Mobile Phone의 착용위치에 따른 운동 강도별 에너지소비량과 보행수의 타당성 연구

Abstract

Sedentary lifestyle and a lack of physical activity are critically associated with chronic diseases, mental health and mortality. Many health-related organizations have contributed to improving healthy lifestyle with evidencebased guideline for disease prevention. Simultaneously, since new innovative technology has emerged to promote healthy lifestyle, mobile phone has played a key role in promoting health. Mobile phone installed with a physical movement tracker may motivate and support physical activity effectively. However there is limited research about validity of use of mobile phone in different locations on improvement of physical activities. Thus the purpose of this study was to validate the use of mobile phone at different locations to affect total energy expenditure and steps in different intensity walking exercise. The study population was male students who consent to participate to the study (n=18). Their body composition such as height, weight, total body fat and muscle mass was measured. Oxygen consumption was measured during 5-minute walking/running on a treadmill at the speeds of 4km/h, 6km/h and 8km/h based on the exercise protocol offered by ACSM. Number of steps was assessed from records of steps on the application. A eligible movement tracker that would be used in Iphone 6+ was selected. Mobile phone was equipped at the locations of upper left-arm and a pocket of pants. The study used one-way ANOVA to estimate differences in energy expenditure. A validity test was assessed wtih Pearson’s correlation and Bland & Altman. As a result, there was a significant different of calorie consumption at different intensity (p.05). Oxygen consumption was significantly different only in moderate-intensity walking when putting a phone at upper left-arm. Wearing phone on the upper left-arm showed significantly different number of steps by different intensity of exercise compared to having it in a pocket. In a validation test, two measurements showed a bias with different range of agreement limits. It indicates that different locations of mobile phone are associated with different measurement. The study found that putting a phone in a pocket may assess steps and energy consumption with better accuracy compared to wearing it on the upper arm. It may be explained by arm movement during different intensity activity. Higher intensity exercise moves more arms and legs and it may not show significant differences of energy consumptions and steps at different locations. It also indicates that number of steps showed increased trend as increased speeds of walking/running when putting it in a pocket. The further study is needed to evaluate energy consumption and number of steps in various forms of physical activity. Further study is needed to evaluate energy consumption and number of steps in various forms of physical activity.