Document Detail

Hypohydration and Hyperthermia Impair Neuromuscular Control after Exercise.
MedLine Citation:
PMID:  23274594     Owner:  NLM     Status:  Publisher    
PURPOSE: Evaluate the effects of hypohydration and hyperthermia during exercise on movement technique and postural control. METHODS: Twelve healthy males (age=20±2 y, height=182±8 cm, mass=74.0±8.2 kg, VO2max=57.0±6.0 mL·kg·min) completed four randomized test sessions: Euhydrated Temperate (EUT), Euhydrated Hot (EUH), Hypohydrated Temperate (HYT), Hypohydrated Hot (HYH). Temperate and hot conditions were performed in 18.0±0.2°C, 50.0±3.5% relative humidity (RH), and 34.0±0.3°C, 45.0±4.5%rh, respectively. Movement technique and postural control were assessed before exercise (PRE), after exercise (POST), and after recovery (REC). Movement technique was evaluated using the Landing Error Scoring System (LESS). Postural control was assessed using the Balance Error Scoring System (BESS) and center-of-pressure sway velocity (SV) and elliptical sway area (ESA) during a dynamic balance test (DYN). The 90-minute treadmill exercise protocol (1.34-1.78 m·s; 5% grade) required subjects to walk carrying a 20.5-kg rucksack. Subjects sat quietly in the test environment during a 60-minute recovery period following exercise. Repeated measures analyses of variance with a Tukey-HSD post hoc test evaluated differences between time and condition for dependent variables. RESULTS: Exercise during HYH significantly increased LESS scores (PRE:3.72±1.73, POST:4.42±1.75) compared to HYT (3.75±1.76) and EUH (3.61±1.71)(P<0.05). LESS scores remained elevated during REC for HYH compared to EUT (4.39±1.47 vs. 3.47±2.05)(P<0.05). The HYH condition caused the greatest number of BESS errors (P=0.02), largest ESA (P<0.05) and highest SV (P=0.02). Regardless of condition, participants had the most BESS errors (P=0.002) and highest SV (P=0.003) during POST compared with the PRE and REC. CONCLUSIONS: Hypohydration during exercise in the heat impairs neuromuscular control. These findings suggest that physical activity in the heat while dehydrated may affect parameters associated with a higher risk of injury.
Lindsay J Distefano; Douglas J Casa; Megan M Vansumeren; Rachel L Karslo; Robert A Huggins; Julie K Demartini; Rebecca L Stearns; Lawrence E Armstrong; Carl M Maresh
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-27
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-31     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Human Performance Research Laboratory, Department of Kinesiology, University of Connecticut, Storrs, CT.
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