Table 1.

The reliability of maximal velocity (Vmax), the load corresponding to given decrements in velocity (Lopt), and the slope of the load–velocity relationship during resisted sled pulling. Results are shown as mean ± SD and reliability statistics (95% CI). CV—coefficient of variation; ICC—intra-class correlation; Vmax—maximum velocity; Lopt—optimal load.

Reliability of Sprint Variables		Mean			Change in Mean (%)		CV (%)		ICC
		Trial 1	Trial 2	Trial 3	Trial 1–2	Trial 2–3	Trial 1–2	Trial 2–3	Trial 1–2	Trial 2–3
Vmax (m/s)	Un-resisted	7.9 ± 0.5	8.0 ± 0.4	7.9 ± 0.5	1.0	−1.5	2.8	2.1	0.84	0.88
					(−1.1–3.1)	(−3.1–0.0)	(2.1–4.4)	(1.6–3.3)	(0.64–0.95)	(0.68–0.96)
	27 kg	6.1 ± 0.8	6.1 ± 0.8	6.1 ± 0.7	−0.6	−0.7	4.9	3.1	0.84	0.92
					(−4.1–3.0)	(−1.7–3.2)	(3.6–7.6)	(2.3–5.0)	(0.60–0.94)	(0.79–0.97)
	+20% BM	5.2 ± 0.5	5.2 ± 0.5	5.1 ± 0.6	−1.1	−1.0	3.4	4.2	0.91	0.87
					(−3.5–1.4)	(−4.1–2.3)	(2.5–5.2)	(3.1–6.7)	(0.75–0.97)	(0.66–0.95)
	+40% BM	4.4 ± 0.6	4.1 ± 0.4	4.4± 0.6	−5.7	6.2	7.1	6.7	0.72	0.77
					(−10.5–−0.7)	(1.2–11.5)	(5.2–11.3)	(4.9–10.5)	(0.36–0.89)	(0.45–0.91)
	+60% BM	3.7 ± 0.6	3.5 ± 0.5	3.8 ± 0.6	−7.1	8.0	8.6	9.0	0.69	0.73
					(−13.4–−0.4)	(0.7–15.8)	(6.1–14.6)	(6.4–14.8)	(0.24–0.90)	(0.34–0.90)
Lopt (% BM)	10% Vdec	17 ± 1	17 ± 1	17 ± 1	−1.5	0.1	3.2	3.3	0.71	0.65
					(−4.3–1.4)	(−2.8–3.0)	(2.3–5.6)	(2.3–5.6)	(0.26–0.91)	(0.15–0.88)
	25% Vdec	42 ± 4	43 ± 3	42 ± 2	1.2	−0.7	4.8	3.7	0.60	0.60
					(−3.0–5.6)	(−3.9–2.6)	(3.4–8.3)	(2.6–6.4)	(0.07–0.87)	(0.08–0.87)
	50% Vdec	84 ± 7	85 ± 5	85 ± 4	1.3	−0.6	4.6	3.5	0.63	0.64
					(−2.7–5.5)	(−3.7–2.5)	(3.3–8.0)	(2.5–6.1)	(0.12–0.88)	(0.13–0.88)
	75% Vdec	125 ± 11	128 ± 8	127 ± 5	1.4	−0.9	4.8	3.7	0.60	0.60
					(−2.8–5.8)	(−4.1–2.4)	(3.4–8.3)	(2.6–6.4)	(0.07–0.87)	(0.07–0.87)
	Slope Load–Velocity	−1.72 ± 0.15	−1.72 ± 0.08	−1.72 ± 0.06	−0.7	0.4	4.0	2.2	0.71	0.75
					(−4.1–2.9)	(−1.5–2.4)	(2.8–6.8)	(1.6–3.8)	(0.23–0.91)	(0.30–0.92)