Table 1. GPS speed and sEMG muscle activity for each muscle group at every shuttle run intensity for all the athletes.
| Expected average shuttle speeda | Observed average shuttle speed (m/s)b | Normalized sEMG Left Gluteus | Normalized sEMG Left Hamstring | Normalized sEMG Left Quadriceps | Normalized sEMG Right Gluteus | Normalized sEMG Right Hamstring | Normalized sEMG Right Quadriceps |
|---|---|---|---|---|---|---|---|
| V = 2,22 m·s -1 | 2.07 ± 0.67 [2.04–2.09] 32.44 | 0.19 ± 0.13 [0.18–0.19] 70.34 | 0.19 ± 0.07 [0.18–0.19] 39.51 | 0.19 ± 0.1 [0.19–0.19] 50.97 | 0.18 ± 0.07 [0.18–0.18] 39.52 | 0.19 ± 0.07 [0.18–0.19] 36.32 | 0.21 ± 0.09 [0.20–0.21] 42.33 |
| V = 2,50 m·s -1 | 2.28 ± 0.69 [2.26–2.31] 30.01 | 0.18 ± 0.10 [0.17–0.18] 54.72 | 0.20 ± 0.08 [0.19–0.2] 38.5 | 0.19 ± 0.08 [0.18–0.19] 43.78 | 0.20 ± 0.07 [0.20–0.20] 32.64 | 0.20 ± 0.08 [0.20–0.20] 39.57 | 0.21 ± 0.07 [0.20–0.21] 35.74 |
| V = 2,78 m·s -1 | 2.49 ± 0.77 [2.46–2.52] 30.69 | 0.20 ± 0.09 [0.2–0.2] 46.31 | 0.21 ± 0.08 [0.21–0.21] 37.19 | 0.21 ± 0.09 [0.21–0.21] 43.39 | 0.21 ± 0.07 [0.21–0.22] 32.16 | 0.22 ± 0.08 [0.21–0.22] 36.98 | 0.23 ± 0.08 [0.22–0.23] 36.77 |
| V = 3,06 m·s -1 | 2.59 ± 0.88 [2.55–2.63] 34.09 | 0.21 ± 0.10 [0.21–0.22] 47.5 | 0.21 ± 0.08 [0.21–0.22] 38.11 | 0.21 ± 0.09 [0.21–0.22] 43.25 | 0.22 ± 0.07 [0.22–0.22] 31.67 | 0.22 ± 0.08 [0.21–0.22] 38.46 | 0.23 ± 0.08 [0.22–0.23] 36.82 |
| V = 3,33 m·s -1 | 2.76 ± 0.97 [2.72–2.8] 34.99 | 0.23 ± 0.11 [0.23–0.24] 47.24 | 0.23 ± 0.08 [0.23–0.23] 35.9 | 0.23 ± 0.09 [0.22–0.23] 40.42 | 0.24 ± 0.08 [0.24–0.24] 32.81 | 0.24 ± 0.09 [0.24–0.24] 38.49 | 0.25 ± 0.1 [0.24–0.25] 39.53 |
| V = 3,61 m·s -1 | 3.05 ± 1.07 [3.00–3.09] 35.12 | 0.26 ± 0.12 [0.26–0.27] 46.2 | 0.25 ± 0.09 [0.25–0.25] 35.11 | 0.25 ± 0.10 [0.25–0.26] 38.8 | 0.26 ± 0.08 [0.26–0.27] 29.22 | 0.26 ± 0.08 [0.26–0.27] 31.95 | 0.27 ± 0.09 [0.27–0.27] 33.38 |
| V = 3,89 m·s -1 | 3.2 ± 1.19 [3.15–3.25] 37.06 | 0.28 ± 0.13 [0.28–0.29] 46.36 | 0.27 ± 0.10 [0.26–0.27] 35.64 | 0.27 ± 0.11 [0.26–0.27] 39.29 | 0.28 ± 0.09 [0.28–0.29] 32.5 | 0.29 ± 0.10 [0.28–0.29] 34.72 | 0.29 ± 0.11 [0.28–0.29] 36.94 |
| V = 4,17 m·s -1 | 3.32 ± 1.28 [3.27–3.38] 38.58 | 0.30 ± 0.14 [0.29–0.30] 46.37 | 0.27 ± 0.10 [0.27–0.28] 34.60 | 0.28 ± 0.11 [0.27–0.28] 38.99 | 0.29 ± 0.10 [0.29–0.29] 33.33 | 0.30 ± 0.11 [0.30–0.31] 35.48 | 0.31 ± 0.11 [0.30–0.31] 36.70 |
| V = 4,44 m·s -1 | 3.56 ± 1.38 [3.50–3.62] 38.86 | 0.33 ± 0.16 [0.32–0.34] 47.07 | 0.31 ± 0.11 [0.30–0.31] 35.17 | 0.31 ± 0.12 [0.30–0.32] 37.79 | 0.3 ± 0.09 [0.30–0.31] 28.63 | 0.33 ± 0.11 [0.32–0.33] 35.09 | 0.34 ± 0.13 [0.34–0.35] 38.40 |
| V = 4,72 m·s -1 | 3.72 ± 1.48 [3.65–3.80] 39.64 | 0.37 ± 0.17 [0.37–0.38] 45.51 | 0.34 ± 0.12 [0.34–0.35] 35.18 | 0.34 ± 0.13 [0.34–0.35] 37.35 | 0.35 ± 0.13 [0.34–0.35] 37.52 | 0.36 ± 0.13 [0.36–0.37] 34.37 | 0.37 ± 0.13 [0.37–0.38] 36.16 |
| V = 5,00 m·s -1 | 3.82 ± 1.63 [3.74–3.90] 42.59 | 0.38 ± 0.17 [0.37–0.39] 45.86 | 0.36 ± 0.14 [0.35–0.36] 39.05 | 0.37 ± 0.15 [0.36–0.37] 42.32 | 0.37 ± 0.13 [0.36–0.38] 35.91 | 0.38 ± 0.15 [0.38–0.39] 39.54 | 0.40 ± 0.16 [0.39–0.41] 40.99 |
Data are presented as mean ± SD, 95% C.I. (lower and upper bounds) and CV. Normalized sEMG data are presented as ratio between sEMGi / sEMGmax.
a As specified by the shuttle run protocol, at speeds dictated by the audio track, including turns.
bAs measured by GPS, including turns.