caa a22 4500 467940614 CHVBK 20180406153011.0 cr unu---uuuuu 170328e20060101xx s 000 0 eng 10.1007/s00421-005-0053-0 doi (NATIONALLICENCE)springer-10.1007/s00421-005-0053-0 The effect of postactivation potentiation on the mechanomyogram [Elektronische Daten] [Norihiro Shima, Charles Rice, Yoichi Ota, Kyonosuke Yabe] To examine whether postactivation potentiation (PAP) was related to changes in the electromyogram (EMG) and in the mechanomyogram (MMG), evoked twitch torque properties were compared before and after a 10s plantar flexion MVC in ten male subjects. Peak twitch torque (Pt), and the peak acceleration of the twitch torque development (d2 T/dt 2) were measured from electrical tibial nerve stimulation. In addition, from the medial gastrocnemius muscle, peak to peak MMG (p-p MMG) by means of accelerometer, and peak to peak EMG (M-wave) amplitudes were recorded. Immediately (2s) following the MVC there were significant increases in Pt (47%), d2 T/dt 2 (86%), and p-p MMG (70%), but no change in the M-wave. At 2s, 15s, 30s after the MVC, individual percent changes in p-p MMG were significantly and positively correlated with individual percent changes in both Pt and d2 T/dt 2. These results indicate that evoked MMG reflects acute enhanced force output elicited by PAP, and that the increases in twitch contraction properties represent intrinsic mechanical changes of the muscle, that are not associated with electrical changes. Furthermore, measurements of the evoked p-p MMG signal following PAP support the utility of describing the gross lateral movement phase of the MMG signal. Springer-Verlag, 2005 Twitch potentiation nationallicence MMG nationallicence EMG nationallicence Medial gastrocnemius muscle nationallicence Plantar flexion nationallicence Shima Norihiro National Institute of Fitness and Sports, Shiromizu, Kanoya, 891-2393, Kagoshima, Japan aut Rice Charles Canadian Centre for Activity and Aging, School of Kinesiology, Faculty of Health Sciences, The University of Western Ontario, N6A 3K7, London, ON, Canada aut Ota Yoichi Graduate School of Sports and Health Science, Osaka University of Health and Sports Sciences, Asashirodai, Kumatori, 590-0496, Osaka, Japan aut Yabe Kyonosuke Graduate School of Sports and Health Science, Osaka University of Health and Sports Sciences, Asashirodai, Kumatori, 590-0496, Osaka, Japan aut European Journal of Applied Physiology Springer-Verlag 96/1(2006-01-01), 17-23 1439-6319 96:1<17 2006 96 421 https://doi.org/10.1007/s00421-005-0053-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00421-005-0053-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shima Norihiro National Institute of Fitness and Sports, Shiromizu, Kanoya, 891-2393, Kagoshima, Japan aut NATIONALLICENCE 700 1- Rice Charles Canadian Centre for Activity and Aging, School of Kinesiology, Faculty of Health Sciences, The University of Western Ontario, N6A 3K7, London, ON, Canada aut NATIONALLICENCE 700 1- Ota Yoichi Graduate School of Sports and Health Science, Osaka University of Health and Sports Sciences, Asashirodai, Kumatori, 590-0496, Osaka, Japan aut NATIONALLICENCE 700 1- Yabe Kyonosuke Graduate School of Sports and Health Science, Osaka University of Health and Sports Sciences, Asashirodai, Kumatori, 590-0496, Osaka, Japan aut NATIONALLICENCE 773 0- European Journal of Applied Physiology Springer-Verlag 96/1(2006-01-01), 17-23 1439-6319 96:1<17 2006 96 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer