Are professional young rugby league players eating enough? Energy intake, expenditure and balance during a pre‐season

Abstract

This is a repository copy of Are professional young rugby league players eating enough? Energy intake, expenditure and balance during a pre-season.

Locomotor and collision characteristics by phases of play during the 2017 rugby league World Cup

“…The large CVs for both within-and between-players suggest that weekly exposure to collisions are unlikely to be consistent. Knowledge of this can have specific implications for the planning of the training and recovery process, given the increased energetic demands of collision activity (Costello et al, 2019) and its subsequent relationships with the time course of recovery (McLellan et al, 2011;Twist et al, 2012;Oxendale et al, 2016). Therefore, careful monitoring of the between-match changes in collision activity could be a useful strategy for practitioners to inform modifications to the prescription of training and recovery modalities.…”

“…Rugby league also comprises frequent collision activity, which imposes significant physiological and biomechanical load onto players (Vanrenterghem et al, 2017), thereby increasing perception of effort (Johnston & Gabbett, 2011;Johnston et al, 2014) and energy expenditure (Costello et al, 2019). The majority of research quantifying the characteristics of rugby league competition have failed to account for the interaction between locomotor and collision activity within their analyses, largely due to the requirement for laborious manual coding of collision events via notational analysis (Johnston et al, 2014).…”

Applied Sport Science for Male Age-Grade Rugby Union in England

“…Harris-Benedict [97]). Increased energy expenditures may be apparent due to the metabolic cost of the collision identified in youth rugby league [98].…”

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“…One of the main challenges for bespoke nutritional intervention during this period will be the accurate assessment of daily energy expenditure with a 'one-size fits all' approach being particularly problematic. Rugby players have large inter-individual differences in daily energy expenditure when measured via doubly-labelled water, even when the players appear to be undertaking similar training sessions (▶ Table 1) [106][107][108][109]. This highlights the sub-stantial contribution of activities away from the training ground on total daily energy expenditure, and it is therefore essential that nutritionists attempt in some way to quantify the activities of the day during this period of training restriction.…”