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Effect of calf muscle circumference size on peak velocity. Voluntarily contraction (n = 10), Geko (n = 3–5), and NUIG (n = 4–5) showed a significant increase on PV in comparison to baseline (n = 10) for calf muscle circumference of <35 cm. For calf muscle of > 35 cm, only voluntarily contraction and NUIG showed a significant change in PV when compared to baseline. (**P < 0.001, ***P < 0.0001 versus baseline, #P < 0.05 versus. NUIG, ∞P < 0.001 versus Geko). Data shown as ± SD.
