Balance of the Human Body in Hybrid Poses between Standing and Sitting in a Passive Exoskeleton of the Lower Limbs

2021 ◽  
Vol 47 (4) ◽  
pp. 410-418
Author(s):  
N. D. Babanov ◽  
I. V. Merkuryev ◽  
O. V. Kubryak
Keyword(s):  
Human Body ◽  
Lower Limbs ◽  
Passive Exoskeleton

Correction of Posture Deviations in the Sagittal Plane Using the Pilates Method

2019 ◽  
pp. 3-13
Author(s):  
Alexandru Cîtea ◽  
George-Sebastian Iacob
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Postural Control ◽  
Human Body ◽  
Sagittal Plane ◽  
The Body ◽  
Lower Limbs ◽  
Low Back ◽  
Pilates Method ◽  
The Relationship

Posture is commonly perceived as the relationship between the segments of the human body upright. Certain parts of the body such as the cephalic extremity, neck, torso, upper and lower limbs are involved in the final posture of the body. Musculoskeletal instabilities and reduced postural control lead to the installation of nonstructural posture deviations in all 3 anatomical planes. When we talk about the sagittal plane, it was concluded that there are 4 main types of posture deviation: hyperlordotic posture, kyphotic posture, rectitude and "sway-back" posture.Pilates method has become in the last decade a much more popular formof exercise used in rehabilitation. The Pilates method is frequently prescribed to people with low back pain due to their orientation on the stabilizing muscles of the pelvis. Pilates exercise is thus theorized to help reactivate the muscles and, by doingso, increases lumbar support, reduces pain, and improves body alignment.

Morphological Evolution of French Military Personnels

2000 ◽  
Vol 44 (38) ◽  
pp. 744-747
Author(s):  
Régis Mollard ◽  
Pierre Yves Hennion ◽  
Alex Coblentz
Keyword(s):  
Human Body ◽  
Morphological Evolution ◽  
The Body ◽  
Lower Limbs ◽  
Morphological Transformation ◽  
Military Population ◽  
Morphological Modification ◽  
Human Body Models ◽  
The Individual ◽  
The Military

The survey realized in 1992 on a military population allowed to collect anthropometric data on 688 males and 328 females. Among 73 measurements and 3 index, 26 of them have been retained for the comparison with previous surveys. Generally used for dimensioning human body models these data represent somatic measurements of reference, as weight and stature and segmentary measurements of trunk and limbs. A comparison with previous data, collected on a equivalent military population in 1973, confirms the modifications along the time are so significant that they can be considered as a phenomenon of morphological evolution. Likewise, the modification of the academic levels, average age and socio-cultural structures in the populations are combined to increase the anthropometric variability. It appears the military population presents a morphological modification with an overall increase in weight, stature and correlated dimensions. Otherwise, a light decrease of the cormic index indicates that the morphological transformation influences on the body proportions, with an increase more notable for the lower limbs compared to the trunk. The collected anthropometric information allow to update the Individual Database of ERGODATA from which ergonomie recommendations and statistical and morphological models of the human body can be proposed.

Working a half-stone of an old man

2021 ◽  
Vol 2 (3/S) ◽  
pp. 356-360
Author(s):  
Javli Kudratov
Keyword(s):  
Human Body ◽  
The Body ◽  
Lower Limbs ◽  
Characteristic Points ◽  
Human Figure ◽  
Head Neck

The most important parts of the human body are divided into the head, neck, shoulders, chest area of   the body, waist and upper and lower limbs.  The structure of the human body is manifested in many different personalities, in many complex and unusual combinations. Drawing a human figure is the student's perspective, proportion, plastic anatomy, to have a deeper knowledge of the forms of movement and the principle of the main characteristic points and reference lines  the pin requires more reliable, more accurate application.

Develop a Flexible Regenerative Exoskeleton to Assist Walking

2018 ◽  
Author(s):  
Longhan Xie ◽  
Xiaodong Li
Keyword(s):  
Kinetic Energy ◽  
Human Body ◽  
Lower Limb ◽  
Metabolic Cost ◽  
Lower Limbs ◽  
Metabolic Energy ◽  
Lower Limb Exoskeleton ◽  
Negative Work ◽  
Lower Limb Muscles ◽  
Assisting Device

During walking, human lower limbs accelerate and decelerate alternately, during which period the human body does positive and negative work, respectively. Muscles provide power to all motions and cost metabolic energy both in accelerating and decelerating the lower limbs. In this work, the lower-limb biomechanics of walking was analyzed and it revealed that if the negative work performed during deceleration can be harnessed using some assisting device to then assist the acceleration movement of the lower limb, the total metabolic cost of the human body during walking can be reduced. A flexible lower-limb exoskeleton was then proposed; it is worn in parallel to the lower limbs to assist human walking without consuming external power. The flexible exoskeleton consists of elastic and damping components that are similar to physiological structure of a human lower limb. When worn on the lower limb, the exoskeleton can partly replace the function of the lower limb muscles and scavenge kinetic energy during lower limb deceleration to assist the acceleration movement. Besides, the generator in the exoskeleton, serving as a damping component, can harvest kinetic energy to produce electricity. A prototype of the flexible exoskeleton was developed, and experiments were carried out to validate the analysis. The experiments showed that the exoskeleton could reduce the metabolic cost by 3.12% at the walking speed of 4.5 km/h.

scholarly journals A Novel Evaluation Method of Static Balance Ability Based on Human Pelvic Center Measurement

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Mingli Xia ◽  
Shuai Guo
Keyword(s):  
Human Body ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Principal Component ◽  
Lower Limbs ◽  
Control Group ◽  
Static Balance ◽  
Movement Trajectory ◽  
Significant Difference ◽  
Balance Ability

This study evaluates the static balance ability of human body based on a lower limb rehabilitation robot. According to the balance parameters obtained from the movement trajectory of the center of human pelvis, SPSS statistical software was used to verify that there was a significant difference between the two groups ( p < 0.01 ). Principal component analysis is used to allocate the weight of each parameter and establish the comprehensive evaluation value. The comprehensive evaluation value of the control group was 0.383 ± 0.038, and the experimental group was 0.875 ± 0.136. When the subject’s comprehensive evaluation value is between 0.739 and 1.011, it indicates the presence of balance dysfunction, and when it is between 0.345 and 0.421, it indicates that the balance of the lower limbs of the subject is normal. Experimental results show that this evaluation method can objectively and quantitatively reflect the static equilibrium state of human body.

scholarly journals Pressure Evaluation Of Seamless Yoga Leggings Designed With Partition Structure

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Weirong Wang ◽  
Xuliang Yu ◽  
Honglian Cong
Keyword(s):  
Human Body ◽  
Pressure Change ◽  
Structure Design ◽  
Lower Limbs ◽  
Functional Evaluation ◽  
Skin Deformation ◽  
Novel Approach ◽  
Skin Pressure ◽  
Partition Structure ◽  
Human Body Surface

Abstract It is a novel approach to design the partition structure of clothing according to the deformation of the human body surface skin during exercise. The functional evaluation of these products remains unknown, and there is limited knowledge about the effects of the partition structure design on the pressure comfort of clothing. This research carried out a partitioned structural design of the leggings based on the skin deformation of the lower limbs of the human body during yoga exercise and developed two styles of seamless yoga leggings. The skin pressure exerted by the new seamless yoga leggings was compared with two commercial yoga leggings. Eight female college students were invited to wear all the yoga leggings samples and perform yoga exercises. The skin pressure exerted by yoga leggings was measured by the German novel-Pliance multipurpose pressure distribution measurement system on 10 body positions. The results showed that yoga leggings designed with a partitioned structure exert a comfortable pressure on the skin during yoga exercise, and the pressure change was smaller under different yoga postures, which has better pressure stability. The partition structure design model of seamless yoga leggings was optimized, which provided a reference for the functional partition design and product development of seamless yoga leggings.

scholarly journals Health Index Monitoring of Sports Injury Rehabilitation Training Based on Wearable Sensors

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Jiang Yi ◽  
Yuepei Zou
Keyword(s):  
Human Body ◽  
Lower Limb ◽  
Wearable Sensors ◽  
Sports Injury ◽  
Human Motion ◽  
Lower Limbs ◽  
Angle Sensor ◽  
Perception System ◽  
Movement Mechanism ◽  
Analysis System

In order to design the perception system of the lower limb wearable rehabilitation robot, this study established the kinematics theoretical model of human lower limb and conducted the kinematics analysis of human body. By using the dynamic attitude analysis system, combined with the human body mark points, the position data of human body mark points in the process of standing up, sitting up, walking, stepping up, and squatting were collected. Combined with the movement mechanism of human lower limbs, the characteristics of human motion state transition are analyzed, and the perceptual algorithm for judging human motion intention is studied, so as to determine the wearer’s current posture, standing intention while sitting, walking intention while standing, moving intention, and stopping intention during walking. The results show that the angle of the hip joint changes regularly between 0° and 37° and the angle of the knee joint changes regularly between 0° and 70°during the standing process, which is consistent with the angle change trajectory collected by the dynamic attitude analysis system. The angle trajectories of the hip and knee joints measured by the absolute angle sensor are the same as those obtained by the dynamic attitude analysis system. 1.5 rad and 0.3 rad were selected as reasonable and effective thresholds for determining sitting and standing states.

scholarly journals The Analysis of Plantar Pressure Data Based on Multimodel Method in Patients with Anterior Cruciate Ligament Deficiency during Walking

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Xiaoli Li ◽  
Hongshi Huang ◽  
Jie Wang ◽  
Yuanyuan Yu ◽  
Yingfang Ao
Keyword(s):  
Anterior Cruciate Ligament ◽  
Human Body ◽  
Plantar Pressure ◽  
Cruciate Ligament ◽  
Lower Limbs ◽  
Pressure Data ◽  
Anterior Cruciate Ligament Deficiency ◽  
Gait Characteristics ◽  
Motion Function ◽  
Anterior Cruciate

The movement information of the human body can be recorded in the plantar pressure data, and the analysis of plantar pressure data can be used to judge whether the human body motion function is normal or not. A two-meter footscan® system was used to collect the plantar pressure data, and the kinetic and dynamic gait characteristics were extracted. According to the different description of gait characteristics, a set of models was established according to various people to present the movement of lower limbs. By the introduction of algorithm in machine learning, the FCM clustering algorithm is used to cluster the sample set and create a set of models, and then the SVM algorithm was used to identify the new samples, so as to complete the normal and abnormal motion function identification. The multimodel presented in this paper was carried out into the analysis of the anterior cruciate ligament deficiency. This method demonstrated being effective and can provide auxiliary analysis for clinical diagnosis.

scholarly journals OpenSim Versus Human Body Model: A Comparison Study for the Lower Limbs During Gait

2018 ◽  
Vol 34 (6) ◽  
pp. 496-502 ◽  
Author(s):  
Antoine Falisse ◽  
Sam Van Rossom ◽  
Johannes Gijsbers ◽  
Frans Steenbrink ◽  
Ben J.H. van Basten ◽  
...  
Keyword(s):  
Human Body ◽  
Reference Frames ◽  
Sagittal Plane ◽  
Joint Kinematics ◽  
Lower Limbs ◽  
Muscle Forces ◽  
Human Body Model ◽  
Body Model ◽  
Human Movements ◽  
Joint Center

Musculoskeletal modeling and simulations have become popular tools for analyzing human movements. However, end users are often not aware of underlying modeling and computational assumptions. This study investigates how these assumptions affect biomechanical gait analysis outcomes performed with Human Body Model and the OpenSim gait2392 model. The authors compared joint kinematics, kinetics, and muscle forces resulting from processing data from 7 healthy adults with both models. Although outcome variables had similar patterns, there were statistically significant differences in joint kinematics (maximal difference: 9.8° [1.5°] in sagittal plane hip rotation), kinetics (maximal difference: 0.36 [0.10] N·m/kg in sagittal plane hip moment), and muscle forces (maximal difference: 8.51 [1.80] N/kg for psoas). These differences might be explained by differences in hip and knee joint center locations up to 2.4 (0.5) and 1.9 (0.2) cm in the posteroanterior and inferosuperior directions, respectively, and by the offset in pelvic reference frames of about 10° around the mediolateral axis. The choice of model may not influence the conclusions in clinical settings, where the focus is on interpreting deviations from the reference data, but it will affect the conclusions of mechanical analyses in which the goal is to obtain accurate estimates of kinematics and loading.

scholarly journals Effective Descriptors for Human Action Retrieval from 3D Mesh Sequences

2019 ◽  
Vol 19 (03) ◽  
pp. 1950018
Author(s):  
Christos Veinidis ◽  
Antonios Danelakis ◽  
Ioannis Pratikakis ◽  
Theoharis Theoharis
Keyword(s):  
Human Body ◽  
Wavelet Transformation ◽  
Shape Descriptor ◽  
Human Action ◽  
Lower Limbs ◽  
3D Mesh ◽  
Salient Points ◽  
Spatio Temporal ◽  
Human Action Retrieval ◽  
3D Mesh Sequences

Two novel methods for fully unsupervised human action retrieval using 3D mesh sequences are presented. The first achieves high accuracy but is suitable for sequences consisting of clean meshes, such as artificial sequences or highly post-processed real sequences, while the second one is robust and suitable for noisy meshes, such as those that often result from unprocessed scanning or 3D surface reconstruction errors. The first method uses a spatio-temporal descriptor based on the trajectories of 6 salient points of the human body (i.e. the centroid, the top of the head and the ends of the two upper and two lower limbs) from which a set of kinematic features are extracted. The resulting features are transformed using the wavelet transformation in different scales and a set of statistics are used to obtain the descriptor. An important characteristic of this descriptor is that its length is constant independent of the number of frames in the sequence. The second descriptor consists of two complementary sub-descriptors, one based on the trajectory of the centroid of the human body across frames and the other based on the Hybrid static shape descriptor adapted for mesh sequences. The robustness of the second descriptor derives from the robustness involved in extracting the centroid and the Hybrid sub-descriptors. Performance figures on publicly available real and artificial datasets demonstrate our accuracy and robustness claims and in most cases the results outperform the state-of-the-art.

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