PMID- 27930447
OWN - NLM
STAT- MEDLINE
DCOM- 20190708
LR  - 20220330
IS  - 1533-4287 (Electronic)
IS  - 1064-8011 (Linking)
VI  - 33
IP  - 5
DP  - 2019 May
TI  - Carbohydrate and Caffeine Improves High-Intensity Running of Elite Rugby League 
      Interchange Players During Simulated Match Play.
PG  - 1320-1327
LID - 10.1519/JSC.0000000000001742 [doi]
AB  - Clarke, JS, Highton, J, Close, GL, and Twist, C. Carbohydrate and caffeine 
      improves high-intensity running of elite rugby league interchange players during 
      simulated match play. J Strength Cond Res 33(5): 1320-1327, 2019-The study 
      examined the effects of carbohydrate and caffeine ingestion on simulated rugby 
      league interchange performance. Eight male elite rugby league forwards completed 
      2 trials of a rugby league simulation protocol for interchange players 7 days 
      apart in a randomized crossover design, ingesting either carbohydrate (CHO; 40 
      g.h) or carbohydrate and caffeine (CHO-C) (40 g.h + 3 mg.kg) drink. Movement 
      characteristics, heart rate, ratings of perceived exertion (RPE), and 
      countermovement jump (CMJ) height were measured during the protocol. CHO-C 
      resulted in likely to very likely higher mean running speeds (effect size [ES] 
      0.43-0.75), distance in high-intensity running (ES 0.41-0.64), and mean sprint 
      speeds (ES 0.39-1.04) compared with CHO. Heart rate was possibly to very likely 
      higher (ES 0.32-0.74), and RPE was likely to very likely lower (ES -0.53 to 0.86) 
      with CHO-C. There was a likely trivial to possibly higher CMJ in CHO-C compared 
      with CHO (ES 0.07-0.25). The coingestion of carbohydrate with caffeine has an 
      ergogenic effect to reduce the sense of effort and increase high-intensity 
      running capability that might be used to enhance interchange running performance 
      in elite rugby league players.
FAU - Clarke, Jon S
AU  - Clarke JS
AD  - University of Chester, Chester, United Kingdom.
AD  - Warrington Wolves RLFC, Halliwell Jones Stadium, Warrington, Cheshire.
FAU - Highton, Jamie M
AU  - Highton JM
AD  - University of Chester, Chester, United Kingdom.
FAU - Close, Graeme L
AU  - Close GL
AD  - Research Institute of Sport and Exercise Sciences, Liverpool John Moores 
      University, Liverpool, United Kingdom.
FAU - Twist, Craig
AU  - Twist C
AD  - University of Chester, Chester, United Kingdom.
LA  - eng
PT  - Journal Article
PT  - Randomized Controlled Trial
PL  - United States
TA  - J Strength Cond Res
JT  - Journal of strength and conditioning research
JID - 9415084
RN  - 0 (Dietary Carbohydrates)
RN  - 3G6A5W338E (Caffeine)
SB  - IM
MH  - Athletic Performance/*physiology
MH  - Caffeine/*pharmacology
MH  - Cross-Over Studies
MH  - Dietary Carbohydrates/*pharmacology
MH  - Football/*physiology
MH  - Heart Rate
MH  - Humans
MH  - Male
MH  - Movement
MH  - Physical Exertion/physiology
MH  - Running/*physiology
MH  - Young Adult
EDAT- 2016/12/09 06:00
MHDA- 2019/07/10 06:00
CRDT- 2016/12/09 06:00
PHST- 2016/12/09 06:00 [pubmed]
PHST- 2019/07/10 06:00 [medline]
PHST- 2016/12/09 06:00 [entrez]
AID - 10.1519/JSC.0000000000001742 [doi]
PST - ppublish
SO  - J Strength Cond Res. 2019 May;33(5):1320-1327. doi: 10.1519/JSC.0000000000001742.