PMID- 27406549
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20160714
LR  - 20160713
IS  - 1028-415X (Print)
IS  - 1028-415X (Linking)
VI  - 1
IP  - 6
DP  - 1998
TI  - Effect of Carbohydrates and Caffeine on Plasma Amino Acids, Neuroendocrine 
      Responses and Performance in Tennis.
PG  - 419-26
LID - 10.1080/1028415X.1998.11747252 [doi]
AB  - Effects of carbohydrate (CHO) and caffeine (CAF) in amounts typically found in 
      sports-drinks on plasma metabolites, neuroendocrine responses and performance in 
      tennis were investigated in 8 skilled players during a 4 h tennis match. In 3 
      trials players ingested a placebo (T I), a CAF (T II) or a CHO (T III) drink 
      during court changeover. Total intake consisted of 2.81 of fluid, supplemented 
      with 243 g CHO or with 364 mg CAF, respectively. Self-perceived 
      "drive/motivation" and post-exercise hitting accuracy were evaluated. Plasma free 
      fatty acids increments were lower after CHO while CAF administration had no 
      effect. In all trials, plasma branched-chain amino acids (BCAA) concentrations 
      decreased as a result of exercise; however, no differences were observed between 
      trials. Plasma free tryptophan (TRP) to BCAA ratio was augmented in T I and T II 
      while no change from basal level was found in T III. Plasma prolactin (PRL) and 
      growth hormone (HGH) concentrations after cessation of exercise were lower in T 
      III compared with T I and T II. No main effect for treatment was found for plasma 
      ACTH, COR and beta-endorphin. Neither supplement affected number of won games. We 
      conclude that CAF ingestion did not affect the plasma large neutral amino acids 
      concentrations, neuroendocrine system responses or tennis performance. Lower 
      plasma free TRP/BCAA ratio induced by CHO occurred concomitant with reduced 
      plasma PRL and HGH concentrations, suggesting that the brain monoaminergic system 
      might be affected if CHO-containing drinks are consumed during tennis match play. 
      However, the data do not point towards an ergogenic value of reduced plasma free 
      TRP/BCAA ratio.
FAU - Struder, H K
AU  - Struder HK
AD  - a Institute of Sports Games, German Sport University , Carl-Diem-Weg 6, 50933 
      Cologne , Germany.
FAU - Ferrauti, A
AU  - Ferrauti A
AD  - a Institute of Sports Games, German Sport University , Carl-Diem-Weg 6, 50933 
      Cologne , Germany.
FAU - Gotzmann, A
AU  - Gotzmann A
AD  - b Institute of Biochemistry, German Sport University , Carl-Diem-Weg 6, 50933 
      Cologne , Germany.
FAU - Weber, K
AU  - Weber K
AD  - a Institute of Sports Games, German Sport University , Carl-Diem-Weg 6, 50933 
      Cologne , Germany.
FAU - Hollmann, W
AU  - Hollmann W
AD  - c Institute of Cardiology and Sports Medicine, German Sport University , 
      Carl-Diem-Weg 6, 50933 Cologne , Germany.
LA  - eng
PT  - Journal Article
PL  - England
TA  - Nutr Neurosci
JT  - Nutritional neuroscience
JID - 100892202
OTO - NOTNLM
OT  - Amino acids
OT  - Central fatigue
OT  - Exercise
OT  - Hormones
OT  - Serotonin
EDAT- 1998/01/01 00:00
MHDA- 1998/01/01 00:01
CRDT- 2016/07/14 06:00
PHST- 2016/07/14 06:00 [entrez]
PHST- 1998/01/01 00:00 [pubmed]
PHST- 1998/01/01 00:01 [medline]
AID - 10.1080/1028415X.1998.11747252 [doi]
PST - ppublish
SO  - Nutr Neurosci. 1998;1(6):419-26. doi: 10.1080/1028415X.1998.11747252.