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Two Minutes of Sprint Interval Exercise Elicits Similar 24 hour VO2 as 30 Minutes of Continuous Endurance Exercise.
MedLine Citation:
PMID:  22710610     Owner:  NLM     Status:  Publisher    
Six weeks (3 times wk) of sprint interval (SIT) or continuous endurance training (CET) both promote body fat losses despite a substantially lower training volume with SIT (MacPherson, Hazell, Olver, Paterson, & Lemon, 2011). In an attempt to explain these findings we quantified VO2 during and following (24 h) sprint interval exercise (SIE; 2 min exercise) vs continuous endurance exercise (CEE; 30 min exercise). VO2 was measured in male students (n=8) at 8 time points over 24 h under three treatments (SIE, CEE, and control [CTRL, no exercise]). Diet was controlled. VO2 was 150% greater (P<0.01) during CEE vs SIE (87.6±13.1 vs 35.1±4.4 L O2; mean±SD). The observed small difference between average exercise heart rates with CEE (157±10 bpm) and SIE (149±6 bpm) approached significance (P=0.06) as did the difference in peak heart rates during CEE (166±10 bpm) and SIE (173±6 bpm; P=0.14). Total O2 (L O2) consumed over 8 h with CEE (263.3±30.2) was greater (P<0.01) vs both SIE (224.2±15.3; P<0.001) and CTRL (163.5±16.1; P<0.001). Total O2 with SIE was also increased over CTRL (P<0.001). At 24 h, both exercise treatments were increased (P<0.001) vs CTRL (CEE= 500.2±49.2; SIE = 498.0±29.4; CTRL = 400.2±44.6) but there was no difference between CEE and SIE (P=0.99). Despite large differences in exercise O2 consumption, the protracted effects of SIE result in a similar total O2 consumption over 24 h vs CEE indicating that the significant body fat losses observed previously with SIT are partially due to increases in metabolism post-exercise.
Tom J Hazell; T Dylan Olver; Craig D Hamilton; W R Lemon P
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-15
Journal Detail:
Title:  International journal of sport nutrition and exercise metabolism     Volume:  -     ISSN:  1543-2742     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-6-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100939812     Medline TA:  Int J Sport Nutr Exerc Metab     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
The University of Western Ontario, Exercise Nutrition Research Laboratory, School of Kinesiology, Faculty of Health Sciences, London, Ontario, Canada.
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