Document Detail

Stance width and angle at sea: effects of sea state and body orientation.
MedLine Citation:
PMID:  19817235     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: On land, the distance and angle between the feet in side-by-side stance tend to have characteristic values. Ship motion mandates changes in the control of stance, but there have been no direct assessments of how stance width and angle are controlled at sea. We predicted that participants would adopt a wider stance at sea. METHOD: On two ships, we measured experienced crewmembers' stance width and stance angle during quiet stance when facing forward and when facing athwartship. Each ship was 84 m long and displaced 3500 tons. Measurements were repeated over consecutive days at sea. For one ship, we tested crew-members on land prior to the cruise. RESULTS: On land, stance width (mean = 19.0 cm) and stance angle (mean = 16.19 degrees) were similar to previous reports. At sea, stance width tended to be greater than on land. When facing athwartship on Ship B, changes in stance width across days were correlated with changes in motion of the ship in its surge axis (r = 0.968). Stance angle at sea did not differ from stance angle on land. CONCLUSIONS: The results suggest that preferred stance width is influenced by the fact of being at sea and by the sea state. These variations may be related to the efficiency of postural control on land and at sea. Future research should examine changes in stance width as novices acclimate to life at sea.
Thomas A Stoffregen; Fu-Chen Chen; Yawen Yu; Sebastien Villard
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Aviation, space, and environmental medicine     Volume:  80     ISSN:  0095-6562     ISO Abbreviation:  Aviat Space Environ Med     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-10-12     Completed Date:  2009-11-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7501714     Medline TA:  Aviat Space Environ Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  845-9     Citation Subset:  IM; S    
School of Kinesiology, University of Minnesota, Minneapolis, MN 55455, USA.
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MeSH Terms
Middle Aged
Movement / physiology
Muscle, Skeletal / physiology
Postural Balance / physiology*
Posture / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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