caa a22 4500 467940886 CHVBK 20180406153012.0 cr unu---uuuuu 170328e20060201xx s 000 0 eng 10.1007/s00421-005-0054-z doi (NATIONALLICENCE)springer-10.1007/s00421-005-0054-z Acute changes in muscle activation and leg extension performance after different running exercises in elite long distance runners [Elektronische Daten] [Timo Vuorimaa, Rami Virlander, Pasi Kurkilahti, Tommi Vasankari, Keijo Häkkinen] This study investigated acute changes in muscle activation and muscular power performance after three different running exercises in elite long-distance runners. Twenty-two nationally and internationally ranked long-distance runners performed first an incremental treadmill running test until exhaustion (MR) and then 40min continuous (TR) and intermittent (2min run/2min rest) (IR) running exercises at an intensity of 80 and 100% of the velocity associated with VO2max, respectively. Muscle activation and muscular power performance tests (counter-movement jumps, CMJ, and a set of ten maximal half squats from the static starting position with an extra load of 35% of the subjects,´ one repetition maximum) were performed before and immediately after the runs. The average mechanical power (P) of the half squats was calculated and the root mean square electromyogram (EMGrms) from the vastus lateralis, vastus medialis, gastrocnemius and biceps femoris muscles was recorded simultaneously during the half squat performances. The results showed an acute exercise-induced increase in P (ANOVA time effect, P=0.000) together with a reduction in EMGrms of the knee extensor muscles (ANOVA time effect, P=0.000). However, mechanical P expressed as a relative change within the set decreased after MR. In TR the improvement in P correlated positively with the maximal running performance of the runners (P<0.05), while in IR it correlated negatively (P<0.05). Jumping performance was significantly enhanced after each run (P<0.001, for all) and the improvement correlated negatively with the maximal sprinting speed and maximal jumping height of the runners (P<0.01, for all). It is concluded that in elite long distance runners an intensive prolonged running exercise reduces the surface EMG of the knee extensor muscles, and may lead to a different coordination strategy in leg extension exercises performed into the vertical direction. After continuous type of running the power improvement correlates positively with maximal endurance running capacity, whereas after intermittent type of running it correlates negatively. Springer-Verlag, 2005 Muscle power nationallicence EMG nationallicence Jumping nationallicence Prolonged running nationallicence Fatigue nationallicence Elite runners nationallicence Vuorimaa Timo Sport Institute of Finland, Kaskelantie 10, 19120, Vierumäki, Finland aut Virlander Rami Sport Institute of Finland, Kaskelantie 10, 19120, Vierumäki, Finland aut Kurkilahti Pasi Sport Institute of Finland, Kaskelantie 10, 19120, Vierumäki, Finland aut Vasankari Tommi Sport Institute of Finland, Kaskelantie 10, 19120, Vierumäki, Finland aut Häkkinen Keijo Department of Biology of Physical Activity, University of Jyväskylä, Jyväskylä, Finland aut European Journal of Applied Physiology Springer-Verlag 96/3(2006-02-01), 282-291 1439-6319 96:3<282 2006 96 421 https://doi.org/10.1007/s00421-005-0054-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00421-005-0054-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Vuorimaa Timo Sport Institute of Finland, Kaskelantie 10, 19120, Vierumäki, Finland aut NATIONALLICENCE 700 1- Virlander Rami Sport Institute of Finland, Kaskelantie 10, 19120, Vierumäki, Finland aut NATIONALLICENCE 700 1- Kurkilahti Pasi Sport Institute of Finland, Kaskelantie 10, 19120, Vierumäki, Finland aut NATIONALLICENCE 700 1- Vasankari Tommi Sport Institute of Finland, Kaskelantie 10, 19120, Vierumäki, Finland aut NATIONALLICENCE 700 1- Häkkinen Keijo Department of Biology of Physical Activity, University of Jyväskylä, Jyväskylä, Finland aut NATIONALLICENCE 773 0- European Journal of Applied Physiology Springer-Verlag 96/3(2006-02-01), 282-291 1439-6319 96:3<282 2006 96 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer