Several forms of resistance are available for exercise. The present study evaluated the acute cardiovascular responses to fatiguing resistance exercises with accommodating (Acc), variable (Var), and fixed (Fix) resistances as well as with a graded exercise test (GXT). Heart rate (HR), systolic blood pressure (SBP), diastolic blood pressure (DBP), and rate-pressure product (RPP) were directly and continuously recorded during all exercises. Peak heart rates and blood pressures were highest and lowest, respectively, during the GXT. For the resistance exercises, peak cardiovascular values were highest with Acc, followed by Fix and then Var resistance. There were significant differences (p < 0.05) between GXT and the resistance exercises for HR, SBP, and DBP, but not for RPP. There were also significant differences (p < 0.05) between Acc versus Fix and Var resistance for SBP and RPP These data show that cardiovascular stress is increased during resistance exercises and that responses may differ between the various forms of resistance.
(C) 1996 National Strength and Conditioning Association