PMID- 35045098
OWN - NLM
STAT- MEDLINE
DCOM- 20220221
LR  - 20231105
IS  - 1932-6203 (Electronic)
IS  - 1932-6203 (Linking)
VI  - 17
IP  - 1
DP  - 2022
TI  - Effects of a 12% carbohydrate beverage on tackling technique and running 
      performance during rugby league activity: A randomised, placebo-controlled trial.
PG  - e0262443
LID - 10.1371/journal.pone.0262443 [doi]
LID - e0262443
AB  - The purpose of this study was to investigate the effects of a 12% carbohydrate 
      (CHO) beverage on tackling technique and running performance during rugby league 
      activity. Using a double-blind, placebo-controlled, randomised, crossover design, 
      15 academy rugby league players ingested a 250 ml bolus of a 12% CHO solution (30 
      g maltodextrin and 30 g sucrose in 500 ml) 15 minutes before two bouts of rugby 
      activity. The rugby league match simulation for interchange players was used to 
      standardise the movement patterns of activity and provide reliable outcome 
      measures, whilst also reflecting the duration of a typical field-based 
      conditioning session. Measures of tackling technique, external responses (e.g., 
      fatigue index from sprint data) and rating of perceived exertion (RPE) were 
      recorded throughout. Gut discomfort was measured before each bout. The 
      interaction effect was largely compatible with the hypothesis for relative 
      distance (P<0.001, eta2 = 0.217) and fairly compatible for tackling technique (P = 
      0.068, eta2 = 0.0640). The time effect for tackling technique, relative and 
      high-intensity distance, sprint, and sprint to contact velocity, time at high 
      metabolic power, PlayerLoad, and RPE (all P<0.05; eta2 = 0.131-0.701) was 
      compatible with the hypothesis. Data for tackling technique, relative and 
      high-intensity distance, sprint, and sprint to contact velocity, sprint, and 
      sprint to contact fatigue index (all P<0.05; eta2 = 0.189-0.612) was compatible 
      with a supplement effect overall despite few differences in the pattern of change 
      (interaction). Minimal gut discomfort was reported for the CHO (bout 1 = 27 +/- 17; 
      bout 2 = 23 +/- 17 AU) and placebo (bout 1 = 23 +/- 18 AU; bout 2 = 24 +/- 13) trials. 
      This study shows that a 12% CHO beverage before two bouts of standardised rugby 
      activity is a practical and effective strategy for retaining tackling technique, 
      increasing external responses, and reducing RPE without compromising gut comfort.
FAU - Dobbin, Nick
AU  - Dobbin N
AUID- ORCID: 0000-0001-7508-1683
AD  - Department of Health Professions, Manchester Metropolitan University, Manchester, 
      United Kingdom.
FAU - Richardson, Daniel
AU  - Richardson D
AD  - Department of Health Professions, Manchester Metropolitan University, Manchester, 
      United Kingdom.
AD  - Warrington Wolves Rugby League Club, The Halliwell Jones Stadium, Warrington, 
      United Kingdom.
FAU - Myler, Liam
AU  - Myler L
AD  - Warrington Wolves Rugby League Club, The Halliwell Jones Stadium, Warrington, 
      United Kingdom.
FAU - Esen, Ozcan
AU  - Esen O
AD  - Department of Health Professions, Manchester Metropolitan University, Manchester, 
      United Kingdom.
LA  - eng
PT  - Journal Article
PT  - Randomized Controlled Trial
DEP - 20220119
PL  - United States
TA  - PLoS One
JT  - PloS one
JID - 101285081
RN  - 0 (Dietary Carbohydrates)
SB  - IM
MH  - Adolescent
MH  - Athletes
MH  - Athletic Performance/*physiology
MH  - Beverages
MH  - Dietary Carbohydrates/metabolism/*pharmacology
MH  - Double-Blind Method
MH  - Fatigue
MH  - Heart Rate/physiology
MH  - Humans
MH  - Male
MH  - Physical Exertion/physiology
MH  - Placebo Effect
MH  - Rugby/*physiology
MH  - Running/physiology
MH  - Young Adult
PMC - PMC8769322
COIS- The authors have declared that no competing interests exist
EDAT- 2022/01/20 06:00
MHDA- 2022/02/22 06:00
PMCR- 2022/01/19
CRDT- 2022/01/19 19:28
PHST- 2021/07/14 00:00 [received]
PHST- 2021/12/25 00:00 [accepted]
PHST- 2022/01/19 19:28 [entrez]
PHST- 2022/01/20 06:00 [pubmed]
PHST- 2022/02/22 06:00 [medline]
PHST- 2022/01/19 00:00 [pmc-release]
AID - PONE-D-21-22933 [pii]
AID - 10.1371/journal.pone.0262443 [doi]
PST - epublish
SO  - PLoS One. 2022 Jan 19;17(1):e0262443. doi: 10.1371/journal.pone.0262443. 
      eCollection 2022.