Is larger eccentric utilization ratio associated with poorer rate of force development in squat jump? An exploratory study

Figures & data

Table 1. Participant characteristics (means and standard deviations).

Sex	Sport	Age (years)	Body mass (kg)	Body height (m)	Training history (years)*
Men	Basketball (n = 106)	16.7 ± 1.2	80.4 ± 12.6	1.88 ± 0.08	7.1 ± 3.0
	Students (n = 31)	19.6 ± 0.4	76.6 ± 8.2	1.82 ± 0.06	/
	Soccer (n = 42)	16.6 ± 1.1	70.2 ± 11.3	1.78 ± 0.07	7.4 ± 2.3
	Running (n = 30)	30.6 ± 9.3	78.1 ± 6.9	1.82 ± 0.06	11.2 ± 8.7
Women	Basketball (n = 58)	16.7 ± 1.5	70.2 ± 11.2	1.75 ± 0.05	6.6 ± 3.2
	Students (n = 27)	19.7 ± 0.7	59.8 ± 7.6	1.66 ± 0.06	/
	Running (n = 19)	36.3 ± 10.8	61.1 ± 7.4	1.68 ± 0.08	7.5 ± 4.2

*Defined as the years of regular participation in sports training.

Table 2. Descriptive statistics for main outcome variables.

Outcome variable	Men (n = 209)		Women (n = 104)
	Mean	SD	Mean	SD
SJ Height (cm)	29.11	5.25	22.03	4.15
SJ Peak Force (%BW)	244.9	26.2	221.0	21.9
SJ Peak Power (W/kg)	46.3	7.59	45.1	7.8
CMJ Height (cm)	31.86	5.26	23.75	4.31
CMJ Peak Force (%BW)	249.6	24.0	226.4	19.7
SJ Peak Power (W/kg)	47.4	8.2	45.4	7.5
EURJH	1.11	0.13	1.08	0.11
EURPF	1.03	0.11	1.03	0.10
EURPP	1.01	0.07	1.00	0.07
SJ RFD (N/kg/s)	140.3	63.9	103.3	45.7

SJ – squat jump; CMJ – countermovement jump; EUR_JH – eccentric utilization ratio based on jump height; EUR_PF – eccentric utilization ratio based on peak force; EUR_PP – eccentric utilization ratio based on peak power; RFD – rate of force development; SD – standard deviation.

Table 3. Sex and sport-specific correlation analysis.

Sex	Sport	EURJH		EURPF		EURP
		r	p	r	p	r	p
Men	Basketball (n = 106)	0.14	0.158	−0.58*	<0.001	−0.34**	<0.001
	Students (n = 31)	0.29	0.119	−0.41*	0.023	−0.14	0.453
	Soccer (n = 42)	−0.15	0.335	−0.36*	0.020	−0.33*	0.034
	Running (n = 30)	−0.14	0.450	−0.29	0.109	−0.49**	0.006
Women	Basketball (n = 58)	0.17	0.196	−0.24	0.074	−0.22	0.094
	Students (n = 27)	0.24	0.232	−0.43*	0.024	−0.07	0.728
	Running (n = 19)	−0.23	0.339	−0.15	0.525	-–0.25	0.312

EUR_JH – eccentric utilization ratio based on jump height; EUR_PF – eccentric utilization ratio based on peak force.