Table 2.
Surface EMG Amplitude and Force by Radiographic Severity and Effort
| Kellgren & Lawrence Grade | 0 (N=18) | I (N=4) | II (N=4) | III (N=9) | IV (N=4) | P-Value | P-Value Interaction |
|---|---|---|---|---|---|---|---|
| MVIC (N) | 461.3±174.6 | 364.9±438.6 | 438.6±148.9 | 337.9±58.6 | 242.9±112.4 | 0.050 | |
| Surface-EMG Amplitude (µV*) | |||||||
| 10% | 53.6±26.1 | 81.3±16.2 | 76.3±40.8 | 46.6±21.4 | 43.3±11.1 | 0.800 | <.0001† |
| 20% | 84.5±37.0 | 120.7±18.61 | 110.7±54.3 | 66.0±31.2 | 48.8 | 0.255 | |
| 30% | 105.6±40.0 | 134.6±22.04 | 152.3±70.2 | 85.34±35.0 | 74.9±24.04 | 0.031 | |
| 50% | 173.22±71.8 | 194.3±47.6 | 236.8±146.9 | 123.0±39.8 | 92.7±26.3 | 0.031 | |
| MUs Detected of 2312 Total | 280 | 216 | 230 | 486 | 208 | ||
| S-MUAP Area (µV*msec) | |||||||
| 10% | 323.9±204.0 | 399.5±160.9 | 407.4±235.8 | 265.3±145.3 | 265.4±119.7 | 0.47 | <.0001† |
| 20% | 523.7±338.7 | 586.1±240.2 | 550.0±271.4 | 382.8±250.3 | 267.6±143.3 | 0.42 | |
| 30% | 650.6±398.6 | 714.9±281.3 | 731.3±367.9 | 508.0±316.0 | 416.6±198.1 | 0.18 | |
| 50% | 1078.9±818.3 | 1065.2±537.7 | 1035.8±563.6 | 791.4±441.0 | 500.1±251.4 | 0.06 | |
†
P-values from interactions using mixed effects model (OA by % effort).