title: Ventilatory threshold and training heart rate in exercising cardiac patients.
abstract: The purpose of this study was to determine the relationship between previously prescribed training heart rates (THR) for patients training for six months or more in a cardiac rehabilitation program (CRP), calculated Karvonen percentage heart rate reserve (THRk), and the ventilatory threshold (VT). In twenty male patients (ages 41-63) with documented coronary heart disease (CAD) [non-medicated] mean training heart rate (THR, 75% HRmax) was determined by a telemetry during training sessions. Incremental treadmill testing for determinations of the gas-exchange VT VOE vs. (VO2, Excess CO2) was performed, and the HR at the VT (VTHR) was determined. VO2max was 35.57 +/- 5.57 mL.kg-1.min-1; the VT, expressed as a percentage of VO2max, was 54.45%. The mean THR (133.8 +/- 13.4 bpm) and calculated THRk (141.1 +/- 9.74 bpm) were significantly greater (p less than .05) than the VTHR (124.8 +/- 15.5 bpm), indicating that VT occurs below intensities determined by other methods.
authors.affiliation: Department of Sports Science, School of Physical Education, University of British Columbia, Vancouver.
authors.forename: L S
authors.initials: LS
authors.lastname: Goodman
authors.forename: D C
authors.initials: DC
authors.lastname: McKenzie
authors.forename: J E
authors.initials: JE
authors.lastname: Taunton
authors.forename: M B
authors.initials: MB
authors.lastname: Walters
mesh_terms: D000328:Adult; D015308:Anaerobic Threshold; D001026:Coronary Artery Bypass; D003327:Coronary Disease / Q000534:rehabilitation*; D003430:Cross-Sectional Studies; D004562:Electrocardiography; D005080:Exercise Test; D005081:Exercise Therapy; D006339:Heart Rate; D006801:Humans; D007590:Jogging; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000534:rehabilitation; D010101:Oxygen Consumption