title: Endurance running trial in tropical environment: a blood rheological study.
abstract: OBJECTIVE
  The aim of this study was to clarify whether exercising in a tropical climate induces blood rheology alterations despite ad libitum hydration.
  
  
  METHODS
  Hematological, biochemical and hemorheological changes were investigated in young healthy adults (N = 9 men, 20.7 ± 0.8 yrs) after a 10-km race in hot and humid conditions. Subjects' maximal aerobic abilities were tested using a maximal ramp exercise. Blood was sampled at rest (TR), at the end of the race (TEx), and after 24 hours of recovery (T24). Ad libitum hydration was allowed during the race. Blood viscosity (ηb), red blood cell deformability (EI), aggregation (AI) and disaggregation shear rate (γ) were measured.
  
  
  RESULTS
  Hematocrit, hemoglobin and plasma concentration of chlorine, sodium and potassium did not change in response to exercise. No functional consequence was observed on RBC deformability since EI remained unchanged. Percentages of echinocytes, schizocytes and stomatocytes remained in the subclinical range at all times. AI, γ and ηb did not present change.
  
  
  CONCLUSIONS
  Running exercise in tropical climate with ad libitum hydration does not alter the main rheological properties of blood.
authors.affiliation: Université des Antilles et de la Guyane, Laboratoire ACTES (EA 3596), Département de Physiologie, Guadeloupe, West Indies Inserm U763, Université des Antilles et de la Guyane, Pointe-à-Pitre, France.
authors.forename: Julien
authors.initials: J
authors.lastname: Tripette
authors.forename: Marie-Dominique
authors.initials: MD
authors.lastname: Hardy-Dessources
authors.forename: Eric
authors.initials: E
authors.lastname: Beltan
authors.forename: Alain
authors.initials: A
authors.lastname: Sanouiller
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Bangou
authors.forename: Tawfik
authors.initials: T
authors.lastname: Chalabi
authors.forename: Roger
authors.initials: R
authors.lastname: Chout
authors.forename: Mona
authors.initials: M
authors.lastname: Hedreville
authors.forename: Cédric
authors.initials: C
authors.lastname: Broquere
authors.forename: Danitza
authors.initials: D
authors.lastname: Nebor
authors.forename: Grégory
authors.initials: G
authors.lastname: Dotzis
authors.forename: Olivier
authors.initials: O
authors.lastname: Hue
authors.forename: Philippe
authors.initials: P
authors.lastname: Connes
mesh_terms: D000328:Adult; D001809:Blood Viscosity / Q000502:physiology; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D018056:Hemorheology; D006801:Humans; D008297:Male; D010807:Physical Endurance / Q000502:physiology*; D012420:Running / Q000502:physiology*; D014329:Tropical Climate; D055815:Young Adult