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임신 기간 및 출산 후의 임산부 보행의 역학적 에너지 변화
하종규 ( Chong Ku Hah ),이재훈 ( Jae Hoon Yi ) 한국운동역학회 2010 한국운동역학회지 Vol.20 No.4
The purpose of this study was to compare pregnant women`s gait parameters and mechanical energies caused by changes in hormone levels and anatomical features such as body mass, body-mass distribution, joint laxity, and musculo-tendinous strength from pregnancy to postpartum. Ten subjects (height: 161±6.5cm, mass: 62.7±10.4 kg, 66.4±9.3 kg, 68.4±7.7 kg, 57.2±7.7 kg) participated in the four times experiments (the first, middle, last term and after birth) and walked ten trials at a self-selected pace without shoes. The gait motions were captured with Qualisys system and gait parameters were calculated with Visual-3D. Pregnant women`s gait velocities were decreased during the pregnancy periods, but increased after birth. Stride width and cycle time were increased during pregnancy, but decreased after birth. Thigh energy (77.4%) was greater than shank energy (19.06%) or feet (3.54%) about total energy of the lower limbs. Their feet (Left R2=0.881, Right R2=0.852) and shank (Left R2=0.318, Right R2=0.226) energies were significantly increased (positive correlation), but double limb stance time (DLST, R2=0.679) and body total energy (R2=0.138) were decreased (negative correlation) for their velocities. These differences suggest that thigh segment may be a dominant segment among lower limbs, and have something to do with gait velocities. Further studies should investigate joint power and joint work to find energy dissipation or absorption from pregnancy period to postpartum.
조도 변화가 여성노인의 보행 표준시간과 하지 관절파워에 미치는 영향
하종규 ( Chong Ku Hah ),이재훈 ( Jae Hoon Yi ),양정훈 ( Jeong Hoon Yang ),서욱현 ( Uk Hyeon Seo ) 한국운동역학회 2014 한국운동역학회지 Vol.24 No.2
The purpose of this study was to investigate walking standard time and joint powers of the lower extremities on the changes of illuminations in the elderly women. Ten older women (70.90±3.28 years, 154.70±3.47 cm, 53.80±5.39 kg) with normal vision and no gait disabilities participated in this study. All the experiments were performed on a level walkway from low to high lighting (six conditions). A 3-dimensional motion capturing system, force-plate, and EMG were used to acquire and analyze walking motion, force, and muscle activity data; the sampling frequency was 100 Hz, 1000 Hz and 1000 Hz respectively. To test the differences on walking standard time and joint powers of the lower extremities between the six lighting conditions, one-way repeated ANOVAs were evaluated. The following results were drawn: First, mean standard time was about 1.3 sec/stride, and velocities were smaller with lighting increasing except 100 Lx. Second, the joint power patterns of ankle and knee were not consistent, but only hip joint power was a greatest in 6 Lx and a smallest in 400 Lx. Third, standard times(100 Lx<300 Lx, 400 Lx) were statistically significant, and hip joint max powers (100 Lx>others) were also statistically significant. But ankle and knee joint max power were not statistically significant. These results showed that standard times from low to high lighting were not consistent, and hip joint of 100 Lx has a greatest rotational torque. We suggested that gait strategies of them as to changing illuminations were not consistent and findings may represent a lack of adaptability in the elderly women.
하종규(Hah Chong-Ku),유성종(Yu Seong-Jong) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.4
Rett‘s syndromeis caused by sporadic mutations in the gene MECP2 located on the X chromosome. It almost exclusively affects girls fetuses with the disorder rarely survive to term. Development is typically normal until 6-18months, when language and motor milestones regress, purposeful hand use is lost and acquired deceleration in the rate of head growth (result in ginmicrocephaly in some) is seen. Rett syndrome is usually caused (95% or more) by a de novo mutation in the child (so it is inherited from a genotypically normal mother, i.e. without a MECP2 mutation). The purpose of this paper is to evaluate moments(flexion/extension) of girl’s lower limbs with Rett Syndrome and compare them with a normal girl’s moment. One subject(11yrs, 29.7 ㎏, 128.0 ㎝) was a girl with RS and the other subject (10yrs, 31.3 ㎏, 138.1 ㎝) was a normal girl. Their gaits were captured with seven infrared cameras(MCU-240, Qualisys Inc., Sweden) and recorded with two force plate(type9286A, Kisler Com., Swizerland) at the same time. Data were analyzed with a visual 3D-software(C-motion Inc., USA)