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Effect of calf muscle circumference on the ejected volume. For a calf muscle circumference of both < 35 and >35 cm, only voluntarily contraction (n = 10) showed a significant increase in comparison to baseline (n = 10). There was no alteration in NUIG (n = 5) and Geko device (n = 3–4). (*P < 0.05 versus baseline). Data shown as ± SD.
