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KMID : 0359420040220020179
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Korean Journal of Sports Medicine
2004 Volume.22 No. 2 p.179 ~ p.188
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Effects of Using Hand-held Weight Device Designed for Rhythmic Swing Movement during Treadmill Walking and Running on Heart Rate, Energy Expenditure and Electromyogram in Shoulder Muscle Groups
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Jeong Il-Gyu
Jeong Sul-Mi
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Abstract
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The purpose of this study was to investigate the effects of using hand-held instrument having a rhythmical trait on the cardio-respiratory variables and EMG activities of swinging arm muscle groups during walking and running exercise on treadmill. Total ten healthy collegiate students participated in this experiment Each subject performed two treadmill exercise without and with holding specially designed instrument with both hands. The total weight of that instrument is 0.95 kg. So, the total weight carried by a subject’ both hand during walking or running on treadmill was 1.9kg. The Modified Bruce Protocol was adopted to collect various physiological parameters. The initial work treadmill speed and %grade were 1.7mph and 10%grade, respectively and thereafter raised the speed to 2.5, 3.4, 4.2, 5.0, 6.0 mph and by 2% of %grade in every stage of 6 minute duration. We collected respiratory parameters every 30 second from automatic respiratory gas analyzer and heart rate every 10second from Telemeter Heart Checker. We also obtained the electromyographic data for one minute before the end of each stage. As the results, from the stage Ⅱ(ordinary walk: 2.5mph and 12%grade) oxygen uptake, energy expenditure, heart rate and rate of muscle recruitment began to increase significantly and the exercise intensity of this stage corresponds to 60～80%HRmax. Futhermore, we found much more rapid and significant increases of cardio-respiratory parameters and the magnitude of iEMG activation at the interval of stage Ⅲ～Ⅳ corresponding to subject’s 66～90%VO2max. These results suggest that using this hand-held weight instrument during walking and running exercise can cause more beneficial stimulation to cardio-respiratory system and additional energy expenditure by inducing more recruitments of shoulder and upper arm muscle group.
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KEYWORD
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Hand-held Weight instrument, Treadmill exercise, iEMG
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