PMID- 29252062
OWN - NLM
STAT- MEDLINE
DCOM- 20180904
LR  - 20180904
IS  - 1555-0273 (Electronic)
IS  - 1555-0265 (Linking)
VI  - 13
IP  - 7
DP  - 2018 Aug 1
TI  - A Carbohydrate Ingestion Intervention in an Elite Athlete Who Follows a 
      Low-Carbohydrate High-Fat Diet.
PG  - 957-960
LID - 10.1123/ijspp.2017-0392 [doi]
AB  - This case study documents the performance of an elite-level, exceptionally 
      well-fat-adapted endurance athlete as he reintroduced carbohydrate (CHO) 
      ingestion during high-intensity training. He had followed a strict low-CHO 
      high-fat (LCHF) diet for 2 y, during which he ate approximately 80 g of CHO per 
      day and trained and raced while ingesting only water. While following this diet, 
      he earned numerous podium finishes in triathlons of various distances. However, 
      he approached the authors to test whether CHO supplementation during exercise 
      would further increase his high-intensity performance without affecting his fat 
      adaptation. This 7-wk n = 1 investigation included a 4-wk habitual LCHF diet 
      phase during which he drank only water during training and performance trials and 
      a 3-wk habitual diet plus CHO ingestion phase (LCHF + CHO) during which he 
      followed his usual LCHF diet but ingested 60 g/h CHO during 8 high-intensity 
      training sessions and performance trials. After each phase, rates of fat 
      oxidation and 30-s sprint, 4-min sprint, 20-km time trial (TT), and 100-km TT 
      performances were measured. Compared with LCHF, 20-km TT time improved by 2.8% 
      after LCHF + CHO, which would be a large difference in competition. There was no 
      change in 30-s sprint power, a small improvement in 4-min sprint power (1.6%), 
      and a small reduction in 100-km TT time (1.1%). The authors conclude that CHO 
      ingestion during exercise was likely beneficial for this fat-adapted athlete 
      during high-intensity endurance-type exercise (4-30 min) but likely did not 
      benefit his short-sprint or prolonged endurance performance.
FAU - Webster, Christopher C
AU  - Webster CC
FAU - Swart, Jeroen
AU  - Swart J
FAU - Noakes, Timothy D
AU  - Noakes TD
FAU - Smith, James A
AU  - Smith JA
LA  - eng
PT  - Case Reports
PT  - Journal Article
DEP - 20180730
PL  - United States
TA  - Int J Sports Physiol Perform
JT  - International journal of sports physiology and performance
JID - 101276430
RN  - 0 (Dietary Carbohydrates)
RN  - 0 (Dietary Fats)
SB  - IM
MH  - Adult
MH  - Athletic Performance/*physiology
MH  - Competitive Behavior/*physiology
MH  - *Diet, High-Fat
MH  - Dietary Carbohydrates/*administration & dosage
MH  - Dietary Fats/administration & dosage/metabolism
MH  - Energy Metabolism
MH  - Humans
MH  - Male
MH  - Oxidation-Reduction
MH  - *Physical Conditioning, Human
MH  - Physical Endurance/physiology
MH  - Running/*physiology
OTO - NOTNLM
OT  - carbohydrate supplementation
OT  - exercise performance
OT  - exercise physiology
OT  - fat-adaptation
OT  - nutrition
EDAT- 2017/12/19 06:00
MHDA- 2018/09/05 06:00
CRDT- 2017/12/19 06:00
PHST- 2017/12/19 06:00 [pubmed]
PHST- 2018/09/05 06:00 [medline]
PHST- 2017/12/19 06:00 [entrez]
AID - 10.1123/ijspp.2017-0392 [doi]
PST - ppublish
SO  - Int J Sports Physiol Perform. 2018 Aug 1;13(7):957-960. doi: 
      10.1123/ijspp.2017-0392. Epub 2018 Jul 30.