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Effects of physical fitness on relaxed G-tolerance and the exercise pressor response.
MedLine Citation:
PMID:  23989489     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Fighter pilots are commonly recommended strength training as a means of improving the tolerance to withstand high gravitoinertial (G) loads. Previous studies on the effect of short-term strength-training regimens on G-endurance show equivocal results, with a majority of the studies suggesting improved G-endurance. The mechanisms underlying such improvement are unknown. Presumably, any change in G-tolerance induced by physical training habits should be manifest following long-term training. We also reasoned that during repeated straining maneuvers-as during certain G-endurance protocols-the relaxed G-tolerance and the exercise pressure response may play a significant role in maintaining adequate arterial pressure, and hence that different training modalities might alter G-endurance, by altering the exercise pressor response. Three groups of males were studied, long-term (>6 months) endurance-trained (E; n = 17), strength-trained (S; n = 16) and untrained (U; n = 17) individuals. The pressor response was studied during sustained (40 s) isometric knee extensions at 50 % of the maximal contraction level. Relaxed gradual onset-rate G-tolerance was determined. G-tolerance was similar in the E (4.6 ± 0.5 G), S (4.9 ± 0.8 G) and U (4.6 ± 0.8 G) groups. The mean arterial pressure increase during isometric exercise was higher in the S (36 ± 7 mmHg = mean ± SD) and U (35 ± 16 mmHg) groups than in the E group (28 ± 8 mmHg). The results suggest that relaxed G-tolerance is unaffected by physical training habits, and that the training modality affects the magnitude of the exercise pressor response. However, it seems that the response is blunted by endurance training rather than enhanced by strength training.
Authors:
Roger Kölegård; Igor B Mekjavic; Ola Eiken
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-8-29
Journal Detail:
Title:  European journal of applied physiology     Volume:  -     ISSN:  1439-6327     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2013 Aug 
Date Detail:
Created Date:  2013-8-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Environmental Physiology, School of Technology and Health, Royal Institute of Technology, KTH, Berzelius v 13, S-17 65, Stockholm, Sweden, roger.kolegard@sth.kth.se.
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