The effect of passive dehydration on postural sway in healthy adult males

Hdl Handle:
http://hdl.handle.net/10149/92333
Title:
The effect of passive dehydration on postural sway in healthy adult males
Authors:
Wilson, M. L. (Marjorie); Lawther, A. (Alison)
Affiliation:
University of Teesside
Citation:
Wilson, M. L. and Lawther, A. (2008) 'The effect of passive dehydration on postural sway in healthy adult males', Medicine & Science in Sports & Exercise, 40 (5), Supplement S75.
Publisher:
American College of Sports Medicine
Journal:
Medicine & Science in Sports & Exercise
Issue Date:
May-2008
URI:
http://hdl.handle.net/10149/92333
DOI:
10.1249/01.mss.0000321772.47112.51
Abstract:
Purpose: Falls are implicated in 19-30% of accidents in fire fighters and miners, with loss of postural control as a possible causal factor. Both occupations can involve extremes of heat. Inadequate fluid intake can lead to hypohydration. Previous studies have looked at fatiguing activity to induce hypohydration. The purpose of this study was 1) to determine if passive hypohydration has a substantial effect on static postural stability in healthy adult males and 2) to determine if urine specific gravity (Usg) correlates with postural stability. Method: 12 healthy adult males (Mean ± SD, Age 22 ± 0.7 yrs, height 175.7 ± 9.4 cm, mass 77.0 ± 8.8 kg) consented to take part. Subjects were tested on two occasions separated by 7 days. Baseline measures were determined: nude body mass; the range of medial-lateral (ML) and anterior-posterior (AP) Centre of Pressure (COP) with eyes open and eyes closed using a Kistler Force platform; (Usg) using a digital refractometer. On the first visit (Dehydration, DE), subjects were passively dehydrated to 3% Body Mass Loss (BML) in an environmental chamber (40°C, 70% relative humidity). The Usg and COP readings were recorded at 3% BML. On the second visit (Control, CON) subjects were exposed to the same environmental conditions but consumed volumes of water equivalent to those lost in sweat in the initial DE trial to maintain body weight. The Usg and COP readings were taken at the same time-points for each subject as during initial DE trial. Results: The mean difference in ML postural stability between the DE and CON conditions was -8.61 mm (90% CI, -5.05 to -12.17 mm). The mean difference in AP postural stability between the DE and CON conditions was -7.57 mm (90% CI, -4.31 to -10.83 mm). The mean difference in ML postural stability between eyes open and eyes closed was -1.18 mm (90% CI, 3.57 to -5.92 mm). The mean difference in AP postural stability between the eyes open and eyes closed was -3.50 mm (90% CI, -0.25 to -7.24 mm). No substantial correlations were observed between Usg and ML or AP COP ranges. Conclusion: Passive dehydration of 3% BML has a small effect on ML and AP postural stability COP range. Stability appeared to be better for the DE trial (hypohydrated subjects) relative to the CON trial (euhydrated subjects). The Usg does not correlate substantially with COP range measures of postural stability.
Type:
Article
Language:
en
Keywords:
passive dehydration; postural sway; adults; males; falls
ISSN:
0195-9131
Rights:
Author can archive post-print (ie final draft post-refereeing). For full details see http://www.sherpa.ac.uk/romeo/ [Accessed 17/02/2010]
Citation Count:
0 [Web of Science and Scopus, 17/02/2010]

Full metadata record

DC FieldValue Language
dc.contributor.authorWilson, M. L. (Marjorie)en
dc.contributor.authorLawther, A. (Alison)en
dc.date.accessioned2010-02-17T08:53:12Z-
dc.date.available2010-02-17T08:53:12Z-
dc.date.issued2008-05-
dc.identifier.citationMedicine & Science in Sports & Exercise; 40 (5): S75en
dc.identifier.issn0195-9131-
dc.identifier.doi10.1249/01.mss.0000321772.47112.51-
dc.identifier.urihttp://hdl.handle.net/10149/92333-
dc.description.abstractPurpose: Falls are implicated in 19-30% of accidents in fire fighters and miners, with loss of postural control as a possible causal factor. Both occupations can involve extremes of heat. Inadequate fluid intake can lead to hypohydration. Previous studies have looked at fatiguing activity to induce hypohydration. The purpose of this study was 1) to determine if passive hypohydration has a substantial effect on static postural stability in healthy adult males and 2) to determine if urine specific gravity (Usg) correlates with postural stability. Method: 12 healthy adult males (Mean ± SD, Age 22 ± 0.7 yrs, height 175.7 ± 9.4 cm, mass 77.0 ± 8.8 kg) consented to take part. Subjects were tested on two occasions separated by 7 days. Baseline measures were determined: nude body mass; the range of medial-lateral (ML) and anterior-posterior (AP) Centre of Pressure (COP) with eyes open and eyes closed using a Kistler Force platform; (Usg) using a digital refractometer. On the first visit (Dehydration, DE), subjects were passively dehydrated to 3% Body Mass Loss (BML) in an environmental chamber (40°C, 70% relative humidity). The Usg and COP readings were recorded at 3% BML. On the second visit (Control, CON) subjects were exposed to the same environmental conditions but consumed volumes of water equivalent to those lost in sweat in the initial DE trial to maintain body weight. The Usg and COP readings were taken at the same time-points for each subject as during initial DE trial. Results: The mean difference in ML postural stability between the DE and CON conditions was -8.61 mm (90% CI, -5.05 to -12.17 mm). The mean difference in AP postural stability between the DE and CON conditions was -7.57 mm (90% CI, -4.31 to -10.83 mm). The mean difference in ML postural stability between eyes open and eyes closed was -1.18 mm (90% CI, 3.57 to -5.92 mm). The mean difference in AP postural stability between the eyes open and eyes closed was -3.50 mm (90% CI, -0.25 to -7.24 mm). No substantial correlations were observed between Usg and ML or AP COP ranges. Conclusion: Passive dehydration of 3% BML has a small effect on ML and AP postural stability COP range. Stability appeared to be better for the DE trial (hypohydrated subjects) relative to the CON trial (euhydrated subjects). The Usg does not correlate substantially with COP range measures of postural stability.en
dc.language.isoenen
dc.publisherAmerican College of Sports Medicineen
dc.rightsAuthor can archive post-print (ie final draft post-refereeing). For full details see http://www.sherpa.ac.uk/romeo/ [Accessed 17/02/2010]en
dc.subjectpassive dehydrationen
dc.subjectpostural swayen
dc.subjectadultsen
dc.subjectmalesen
dc.subjectfallsen
dc.titleThe effect of passive dehydration on postural sway in healthy adult malesen
dc.typeArticleen
dc.contributor.departmentUniversity of Teessideen
dc.identifier.journalMedicine & Science in Sports & Exerciseen
ref.citationcount0 [Web of Science and Scopus, 17/02/2010]en
or.citation.harvardWilson, M. L. and Lawther, A. (2008) 'The effect of passive dehydration on postural sway in healthy adult males', Medicine & Science in Sports & Exercise, 40 (5), Supplement S75.-
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