The implementation of a strategy to control the hip angle during gait is important to avoid disease progression in patients with hip osteoarthritis (OA).
Do patients with hip OA tend to stabilize ...their hip angles by a combination of whole-body movements during gait in terms of variability?
A public gait dataset comprising 80 asymptomatic participants and 106 patients with hip OA was used. Uncontrolled manifold analysis was performed using the joint angles as elemental variables and the hip joint angles as performance variables. The synergy index ΔV, variances of elemental variables that did not affect the performance variable (VUCM) and of those that affected the performance variable (VORT), and index of covariation strategy (COV) were calculated in sagittal and frontal plane. A one-sample t-test for statistical parametric mapping (SPM) analysis was used for ΔV and COV. Two-sample t-tests of SPM analyses were used for ΔV, VUCM, and VORT to compare the two groups.
In both planes, the ΔV and COV were significantly larger than zero in both groups (p < 0.001). In the sagittal plane, the VORT was higher in the hip OA group than in the control group after 77 % of stance phase. In the frontal plane, the hip OA group had larger ΔV and VUCM after last half and last quartile of stance phase compared to the control group, respectively. The VORT was smaller in the hip OA group than in the control group.
The hip angle was stabilized in the hip OA group in the frontal plane but insufficiently stabilized in the sagittal plane; however, the patients changed their hip angle during the early phase of stance. The combination of whole-body movements contributed to the stabilization of hip angle.
•The dynamic range of hip during gait is limited in patients with hip osteoarthritis.•Control strategy for the hip was investigated for inter-trial variance.•Hip angle variance was well controlled in the frontal plane.•The hip-angle variance in the sagittal plane was insufficiently controlled.•Angular changes occurred prior to changes in the variance in each plane.
To detect the effects of hip joint position on the quadriceps recruitment pattern of different resistance levels of rectus femoris (RF), vastus intermedius (VI), vastus lateralis (VL), and vastus ...medialis obliquus (VMO) in healthy people during knee extension.
Twenty healthy females performed isometric knee extension contractions at 0, 10, 20, and 30% of maximal voluntary isometric contraction (MVIC) with a 90° and 0° hip angle. Ultrasound shear-wave elastography was used to evaluate the shear elastic modulus of RF, VI, VL, and VMO during resting and contraction states.
At resting state, stiffness of RF was about 50% higher at 0° compared with at 90° of the hip (
< 0.01). There were significant differences in comparisons between 0 and 10% MVIC, 10 and 20% MVIC, and 20 and 30% MVIC in the four muscles, except that there was no significant difference between 20 and 30% MVIC for RF. There was a significant positive correlation between muscle stiffness and resistance level (r = 0.78-0.94,
< 0.001).
Hip joint position had effects on the quadriceps recruitment pattern of different resistance levels in healthy people during knee extension.
The importance of aerobic fitness in rowing has been widely studied, and it is accepted that aerobic fitness is a key factor in rowing performance. In contrast, the impact of rowing efficacy, ...especially rowing form, on rowing performance has not yet been fully elucidated. The present study aimed to investigate this subject via the analysis of hip kinematics and the association of this variable with 2000 m ergometer rowing test performance. Eleven adult male rowers underwent a 2000 m rowing test on an ergometer and the exhaled gas was analyzed. The hip joint angle, the pelvic rotation, and the knee joint angle were measured at the catch position throughout the test. Peak VO2 was strongly associated with the time taken to complete the test (ρ=–0.96, P<0.01), thereby confirming the importance of aerobic capacity in rowing performance. The variance of the hip joint angle of each rower was associated with peak VO2, lean mass, and test time (ρ=–0.72, –0.84, and 0.66, respectively, all P<0.05). Greater knee flexion was accompanied by larger posterior rotation of the pelvis (ρ=0.74, P<0.05), and was negatively associated with hip flexion (ρ=–0.76, P<0.05). Although we cannot confirm whether the consistency of the hip joint angle actually leads to better rowing performance, our results suggest that there are associations between the consistency of the hip joint angle, aerobic capacity, lean mass, and the time taken to complete the 2000 m ergometer rowing test.
Quadratus lumborum muscle (QL) is one of several muscles subject to tightness and relevant to symptoms in the back and hip. Although releasing the tight QL seems to resolve these symptoms in clinic, ...no study has investigated the effects of such releasing on the length of the hip and knee muscles.
To compare muscle length of the hip and knee joints between pre- and post-releasing the QL.
A quasi-experimental design (one-group pretest-posttest design) was conducted. Thirty asymptomatic participants with mean age of 20.40 years took part in the study. An examiner assessed the participants’ pelvic transverse gliding movement in standing and rotation of the upper trunk in supine to perceive the end feel of tissue resistance. The side with perceived more muscle tension was selected for receiving muscle release. Before manually releasing the QL, the participant was in the modified Thomas test position and pre-test range of motion (ROM) of hip flexion, hip abduction, and knee flexion angles was measured using a standard goniometer. After releasing the QL, the aforementioned angles were measured for post-test ROM.
The hip flexion angle was significantly reduced after releasing the QL (p < 0.05), whereas no statistically significant differences were found for the other 2 angles (p > 0.05).
The length of iliopsoas muscle was increased after releasing the QL. The findings may be due to continuous fascial connection and similar attachment of the origins of these 2 muscles.
NCT03016559.
Abstract
Background
Control system design for a microprocessor-controlled hip–knee–ankle–foot (HKAF) prosthesis is a challenge since hip disarticulation amputees lack the entire leg and, therefore, ...only have pelvis movement as user-guided input. This research proposes a method for determining hip joint angles from pelvis movement in a control system for the next generation of powered prostheses.
Method
Three-dimensional pelvic motion and stance time of 10 transfemoral (TF) prosthetic users were used to identify important features and to develop an algorithm to calculate hip angles from pelvis movement based on correlation and linear regression results. The algorithm was then applied to a separate (independent) TF group to validate algorithm performance.
Results
The proposed algorithm calculated viable hip angles during walking by utilizing pelvic rotation, pelvic tilt, and stance time. Small angular differences were found between the algorithm results and motion capture data. The greatest difference was for hip maximum extension angle (2.5 ± 2.0°).
Conclusions
Since differences between algorithm output and motion data were within participant standard deviations, the developed algorithm could be used to determine the desired hip angle from pelvis movements. This study will aid the future development of gait control systems for new active HKAF prostheses.
This study examined the effect of hip flexion angle on the stiffness of the adductor longus (AL) muscle during isometric hip flexion. Seventeen men were recruited. Ten participants performed ...submaximal voluntary contraction at 0%, 25%, 50%, and 75% of maximal voluntary contraction (MVC) during isometric hip flexion after performing MVC at 0°, 40°, and 80° of hip flexion. Seven participants performed submaximal voluntary tasks during isometric hip extension in addition to hip flexion task. The shear modulus of the AL muscle was used as the index of muscle stiffness, and was measured using ultrasound shear-wave elastography during the tasks at each contraction intensity for each hip flexion angle. During hip flexion, the shear modulus of the AL muscle was higher at 0° than at 40° and 80° of hip flexion at each contraction intensity (p < 0.016). Conversely, a significant effect was not found among hip flexion angle during hip extension at 75% of MVC (p = 0.867). These results suggest that mechanical stress of the AL muscle may be higher at 0° of hip flexion during isometric hip flexion.
Purpose
Neuromuscular activation of the adductor longus (AL) and adductor magnus (AM) muscles at different hip flexion angles during hip flexion and extension has not been clarified. This study aimed ...to compare the relationship between hip flexion angle and the electromyogram of the AL muscle with that of the AM muscle during isometric hip flexion and extension.
Methods
Fifteen healthy young men were included in this study. Participants performed maximal voluntary contractions during hip flexion and extension at six different hip flexion angles: − 20°, 0°, 20°, 40°, 60°, and 80°. The surface electromyograms of the AL and AM muscles were recorded. The root mean square (RMS) was calculated and normalized by the RMS during hip adduction for each individual muscle.
Results
The normalized RMS of the AL muscle was significantly higher than that of the AM muscle at a hip flexion angle of − 20° during hip flexion (
P
< 0.05). The mean normalized RMS of the AM muscle was significantly higher than that of the AL muscle during hip extension (
P
< 0.01).
Conclusion
These results suggest that the AL muscle is recruited specifically at the hip-extended position during hip flexion, and that the AM muscle is recruited regardless of the hip position during hip extension. Thus, the AL and AM muscles may have different functional roles in different hip flexion angles.
The importance of aerobic fitness in rowing has been widely studied, and it is accepted that aerobic fitness is a key factor in rowing performance. In contrast, the impact of rowing efficacy, ...especially rowing form, on rowing performance has not yet been fully elucidated. The present study aimed to investigate this subject via the analysis of hip kinematics and the association of this variable with 2000 m ergometer rowing test performance. Eleven adult male rowers underwent a 2000 m rowing test on an ergometer and the exhaled gas was analyzed. The hip joint angle, the pelvic rotation, and the knee joint angle were measured at the catch position throughout the test. Peak VO2 was strongly associated with the time taken to complete the test (ρ=–0.96, P<0.01), thereby confirming the importance of aerobic capacity in rowing performance. The variance of the hip joint angle of each rower was associated with peak VO2, lean mass, and test time (ρ=–0.72, –0.84, and 0.66, respectively, all P<0.05). Greater knee flexion was accompanied by larger posterior rotation of the pelvis (ρ=0.74, P<0.05), and was negatively associated with hip flexion (ρ=–0.76, P<0.05). Although we cannot confirm whether the consistency of the hip joint angle actually leads to better rowing performance, our results suggest that there are associations between the consistency of the hip joint angle, aerobic capacity, lean mass, and the time taken to complete the 2000 m ergometer rowing test.
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