Table 2 Normalized voluntary peak EMG (%EMGmax) activity, absolute load, perceived exertion and knee pain during the strength training exercises
Exercise | VM (%), mean ± SD | VL (%), mean ± SD | Quadriceps (%), mean ± SD | ST (%), mean ± SD | BF (%), mean ± SD | Hamstring (%), mean ± SD | Load on operated leg (kg)a/load on non-operated leg (kg)b/toe-to-toe distance (cm)c/elastic resistance (no., color)e, mean ± SD | Perceived exertion (Borg scale, points), experimental session, mean ± SD | Knee pain during exercise (VAS-mm), experimental session, median (IQR) |
|---|---|---|---|---|---|---|---|---|---|
Knee extensions in machine (KEM) | 72.8 (20.1)d | 71.8 (20.7)d | 72.3 (19.2)d | 15.2 (8.6)d | 35.6 (20.7)d | 25.4 (13.1)d | 8.8 (4.0)a | 12.4 (2.3) | 0 (0–26) |
Knee extensions with elastic band (KEE) | 97.6 (32.4) | 88.9 (27.6) | 93.3 (28.5) | 18.6 (11.0) | 38.5 (25.8) | 28.5 (16.0) | 1 green (n = 3)e 1 blue (n = 5)e 2 green (n = 6)e 1 green+ 1 blue (n = 2)e 2 blue (n = 6)e 2 green+ 1 red (n = 1)e 2 blue (n = 1)e | 12.3 (2.6) | 0 (0–10) |
Leg press in machine (LEP) | 66.3 (27.3) | 67.2 (23.4) | 66.8 (23.9) | 25.8 (14.5) | 42.1 (18.4) | 33.9 (14.1) | 28.5 (10.8)a | 12.6 (2.4) | 0 (0–18) |
Sit-to-stand (STS) | 84.9 (26.0) | 76.4 (20.4) | 80.7 (17.6) | 24.8 (12.6) | 45.7 (27.1) | 35.3 (18.1) | 31.8 (11.1)b 17.0 (8.5)c | 12.6 (2.2) | 1 (0–17) |
One-legged squat (OSQUAT) | 90.44 (26.3) | 82.92 (21.8) | 86.7 (19.3) | 37.6 (13.7) | 66.2 (42.2) | 51.9 (25.0) | 26.9 (12.6)b 71.3 (18.7)c | 13.3 (2.8) | 0 (0–19) |
Straight leg raise (SLR) | 60.17 (35.3) | 61.00 (26.9) | 60.6 (29.4) | 16.3 (16.0) | 26.7 (16.3) | 21.5 (12.0) | 1.3 (1.2)a | 12.0 (2.5) | 0 (0–8) |