Heat and exercise acclimation increases intracellular levels of Hsp72 and inhibits exercise-induced increase in intracellular and plasma Hsp72 in humans
| Autor: | Kenya Paula Moreira Oliveira, Flávio de Castro Magalhães, Fabiano T. Amorim, Edilamar Menezes de Oliveira, Juliana B. Guimarães, Nilo R. V. Lima, Danusa Dias Soares, Luiz Oswaldo Carneiro Rodrigues, Renata Lane de Freitas Passos, Michele Atalla da Fonseca, Angelo Ruediger Pisani Martini, João B. Ferreira-Junior, Milene R. M. Lima |
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| Rok vydání: | 2010 |
| Předmět: |
Adult
Male Hyperthermia medicine.medical_specialty Hot Temperature Acclimatization HSP72 Heat-Shock Proteins Sweating Biology Work rate Biochemistry Body Temperature SWEAT Heart Rate Internal medicine Heat shock protein Heart rate Leukocytes medicine Humans Treadmill Exercise Original Paper Cell Biology medicine.disease FISIOLOGIA Endocrinology Regression Analysis Intracellular |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | In order to verify the effects of heat and exercise acclimation (HA) on resting and exercise-induced expression of plasma and leukocyte heat shock protein 72 (Hsp72) in humans, nine healthy young male volunteers (25.0 ± 0.7 years; 80.5 ± 2.0 kg; 180 ± 2 cm, mean ± SE) exercised for 60 min in a hot, dry environment (40 ± 0°C and 45 ± 0% relative humidity) for 11 days. The protocol consisted of running on a treadmill using a controlled hyperthermia technique in which the work rate was adjusted to elevate the rectal temperature by 1°C in 30 min and maintain it elevated for another 30 min. Before and after the HA, the volunteers performed a heat stress test (HST) at 50% of their individual maximal power output for 90 min in the same environment. Blood was drawn before (REST), immediately after (POST) and 1 h after (1 h POST) HST, and plasma and leukocytes were separated and stored. Subjects showed expected adaptations to HA: reduced exercise rectal and mean skin temperatures and heart rate, and augmented sweat rate and exercise tolerance. In HST1, plasma Hsp72 increased from REST to POST and then returned to resting values 1 h POST (REST: 1.11 ± 0.07, POST: 1.48 ± 0.10, 1 h POST: 1.22 ± 0.11 ng mL−1; p 0.05). HA increased resting levels of intracellular Hsp72 (HST1: 1 ± 0.02 and HST2: 4.2 ± 1.2 density units, p 0.05). Regression analysis showed that the lower the pre-exercise expression of intracellular Hsp72, the higher the exercise-induced increase (R = −0.85, p |
| Databáze: | OpenAIRE |
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