Table 2 Correlation coefficients between marathon running performance and triceps surae muscle–tendon morphological characteristics.

Variables	Achilles tendon			Soleus			Lateral gastrocnemius			Medial gastrocnemius
Variables	r	p	95% CI±	r	p	95% CI±	r	p	95% CI±	r	p	95% CI±
Length	− 0.01	0.48	− 0.63 to 0.62	0.34	0.16	− 0.36 to 0.79	0.12	0.36	− 0.54 to 0.69	0.21	0.27	− 0.47 to 0.74
Volume	0.32	0.18	− 0.38 to 0.79	0.55	0.048	0.11 to 0.87	0.06	0.43	− 0.59 to 0.66	0.41	0.11	− 0.28 to 0.82
CSA max	0.65	0.01	0.04 to 0.91	0.57	0.04	0.08 to 0.88	0.05	0.44	− 0.59 to 0.66	0.37	0.14	− 0.33 to 0.81
PCSA	–	–	–	0.77	0.01	0.28 to 0.94	0.36	0.29	− 0.33 to 0.81	0.32	0.35	− 0.37 to 0.79
Fascicle length	–	–	–	− 0.63	0.02	− 0.90 to − 0.01	− 0.26	0.22	− 0.76 to 0.43	− 0.02	0.47	− 0.64 to 0.61

The corresponding p value and 95% confident interval was calculated as well. Bold numbers indicate significant correlations.

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