Sodium balance during U.S. football training in the heat : cramp-prone vs. reference players
Deutscher übersetzter Titel: | Das Natriumgleichgewicht während eines American Footballtrainings in der Hitze : krampfgefährdete Spieler versus Vergleichsspieler |
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Autor: | Horswill, C.A.; Stofan, J.R.; Lacambra, M.; Toriscelli, T.A.; Eichner, E.R.; Murray, R. |
Erschienen in: | International journal of sports medicine |
Veröffentlicht: | 30 (2009), 11, S. 789-794, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource Elektronische Ressource (online) |
Sprache: | Englisch |
ISSN: | 0172-4622, 1439-3964 |
DOI: | 10.1055/s-0029-1234056 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU200912008104 |
Quelle: | BISp |
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°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. Verf.-Referat