Schematic illustration of the measurement protocol.
Participants were randomly allocated to the fixed or the non-fixed measurement condition. After completion of the protocol at both measurement sites on the m. biceps femoris (BF-mid = 50% of BF length (ischial tuberosity to fibula head); BF-distal: 5 cm distal of BF-mid), the subjects received the remaining measurement condition.The TMG measurement itself was performed as follows: starting at 50 mA, the intensity was progressively increased by 10 mA every 30 seconds until maximal displacement or maximal output was reached [