title: Plasma Hsp72 is higher in runners with more serious symptoms of exertional heat illness.
abstract: Exertional heat illness is a potentially fatal disorder that primarily affects fit young men. Plasma Hsp72 may be important in the aetiology of this disorder, acting as a danger signal to the organism and leading to an inflammatory response. The aim of this study was to determine whether patients with exertional heat illness following a 14 km run show a difference in their plasma Hsp72 concentration compared with control subjects who completed the event without incident. Patients (n = 22) and controls (n = 7) were all male. The patients were subdivided into two groups, one of which exhibited more serious symptoms indicating neurological impairment such as confusion (n = 13) (CNS) while the other group exhibited mild symptoms (MILD) (n = 9). The CNS group had a higher rectal temperature (T(rec)) compared with the control group (41.0 +/- 0.3 vs. 39.8 +/- 0.2 degrees C, P < 0.05, mean +/- SE). Immediately after the run plasma Hsp72 was higher in the CNS group compared to controls and patients with mild symptoms (37.9, 17.0, and 20.9 ng/ml, respectively, P < 0.005). There was a correlation between plasma Hsp72 and T(rec) measured immediately after the race (r = 0.597, P < 0.001, n = 29). However, core temperature was not the only factor leading to increased plasma Hsp72 immediately post race. Plasma Hsp72 was still higher in CNS patients compared with the control group (P < 0.05) when T(rec )was included as a covariate. In conclusion, plasma Hsp72 was elevated immediately after a 14 km run with higher levels in patients with more serious symptoms of heat illness.
authors.affiliation: School of Exercise and Sport Science, The University of Sydney, PO Box 170, Lidcombe, NSW, 1825 Australia. p.ruell@fhs.usyd.edu.au
authors.forename: P A
authors.initials: PA
authors.lastname: Ruell
authors.forename: M W
authors.initials: MW
authors.lastname: Thompson
authors.forename: K M
authors.initials: KM
authors.lastname: Hoffman
authors.forename: J R
authors.initials: JR
authors.lastname: Brotherhood
authors.forename: D A B
authors.initials: DA
authors.lastname: Richards
mesh_terms: D000328:Adult; D001794:Blood Pressure / Q000502:physiology; D001831:Body Temperature / Q000502:physiology; D050884:HSP72 Heat-Shock Proteins / Q000097:blood*; D006339:Heart Rate / Q000502:physiology; D018882:Heat Stress Disorders / Q000097:blood* / Q000503:physiopathology; D006400:Hematocrit; D006801:Humans; D008297:Male; D012420:Running / Q000502:physiology*
chemical_list: D050884:HSP72 Heat-Shock Proteins