PMID- 27766133
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20191120
IS  - 1939-795X (Print)
IS  - 1939-795X (Electronic)
IS  - 1939-795X (Linking)
VI  - 9
IP  - 3
DP  - 2016
TI  - The Effect of a Moderately Low and High Carbohydrate Intake on Crossfit 
      Performance.
PG  - 460-470
AB  - CrossFit is a metabolically demanding strength and conditioning method which 
      performance may benefit from a carbohydrate (CHO)-rich diet. This study 
      investigated the effect of three consecutive days of high CHO intake on CrossFit 
      performance and corresponding metabolically -related variables in strength 
      trained individuals. Eighteen subjects with a CHO intake of <6 g/kg/day were 
      randomly assigned into a CHO (n = 9) or control (C) group (n =9) and underwent a 
      9-day training protocol. During days 1, 5, and 9, performance was measured as 
      repetitions completed during a 12 minute CrossFit workout. Oxygen consumption 
      (VO(2)), respiratory exchange ratio (RER), and blood lactate (BL) were also 
      measured. Days 6-8, the CHO group increased CHO intake from <6 g/kg/day to 6-8 
      g/kg/day; the C group maintained their current intake of <6 g/kg/day. On days 6 
      and 7 both groups performed CrossFit workouts followed by a day of rest prior to 
      day 9. There was a significant increase in repetitions completed in both groups 
      in day 9 (vs. means score of day 1 + 5) (p = 0.002), but no differences between C 
      and CHO groups (p = 0.111). However, the CHO group displayed a 15.2 repetition 
      increase (+10.9%) in day 9, compared to 5.7 (+4.2%) by the C group. VO(2), RER, 
      and BL were not influenced by the experimental intervention. Our results suggest 
      that the CrossFit-embraced practice of moderately-low CHO diets may be adequate 
      in CHO during short periods of training, however, given the noted trend, extended 
      training periods may be effected.
FAU - Escobar, Kurt A
AU  - Escobar KA
AD  - Department of Health, Exercise & Sport Sciences, University of New Mexico, 
      Albuquerque, New Mexico, USA.
FAU - Morales, Jacobo
AU  - Morales J
AD  - Department of Kinesiology, California State University, Fresno, Fresno, 
      California, USA.
FAU - Vandusseldorp, Trisha A
AU  - Vandusseldorp TA
AD  - Department of Exercise Science & Sports Management, Kennesaw State University, 
      Kennesaw, Georgia, USA.
LA  - eng
PT  - Journal Article
DEP - 20161001
PL  - United States
TA  - Int J Exerc Sci
JT  - International journal of exercise science
JID - 101513127
PMC - PMC5065325
OTO - NOTNLM
OT  - Nutrition
OT  - anaerobic exercise
OT  - glycogen
OT  - high-intensity exercise
OT  - power
OT  - resistance training
OT  - strength training
EDAT- 2016/10/22 06:00
MHDA- 2016/10/22 06:01
PMCR- 2016/10/01
CRDT- 2016/10/22 06:00
PHST- 2016/10/22 06:00 [pubmed]
PHST- 2016/10/22 06:01 [medline]
PHST- 2016/10/22 06:00 [entrez]
PHST- 2016/10/01 00:00 [pmc-release]
AID - ijes_09_04_460 [pii]
PST - epublish
SO  - Int J Exerc Sci. 2016 Oct 1;9(3):460-470. eCollection 2016.