PMID- 32722454
OWN - NLM
STAT- MEDLINE
DCOM- 20210312
LR  - 20210312
IS  - 2072-6643 (Electronic)
IS  - 2072-6643 (Linking)
VI  - 12
IP  - 8
DP  - 2020 Jul 25
TI  - Ingestion of Carbohydrate Prior to and during Maximal, Sprint Interval Cycling 
      Has No Ergogenic Effect: A Randomized, Double-Blind, Placebo Controlled, 
      Crossover Study.
LID - 10.3390/nu12082223 [doi]
LID - 2223
AB  - Carbohydrate (CHO) ingestion may improve intermittent sprint performance in 
      repeated sprint efforts </=15 s. Yet, evidence for its efficacy on sprint interval 
      durations ~30 s is lacking. The purpose of this study was to investigate the 
      effects of CHO ingestion on maximal sprint interval exercise. Fifteen (n = 15) 
      recreational athletes (13/2 males/females, age 22 +/- 2 years; height 176 +/- 11 cm; 
      mass 76.8 +/- 11.3 kg) volunteered for this randomised, double-blind, 
      placebo-controlled, crossover design. Participants completed two experimental 
      trials (performed 10-days apart) involving the ingestion of an 8% CHO solution or 
      a flavour and appearance-matched placebo (PLA) solution (5 mL/kg/bw), immediately 
      before exercise, and preceding the second interval of four x 30 s bouts of 
      repeated maximal sprint efforts (separated by 3.5 min of passive recovery). Peak 
      and mean power (W) output progressively decreased during the repeated sprints 
      (main effect of time, p < 0.0001), but there were no differences between CHO and 
      PLA during any of the sprints (p > 0.05 for condition main effect and condition x 
      time interaction). Physiological responses (blood lactate, heart rate, oxygen 
      consumption, respiratory exchange ratio and RPE) were also unaltered by CHO 
      ingestion. In conclusion, CHO ingestion does not enhance performance or modulate 
      physiological responses during intermittent maximal, sprint cycling.
FAU - McMahon, Gerard
AU  - McMahon G
AD  - Sport & Exercise Sciences Research Institute, School of Sport, Ulster University, 
      Newtownabbey, Belfast BT37 0QB, UK.
FAU - Thornbury, Aaron
AU  - Thornbury A
AD  - Sport & Exercise Sciences Research Institute, School of Sport, Ulster University, 
      Newtownabbey, Belfast BT37 0QB, UK.
LA  - eng
PT  - Journal Article
PT  - Randomized Controlled Trial
DEP - 20200725
PL  - Switzerland
TA  - Nutrients
JT  - Nutrients
JID - 101521595
RN  - 0 (Dietary Carbohydrates)
RN  - 0 (Performance-Enhancing Substances)
SB  - IM
MH  - Athletic Performance/physiology
MH  - Bicycling/*physiology
MH  - Cross-Over Studies
MH  - Dietary Carbohydrates/*administration & dosage
MH  - *Dietary Supplements
MH  - Double-Blind Method
MH  - Eating/*physiology
MH  - Female
MH  - High-Intensity Interval Training
MH  - Humans
MH  - Male
MH  - Performance-Enhancing Substances/*administration & dosage
MH  - Young Adult
PMC - PMC7468746
OTO - NOTNLM
OT  - anaerobic
OT  - ergogenic aid
OT  - solution
OT  - substrate utilisation
COIS- The authors declare no conflict of interest.
EDAT- 2020/07/30 06:00
MHDA- 2021/03/13 06:00
PMCR- 2020/08/01
CRDT- 2020/07/30 06:00
PHST- 2020/06/12 00:00 [received]
PHST- 2020/07/23 00:00 [revised]
PHST- 2020/07/23 00:00 [accepted]
PHST- 2020/07/30 06:00 [entrez]
PHST- 2020/07/30 06:00 [pubmed]
PHST- 2021/03/13 06:00 [medline]
PHST- 2020/08/01 00:00 [pmc-release]
AID - nu12082223 [pii]
AID - nutrients-12-02223 [pii]
AID - 10.3390/nu12082223 [doi]
PST - epublish
SO  - Nutrients. 2020 Jul 25;12(8):2223. doi: 10.3390/nu12082223.