견관절 외전 각도와 회전 자세에 따른 대흉근 활성도 비교

정도헌(Doh Heon Jung),이원휘(Won Hwee Lee),오재섭(Jae Seop Oh) 한국전문물리치료학회 2010 한국전문물리치료학회지 Vol.17 No.1

The purpose of this study was to compare EMG activity for pectoralis major myscle during shoulder movement with various abduction angle and rotation position in supine position. Fifteen healthy subjects were recruited for this study. All subjects performed shoulder horizontal adduction holding a 2kg dumbbell in shoulder abduction 40°, 70°, 90°, 130°, 160° with shoulder neutral, internal rotation(IR), and external rotation(ER). Surface EMC activity was recorded from pectoralis major clavicle part and pectoralis major sternum part for 5 seconds and EMG activity was normalized to the value of maximal voluntary isometric contraction (%MVIC). Dependent variable were examined with 3 (Neutral, IR, ER) x 5(40°, 70°, 90°, 130°, 160°) analysis of variance with repeated measures. THe EMG activity of pectoralis major muscle was significantly different between shoulder abduction angles and between shoulder rotation positions(p<.05). The highest value of EMG activity of pectoralis major sternum pars among shoulder abduction angles was in 130° and 90° in that order. According to the rotation degree, shoulder ER showed the highest value and IR showed the lowest value in both muscle parts. these results suggest that shoulder abduction 70°, 90°, 130° will be effective during manual muscle testing(MMT) and strengthening exercise for pectoralis major muscle. It is also supposed that shoulder ER is the efficient posture for strengthening of pectoralis major muscle.

다열근 심부 및 표면 근섬유 두께에 대한 세 가지 요추안정화 운동의 효과

김수정 ( Su Jung Kim ),하성민 ( Sung Min Ha ),박규남 ( Kyu Nam Park ),정도헌 ( Doh Heom Jung ),김태진 ( Tae Jin Kim ),신헌석 ( Heon Seock Cynn ),권오윤 ( Oh Yun Kwon ) 한국전문물리치료학회 2012 한국전문물리치료학회지 Vol.19 No.2

The lumbar multifidus muscle, which can be separated into deep fascicles (DM) and superlicial fascicles (SM), is important for lumbar segmental stability. However, no previous studies have investigated the effect of lumbar stabilization exercises on the thickness of DM and SM. Thus, the purpose of this study was to assess DM thickness after three different lumbar segmental stabilization exercises. In total, 30 healthy male participants were recruited and randomly assigned to one of three exercise groups: hollowing in the quadruped position (H-Quad), contralateral arm and leg lift (CALL), and bilateral arm and leg lift (BALL). Each lumbar segmental stabilization exercise was conducted over 4 weeks. Ultrasonography was used to compare the DM and SM thickness before and after the 4 weeks of exercise. A mixed-model analysis of variance using Scheffe`s post-hoc test was used for statistical analysis. The results showed a significant effect for the measurement time (before vs. after 4 weeks of exercise) in the DM (F=31.26, p<.05) and SM (F=4.56, p<.05). At the end of the 4 weeks, the DM thickness had increased significantly in the H-Quad exercise group, and the SM thickness had increased significantly in the CALL and BALL exercise groups. Also in the BALL exercise group, the SM thickness was greater compared with that in the H-Quad exercise group. These findings suggest that the thickness of the DM and SM were increased by different types of lumbar segmental stability exercise after 4 weeks.

편마비 환자의 팔 뻗기 과제 수행 시 목표거리와 건·환측 사용에 따른 운동시간과 체간의 움직임 분석

김기송(Ki Song Kim),유환석(Hwan Suk Yoo),정도헌(Doh Heon Jung),전혜선(Hye Seon Jeon) 한국전문물리치료학회 2010 한국전문물리치료학회지 Vol.17 No.1

The aim of this study was to investigate effects of reaching distance on movement time and trunk kinematics in hemiplegic patients. Eight hemiplegic patients participated in this study. The independent variables were side (sound side vs. affected side) and target distance (70%, 90%, 110%, and 130% of upper limb). The dependent variables were movement time measured by pressure switch and trunk kinematics measured by motion analysis device. Two-way analysis of variance with repeated measures was used with Bonferroni post-hoc test. (1) There were significant main effects in side and reaching distance for movement time (p=.01, p=.02). Post-hoc test revealed that there was a significant difference between 110% and 130% of reaching distance (p=.01). (2) there was a significant main effect in side and reaching distance for trunk flexion(p=.01, p=.00). Post-hoc test revealed that there were significant differences in all pair-wise reaching distance comparison. (3) There was a significant side by target distance interaction for trunk rotation (p=.04). There was a significant main effect in target distance (p=.00). Post-hoc test revealed that there were significant differences between 70% and 110%, 70% and 130%, 90% and 110%, 90% and 130% of target distance. It was known that trunk flexion is used more than trunk rotation during reaching task in hemiplegic patients from the findings of this study. It is also recommended that reaching training is performed with limiting trunk movement within 90% of target distance whereas reaching training is performed incorporating with trunk movement beyond 90% of target distance in patients with hemplegia.

한 다리 서기 시 내측 쐐기(wedge)의 적용이 하지 근활성도에 미치는 영향

홍지아(Ji-a Hong),김민희(Min-hee Kim),정도헌(Doh-heon Jung),임원빈(One-bin Lim),이충휘(Chung-hwi Yi) 한국전문물리치료학회 2011 한국전문물리치료학회지 Vol.18 No.2

Foot posture is important in the development of the musculoskeletal structure in the lower limbs because it can change the mechanical alignment. Although foot orthotics are widely used for the correction of malalignments in the lower extremities, the biomechanical effects of wedges have not yet been cleared. The aim of this study was to investigate whether medial wedges affect the electromyographic (EMG) activity of the knee and hip joints in healthy adults that are performing one leg standing. Seventeen healthy volunteers performed the one leg standing under two foot conditions: A level surface, and a 15° medial wedge. The subjects’ EMG data for the gluteus maximus (Gmax), gluteus medius (Gmed) , tensor fasciae latae (TFL), biceps femoris (BF), vastus lateralis (VL), and vastus medialis oblique (VMO) were recorded, along with the surface EMG, and all were analyzed. The EMG activity of the Gmed and TFL had significantly decreased under the medial wedge condition during one leg standing. Further study is needed in order to investigate whether medial wedges influence the EMG activity and kinematic data of the knee and hip joints as well as the ankle joints in adults with flexible flatfoot, while they are performing one leg standing.

심부경부굴곡 운동 시 복근 수축이 표면경부굴곡근의 근활성도, 흉곽 거상, 두개경부굴곡 각도에 미치는 영향

박규남(Kyue-nam Park),원종혁(Jong-hyuck Won),이원휘(Won-hwee Lee),정성대(Sung-dae Chung),정도헌(Doh-heon Jung),오재섭(Jae-seop Oh) 한국전문물리치료학회 2009 한국전문물리치료학회지 Vol.16 No.3

The purpose of this study was to examine contraction of abdominal muscles on surface electromyographic (EMG) activity of superficial cervical flexors, rib cage elevation and angle of craniocervical flexion during deep cervical flexion exercise in supine position. Fifteen healthy subjects were participated for this study. All subjects performed deep cervical flexion exercise with two methods. The positions of two methods were no volitional contraction of abdominal muscles in hook-lying position with 45 degrees hip flexion (method 1) and 90 degrees hip and knee flexion with feet off floor for inducing abdominal muscle contraction (method 2). Surface EMG activities were recorded from five muscles (sternocleidmastoid, anterior scaleneus, recuts abdominis, external oblique, internal oblique). And distance of rib cage elevation and angle of craniocervical flexion were measured using a three dimensional motion analysis system. The EMG activitiy of each muscle was normalized to the value of reference voluntary contraction (%RVC). The EMG activities, distance of rib cage elevation, and angle of craniocervical were compared using a paired t-test between two methods. The results showed that the EMG activities of sternocleidmastoid and anterior scaleneus during deep cervical flexion exercise in method 2 were significantly decreased compared to method 1 (p<.05). Distance of rib cage elevation and angle of craniocervical flexion were significantly decreased in method 2 (p<.05). The findings of this study indicated that deep cervical flexion exercise with contraction of abdominal muscles could be an effective method to prevent substitute motion for rib cage elevation and contraction of superficial neck flexor muscles.

전신 기울기 운동 시 시각적 바이오피드백이 올바른 자세 유지 시간과 체간 근육의 근활성도에 미치는 영향

강민혁(Min-hyeok Kang),윤지연(Ji-yeon Yoon),양재락(Jae-lak Yang),장준혁(Jun-hyeok Jang),정도헌(Doh-heon Jung),오재섭(Jae-seop Oh) 한국전문물리치료학회 2011 한국전문물리치료학회지 Vol.18 No.1

The purpose of this study was to assess visual biofeedback's influence on trunk muscles' (EMG) activity and endurance holding time for correct position during whole-body tilt exercise. For the study, we recruited 14 volunteers who showed no symptom of lumbar disease during medical tests. We measured the EMG activity of their rectus abdominis, external abdominal oblique, internal abdominal oblique and erector spinae muscles, and their endurance holding time for correct position during 40˚ anterior and posterior whole-body tilt under two conditions: whole-body tilt with and without visual biofeedback. Resistance with gravitational force on the trunk during whole-body tilt was applied by using a device that had a monitor on which the subjects could check their alignment and that sounded an alarm if a subject's alignment collapsed. The study showed an increase in the EMG activity of external abdominal oblique, internal abdominal oblique/rectus abdominis ratio and endurance holding time for correct position during both 40˚ anterior and posterior whole-body tilt with visual biofeedback compared with without visual biofeedback (p<.05). We suggest that the whole-body tilt exercise with visual biofeedback could be a beneficial strategy for selectively strengthening the internal abdominal oblique muscle and minimizing the rectus abdominis muscle's activity while maintaining correct alignment during whole-body tilt exercise.