[Show abstract][Hide abstract] ABSTRACT: The aim of this research was to investigate which shoulder abduction angle (30°, 90°, 150°) during shrug exercise is superior for 1) activating the scapular upward rotators and 2) improving scapular and clavicular position in subjects with scapular downward rotation impairment. Twenty subjects performed shrug exercises at three different shoulder abduction angles (30°, 90°, 150°) which were obtained and maintained actively. Surface EMG data were collected from the levator scapulae (LS), upper trapezius (UT), lower trapezius (LT), and serratus anterior (SA) during shrug exercises. Scapular downward rotation index (SDRI) and clavicular tilt angle (CTA) were measured immediately after each shrug exercise. Oneway repeated-measures analysis of variance was used to determine the significance. UT muscle activity was greater at 90° and 150° than at 30° of shoulder abduction. UT/LS muscle activity ratio was greater at 90° than at 30°. LT and LT/LS increased as shoulder abduction angle increased. SA was greater at 150° than at 30° or 90°. SA/LS was greater at 150° than at 30°. SDRI was lower at 90° and 150° than at 30°. CTA was greater at 90° and 150° than at 30°. In conclusion, shrug exercises at 90° or 150° of shoulder abduction angle may be advocated to activate scapular upward rotators, decrease SDRI, and increase CTA in patients with scapular downward rotation impairment.
Journal of Electromyography and Kinesiology 01/2015; · 1.73 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The purpose of this case report is to investigate the long-term effect of Adeli suit treatment (AST) in a child with cerebral palsy (CP) on spatial-temporal gait parameters, 10-meter walking speed, gross motor functional measure (GMFM) and performance on the pediatric balance scale (PBS). An eight-year-old girl with spastic diplegia classified as level III on the Gross Motor Function Classification System participated in this single-subject A-B design study, with a baseline and an intervention phase. The baseline phase was collected at one-week intervals for six weeks and then the AST intervention phase was carried out with 18 AST sessions, 50 min per session, once a week for an 18-week period. Spatial-temporal gait parameters significantly improved after the completion of 18 sessions. Furthermore, 10-meter walking speed, GMFM and PBS changed significantly from the baseline measurement (p < 0.05). In conclusion, the AST was effective in improving gait, gross motor function and balance in a child with diplegic CP. Clinically, neuro-rehabilitation with AST provided a complementary and alternative treatment for lower extremity rehabilitation in this child with CP. These findings provide preliminary evidence supporting the effectiveness of AST in children with spastic CP, and thus underscore the need for additional research in this area.
[Show abstract][Hide abstract] ABSTRACT: The goal of the current study was to investigate potential differences in back and hip extensor muscle activity and hip extension force during prone hip extension (PHE) in individuals with lumbar segmental instability (LSI) and asymptomatic subjects. Thirty-six subjects with LSI and 26 asymptomatic volunteers participated in this study. Muscle activity of the erector spinae, gluteus maximus, and biceps femoris was recorded using electromyography (EMG), and hip extension force was measured by a digital force gauge. Muscle activity was significantly greater in subjects with LSI than in asymptomatic subjects during PHE (p < 0.05). Hip extension force was significantly lower in the subjects with LSI than in asymptomatic subjects during PHE (p < 0.05). These findings suggest that during PHE, subjects with LSI have differences in back and hip extensor muscle activity and hip extension force compared to asymptomatic individuals.
[Show abstract][Hide abstract] ABSTRACT: Tightness of the iliotibial band (ITB) has been documented as a major factor in lateral patellar translation because the ITB inserts into the lateral border of the patella through the iliopatellar band. The aim of this study was to compare the patella-condyle distance (PCD) between subjects with and without ITB tightness. We also investigated the relationship between ITB length and lateral patellar translation in hip adduction.
[Show abstract][Hide abstract] ABSTRACT: Objective
to compare the effects of pulsed electromagnetic field (PEMF) therapy and sham treatment on DOMS-related variables in elbow flexors at 24, 48 and 72 hours after delayed onset muscle soreness (DOMS) induction exercise.
randomized, double-blind, placebo-controlled study.
Yonsei University laboratory.
In total, 30 healthy male college students Main outcome measures: Muscle soreness, peak torque, median frequency (MDF) and electromechanical delay (EMD) during isometric contraction at 24, 48 and 72 hours after DOMS induction exercise.
Overall, the application of the PEMF was found to be effective in reducing the physiological deficits associated with DOMS, including improved recovery of perceived muscle soreness, MDF, and EMD during isometric contraction. Our results did not show that PEMF treatment was mechanically more effective in isometric peak torque generation compared to the sham group.
this study indicates that PEMF may be useful as a modality to reduce DOMS symptoms. However, further well-designed experiments are required to determine optimal treatment dosage and duration, and to investigate the physiological and clinical mechanisms of PEMF on DOMS.
Physical Therapy in Sport 03/2014; · 1.37 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The smart-phone has become a necessity for most people. In this study, we determined that using a smart-phone for 20 minutes can cause increased neck and shoulder muscle activities and fatigue. Seventeen healthy male smart-phone users who attended Yonsei University played a smart-phone game for 20 minutes and changes in their bilateral cervical erector spinae and upper trapezius muscle activities and fatigue were measured. To assess muscle activities and fatigue, we used the following variables: the median frequency, the 50th percentile Amplitude probability distribution function (APDF) value (median load), and the discrepancy in the 90th percentile APDF value and the 10th percentile APDF value (APDF range). A paired t-test was used to compare pre-smart-phone-use status with post-smart-phone-use-status. The median frequency of the bilateral cervical erector spinae and the upper trapezius decreased significantly after 20 minutes of smart-phone use (p
[Show abstract][Hide abstract] ABSTRACT: Delayed onset muscle soreness (DOMS) is a painful condition that arises from exercise-induced muscle damage after unaccustomed physical activities. Various therapeutic interventions have been applied to reduce the intensity and duration of DOMS-related symptoms. Recently, pulsed electromagnetic field (PEMF) intervention has been introduced as an alternative noninvasive treatment for DOMS. This randomized, double-blind, placebo-controlled experiment was conducted to examine the effects of PEMF therapy on DOMS in elbow flexors at 24, 48, and 72 hours after the experimental DOMS induction. Thirty healthy volunteers ( yrs, cm, and kg) participated in this study. Each was randomly assigned to a PEMF or placebo group. On the first day, DOMS was induced in the elbow flexors by repeated isokinetic motions at low () and fast () speeds in all subjects. Thereafter, the PEMF group received 15-min daily treatment with a PEMF device. The placebo group received sham treatment of the same duration. Overall, PEMF application was more effective than the sham treatment in reducing the physiological symptoms associated with the DOMS including perceived soreness, median frequency, and electromechanical delay of the surface electromyography. In addition, median frequency and isokinetic peak torque of the PEMF group recovered to the pre-DOMS induction level earlier than the placebo group. In conclusion, this study suggests that PEMF can be applied as a new recovery strategy in reducing DOMS symptoms. Further experiments are required to examine the effect of the PEMF treatment on different types of exercise conditions and to determine the optimal treatment dosage and duration in a real clinical setting.
[Show abstract][Hide abstract] ABSTRACT: We evaluated whether group locomotor imagery training-combined knowledge of performance (KP) lead to improvements in gait function in community dwelling individuals with chronic stroke. Ten adults who had suffered a hemiparetic stroke at least 6 months earlier participated in group locomotor imagery training-combined KP for 5 weeks, twice per week, with 2 h intensive training. Dynamic gait index scores increased significantly after the group locomotor imagery training-combined KP. However, times for the timed up-and-go test did not improve significantly after the training. Group locomotor imagery training-combined KP may be a useful option for the relearning of gait performance for community dwelling individuals with chronic hemiparetic stroke.
[Show abstract][Hide abstract] ABSTRACT: The direction of fiber alignment within a muscle is known to influence the effectiveness of muscle contraction. However, most of the commonly used clinical gluteus maximus (GM) exercises do not consider the direction of fiber alignment within the muscle. Therefore, the purpose of this study was to investigate the influence of hip abduction position on the EMG (electromyography) amplitude and onset time of the GM and hamstrings (HAM) during prone hip extension with knee flexion (PHEKF) exercise. Surface EMG signals were recorded from the GM and HAM during PHEKF exercise in three hip abduction positions: 0°, 15°, and 30°. Thirty healthy subjects voluntarily participated in this study. The results show that GM EMG amplitude was greatest in the 30° hip abduction position, followed by 15° and then 0° hip abduction during PHEKF exercise. On the other hand, the HAM EMG amplitude at 0° hip abduction was significantly greater than at 15° and 30° hip abduction. Additionally, GM EMG onset firing was delayed relative to that of the HAM at 0° hip abduction. On the contrary, the GM EMG onset occurred earlier than the HAM in the 15° and 30° hip abduction positions. These findings indicate that performing PHEKF exercise in the 30° hip abduction position may be recommended as an effective way to facilitate the GM muscle activity and advance the firing time of the GM muscle in asymptomatic individuals. This finding provides preliminary evidence that GM EMG amplitude and onset time can be modified by the degree of hip abduction.
[Show abstract][Hide abstract] ABSTRACT: BACKGROUND: This study examined the effects of ankle and knee joint immobilization on postural control in healthy young adults while standing. METHODS: The 24 participants included in this study participated in postural standing tests under four different constraint conditions: free joints, ankle immobilization only, knee immobilization only, and ankle-knee immobilization. Tests were performed using a commercial balancing equipment (Biodex(TM), Inc., NY, USA) and software. RESULTS: The overall limit-of-stability score and duration to completion of task were obtained at 75% limit-of-stability (moderate level of difficulty). The overall limit-of-stability score of free joints (34.5±9.1) were significantly different with the ankle immobilization only (26.0±11.6), and ankle-knee immobilization (26.4±7.4) conditions. The test duration increased in the following order: free joints (57.8±10.9), knee immobilization only (62.5±14.0), ankle immobilization only (68.0±14.9), and ankle-knee immobilization (69.4±17.7). The duration of the free joint condition greatly decreased than ankle immobilization only and ankle-knee immobilization conditions. CONCLUSIONS: The ankle and knee joints have sufficient range of motion to prevent falls related to decrease postural stability due to insufficient range of motion or to improve postural stability.
[Show abstract][Hide abstract] ABSTRACT: As a means of external stabilization of the sacroiliac joint (SIJ), many clinicians have often advocated the use of the pelvic compression belt (PCB). The objective of this pilot study was to compare the effects of the PCB on hip extensor muscle activation patterns during one-leg standing in subjects with and without sacroiliac joint pain (SIJP). Sixteen subjects with SIJP and fifteen asymptomatic volunteers participated in this study. Surface electromyography (EMG) data [signal amplitude and premotor reaction time (RT)] were collected from the gluteus maximus and biceps femoris muscles of the supporting leg during one-leg standing with and without the PCB. Compared to that of the asymptomatic individuals, the EMG amplitude of the biceps femoris was significantly decreased in individuals with SIJP upon the application of the PCB (p < 0.05). Furthermore, on using the PCB, in individuals with SIJP, the RT of the gluteus maximus was significantly decreased; however, the RT of the biceps femoris was increased (p < 0.05). Thus, our data support the use of the PCB to modify the activation patterns of the hip extensors among patients with SIJP.
[Show abstract][Hide abstract] ABSTRACT: The purpose of this study was to investigate the kinematic and kinetic changes that may occur in the pelvic and spine regions during cross-legged sitting postures. Experiments were performed on sixteen healthy subjects. Data were collected while the subject sat in 4 different sitting postures for 5 seconds: uncrossed sitting with both feet on the floor (Posture A), sitting while placing his right knee on the left knee (Posture B), sitting by placing right ankle on left knee (Posture C), and sitting by placing right ankle over the left ankle (Posture D). The order of the sitting posture was random. The sagittal plane angles (pelvic tilt, lumbar A-P curve, thoracic A-P curve) and the frontal plane angles (pelvic obliquity, lumber lateral curves, thoracic lateral curves) were obtained using VICON system with 6 cameras and analyzed with Nexus software. The pressure on each buttock was measured using Tekscan. Repeated one-way analysis of variance (ANOVA) was used to compare the angle and pressure across the four postures. The Bonferroni's post hoc test was used to determine the differences between upright trunk sitting and cross-legged postures. In sagittal plane, cross-legged sitting postures showed significantly greater kyphotic curves in lumbar and thoracic spine when compared uncrossed sitting posture. Also, pelvic posterior tilting was greater in cross-legged postures. In frontal plane, only height of the right pelvic was significantly higher in Posture B than in Posture A. Finally, in Posture B, the pressure on the right buttock area was greater than Posture A and, in Posture C, the pressure on the left buttock area was greater than Posture A. However, all dependent variables in both planes did not demonstrate any significant difference among the three cross-legged postures (p>.05). The findings suggest that asymmetric changes in the pelvic and spine region secondary to the prolonged cross-legged sitting postures may cause lower back pain and deformities in the spine structures.
[Show abstract][Hide abstract] ABSTRACT: The present study highlighted a novel motor point location index (MPLI) for the precise localization of the motor point (MP) of the tibialis anterior (TA) using a regression equation.
Twenty healthy young adults (female=8; mean age ± SD=18.50 ± 0.32) were volunteered for this study. The regression analysis was performed by correlating the MP locations with anatomical landmarks. The TA muscle's MP location was bilaterally determined by needle electromyography (EMG) measurement. The anatomical landmarks included lower leg length (LLL), tibial tuberosity-intermalleolar line length (TT-ILL), the knee width (KW) and the leg width (LW).
The excellent correlation between the TT-ILL and the vertical MP location was obtained, R(2) 0.815. Approximately 82% of the variance of the vertical MP location was accounted for by its linear relationship with the TT-ILL. The high correlation between the LW and the horizontal MP location was observed, R(2)=0.764. Approximately 77% of the variance of the horizontal MP location index was accounted for by its linear relationship with the LW.
These findings indicate that the anatomical landmarks were useful to accurately predict MP locations for the TA muscle. Clinically, this MP location index using regression equations may be alternative for the current method that was not previously affordable.
[Show abstract][Hide abstract] ABSTRACT: A commercial splinting system is designed to permit quick training in opening and closing the affected hand in order to overcome the disadvantages of previous approaches.
The purpose of this study was to assess the feasibility of intensive training using a spring-assisted hand orthosis on upper extremity in individuals with chronic hemiparetic stroke.
Five participants for the experimental group and 5 for the control group were recruited from a local rehabilitation hospital. Subjects in the experimental group participated in 4 weeks of training using a SaeboFlex orthosis for 1 hour per day, 5 times per week. Each subject in the control group wore the same orthosis for 1 hour per day without participating in upper extremity training. Outcome measures included the Fugl-Meyer Assessment, Box and Block Test, and Action Research Arm Test; kinematic parameters were collected using a 3-D motion analysis system.
The Fugl-Meyer assessment and the Box and Block Test score were increased significantly in the experimental group after the intervention. The resultant velocity of the wrist joint for the reach-to-grasp task decreased significantly, and the resultant velocity of the shoulder joint while performing a reach-to-grasp task at acromion height decreased significantly in the experimental group.
A pilot clinical study of spring-assisted dynamic hand orthosis training is feasible in recovering the movement of the hemiparetic upper extremity.
Topics in Stroke Rehabilitation 01/2012; 19(4):320-8. · 1.22 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: We investigated the effects of four weeks of training using a knee extension with hip adduction (KEWHA) exercise in asymptomatic participants. In addition, we compared different methods of electromyographic (EMG) onset-time detection. Eighteen participants who achieved earlier activation of the vastus lateralis (VL) muscle compared to that of the vastus medialis obliquus (VMO) muscle performed the isometric KEWHA exercise in the sitting position for four weeks. A 15° hip adduction was added to the existing knee extension in the KEWHA exercise. EMG onset times were detected using a computer-analyzed system and evaluated using two methods in which the thresholds for activity onset were set at two and three standard deviations (SDs) of the mean baseline activity. No significant difference in the EMG onset-time for the VMO muscle was observed compared to that of the VL muscle between the pre- and post-tests (p>0.05) when data at 2SDs of the mean baseline activity were analyzed. However, a significant difference in the onset times for the VMO muscle and VL muscle was found between the pre- and post-tests (p<0.05) when data at 3SDs of the mean baseline activity were analyzed. In addition, less variation was observed in data analyzed at 3SDs compared to that of the data at 2SDs. The normalized VMO:VL muscle ratio was not significantly different between the pre- and post-tests. These findings show that the KEWHA exercise may decrease the difference between the onset times of VMO and VL muscles. In addition, we suggest that task-specific EMG onset-time detection methods are required to minimize variations in the data obtained during the recording of muscle activation.
Journal of electromyography and kinesiology: official journal of the International Society of Electrophysiological Kinesiology 09/2011; 21(6):1011-6. · 2.00 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The effects of passive correction of scapular position (PCSPT) on pain, proprioception, and range of motion (ROM) were investigated in neck-pain patients with bilateral scapular downward-rotation (SDR). Fifteen neck-pain patients with bilateral SDR were recruited from a workplace based work-conditioning center. The intensity of pain felt was quantified using a visual analogue scale. Kinematic data for ROM and joint-position error (JPE) were analyzed using a 3-dimensional motion-analysis system. Differences in pain, JPE, and ROM with and without PCSPT were assessed using a paired t-test. PCSPT significantly decreased JPE and neck pain during active neck rotation and significantly increased neck-rotation ROM (p < 0.05). These findings suggest that PCSPT results in decreased neck pain and improved neck-rotation ROM and proprioception during active neck rotation in neck-pain patients with bilateral SDR.
[Show abstract][Hide abstract] ABSTRACT: To determine the effect of novel augmented abdominal drawing-in maneuver (ADIM) training using rehabilitative ultrasound imaging (RUSI) and electromyography (EMG) in adults with core instability.
A convenience sample of 20 young adults with core instability (female =4; mean age ± standard deviation=24.4 ± 2.9 years) was recruited. Core instability was determined by the formal test. All subjects underwent an intensive ADIM that was augmented by comprehensive visual feedback via a pressure biofeedback unit, RUSI, and EMG. The intervention was provided for 20 minutes a day, 7 days a week, over a two-week period.
The paired t-test showed that both transverse abdominal (TrA) and internal oblique (IO) muscle thickness during ADIM were significantly greater than at rest (p= 0.000). However, external oblique (EO) muscle thickness remained relatively unchanged. The mean EMG amplitudes of the EO and erector spinae (ES) muscles were significantly decreased after the intervention (p=0.001, p=0.008). The intra-class correlation coefficient (ICC(1,2)) showed the excellent test-retest reliability for muscle thickness (ranging from 0.90 to 0.98 in the prone position).
This is the first evidence to demonstrate that the novel augmented ADIM training can effectively improve the lumbo-pelvic stabilization in adults with core instability.
Journal of Back and Musculoskeletal Rehabilitation 01/2011; 24(4):233-40. · 1.04 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: To improve trunk stability or trunk muscle strength, many athletic trainers and physiotherapists use various types of unstable equipment for training. The round foam roll is one of those unstable pieces of equipment and may be useful for improving trunk stability.
To assess the effect of the supporting surface (floor versus round foam roll) on the activity of abdominal muscles during a single-legged hold exercise performed in the hook-lying position on the floor and on a round foam roll.
University research laboratory.
Nineteen healthy volunteers (11 men, 8 women) from a university population.
The participants were instructed to perform a single-legged hold exercise while in the hook-lying position on the floor (stable surface) and on a round foam roll (unstable surface).
Surface electromyography (EMG) signals were recorded from the bilateral rectus abdominis, internal oblique, and external oblique muscles. Dependent variables were examined with a paired t test.
The EMG activities in all abdominal muscles were greater during the single-legged hold exercise performed on the round foam roll than on the stable surface.
The single-legged hold exercise in the hooklying position on an unstable supporting surface induced greater abdominal muscle EMG amplitude than the same exercise performed on a stable supporting surface. These results suggest that performing the single-legged hold exercise while in the hook-lying position on a round foam roll is useful for activating the abdominal muscles.
Journal of athletic training 01/2011; 46(4):403-8. · 1.51 Impact Factor