Reproducibility of pressor response to handgrip: influence of time intervals, strength and duration of exercise.
1. The reproducibility of pressor response to handgrip performed at different time intervals and with different combinations of the product duration x strength of the exercise was evaluated in 14 normotensive subjects recording blood pressure with a noninvasive automatic device. 2. Subjects underwent five consecutive tests (30% of maximal voluntary contraction x 90 s) at 30 min, and 24 h intervals and repeated the test after 12 months. Furthermore, they underwent at 24 h intervals a randomized sequence of handgrip tests whose product strength x duration was combined in order to achieve either a constant or an increasing level of exercise. 3. Blood pressure response to exercise performed at 30 min intervals was much less reproducible than that induced by handgrip performed at time intervals greater than or equal to 24 h. 4. Increasing gradually the product strength x duration of the handgrip test there was a proportional blood pressure increase, whereas when the product was maintained constant diastolic blood pressure increase was also constant and reproducible within each subject. 5. This study shows that it is possible to obtain reproducible diastolic blood pressure responses to handgrip test measuring blood pressure with a non-invasive automatic device when the tests are performed at a time interval of at least 24 h. The choice of the strength and of the duration of the exercise is very important for the reproducibility of the test.
Costa
F V
FV
Cattedra e Servizio di Terapia Medica e Farmacologia Clinica, Policlinico S. Orsola, Università di Bologna, Italy.
Borghi
C
C
Mussi
A
A
Ambrosioni
E
E
D000328:Adult; D001794:Blood Pressure; D003971:Diastole; D005260:Female; D006225:Hand; D006339:Heart Rate; D006801:Humans; D008297:Male; D005082:Physical Exertion; D013599:Systole; D013997:Time Factors