Azzam H. Haddad, Steven W. Su, Branko G. Celler, Hung T. Nguyen
Interval training · Oxygen uptake · Heart rate.
Interval training is an effective method of improving aerobic function and cardiovascular fitness. Heart rate (HR) and oxygen uptake (VO2) are major indicators of human cardiovascular response to exercises. This study investigates human heart rate as well as oxygen uptake response dynamics to running exercises. Eight healthy male subjects were asked to run on a motor-controlled treadmill under a predefined running protocol. Heart rate and oxygen consumption were monitored and recorded using a COSMED portable gas analyzer (K4b2 , Cosmed). The running protocol was repeated twice by each subject and averaged values were taken of each data set to reduce the influence of various internal and environmental factors on the measurements. Experimental results showed that the time constant of offset exercise for both heart rate and oxygen uptake is longer than that of onset exercise; they also showed that VO2 reached the steady state faster than heart rate for both onset and offset cases. These experimental results will also be used to build an interval training protocol. This study also showed how onset and offset time constants, as well as onset and offset steady state gains of an average VO2 profile can be used to simulate an interval training protocol.
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