Abstract
Maximum phonation time (MPT), which is related to respiratory function, is widely used to evaluate maximum vocal capabilities because its use is non-invasive, quick, and inexpensive (1,2). Patients with chronic heart failure (CHF) have lower peak oxygen uptake (V•O2) values compared with apparently healthy individuals (2,3). We previously found that MPT correlates positively with peak V•O2 in CHF patients, and that peak V•O2 indices decrease with increases in New York Heart Association (NYHA) functional class (2).
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