Publication Date


Advisor(s) - Committee Chair

Dr. Scott Lyons (Director), Dr. Mark Schafer, Dr. Scott Arnett, Dr. Gina Evans

Degree Program

Department of Kinesiology, Recreation and Sport

Degree Type

Master of Science


To regular exercise and a healthy diet, the American Heart Association (AHA) strongly recommends rope jumping, and according to previous studies, rope jumping is considered a very strenuous exercise. Therefore the purpose of this study was to determine the steady state metabolic cost of repetitive jumping on the Digi-Jump machine, and to determine if exercise on this device is more or less strenuous than similar exercise with a jump rope. We also evaluated relative intensity of this type of exercise, based on each person’s VO2max as measured on a treadmill. Twenty – seven subjects completed two trials, one jumping trial at a rate of 120 jumps per minute (JPM) with the jumping height set at .5 inch for 5 min, and one graded exercise test (GXT) using the Bruce protocol. Oxygen uptake (VO2), heart rate (HR), respiratory exchange ratio (RER), and rating perceived exertion (RPE) were measured each minute during each trial. Results of this study indicated that steady state VO2 during the 5 min jump test was reached at the 3rd min (p < .05), therefore we equated all other variables (HR, RE, RPE) steady state to be from 3rd min. Average jumping steady state VO2 was 31.1 ± 5.5 ml/kg/min, while average VO2max was 56.4 ± 12 ml/kg/min, thus steady state VO2 during jumping trial was 57.1% of VO2max. Average jumping steady state HR was 149. 2 ± 20.1 bpm, while mean GXT HR was 184.7 ± 9.9 bpm, thus steady state HR during jumping trial was 80.9% of their maximal HR obtained during GXT. Average jumping steady state RER was .99 ± .6,while average GXT RER was 1.15 ± .07, thus steady state RER during jumping trial was 86%, and average jumping steady state RPE was 13.5 ± 1.5, while average GXT RPE was 17.9 ± 1, thus steady state RPE during jumping trial was 75.2%. These data indicate that jumping is a strenuous activity, even if the trial is done on Digi – Jump machine without rope.


Kinesiology | Psychology of Movement | Sports Studies