Table 3. Adjusted mean outcomes by group over time.
| Time Point | Baseline | 1 Month | 2 Months | 3 Months | 6 month | 12 month | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
| ||||||||||||
| Outcome | HI Group N Mean (SD) |
LI Group N Mean (SD) |
HI Group N Mean (SD) |
LI Group N Mean (SD) |
HI Group N Mean (SD) |
LI Group N Mean (SD) |
HI Group N Mean (SD) |
LI Group N Mean (SD) |
HI Group N Mean (SD) |
LI Group N Mean (SD) |
HI Group N Mean (SD) |
LI Group N Mean (SD) |
| Stair Climbing Test (s) | 84 17.20 (8.64) | 78 16.41 (7.99) | 82 24.93 (12.39) | 78 24.42 (8.51) | 79 15.16 (5.78) | 77 15.27 (4.67) | 77 13.02 (4.62) | 77 13.60 (3.58) | 71 11.78 (4.29) | 71 12.15 (3.30) | 70 11.40 (3.62) | 67 11.77 (3.15) |
| Timed-up- and-Go Test (s) | 84 9.00 (2.91) | 78 8.87 (2.46) | 82 10.84 (4.16) | 78 10.48 (2.60) | 79 8.36 (2.42) | 77 8.27 (1.67) | 77 7.58 (1.82) | 77 7.98 (1.58) | 71 7.33 (1.60) | 71 7.48 (1.45) | 71 7.36 (1.77) | 67 7.44 (1.50) |
| 6-minute Walk Test (m) | 84 454.6 (105.7) | 77 466.5 (98.7) | 82 392.4 (100.4) | 78 374.4 (87.33) | 79 467.7 (96.6) | 77 465.6 (84.3) | 77 493.7 (92.4) | 76 478.7 (82.7) | 71 520.3 (91.1) | 71 511.7 (77.7) | 69 531.7 (98.9) | 67 513.6 (78.4) |
| WOMAC | 84 34.24 (13.15) | 77 33.32 (15.00) | 78 29.27 (11.64) | 76 30.13 (12.30) | 77 19.34 (10.56) | 74 19.57 (11.24) | 72 14.49 (8.98) | 75 14.55 (8.38) | 66 8.97 (7.27) | 67 10.60 (9.45) | 62 6.69 (7.75) | 62 7.16 (6.28) |
| S-12 PCS | 83 36.12 (9.44) | 74 36.50 (8.75) | 78 33.23 (8.81) | 73 33.07 (7.83) | 76 40.63 (8.01) | 75 39.15 (8.72) | 75 45.92 (7.96) | 75 43.09 (9.40) | 71 50.84 (6.23) | 68 49.02 (7.37) | 67 51.59 (8.33) | 61 50.07 (7.16) |
| SF-12 MCS | 83 54.15 (9.49) | 74 53.64 (9.81) | 78 51.83 (9.99) | 73 50.51 (9.59) | 76 56.30 (8.74) | 75 56.69 (8.50) | 75 56.73 (7.29) | 75 57.05 (6.86) | 71 55.76 (7.26) | 68 56.64 (6.20) | 67 55.76 (6.48) | 61 57.83 (3.58) |
| Knee Extension (°) | 84 0.69 (3.97) | 78 0.15 (3.69) | 82 1.83 (2.91) | 78 2.45 (2.60) | 79 0.85 (2.92) | 77 0.82 (2.25) | 77 -0.09 (2.97) | 77 0.06 (2.37) | 71 -1.38 (1.66) | 71 -0.90 (2.62) | 71 -2.18 (2.43) | 67 -1.76 (2.28) |
| Knee Flexion (°) | 84 125.54 (10.24) | 78 125.76 (10.95) | 82 108.10 (15.12) | 78 110.83 (10.81) | 79 119.25 (10.75) | 77 120.10 (9.38) | 77 123.79 (9.10) | 77 123.71 (8.97) | 71 127.10 (6.57) | 71 127.45 (7.88) | 71 129.28 (8.89) | 67 128.27 (8.61) |
| Quadriceps Strength (Nm/kg) | 84 1.18 (0.54) | 78 1.24 (0.49) | 81 0.75 (0.32) | 77 0.80 (0.34) | 78 1.07 (0.38) | 77 1.07 (0.38) | 77 1.21 (0.42) | 76 1.15 (0.40) | 71 1.35 (0.46) | 71 1.35 (0.40) | 70 1.42 (0.47) | 67 1.43 (0.44) |
| Hamstrings Strength (Nm/kg) | 84 0.73 (0.32) | 78 0.75 (0.29) | 81 0.56 (0.24) | 77 0.57 (0.22) | 78 0.68 (0.25) | 77 0.70 (0.23) | 77 0.76 (0.28) | 76 0.74 (0.26) | 71 0.80 (0.29) | 71 0.80 (0.27) | 70 0.84 (0.31) | 67 0.85 (0.29) |
| Quadriceps Activation (%) | 74 70.86 (16.80) | 71 72.27 (14.17) | 68 72.45 (17.02) | 62 73.14 (20.25) | 66 80.65 (13.60) | 64 80.34 (16.96) | 67 82.77 (10.78) | 63 79.94 (13.78) | 61 80.87 (12.01) | 62 82.92 (9.55) | 62 83.39 (11.73) | 59 83.73 (10.12) |
| PASE | 84 150.77 (96.32) | 76 153.84 (97.21) | 77 83.42 (55.80) | 75 76.25 (48.15) | 76 136.53 (90.63) | 74 131.96 (80.03) | 75 168.51 (103.36) | 75 162.48 (86.87) | 63 169.59 (80.67) | 60 171.98 (81.12) | 45 208.23 (89.51) | 47 166.48 (74.74) |
All values are adjusted for baseline, sex, and clinical site. Negative values of knee extension represent hyperextension. HI=High-intensity group. LI= Low-intensity group. WOMAC=Western Ontario and McMaster Universities Osteoarthritis Index. SF-12=Short-form 12. PASE=Physical Activity Scale for the Elderly.