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Eur J Appl Physiol. 2018 Jun;118(6):1169-1177. doi: 10.1007/s00421-018-3846-7. Epub 2018 Mar 22.

Collision activity during training increases total energy expenditure measured via doubly labelled water.

Author information

1
Carnegie School of Sport, Institute for Sport, Physical Activity and Leisure, Leeds Beckett University, Leeds, UK. N.Costello@leedsbeckett.ac.uk.
2
Leeds Rhinos RLFC, Leeds, UK. N.Costello@leedsbeckett.ac.uk.
3
Carnegie School of Sport, Institute for Sport, Physical Activity and Leisure, Leeds Beckett University, Leeds, UK.
4
Stable Isotope Biochemistry Laboratory, Scottish Universities Environmental Research Centre, Rankine Avenue, Scottish Enterprise Technology Park, East Kilbride, Scotland, UK.
5
Queen Ethelburga's School, York, UK.
6
Leeds Rhinos RLFC, Leeds, UK.
7
Yorkshire Carnegie RUFC, Leeds, UK.
8
The Rugby Football League, Leeds, UK.

Abstract

PURPOSE:

Collision sports are characterised by frequent high-intensity collisions that induce substantial muscle damage, potentially increasing the energetic cost of recovery. Therefore, this study investigated the energetic cost of collision-based activity for the first time across any sport.

METHODS:

Using a randomised crossover design, six professional young male rugby league players completed two different 5-day pre-season training microcycles. Players completed either a collision (COLL; 20 competitive one-on-one collisions) or non-collision (nCOLL; matched for kinematic demands, excluding collisions) training session on the first day of each microcycle, exactly 7 days apart. All remaining training sessions were matched and did not involve any collision-based activity. Total energy expenditure was measured using doubly labelled water, the literature gold standard.

RESULTS:

Collisions resulted in a very likely higher (4.96 ± 0.97 MJ; ES = 0.30 ± 0.07; p = 0.0021) total energy expenditure across the 5-day COLL training microcycle (95.07 ± 16.66 MJ) compared with the nCOLL training microcycle (90.34 ± 16.97 MJ). The COLL training session also resulted in a very likely higher (200 ± 102 AU; ES = 1.43 ± 0.74; p = 0.007) session rating of perceived exertion and a very likely greater (- 14.6 ± 3.3%; ES = - 1.60 ± 0.51; p = 0.002) decrease in wellbeing 24 h later.

CONCLUSIONS:

A single collision training session considerably increased total energy expenditure. This may explain the large energy expenditures of collision-sport athletes, which appear to exceed kinematic training and match demands. These findings suggest fuelling professional collision-sport athletes appropriately for the "muscle damage caused" alongside the kinematic "work required".

KEYWORDS:

Contact; Nutrition; Recovery; Rugby

PMID:
29569055
PMCID:
PMC5966477
DOI:
10.1007/s00421-018-3846-7
[Indexed for MEDLINE]
Free PMC Article

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