Simg Summation Exercise

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Participants were 15 athletic males (age: 19.7 ± 1.2 years, height: 1.78 ± 0.1 m, weight: 72.5 ± 11.3 kg).
The textile electrodes were embedded into compression tights (Fig. 1A) to measure muscle activities of Rectus Femoris (RF). The conductive electrodes were woven by silver fibres and each of the electrodes was of 3 cm * 1 cm in size (Fig. 1B). The wires to connect electrodes and hardware were well-fixed in between two layers of the apparel fabric to avoid interference and artefact. sEMG data acquisitioned (sampling frequency: 1000 Hz) were transmitted from the hardware through Wi-Fi to a computer.
The traditional laboratory-based sEMG measurement device with Ag/AgCl electrodes used for comparison was Noraxon Desktop DTS (Noraxon U.S.A., Inc., Scottsdale, U.S.A), with the sampling
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Isometric contraction tests were conducted on a knee extension equipment (HUR Oy, Kokkola, Finland). All the tests were performed in a seated position where the knee angle was fixed at 120°, and there was a force transducer attached to the lever arm at ankle. The force data were displayed real-time on a computer screen so the participants had feedbacks on their force exertion. Each participant performed maximum voluntary contraction (MVC) tests 3 times. Whereafter, 25% MVC tests were performed 5 times in each participant. A one-minute break was guaranteed between each trial to avoid muscle fatigue. The tests were executed twice: the ones measured by textile electrodes, and the ones with traditional Ag/AgCl electrodes, which were placed exactly at the same area as the textile electrodes.
The sEMG data were filtered (10 Hz Highpass), rectified, smoothed (Mean, 100ms), and synchronised with force data. Furthermore, all sEMG data were normalised to individual MVC values respectively, in order to make comparisons. A Bland-Altman Plot was made to show the agreement between textile and Ag/AgCl
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