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Acute exposure to microgravity does not influence the H-reflex with or without whole body vibration and does not cause vibration-specific changes in muscular activity

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Datum

2013

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Gollhofer, Albert
Ritzmann, Ramona

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http://nbn-resolving.de/urn:nbn:de:bsz:352-232160
DOI (zitierfähiger Link)
https://doi.org/10.1016/j.jelekin.2013.02.010
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Sportwissenschaft: Publikationen
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Journal of Electromyography and Kinesiology. 2013, 23(4), pp. 872-878. ISSN 1050-6411. eISSN 1873-5711. Available under: doi: 10.1016/j.jelekin.2013.02.010

Zusammenfassung

Purpose


Many potential countermeasures for muscle and bone loss caused by exposure to microgravity require an uncompromised stretch reflex system. This is especially true for whole body vibration (WBV), as the main source of the neuromuscular activity during WBV has been attributed to stretch reflexes. A priori, it cannot be assumed that reflexes and Ia afferent transmission in particular have the same characteristics in microgravity as in normal gravity (NG). Therefore, the purpose of the study was to compare Ia afferent transmission in microgravity and NG and to assess how microgravity affects muscle activity during WBV.


Methods


In 14 participants, electromyographic activity of four leg muscles as well as Hoffmann-reflexes were recorded during NG and microgravity induced by parabolic flights.


Results


The size of the Hoffmann-reflex was reduced during WBV, but did not differ during acute exposure to microgravity compared to NG. The influence of the gravity conditions on the electromyographic activity did not change depending on the vibration condition.


Conclusions


As far as the electromyographic activity of the recorded leg muscles is concerned, the effect of WBV is the same in microgravity as in NG. Moreover, Ia afferent transmission does not seem to be affected by acute exposure to microgravity when subjects are loaded with body weight and postural sway is minimized.

Zusammenfassung in einer weiteren Sprache

Fachgebiet (DDC)
796 Sport

Schlagwörter

Space, Muscle loss, Bone loss, Countermeasure, Bed rest, Parabolic flights

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ISO 690KRAMER, Andreas, Albert GOLLHOFER, Ramona RITZMANN, 2013. Acute exposure to microgravity does not influence the H-reflex with or without whole body vibration and does not cause vibration-specific changes in muscular activity. In: Journal of Electromyography and Kinesiology. 2013, 23(4), pp. 872-878. ISSN 1050-6411. eISSN 1873-5711. Available under: doi: 10.1016/j.jelekin.2013.02.010
BibTex
@article{Kramer2013-08Acute-23216,
  year={2013},
  doi={10.1016/j.jelekin.2013.02.010},
  title={Acute exposure to microgravity does not influence the H-reflex with or without whole body vibration and does not cause vibration-specific changes in muscular activity},
  number={4},
  volume={23},
  issn={1050-6411},
  journal={Journal of Electromyography and Kinesiology},
  pages={872--878},
  author={Kramer, Andreas and Gollhofer, Albert and Ritzmann, Ramona}
}
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