Efeito de uma sessão de flexão de cotovelo isométrica sobre a pressão arterial ambulatorial de hipertensos: um ensaio cruzado
INTRODUCTION: The isometric training may contribute to improve the blood pressure levels in hypertensive individuals. However, the acute effects of the isometric training on ambulatory blood pressure are less known. OBJECTIVE: To analyze the effects of a single session of isometric elbow flexion...
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| Formato: | Dissertação |
| Idioma: | por |
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/26578 |
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| Resumo: | INTRODUCTION: The isometric training may contribute to improve the blood pressure
levels in hypertensive individuals. However, the acute effects of the isometric training on
ambulatory blood pressure are less known. OBJECTIVE: To analyze the effects of a single
session of isometric elbow flexion on ambulatory blood pressure in hypertensive individuals.
METHODS: This is a randomized clinical trial with a crossover design. Twelve inactive
hypertensive individuals (♀= 9; 46.8 ± 7.1 years; 27.2 ± 2.7 kg/m²; resting blood pressure
123.0 ± 11.6 / 74.3 ± 6.0 mm Hg) were submitted to two experimental sessions in a
randomized order with one-week interval: i) isometric elbow flexion (4 x 1 min, 2 min
intervals, 30% of one-repetition maximum at 90º); ii) control session (no exercise). Both
sessions were performed in the morning and lasted for 12 min. Before and until 30 min after
the isometric and control sessions the heart rate variability and blood pressure were measured.
Ambulatory blood pressure was measured during 20 h (awake: 12 h; asleep: 8 h) after the
isometric and control sessions using an ambulatory blood pressure monitoring device.
Systolic, diastolic, and mean blood pressure during the 20 h period were compared between
the conditions using a paired t-test. A statistical significance was set at 5%. RESULTS: There
were no differences in systolic (isometric: 126.1 ± 14.7 vs. control: 125.6 ± 11.4 mm Hg; p =
0.810) and diastolic (isometric: 71.0 ± 8.7 vs. control: 71.3 ± 5.7 mm Hg; p = 0.800) during
the 20 h period. Also, no differences were found in the awake and asleep period between the
isometric and control session (p > 0.05). No changes were found in the heart rate variability
indices (RR interval, SDNN, LF, HF, SampleEN). Regarding the blood pressure there was an
increase in systolic blood pressure immediately after the isometric exercise session compared
to the control session (14,7 mm Hg, IC95% 8,7-20,7, p < 0.05). CONCLUSION: a single
session of isometric elbow flexion does not elicit changes on ambulatory blood pressure in
hypertensive individuals. |
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