P. T. V. Farinatti, P. P. S. Soares, W. D. Monteiro, A. F. A. Duarte, and L. A. V. de Castro, “ Cardiovascular responses to passive static flexibility exercises are influenced by the stretched muscle mass and the Valsalva maneuver ”, Clinics, vol. 66, no. 3, pp. 459–464, Jan. 2011, doi: 10.1590/S1807-59322011000300017.