caa a22 4500 467941939 CHVBK 20180406153015.0 cr unu---uuuuu 170328e20060601xx s 000 0 eng 10.1007/s00421-006-0167-z doi (NATIONALLICENCE)springer-10.1007/s00421-006-0167-z Force enhancement at different levels of voluntary contraction in human adductor pollicis [Elektronische Daten] [Ali Oskouei, Walter Herzog] There is substantial evidence that the steady-state isometric force following active muscle stretch is greater than the corresponding isometric force for sub-maximal and maximal electrically induced contractions, and for maximal voluntary contractions (MVC). This so-called force enhancement (FE) has not been investigated systematically for sub-MVC. Recently, we found that FE only occurred in about half of all tested subjects at 30% of MVC in the adductor pollicis muscle, suggesting that FE for voluntary contractions might depend on the level of activation. Therefore, the purpose of this study was to determine if FE during voluntary contractions is associated with activation. We hypothesized that FE increases with increasing levels of activation, and thus increasing levels of effort. Subjects (n=12) performed voluntary contractions of the adductor pollicis using a custom-built dynamometer at 10 and 60% of maximal effort. There was consistent FE in 4 of 12 subjects at 10% and in 10 of 12 subjects at 60% of maximal voluntary effort. Furthermore, the absolute FE increased from 10 to 60% of maximal voluntary effort. The results of this study, together with previous results on the same subject group at 30% and other subjects at 100% of maximal voluntary effort, suggest that FE systematically increases with increasing levels of voluntary contraction. The mechanisms responsible for this increased FE remain unclear. Springer-Verlag, 2006 Force enhancement nationallicence Sub-maximal voluntary contraction nationallicence Muscle activation nationallicence Fiber type nationallicence Oskouei Ali Human Performance Laboratory, University of Calgary, T2N 1N4, Calgary, Alta, Canada aut Herzog Walter Human Performance Laboratory, University of Calgary, T2N 1N4, Calgary, Alta, Canada aut European Journal of Applied Physiology Springer-Verlag 97/3(2006-06-01), 280-287 1439-6319 97:3<280 2006 97 421 https://doi.org/10.1007/s00421-006-0167-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00421-006-0167-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Oskouei Ali Human Performance Laboratory, University of Calgary, T2N 1N4, Calgary, Alta, Canada aut NATIONALLICENCE 700 1- Herzog Walter Human Performance Laboratory, University of Calgary, T2N 1N4, Calgary, Alta, Canada aut NATIONALLICENCE 773 0- European Journal of Applied Physiology Springer-Verlag 97/3(2006-06-01), 280-287 1439-6319 97:3<280 2006 97 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer