Effects of water immersion on soleus neuromuscular parameters

Aquatic rehabilitation is a widely used tool for injury prevention or rehabilitation. The underlying neuromuscular mechanisms during immersion are less known due to methodological issues. The following study main purpose to assess neuromuscular functions and muscle architecture changes within imm...

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Main Author: Jozefiak, Zsolt
Other Authors: Liikuntatieteellinen tiedekunta, Faculty of Sport and Health Sciences, Liikuntabiologian laitos, Department of Biology of Physical Activity, University of Jyväskylä, Jyväskylän yliopisto
Format: Master's thesis
Language:eng
Published: 2017
Subjects:
Online Access: https://jyx.jyu.fi/handle/123456789/52817
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author Jozefiak, Zsolt
author2 Liikuntatieteellinen tiedekunta Faculty of Sport and Health Sciences Liikuntabiologian laitos Department of Biology of Physical Activity University of Jyväskylä Jyväskylän yliopisto
author_facet Jozefiak, Zsolt Liikuntatieteellinen tiedekunta Faculty of Sport and Health Sciences Liikuntabiologian laitos Department of Biology of Physical Activity University of Jyväskylä Jyväskylän yliopisto Jozefiak, Zsolt Liikuntatieteellinen tiedekunta Faculty of Sport and Health Sciences Liikuntabiologian laitos Department of Biology of Physical Activity University of Jyväskylä Jyväskylän yliopisto
author_sort Jozefiak, Zsolt
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description Aquatic rehabilitation is a widely used tool for injury prevention or rehabilitation. The underlying neuromuscular mechanisms during immersion are less known due to methodological issues. The following study main purpose to assess neuromuscular functions and muscle architecture changes within immersed condition. The physical properties of water to the human body are well understood, as well as its effect on the cardiorespiratory system. While the Hoffmann reflex, as a tool to assess neuromuscular changes on dry land is widely examined, it has been rarely used during immersion. The effect of water immersion on muscle behavior is also unknown. In this study control values were recorded in sitting position for one hour on dry land. This recording period was needed to mimic the similar protocol as in water and to compare the two conditions. The dry land recording showed no changes in the recorded parameters over time. Unaltered reflex and muscle architecture parameters on dry land indicate that the changes during immersion are due to the altered environment. During the first 15 minutes of immersion maximal M-wave and muscle thickness decreased significantly. Maximal H/M ratio showed no significant changes in water immersed condition. The decreased potentiation of the muscle due to the architecture changes is reflected by the decreased maximal M-wave; however the unaltered H-reflex indicates background compensatory mechanisms. Possibly the activation of peripheral mechanoceptors and the effect of weightlessness decreased the tonic presynaptic inhibition which leads to compensated H-reflex response. Repeating the protocol showed good reliability of the maximal H/M ratio, and good inter-session reliability of the muscle thickness. The thesis indicates that with adequate precaution, H-reflex and ultrasound recording is possible during prolonged immersed condition, while the results raise the possibility of acute peripheral and central neuromuscular activation during immersion. With the current protocol the precise mechanisms cannot be addressed, it rather raises the importance for future studies to measure muscle architecture and presynaptic inhibition.
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The \nunderlying neuromuscular mechanisms during immersion are less known due to \nmethodological issues. The following study main purpose to assess neuromuscular functions \nand muscle architecture changes within immersed condition. The physical properties of water \nto the human body are well understood, as well as its effect on the cardiorespiratory system. \nWhile the Hoffmann reflex, as a tool to assess neuromuscular changes on dry land is widely \nexamined, it has been rarely used during immersion. The effect of water immersion on \nmuscle behavior is also unknown. In this study control values were recorded in sitting \nposition for one hour on dry land. This recording period was needed to mimic the similar \nprotocol as in water and to compare the two conditions. The dry land recording showed no \nchanges in the recorded parameters over time. Unaltered reflex and muscle architecture \nparameters on dry land indicate that the changes during immersion are due to the altered \nenvironment. During the first 15 minutes of immersion maximal M-wave and muscle \nthickness decreased significantly. Maximal H/M ratio showed no significant changes in water \nimmersed condition. The decreased potentiation of the muscle due to the architecture changes \nis reflected by the decreased maximal M-wave; however the unaltered H-reflex indicates \nbackground compensatory mechanisms. Possibly the activation of peripheral \nmechanoceptors and the effect of weightlessness decreased the tonic presynaptic inhibition \nwhich leads to compensated H-reflex response. Repeating the protocol showed good \nreliability of the maximal H/M ratio, and good inter-session reliability of the muscle \nthickness. 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spellingShingle Jozefiak, Zsolt Effects of water immersion on soleus neuromuscular parameters aquatic therapy immersion electromyography Hoffmann-reflex ultrasonography Biomekaniikka Biomechanics 5012 elektromyografia ultraäänitutkimus vesiliikunta
title Effects of water immersion on soleus neuromuscular parameters
title_full Effects of water immersion on soleus neuromuscular parameters
title_fullStr Effects of water immersion on soleus neuromuscular parameters Effects of water immersion on soleus neuromuscular parameters
title_full_unstemmed Effects of water immersion on soleus neuromuscular parameters Effects of water immersion on soleus neuromuscular parameters
title_short Effects of water immersion on soleus neuromuscular parameters
title_sort effects of water immersion on soleus neuromuscular parameters
title_txtP Effects of water immersion on soleus neuromuscular parameters
topic aquatic therapy immersion electromyography Hoffmann-reflex ultrasonography Biomekaniikka Biomechanics 5012 elektromyografia ultraäänitutkimus vesiliikunta
topic_facet 5012 Biomechanics Biomekaniikka Hoffmann-reflex aquatic therapy electromyography elektromyografia immersion ultrasonography ultraäänitutkimus vesiliikunta
url https://jyx.jyu.fi/handle/123456789/52817 http://www.urn.fi/URN:NBN:fi:jyu-201701241231
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