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운동자각도를 활용한 간편하고 실용적인 1-RM 추정 방법
장대근(Jang, Dae-Geun),장재근(Jang, Jae-Keun),신성훈(Shin, Sung-Hoon),박승훈(Park, Seung-Hun) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.6
The aim of the study was to propose a simple and practical 1-repetition maximum (RM) estimation method based on the Borg"s rating of perceived exertion (RPE) scale. Since conventional indirect 1-RM estimation methods used monotonous predictive equations disregarding subjects" individual characteristics, they have limits on predictive accuracy. Further they require expensive devices such as bench press and leg press to measure 1-RM using the equations. In order to cope with these problems, the Borg"s RPE scale-based 1-RM estimation method has been proposed. The proposed method first estimates a linear regression equation between the Borg"s RPE and intensity of exercise(e.g., weight for leg press and brake load for cycle ergometer) using the least square method. This makes the 1-RM estimation adaptive to different subjects" individual characteristics. The 1-RM is then estimated by inputting the 20, which is the maximum value of the Borg"s RPE scale, into the regression equation. The proposed method is tested on a database where the intensity of exercise and the RPE are collected simultaneously during the leg press and the cycle ergometer exercises. The results are promising, suggesting that the method provides a simpler but accurate 1-RM estimation in real applications.
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중국 기공 및 쿤달리니 요가 명상이 숙련자의 심박변이율(HRV) 변화에 미치는 영향에 관한 연구
장대근,장재근,박승훈,한민수,Jang, Dae-Geun,Jang, Jae-Keun,Park, Seung-Hun,Hahn, Minsoo 대한의용생체공학회 2012 의공학회지 Vol.33 No.3
In this paper, we have investigated effects of two specific meditations (Chinese qigong meditation and Kundalini yoga meditation) on the heart rate variability (HRV), which is a well-known quantitative measure of autonomic balance, of skilled students. To analyze the effects, the MIT/BIH physionet database was utilized. The database includes RR intervals of eight skilled Chinese qigong meditators (5 women and 3 men; age range 26-35) and four skilled Kundalini yoga meditators (2 women and 2 men; age range 20-52). RR intervals of each subject were measured before and during the meditations. For HRV analysis, we have used typical four HRV parameters - the low frequency to high frequency power ratio (LF/HF ratio), SD2/SD1 ratio, sample entropy, and fractal dimension. The LF/HF ratio was calculated by the autoregressive spectrum and the SD2/SD1 ratio was derived from the Poincar$\grave{e}$ plot. The sample entropy was computed from the phase space plot and the fractal dimension was estimated by the Higuchi's algorithm. In the experiments, the Wilcoxon signed rank test was employed because we used small datasets and compared HRV parameters before and during the meditations. As a result, we have found increment of the LF/HF and SD2/SD1 ratios in both meditations; whereas the sample entropy is decreased during the meditations. In addition, the fractal dimension is increased during the Chinese qigong meditation; whereas it is decreased during the Kundalini yoga meditation. The results show that the sympathetic nervous system is generally more activated in skilled Chinese qigong and Kundalini yoga meditators, but the activation of the parasympathetic nervous tone is suppressed.
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배드민턴동호회 참여자의 운동참여 정도와 감각추구성향이 운동중독에 미치는 영향
정영수(Jung Young-Su),장재근(Jang Jae-Geun),유경호(Yoo Kyoung-Ho) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.4
This study aims to examine the effects of two aspects of exercise addiction: sensation-seeking and participation rate. Research data was collected from 306 subjects attending badminton clubs from S and D areas, through the Sensation Seeking Scale(SSS) and the Exercise Addiction Questionnaire(EAQ). The raw date was then analyzed with the SPSS 15.0 Windows Program, using multiple correlation and multiple regression analysis. The results of this study suggest: (1) that sensation-seeking and participation rate are positively correlated with exercise addiction; (2) that frequency and the time of participation influence exercise addiction significantly; (3) and that the sensation-seeking subcategories Thrill and Adventure Seeking(TAS), Boredom Susceptibility(BS), and Disinhibition(DIS) each have a significant effect on exercise addiction. Moreover, TAS is particularly influential within the subcategories of exercise addiction, namely withdrawal symptoms, the need for exercise, and attractive attachment.
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신성훈 ( Sung Hoon Shin ),장대근 ( Dae Geun Jang ),장재근 ( Jae Keun Jang ),박승훈 ( Seung Hun Park ) 한국운동역학회 2013 한국운동역학회지 Vol.23 No.2
The purpose of this study is to investigate the effect of aging and dual tasking to the postural control during quiet standing. It was hypothesized that the center of pressure (COP) dynamics would be differently affected by aging and characteristics of the task. Total 60 adults (35 young adults and 25 older adults) participated in this study. They conducted two different standing tasks (dual vs. Nondual) twice in a random order. Variability, complexity, coupling and symmetric index from the left, right and overall COPs were measured by various parameters in nonlinear, linear and frequency analyses methods. Results demonstrated that older adults had worse performance in postural control with decreased complexity in overall sway movement, and increased coupling between left and right limb COP movement, even though there was no significant difference in symmetric index. These tendencies are generally clearer in nonlinear measures at the dual task condition. Results implied that older adults had compensatory strategy in dual tasking which results in simple and combined postural movement patterns.
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