Table 2 Pearson’s correlation coefficient comparisons between ankle SNW, mass-specific stress, and mass-specific elastic energy storage and the Achilles tendon moment arm at different speeds.

Variable	Speed	Statistic	R	p-value
SNW	Walk	t₁₄₄ = − 0.796	− 0.066	0.786
	Fast walk	t₉₆ = − 1.051	− 0.107	0.852
	Jog	t₁₀₃ = 0.675	0.066	0.251
	Run	t₈₅ = 3.367	0.343	0.001
	Sprint	t₇₀ = 4.094	0.440	< 0.001
AT stress/BM	Run	t₁₆₅ = − 9.185	− 0.582	< 0.001
AT stress/BM	Sprint	t₁₀₂ = − 5.190	− 0.457	< 0.001
AT tendon energy/BM	Run	t₁₆₅ = − 4.938	− 0.359	< 0.001
AT tendon energy/BM	Sprint	t₁₀₂ = − 2.319	− 0.224	0.011

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