| Orthostatic hypotension after 10 days of exercise-heat acclimation and 28 hours of sleep loss. | |
| | |
MedLine Citation:
|
PMID: 22462368 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
|
INTRODUCTION: Orthostatic hypotension (OH) occurs among several populations; elevated temperatures increase an individual's susceptibility, whereas the effect of sleep loss (SL) remains inconclusive. The purpose was: 1) to evaluate the effects of 10 d of heat acclimation (HA) and 28 h of SL on OH; and 2) to determine the best measurements to assess OH in clinical and field settings. METHODS: There were 11 men (mean +/- SD; age, 20 +/- 1 yr; mass, 81.7 +/- 12.2 kg) who underwent a repeated measures research design. Before and after 90 min of HA, with the 11th day performed in conjunction with SL, subjects performed a lie-to-stand test where blood pressure (BP), heart rate (HR), and OH signs and symptoms were obtained. RESULTS: OH incidence and intensity, assessed via acute changes in post-exercise systolic BP (SBP), significantly decreased during HA from Day 2 (15 +/- 12 mmHg) to Day 8 (8 +/- 8 mmHg), while SL showed no effect. As OH responses decreased, concomitant HR increases diminished from Day 2 (113 +/- 15 bpm) to Day 8 (103 +/- 14 bpm). Post-exercise lightheadedness, dizziness, and nausea significantly decreased from Day 2 to Day 8, while no changes were associated with SL. CONCLUSIONS: During HA, BP control improved and cardiovascular strain was reduced, along with OH signs and symptoms; mild SL had no measurable effect. Acute HR changes may be explained by decreased cardiac output and increased stroke volume. In clinical settings, SBP delta may indicate the threshold at which OH signs and symptoms arise. In the absence of a sphygmomanometer, HR taken upon standing, or ratings of lightheadedness and dizziness may be used as alternative field expedient techniques. |
| | |
Authors:
|
Paula Y S Poh; Lawrence E Armstrong; Douglas J Casa; Linda S Pescatello; Brendon P McDermott; Holly Emmanuel; Carl M Maresh |
Related Documents
:
|
22413898 - The kinetics of lactate production and removal during whole-body exercise. 16673378 - Effect of partial bladder outlet obstruction on nitrotyrosine levels and their correlat... 7038838 - Exercise-induced proteinuria in children and adolescents. 2325968 - Exercise and incontinence. 2239728 - Atenolol therapy for exercise-induced hypertension after aortic coarctation repair. 17602238 - Energy system contributions in indoor rock climbing. |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Aviation, space, and environmental medicine Volume: 83 ISSN: 0095-6562 ISO Abbreviation: Aviat Space Environ Med Publication Date: 2012 Apr |
Date Detail:
|
Created Date: 2012-04-02 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 7501714 Medline TA: Aviat Space Environ Med Country: United States |
Other Details:
|
Languages: eng Pagination: 403-11 Citation Subset: IM; S |
Affiliation:
|
Human Performance Laboratory, University of Connecticut, Storrs, CT, USA. paula.ys.poh@gmail.com |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Temporal artery Doppler spectrum morphology responses to tilt and LBNP as an early indicator of sync...
Next Document: Victim fragmentation patterns and seat location supplements crash data: American Airlines flight 587...