Hydration status of rugby league players during home match play throughout the 2008 Super League season

O'Hara, John Paul; Jones, Benjamin Lee; Tsakirides, Costas; Carroll, Sean; Cooke, Carlton Brian; King, Roderick Frederick Gerardus Joseph
December 2010
Applied Physiology, Nutrition & Metabolism;Dec2010, Vol. 35 Issue 6, p790
Academic Journal
The hydration status of rugby league players during competitive home match play was assessed throughout the 2008 Super League season. Fourteen players from 2 Super League clubs were monitored (72 observations). On arrival, 2 h prior to kick off, following normal prematch routines, players' body mass were measured following a urine void. Prematch fluid intake, urine output, and osmolality were assessed until kick off, with additional measurements at half time. Fluid intake was also monitored during match play for club B only, and final measurements of variables were made at the end of the match. Mean body mass loss per match was 1.28 ± 0.7 kg (club A, 1.15 kg; club B, 1.40 kg), which would equate to an average level of dehydration of 1.31% (mass loss, assumed to be water loss, expressed as a percentage of body mass), with considerable intra-individual coefficient of variation (CV, 47%). Mean fluid intake for club B was 0.64 ± 0.5 L during match play, while fluid loss was 2.0 ± 0.7 L, with considerable intra-individual CV (51% and 34%, respectively). Mean urine osmolality was 396 ± 252 mosm·kg-1 on arrival, 237 ± 177 mosm·kg-1 prematch, 315 ± 133 mosm·kg-1 at half time, and 489 ± 150 mosm·kg-1 postmatch. Body mass losses were primarily a consequence of body fluid losses not being completely balanced by fluid intake. Furthermore, these data show that there is large inter- and intra-individual variability of hydration across matches, highlighting the need for future assessment of individual relevance. Dans cette étude, on évalue le degré d'hydratation des joueurs de la ligue de rugby au cours de matches à domicile durant la saison 2008 de la « Super League ». À cette fin, on met en observation quatorze joueurs de 2 équipes de cette ligue (72 observations). À l'arrivée sur le terrain, 2 h avant le coup d'envoi et après les routines d'avant-match, on enregistre la masse corporelle des joueurs après une miction. Avant le coup d'envoi, on enregistre la consommation de liquides, la production d'urine et son osmolalité et on reprend les mesures à la mi-temps. De plus, on mesure l'apport de liquides au cours d'un match de l'équipe B et on reprend toutes les mesures à la fin du match. La perte moyenne de masse corporelle par match est de 1,28 ± 0,7 kg (équipe A : 1,15 kg, équipe B : 1,40 kg), ce qui équivaut à un degré moyen de déshydratation de 1,31 % (la perte de masse est en principe une perte d'eau exprimée en pourcentage de la masse corporelle); la variation intra-individuelle est énorme, le coefficient de variation (CV) étant de 47 %. L'apport moyen de liquides de l'équipe B au cours du match est de 0,64 ± 0,5 L et la perte de liquides est de 2,0 ± 0,7 L, mais la variation intra-individuelle est énorme (CV de 51 % et 34 %, respectivement). L'osmolalité moyenne de l'urine est de 396 ± 252 mosm·kg-1 à l'arrivée, de 237 ± 177 mosm·kg-1 avant le match, de 315 ± 133 mosm·kg-1 à la mi-temps et de 489 ± 150 mosm·kg-1 après le match. La perte de masse corporelle est principalement due à la perte de liquides corporels qui n'est pas totalement compensée par l'apport de liquides. De plus, ces observations révèlent une importante variation intra et interindividuelle du degré d'hydratation d'un match à l'autre; les prochaines études devront se pencher sur l'importance de l'hydratation individuelle.


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