Thermoregulation in hypertensive men exercising in the heat with water ingestion
Hydration is recommended in order to decrease the overload on the cardiovascular system when healthy individuals exercise, mainly in the heat. To date, no criteria have been established for hydration for hypertensive (HY) individuals during exercise in a hot environment. Eight male HY volunteers wit...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Divulgação Científica
2004-03-01
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| Series: | Brazilian Journal of Medical and Biological Research |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000300019 |
| _version_ | 1818940071198326784 |
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| author | G.A. Ribeiro L.O.C. Rodrigues M.C.V. Moreira E. Silami-Garcia M.R.S. Pascoa F.F.O. Camargos |
| author_facet | G.A. Ribeiro L.O.C. Rodrigues M.C.V. Moreira E. Silami-Garcia M.R.S. Pascoa F.F.O. Camargos |
| author_sort | G.A. Ribeiro |
| collection | DOAJ |
| description | Hydration is recommended in order to decrease the overload on the cardiovascular system when healthy individuals exercise, mainly in the heat. To date, no criteria have been established for hydration for hypertensive (HY) individuals during exercise in a hot environment. Eight male HY volunteers without another medical problem and 8 normal (NO) subjects (46 ± 3 and 48 ± 1 years; 78.8 ± 2.5 and 79.5 ± 2.8 kg; 171 ± 2 and 167 ± 1 cm; body mass index = 26.8 ± 0.7 and 28.5 ± 0.6 kg/m²; resting systolic (SBP) = 142.5 and 112.5 mmHg and diastolic blood pressure (DBP) = 97.5 and 78.1 mmHg, respectively) exercised for 60 min on a cycle ergometer (40% of VO2peak) with (500 ml 2 h before and 115 ml every 15 min throughout exercise) or without water ingestion, in a hot humid environment (30ºC and 85% humidity). Rectal (Tre) and skin (Tsk) temperatures, heart rate (HR), SBP, DBP, double product (DP), urinary volume (Vu), urine specific gravity (Gu), plasma osmolality (Posm), sweat rate (S R), and hydration level were measured. Data were analyzed using ANOVA in a split plot design, followed by the Newman-Keuls test. There were no differences in Vu, Posm, Gu and S R responses between HY and NO during heat exercise with or without water ingestion but there was a gradual increase in HR (59 and 51%), SBP (18 and 28%), DP (80 and 95%), Tre (1.4 and 1.3%), and Tsk (6 and 3%) in HY and NO, respectively. HY had higher HR (10%), SBP (21%), DBP (20%), DP (34%), and Tsk (1%) than NO during both experimental situations. The exercise-related differences in SBP, DP and Tsk between HY and NO were increased by water ingestion (P < 0.05). The results showed that cardiac work and Tsk during exercise were higher in HY than in NO and the difference between the two groups increased even further with water ingestion. It was concluded that hydration protocol recommended for NO during exercise could induce an abnormal cardiac and thermoregulatory responses for HY individuals without drug therapy. |
| first_indexed | 2024-12-20T06:33:48Z |
| format | Article |
| id | doaj.art-b09a2e20a46246118b703ea2cb0a0add |
| institution | Directory Open Access Journal |
| issn | 0100-879X 1414-431X |
| language | English |
| last_indexed | 2024-12-20T06:33:48Z |
| publishDate | 2004-03-01 |
| publisher | Associação Brasileira de Divulgação Científica |
| record_format | Article |
| series | Brazilian Journal of Medical and Biological Research |
| spelling | doaj.art-b09a2e20a46246118b703ea2cb0a0add2022-12-21T19:50:03ZengAssociação Brasileira de Divulgação CientíficaBrazilian Journal of Medical and Biological Research0100-879X1414-431X2004-03-0137340941710.1590/S0100-879X2004000300019Thermoregulation in hypertensive men exercising in the heat with water ingestionG.A. RibeiroL.O.C. RodriguesM.C.V. MoreiraE. Silami-GarciaM.R.S. PascoaF.F.O. CamargosHydration is recommended in order to decrease the overload on the cardiovascular system when healthy individuals exercise, mainly in the heat. To date, no criteria have been established for hydration for hypertensive (HY) individuals during exercise in a hot environment. Eight male HY volunteers without another medical problem and 8 normal (NO) subjects (46 ± 3 and 48 ± 1 years; 78.8 ± 2.5 and 79.5 ± 2.8 kg; 171 ± 2 and 167 ± 1 cm; body mass index = 26.8 ± 0.7 and 28.5 ± 0.6 kg/m²; resting systolic (SBP) = 142.5 and 112.5 mmHg and diastolic blood pressure (DBP) = 97.5 and 78.1 mmHg, respectively) exercised for 60 min on a cycle ergometer (40% of VO2peak) with (500 ml 2 h before and 115 ml every 15 min throughout exercise) or without water ingestion, in a hot humid environment (30ºC and 85% humidity). Rectal (Tre) and skin (Tsk) temperatures, heart rate (HR), SBP, DBP, double product (DP), urinary volume (Vu), urine specific gravity (Gu), plasma osmolality (Posm), sweat rate (S R), and hydration level were measured. Data were analyzed using ANOVA in a split plot design, followed by the Newman-Keuls test. There were no differences in Vu, Posm, Gu and S R responses between HY and NO during heat exercise with or without water ingestion but there was a gradual increase in HR (59 and 51%), SBP (18 and 28%), DP (80 and 95%), Tre (1.4 and 1.3%), and Tsk (6 and 3%) in HY and NO, respectively. HY had higher HR (10%), SBP (21%), DBP (20%), DP (34%), and Tsk (1%) than NO during both experimental situations. The exercise-related differences in SBP, DP and Tsk between HY and NO were increased by water ingestion (P < 0.05). The results showed that cardiac work and Tsk during exercise were higher in HY than in NO and the difference between the two groups increased even further with water ingestion. It was concluded that hydration protocol recommended for NO during exercise could induce an abnormal cardiac and thermoregulatory responses for HY individuals without drug therapy.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000300019HypertensionExerciseWater ingestionHeatThermoregulation |
| spellingShingle | G.A. Ribeiro L.O.C. Rodrigues M.C.V. Moreira E. Silami-Garcia M.R.S. Pascoa F.F.O. Camargos Thermoregulation in hypertensive men exercising in the heat with water ingestion Brazilian Journal of Medical and Biological Research Hypertension Exercise Water ingestion Heat Thermoregulation |
| title | Thermoregulation in hypertensive men exercising in the heat with water ingestion |
| title_full | Thermoregulation in hypertensive men exercising in the heat with water ingestion |
| title_fullStr | Thermoregulation in hypertensive men exercising in the heat with water ingestion |
| title_full_unstemmed | Thermoregulation in hypertensive men exercising in the heat with water ingestion |
| title_short | Thermoregulation in hypertensive men exercising in the heat with water ingestion |
| title_sort | thermoregulation in hypertensive men exercising in the heat with water ingestion |
| topic | Hypertension Exercise Water ingestion Heat Thermoregulation |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000300019 |
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