Table 1 Muscle Onset, Duration, and Offset.
| Mean (SD) onset (ms) | Mean (SD) offset (ms) | Mean (SD) duration (ms) | Serve motion (%) | Range (%) | |
|---|---|---|---|---|---|
| Supraspinatus | −103.83 (50.98) | 262.17 (153.8) | 366.0 (112.7) | 58 | 38–69 |
| Infraspinatus | 47.05 (101.9) | 230.95 (113.6) | 183.9 (101.5) | 28 | 18–31 |
| Teres minor | −214.75 (64.7) | 319.5 (66.2) | 534.25 (66.1) | 81 | 77–91 |
| Serratus anterior | −286.98 (297.4) | 199.87 (128.7) | 486.85 (226.4) | 74 | 39–89 |
| Upper trapezius | −234.45 (211.9) | 225.29 (186.5) | 459.74 (193.7) | 70 | 39–92 |
| Lower trapezius | −119.7 (100.5) | 296.25 (195.5) | 425.95 (148) | 62 | 46–71 |
| Anterior deltoid | −250.3 (194.8) | 170.1 (147.1) | 420.4 (164.5) | 63 | 40–72 |
| Posterior deltoid | −157.8 (45.9) | 281.54 (97.4) | 439.34 (67.7) | 67 | 54–77 |
Values expressed in relation to ball impact (T0). Activations prior to T0 = negative numbers. Activations after T0 = positive numbers.