Hemodynamic mechanisms of the attenuated blood pressure response to mental stress after a single bout of maximal dynamic exercise in healthy subjects
Braz. j. med. biol. res
;
45(7): 610-616, July 2012. tab
Artigo
em Inglês
| LILACS
| ID: lil-639468
ABSTRACT
To determine the hemodynamic mechanisms responsible for the attenuated blood pressure response to mental stress after exercise, 26 healthy sedentary individuals (age 29 ± 8 years) underwent the Stroop color-word test before and 60 min after a bout of maximal dynamic exercise on a treadmill. A subgroup (N = 11) underwent a time-control experiment without exercise. Blood pressure was continuously and noninvasively recorded by infrared finger photoplethysmography. Stroke volume was derived from pressure signals, and cardiac output and peripheral vascular resistance were calculated. Perceived mental stress scores were comparable between mental stress tests both in the exercise (P = 0.96) and control (P = 0.24) experiments. After exercise, the blood pressure response to mental stress was attenuated (pre 10 ± 13 vs post 6 ± 7 mmHg; P < 0.01) along with lower values of systolic blood pressure (pre 129 ± 3 vs post 125 ± 3 mmHg; P < 0.05), stroke volume (pre 89.4 ± 3.5 vs post 76.8 ± 3.8 mL; P < 0.05), and cardiac output (pre 7.00 ± 0.30 vs post 6.51 ± 0.36 L/min; P < 0.05). Except for heart rate, the hemodynamic responses and the mean values during the two mental stress tests in the control experiment were similar (P > 0.05). In conclusion, a single bout of maximal dynamic exercise attenuates the blood pressure response to mental stress in healthy subjects, along with lower stroke volume and cardiac output, denoting an acute modulatory action of exercise on the central hemodynamic response to mental stress.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Estresse Psicológico
/
Teste de Esforço
/
Hemodinâmica
Limite:
Adulto
/
Feminino
/
Humanos
/
Masculino
Idioma:
Inglês
Revista:
Braz. j. med. biol. res
Assunto da revista:
Biologia
/
Medicina
Ano de publicação:
2012
Tipo de documento:
Artigo
País de afiliação:
Brasil
Instituição/País de afiliação:
Universidade Federal Fluminense/BR
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