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. 2024 Mar 13;19(3):e0300117. doi: 10.1371/journal.pone.0300117

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.