(a)

	R 2	Parameter estimate	SE	P value
Age	0.083	−0.486	0.091	<0.001*
BMI	0.009	−0.647	0.187	0.001*
Plantar flexion strength	0.039	0.006	0.002	0.045*

Cumulative R ² = 0.117, BMI: body mass index, *significance set at = P < 0.05.