EFFECTS OF PRIOR STRENGTH EXERCISE ON THE HEART-RATE OXYGEN-UPTAKE RELATIONSHIP DURING SUBMAXIMAL EXERCISE

Fourteen young males (mean age 26.7 yrs) were tested to determine if t here was an alteration, in the heart rate-oxygen uptake relationship d uring submaximal cycle ergometer exercise following isokinetic strengt h training activity as has been documented following high intensity en durance activity. Results indicated that there was a significant incre ase rate without a concomitant increase in heart oxygen uptake during the first five minutes of submaximal cycle riding at 73% VO2max after heavy strength leg exercise, angular velocity of 30 degrees/second, wh en compared to no prior exercise. This alteration in the heart rate-ox ygen uptake relation is not apparent by 20 minutes of the same submaxi mal exercise despite higher lactate values and greater ratings of perc eived exertion. For individuals using heart rate as a guide to exercis e intensity, the elevated heart rate at five minutes of submaximal exe rcise following heavy strength leg exercise does not exceed the 20 min ute value which is an accurate reflection of energy cost and intensity .