passages.id: split_5_test_720_passage
passages.type: progene_text
passages.text: 20 healthy individuals ( mean ( SEM ) age 55.2 ( 2.7 ) years ) and 36 patients with chronic heart failure ( 59.1 ( 2.0 ) years , New York Heart Association class I-IV , anaerobic threshold 11.8 ( 0. 7 ) ml / kg / min , left ventricular ejection fraction 26 ( 2 ) % ) .