title: A single bout of high-intensity interval exercise does not increase endothelial or platelet microparticles in stable, physically fit men with coronary heart disease.
abstract: BACKGROUND
  High-intensity interval exercise (HIIE) is gaining in popularity in fitness centres, even among coronary heart disease (CHD) patients. However, whether HIIE can have deleterious acute effects on the vasculature in CHD has not been studied. We hypothesized that when compared with moderate-intensity continuous exercise (MICE), a single bout of HIIE could lead to vascular damage and increasing numbers of circulating endothelial and platelet microparticles (EMPs, PMPs) in stable, physically fit CHD patients.
  
  
  METHODS
  Nineteen male CHD patients (aged 62 ± 11 years) underwent, in random order, a single session of HIIE corresponding to 15-second intervals at 100% of peak power output and 15-second passive recovery intervals, and an isocaloric MICE session. EMPs (CD31+ and/or CD62E+ and CD42b-); PMPs (CD42b+); nitrates and nitrites; prostacycline; and troponin T, cardiac form (cTnT), were measured 10 minutes before exercise and 20 minutes, 24 hours, and 72 hours after both exercise sessions.
  
  
  RESULTS
  EMPs, PMPs, nitrates and nitrites, prostacycline, and cTnT remained unchanged after both HIIE and MICE exercise sessions. Initial EMP concentration correlated inversely with EMP concentration 20 minutes post exercise, irrespective of exercise modality (r = 0.78, P < 0.0001).
  
  
  CONCLUSIONS
  A single HIIE session with very short exercise and passive recovery periods appears safe and does not induce changes to markers of endothelial function. Future studies are required to determine the safety of a long-term HIIE training program.
authors.affiliation: Cardiovascular Prevention Centre, Montreal Heart Institute, Montreal, Québec, Canada; Institut des Maladies Métaboliques et Cardiovasculaires, Institut National de la Santé et de la Recherche Médicale, UMR 1048, Paul Sabatier University, Toulouse, France.
authors.forename: Thibaut
authors.initials: T
authors.lastname: Guiraud
authors.forename: Mathieu
authors.initials: M
authors.lastname: Gayda
authors.forename: Martin
authors.initials: M
authors.lastname: Juneau
authors.forename: Laurent
authors.initials: L
authors.lastname: Bosquet
authors.forename: Philippe
authors.initials: P
authors.lastname: Meyer
authors.forename: Gabriel
authors.initials: G
authors.lastname: Théberge-Julien
authors.forename: Michel
authors.initials: M
authors.lastname: Galinier
authors.forename: Anna
authors.initials: A
authors.lastname: Nozza
authors.forename: Jean
authors.initials: J
authors.lastname: Lambert
authors.forename: Eric
authors.initials: E
authors.lastname: Rhéaume
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Tardif
authors.forename: Anil
authors.initials: A
authors.lastname: Nigam
mesh_terms: D015415:Biomarkers / Q000097:blood; D001792:Blood Platelets / Q000378:metabolism*; D003327:Coronary Disease / Q000097:blood / Q000503:physiopathology / Q000534:rehabilitation*; D004730:Endothelium, Vascular / Q000378:metabolism*; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D006801:Humans; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption / Q000502:physiology*
chemical_list: D015415:Biomarkers