Cardiorespiratory adjustments during the accentuation of respiratory sinus arrhythmia: influence from time of maneuver on minute volume, fraction of expired CO 2 , and heart rate variability . Fisioter Pesqui [Internet]. 2016 Mar. 3 [cited 2024 May 18];23(1):68-73. Available from: https://www.revistas.usp.br/fpusp/article/view/115924