PMID- 23274594
OWN - NLM
STAT- MEDLINE
DCOM- 20140203
LR  - 20130520
IS  - 1530-0315 (Electronic)
IS  - 0195-9131 (Linking)
VI  - 45
IP  - 6
DP  - 2013 Jun
TI  - Hypohydration and hyperthermia impair neuromuscular control after exercise.
PG  - 1166-73
LID - 10.1249/MSS.0b013e3182805b83 [doi]
AB  - 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 degrees C +/- 0.2 degrees C, 50.0% +/- 3.5% relative humidity, and 34.0 degrees C +/- 0.3 degrees 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.
FAU - Distefano, Lindsay J
AU  - Distefano LJ
AD  - Human Performance Research Laboratory, Department of Kinesiology, University of 
      Connecticut, Storrs, CT 06269-1110, USA. lindsay.distefano@uconn.edu
FAU - Casa, Douglas J
AU  - Casa DJ
FAU - Vansumeren, Megan M
AU  - Vansumeren MM
FAU - Karslo, Rachel M
AU  - Karslo RM
FAU - Huggins, Robert A
AU  - Huggins RA
FAU - Demartini, Julie K
AU  - Demartini JK
FAU - Stearns, Rebecca L
AU  - Stearns RL
FAU - Armstrong, Lawrence E
AU  - Armstrong LE
FAU - Maresh, Carl M
AU  - Maresh CM
LA  - eng
PT  - Journal Article
PT  - Randomized Controlled Trial
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Med Sci Sports Exerc
JT  - Medicine and science in sports and exercise
JID - 8005433
SB  - IM
MH  - Adolescent
MH  - Adult
MH  - Air Conditioning
MH  - Dehydration/*physiopathology
MH  - Exercise/*physiology
MH  - Exercise Test
MH  - Fatigue/physiopathology
MH  - Healthy Volunteers
MH  - Hot Temperature/*adverse effects
MH  - Humans
MH  - Humidity
MH  - Hyperthermia, Induced/*adverse effects
MH  - Male
MH  - Postural Balance/*physiology
MH  - Psychomotor Performance/*physiology
MH  - Young Adult
EDAT- 2013/01/01 06:00
MHDA- 2014/02/04 06:00
CRDT- 2013/01/01 06:00
PHST- 2013/01/01 06:00 [entrez]
PHST- 2013/01/01 06:00 [pubmed]
PHST- 2014/02/04 06:00 [medline]
AID - 10.1249/MSS.0b013e3182805b83 [doi]
PST - ppublish
SO  - Med Sci Sports Exerc. 2013 Jun;45(6):1166-73. doi: 10.1249/MSS.0b013e3182805b83.