkey. hakan@uludag.edu.tr
Cakin
Nilgün
N
Akova
Bedrettin
B
Okay
Ertan
E
Küçükoğlu
Selçuk
S
D000203:Activities of Daily Living; D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D005081:Exercise Therapy; D006801:Humans; D007700:Kinetics; D007717:Knee; D008875:Middle Aged; D010003:Osteoarthritis / Q000175:diagnosis / Q000534:rehabilitation*; D010147:Pain Measurement; D016896:Treatment Outcome