HOMEPRODUCTSCOMPANYCONTACTFAQResearchDictionaryPharmaSign Up FREE or Login

Sodium balance during U. S. football training in the heat: cramp-prone vs. reference players.

Abstract
U. S. football players with a history of heat cramps were evaluated for the effect of physical training, sodium intake, and loss of sweat sodium on whole blood sodium concentration (BNa). Athletes (n=14 males, 24+/-1 y) were recruited and studied based on medical history, age, and position. The reference group (R, n=8 without a cramping history) and cramp-prone group (C, n=6, history of whole-body cramps associated with extensive sweat loss during exercise in the heat) were measured for body mass and BNa (ISTAT) before and after team training of 2.2 h in hot conditions (WBGT=29-32 degrees C). Intake and loss of fluid and sodium were also measured to determine respective acute balance. In R, BNa was stable pre- to post-training (138.9+/-1.8 to 139.0+/-2.0 mmol/L) while it tended to decline in C (137.8+/-2.3 to 135.7+/-4.9 mmol/L), and three subjects in C had BNa values below 135 mmol/L (131.7+/-2.9 mmol/L). C consumed a greater percentage of total fluid as water (p<0.05). Mean sweat sodium concentration was (52.6+/-29.2 mmol/L for C and 38.3+/-18.3 mmol/L for R (p>0.05). Compared to R, C tended to experience a decline in BNa and greater acute sodium imbalance. These changes may place cramp-prone players at greater risks for developing acute sodium deficits during training.
AuthorsC A Horswill, J R Stofan, M Lacambra, T A Toriscelli, E R Eichner, R Murray
JournalInternational journal of sports medicine (Int J Sports Med) Vol. 30 Issue 11 Pg. 789-94 (Nov 2009) ISSN: 1439-3964 [Electronic] Germany
PMID19777422 (Publication Type: Journal Article)
Copyright(c) Georg Thieme Verlag KG Stuttgart . New York.
Chemical References
  • Sodium
Topics
  • Adult
  • Case-Control Studies
  • Dehydration
  • Drinking
  • Football (physiology)
  • Heat Stress Disorders (etiology, metabolism)
  • Humans
  • Male
  • Muscle Cramp (etiology, metabolism)
  • Muscle, Skeletal (metabolism)
  • Sodium (metabolism)
  • Sweat (chemistry)
  • Sweating (physiology)
  • United States
  • Water-Electrolyte Balance (physiology)
  • Young Adult

Join CureHunter, for free Research Interface BASIC access!

Take advantage of free CureHunter research engine access to explore the best drug and treatment options for any disease. Find out why thousands of doctors, pharma researchers and patient activists around the world use CureHunter every day.
Realize the full power of the drug-disease research graph!


Choose Username:
Email:
Password:
Verify Password:
Enter Code Shown: