Intra-arterial blood pressure response in hypertensive subjects during low- and high-intensity resistance exercise.
OBJECTIVE
The aim of this study was to describe blood pressure responses during resistance exercise in hypertensive subjects and to determine whether an exercise protocol alters these responses.


BACKGROUND
Resistance exercise has been recommended as a complement for aerobic exercise for hypertensive patients. However, blood pressure changes during this kind of exercise have been poorly investigated in hypertensives, despite multiple studies of normotensives demonstrating significant increases in blood pressure.


METHODS
Ten hypertensive and ten normotensive subjects performed, in random order, two different exercise protocols, composed by three sets of the knee extension exercise conducted to exhaustion: 40% of the 1-repetition maximum (1RM) with a 45-s rest between sets, and 80% of 1RM with a 90-s rest between sets. Radial intra-arterial blood pressure was measured before and throughout each protocol.


RESULTS
Compared with normotensives, hypertensives displayed greater increases in systolic BP during exercise at 80% (+80 +/-3 vs. +62 +/-2 mmHg, P<0.05) and at 40% of 1RM (+75 +/-3 vs. +67 +/-3 mmHg, P<0.05). In both exercise protocols, systolic blood pressure returned to baseline during the rest periods between sets in the normotensives; however, in the hypertensives, BP remained slightly elevated at 40% of 1RM. During rest periods, diastolic blood pressure returned to baseline in hypertensives and dropped below baseline in normotensives.


CONCLUSIONS
Resistance exercise increased systolic blood pressure considerably more in hypertensives than in normotensives, and this increase was greater when lower-intensity exercise was performed to the point of exhaustion.
de Souza Nery
Sandra
S
Laboratório de Hemodinâmica da Atividade Motora, Escola de Educação Física e Esporte, Universidade de São Paulo - São Paulo/SP, Brazil.
Gomides
Ricardo Saraceni
RS
da Silva
Giovanio Vieira
GV
de Moraes Forjaz
Claudia Lucia
CL
Mion
Décio
D
Tinucci
Tais
T
D000328:Adult; D000704:Analysis of Variance; D001158:Arteries / Q000502:physiology; D001794:Blood Pressure / Q000502:physiology*; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D006973:Hypertension / Q000503:physiopathology* / Q000628:therapy; D008297:Male; D008875:Middle Aged; D010807:Physical Endurance / Q000502:physiology; D055070:Resistance Training / Q000379:methods*