Maximal expiratory pressure and Valsalva manoeuvre do not produce similar cardiovascular responses in healthy men

Autor(es)

Minatel, Vinicius ^[1] ; Takahashi, Anielle C. M. ^[2] ; Perseguini, Natalia Maria ^[1] ; Milan, Juliana Cristina ^[1] ; Castello-Simoes, Viviane ^[1] ; Gomes, Ellen C. ^[1] ; Borghi-Silva, Audrey ^[1] ; Catai, Aparecida Maria ^[1]

Afiliação do(s) autor(es)

^[1] Fed Univ Sao Carlos UFSCar, Dept Phys Therapy, Nucleus Res Phys Exercise, Cardiovasc Phys Therapy Lab, Sao Paulo - Brazil

^[2] Fed Univ Sao Carlos UFSCar, Dept Phys Therapy, Res Lab Hlth Elderly, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Experimental Physiology; v. 101, n. 5, p. 599-611, MAY 1 2016.
• Citações Web of Science: 1

Resumo

The main purpose of this study was to compare the cardiovascular responses between the Valsalva manoeuvre (VM) and maximal expiratory pressure (MEP) and to evaluate the effect of age on these responses. Twenty-eight healthy men were evaluated and divided into two groups, younger (n = 15, 25 +/- 5 years) and middle aged (n = 13, 50 +/- 5 years), and they performed the VM and MEP measurement. The VM consisted of an expiratory effort (40 mmHg) against a manometer for 15 s, and the MEP was performed according to American Thoracic Society guidelines. The cardiovascular responses were analysed at rest, isotime (3 s), peak, nadir and recovery, and the cardiovascular variations (Delta) were calculated as peak or isotime minus resting values. For the statistical analysis, we used two-way ANOVA (P < 0.05). We observed that MEP and the VM generate similar changes in cardiac output (P > 0.05), but MEP presents higher values for mean arterial pressure (MAP(Peak), MAP(Isotime), Delta MAP and Delta MAP(Isotime)) than those observed in the VM (P < 0.05). The execution time of the manoeuvres (VM similar to 15 s and MEP similar to 5 s) appears to be largely responsible for the activation of different physiological mechanisms involved in the cardiovascular control for each manoeuvre, and the intensity of expiratory effort is related to the higher response of MAP and peripheral vascular resistance (PVRIsotime and Delta PVRIsotime) during MEP (P < 0.05). Moreover, it appears that age affects only the heart rate and PVR responses (P < 0.05), which were higher in the young and middle-aged group, respectively. Based on these findings, we can conclude that MEP and the VM do not generate similar cardiovascular responses, except for cardiac output. (AU)

• Processo FAPESP: 10/52070-4 - Novas técnicas para avaliação das alterações das oscilações cardiovasculares com o envelhecimento
• Beneficiário: Aparecida Maria Catai
• Modalidade de apoio: Auxílio à Pesquisa - Regular