Hypohydration and hyperthermia impair neuromuscular control after exercise
Distefano LJ, Casa DJ, Vansumeren MM, Karslo RM, Huggins RA, Demartini JK, Stearns RL, Armstrong LE, Maresh CM
Medicine and science in sports and exercise · 27 citations
Review labels
Neutral facts our review recorded about how this study was done. They describe method, never whether we like the result.
How it was studied
- Design
- Randomized controlled trial (indexed by PubMed)
- Studied in
- People
- Main outcome
- Health markers and function
Who paid for it
- Funding
- Funding not disclosed
Publication
- Published
- 2013-02-01 · Med Sci Sports Exerc · vol. 45 · issue 6 · pp. 1166–1173
- Publisher
- Lippincott Williams & Wilkins
- Cited
- 50 citations · more than 91% of similar papers · 2.9× the field average
- Impact
- Top 10% most cited in its field
- References
- 29 works
- Access
- Paywalled
- Research areas
- Thermoregulation and physiological responses · Exercise and Physiological Responses · Muscle metabolism and nutrition
- Keywords
- Medicine, Treadmill, Analysis of variance, Post-hoc analysis, Anesthesia, Physical therapy, Internal medicine
- MeSH
- humans, dehydration, fatigue, exercise test, exercise, hyperthermia, induced, psychomotor performance, air conditioning, humidity, adolescent, adult, male, postural balance, hot temperature, young adult, healthy volunteers
9 authors
From US
- Lindsay J. DiStefanoUniversity of Connecticut
- Douglas J. CasaUniversity of Connecticut
- MEGAN M. VANSUMERENUniversity of Connecticut
- RACHEL M. KARSLOUniversity of Connecticut
- Robert A. HugginsUniversity of Connecticut
- Julie K. DeMartiniUniversity of Connecticut
Abstract
Purpose
This study aimed to evaluate the effects of hypohydration and hyperthermia during exercise on movement technique and postural control.
Methods
Twelve healthy men (age = 20 ± 2 yr, height = 182 ± 8 cm, mass = 74.0 ± 8.2 kg, V˙O2max = 57.0 ± 6.0 mL·kg·min; mean ± SD) completed four randomized test sessions: euhydrated temperate (EUT), euhydrated hot (EUH), hypohydrated temperate (HYT), and hypohydrated hot (HYH). Temperate and hot conditions were performed in 18.0°C ± 0.2°C, 50.0% ± 3.5% relative humidity, and 34.0°C ± 0.3°C, 45.0% ± 4.5% relative humidity, 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. The 90-min 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-min recovery period after exercise. Repeated-measures ANOVAs 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 with HYT (3.75 ± 1.76) and EUH (3.61 ± 1.71) (P < 0.05). LESS scores remained elevated during REC for HYH compared with 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 the 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.
Abstract via Europe PMC. Copyright remains with the authors or publisher.
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