Table 3.

Relationships between muscle size and architecture with measures of isometric and dynamic performance.

Measure	Outcome	IPF	RFD50	RFD100	RFD200	IMP50	IMP100	IMP200	1RM
LMT	Pearson’s r	0.46	0.29	0.27	0.18	0.32	0.33	0.32	0.56 *
	p-value	0.10	0.31	0.35	0.55	0.26	0.25	0.26	0.04
	Interpretation	Moderate	Small	Small	Small	Moderate	Moderate	Moderate	Large
SMT	Pearson’s r	0.73 *	0.59 *	0.53 *	0.52	0.54 *	0.58 *	0.59 *	0.55 *
	p-value	<0.01	0.03	0.05	0.06	0.04	0.03	0.03	0.04
	Interpretation	Very Large	Large	Large	Large	Large	Large	Large	Large
LPA	Pearson’s r	0.20	−0.04	0.02	−0.03	0.13	0.11	0.09	0.46
	p-value	0.49	0.90	0.95	0.91	0.67	0.72	0.76	0.10
	Interpretation	Small	Trivial	Trivial	Trivial	Small	Small	Trivial	Moderate
SPA	Pearson’s r	0.49	0.59 *	0.66 *	0.54 *	0.38	0.47	0.53 *	0.32
	p-value	0.08	0.03	0.01	0.05	0.18	0.09	0.05	0.26
	Interpretation	Moderate	Large	Large	Large	Moderate	Moderate	Large	Moderate
LCSA	Pearson’s r	0.38	0.33	0.25	0.27	0.52	0.49	0.44	0.60 *
	p-value	0.18	0.25	0.38	0.36	0.06	0.08	0.11	0.03
	Interpretation	Moderate	Moderate	Small	Small	Large	Moderate	Moderate	Large
SCSA	Pearson’s r	0.58 *	0.50	0.48	0.46	0.62 *	0.63 *	0.61 *	0.77 *
	p-value	0.03	0.07	0.08	0.10	0.02	0.02	0.02	<0.01
	Interpretation	Large	Large	Moderate	Moderate	Large	Large	Large	Very Large

* = statistically significant relationship (p ≤ 0.05). LMT = lying muscle thickness; SMT = standing muscle thickness; LPA = lying pennation angle; SPA = standing pennation angle; LCSA = lying cross-sectional area; SCSA = standing cross-sectional area; IPF = isometric peak force; RFD50 = rate of force development at 50 ms; RFD100 = rate of force development at 100 ms; RFD150 = rate of force development at 150 ms; RFD200 = rate of force development at 200 ms; IMP50 = impulse at 50 ms; IMP100 = impulse at 100 ms; IMP150 = impulse at 150 ms; IMP200 = impulse at 200 ms; 1RM = one-repetition maximum back squat.