caa a22 4500 467942021 CHVBK 20180406153015.0 cr unu---uuuuu 170328e20060701xx s 000 0 eng 10.1007/s00421-006-0209-6 doi (NATIONALLICENCE)springer-10.1007/s00421-006-0209-6 Excitability of the soleus reflex arc during intensive stretch-shortening cycle exercise in two power-trained athlete groups [Elektronische Daten] [Janne Avela, Jarkko Finni, Paavo Komi] In several explosive types of sport events the leg extensor muscles are subjected to very high impact loads. Thus, extreme requirements exist for the neuromuscular system to develop sufficient muscle stiffness in the lower extremities in order to tolerate these high impact loads. Therefore, it would be challenging to measure reflex modulation during high impact activities, and with different athlete populations. In the present experiment, H-reflex and short latency reflex (M1) sensitivity was measured during drop jump exercises among high jumpers and sprinters. The changes in both reflex peak-to-peak amplitudes showed a significant (P<0.05) reduction towards the end of the exercise for the sprinters. In addition, the same subject group showed a remarkable increase in serum creatine kinase (CK) activity 2h after the jumps. Similar changes could not be observed for the high jumpers. These results clearly indicate different neural adaptation strategies for the two athlete groups. Reduction in H-reflex sensitivity and an increase in CK-activity in sprinters were taken as evidence for presynaptic inhibition, probably induced by substances related to muscle damage. Since high jump training includes more high impact loading, it was assumed that it could lead to some structural adaptation and, thus, prevents exercise induced reflex modification to a certain extent. Springer-Verlag, 2006 Stretch reflex nationallicence H-reflex nationallicence Reflex modulation nationallicence Drop jumps nationallicence Avela Janne Neuromuscular Research Center, Department of Biology of Physical Activity, University of Jyväskylä, 40100, Jyvaskyla, Finland aut Finni Jarkko Neuromuscular Research Center, Department of Biology of Physical Activity, University of Jyväskylä, 40100, Jyvaskyla, Finland aut Komi Paavo Neuromuscular Research Center, Department of Biology of Physical Activity, University of Jyväskylä, 40100, Jyvaskyla, Finland aut European Journal of Applied Physiology Springer-Verlag 97/4(2006-07-01), 486-493 1439-6319 97:4<486 2006 97 421 https://doi.org/10.1007/s00421-006-0209-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00421-006-0209-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Avela Janne Neuromuscular Research Center, Department of Biology of Physical Activity, University of Jyväskylä, 40100, Jyvaskyla, Finland aut NATIONALLICENCE 700 1- Finni Jarkko Neuromuscular Research Center, Department of Biology of Physical Activity, University of Jyväskylä, 40100, Jyvaskyla, Finland aut NATIONALLICENCE 700 1- Komi Paavo Neuromuscular Research Center, Department of Biology of Physical Activity, University of Jyväskylä, 40100, Jyvaskyla, Finland aut NATIONALLICENCE 773 0- European Journal of Applied Physiology Springer-Verlag 97/4(2006-07-01), 486-493 1439-6319 97:4<486 2006 97 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer