caa a22 4500 469054360 CHVBK 20180323132839.0 cr unu---uuuuu 170328e19920501xx s 000 0 eng 10.1007/BF00705086 doi (NATIONALLICENCE)springer-10.1007/BF00705086 Stimulation frequency and force potentiation in the human adductor pollicis muscle [Elektronische Daten] [S. Small, M. Stokes] Summary: The effect of stimulation frequency on twitch force potentiation was examined in the adductor pollicis muscle of ten normal subjects. The ulnar nerve was supramaximally stimulated at the wrist and isometric twitch force was measured from a 3-Hz train lasting 1 s. Test stimulation frequencies of 5, 10, 20, 25, 30, 40, 50 and 100 Hz were applied for 5 s each in random order (5 min apart) and the twitches (3 Hz) were applied immediately before and after (1 s) the test freuqency and at intervals up to 5 min afterwards (10 s, and 1, 2 and 5 min). Poststimulation twitches were expressed as a percentage of the prestimulation twitch. Low frequency fatigue was not induced by the protocol since the 20: 50 Hz ratio did not alter within each session. The degree of twitch potentiation was frequency dependent, with potentiation increasing up to 50 Hz [mean 173 (SD 16)%] but the effect was markedly less at 100 Hz [mean 133 (SD 25)%,P<0.011 for all subjects. The reduced potentiation at 100 Hz may have occurred due to high frequency fatigue produced by the 100-Hz test stimulation train. The optimal frequency of those examined in the experimental group was 50 Hz but this only produced maximal potentiation in six of the ten subjects and 100 Hz always produced less potentiation. These findings have implications for electrical stimulation of muscle in the clinical setting. Springer-Verlag, 1992 Twitch potentiation nationallicence Contraction-induced potentiation nationallicence Force enhancement nationallicence Small S. Department of Physiotherapy, University of Queensland, Brisbane, Australia aut Stokes M. Royal Hospital and Home, Putney, West Hill, SW15 3SW, London, UK aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/3(1992-05-01), 229-233 0301-5548 65:3<229 1992 65 421 https://doi.org/10.1007/BF00705086 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00705086 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Small S. Department of Physiotherapy, University of Queensland, Brisbane, Australia aut NATIONALLICENCE 700 1- Stokes M. Royal Hospital and Home, Putney, West Hill, SW15 3SW, London, UK aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/3(1992-05-01), 229-233 0301-5548 65:3<229 1992 65 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer