Table 2. Average muscle thicknesses (cm).

	Variable	Sprinters		Hurdlers
		Rest	Contracted	Rest	Contracted
Left	IO Thickness	1.4 (± 0.2)	1.8 (± 0.6)	1.2 (± 0.3)	1.7 (± 0.5) * p = 0.002; d = 1
	EO Thickness	0.9 (± 0.2)	1.1 (± 0.2) * p = 0.003; d = 1	0.9 (± 0.1)	1.0 (± 0.2) * p = 0.017; d = 0.5
Right	IO Thickness	1.1 (± 0.2)	1.7 (± 0.3) * p < 0.001; d = 2	1.1 (± 0.3)	1.3 (± 0.4) * p = 0.018; d = 0.5
	EO Thickness	0.8 (± 0.1)	0.9 (± 0.1)	0.8 (± 0.1)	0.8 (± 0.1)

Data are mean (± standard deviation) within-group. p-values are compared to rest within group. Following mean (± standard deviation) are p-values and Cohen’s d effect size for statistically significant values (*).