PMID- 28894645
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20201001
IS  - 2167-8359 (Print)
IS  - 2167-8359 (Electronic)
IS  - 2167-8359 (Linking)
VI  - 5
DP  - 2017
TI  - Re-examination of the contribution of substrates to energy expenditure during 
      high-intensity intermittent exercise in endurance athletes.
PG  - e3769
LID - 10.7717/peerj.3769 [doi]
LID - e3769
AB  - BACKGROUND: It has been believed that the contribution of fat oxidation to total 
      energy expenditure is becoming negligible at higher exercise intensities (about 
      85% VO(2max)). The aim of the present study was to examine the changes in 
      substrate oxidation during high-intensity interval exercise in young adult men. 
      METHODS: A total of 18 healthy well-trained (aged 19.60 +/- 0.54 years, BMI = 
      22.19 +/- 0.64 kg/m(2), n = 10) and untrained (aged 20.25 +/- 0.41 years, BMI = 
      22.78 +/- 0.38 kg/m(2), n = 8) young men volunteered to participate in this study. 
      After an overnight fast, subjects were tested on a cycle ergometer and completed 
      six 4-min bouts of cycling (at  approximately 80% VO(2max)) with 2 min of rests between 
      intervals. Energy expenditure and the substrate oxidation rate were measured 
      during the experiment by using indirect calorimetry. The blood lactate 
      concentration was collected immediately after each interval workout. RESULTS: The 
      fat oxidation rate during each workout was significantly different between the 
      untrained and the athlete groups (p < 0.05), and the carbohydrate (CHO) oxidation 
      rate during the experiment was similar between groups (p > 0.05). Moreover, 
      lactate concentration significantly increased in the untrained group (p < 0.05), 
      whereas it did not significantly change in the athlete group during the workouts 
      (p > 0.05). Fat contribution to energy expenditure was significantly higher in 
      the athlete group ( approximately 25%) than in the untrained group ( approximately 2%). CONCLUSIONS: The 
      present study indicates that 17 times more fat oxidation was measured in the 
      athlete group compared to the untrained group. However, the athletes had the same 
      CHO oxidation rate as the recreationally active subjects during high-intensity 
      intermittent exercise. Higher fat oxidation rate despite the same CHO oxidation 
      rate may be related to higher performance in the trained group.
FAU - Aslankeser, Zubeyde
AU  - Aslankeser Z
AD  - Faculty of Sports Science, Selcuk University, Konya, Turkey.
FAU - Balci, Sukru Serdar
AU  - Balci SS
AD  - Faculty of Sports Science, Selcuk University, Konya, Turkey.
LA  - eng
PT  - Journal Article
DEP - 20170906
PL  - United States
TA  - PeerJ
JT  - PeerJ
JID - 101603425
PMC - PMC5591632
OTO - NOTNLM
OT  - Endurance athlete
OT  - High-intensity intermittent exercise
OT  - Substrate oxidation
COIS- The authors declare there are no competing interests.
EDAT- 2017/09/13 06:00
MHDA- 2017/09/13 06:01
PMCR- 2017/09/06
CRDT- 2017/09/13 06:00
PHST- 2017/04/13 00:00 [received]
PHST- 2017/08/16 00:00 [accepted]
PHST- 2017/09/13 06:00 [entrez]
PHST- 2017/09/13 06:00 [pubmed]
PHST- 2017/09/13 06:01 [medline]
PHST- 2017/09/06 00:00 [pmc-release]
AID - 3769 [pii]
AID - 10.7717/peerj.3769 [doi]
PST - epublish
SO  - PeerJ. 2017 Sep 6;5:e3769. doi: 10.7717/peerj.3769. eCollection 2017.