Movement Of Young Adults Research Articles

Kinematic differences during a jump cut maneuver between individuals with and without a concussion history.

Recent evidence suggests that athletes are at a higher risk of lower-body injuries in the months and years following a concussion. However, little is known about how people modify their movements post-concussion. This study examined kinematics during a jump cut motion in young adults with a concussion history (n=9; 4 males, 5 females; 3.1years' post-injury) and 10 controls (6 males, 4 females). Peak center of mass and peak knee angles during the landing phase of a jump-cut maneuver were evaluated. Participants with a concussion history demonstrated decreased knee varus (left: Mconc=-0.5±1.0°, Mctrl=3.6±1.0°; right: Mconc=5.1±1.2°, Mctrl=7.8±1.12°) and external rotation (left: Mconc=2.5±1.6°, Mctrl=13.0±1.5°; right: Mconc=7.7±1.6°, Mctrl=12.8±1.5°) regardless of whether the cut was oriented towards to the left or right. The kinematic patterns demonstrated in individuals with a concussion history may be suggestive of increased knee injury risk. This study adds to the growing body of literature linking orthopedic injury in those no longer displaying the acute signs and symptoms of concussion.

Psychological Benefits of the “Maker” or Do-It-Yourself Movement in Young Adults: A Pathway Towards Subjective Well-Being

Over the past several decades, increasing numbers of people have become involved in the do-it-yourself (DIY) or “Maker” movement, i.e., creating a wide range of products from home improvement to self-service to crafts. Little is known about the psychological benefits of these actions; there is an assumption that involvement ultimately increases quality of life. We surveyed 465 college students to describe their participation in a variety of Maker undertakings ranging from domestic arts, arts and crafts, to DIY activities, and examined four potential mediators of the relationship between a Maker identity and SWB. We inquired about the time spent engaged in the activities, reasons for involvement, as well as the immediate and long-term benefits received from Making. We found that college students spent approximately 3 h a week involved in Maker activities and that they most often engaged in domestic arts (e.g., cooking, baking, and gardening). The most important reasons provided for involvement in Maker activities were mood-repair, socializing with friends, and the ability to “stay present-focused.” Having a Maker identity was associated with subjective well-being (SWB), primarily explained by high arousal (i.e., exciting or stimulating) during Maker activities, but not positive mood. Trait rumination and reduced self-focus, or quiet ego, were also related to SWB and suggest the importance of reduced self-focus in understanding the relationship between Making and SWB. Taken together, it appears that Maker identity may be a potential pathway towards SWB.

Whole-body patterns of the range of joint motion in young adults: masculine type and feminine type.

BackgroundUnderstanding the whole-body patterns of joint flexibility and their related biological and physical factors contributes not only to clinical assessments but also to the fields of human factors and ergonomics. In this study, ranges of motion (ROMs) at limb and trunk joints of young adults were analysed to understand covariation patterns of different joint motions and to identify factors associated with the variation in ROM.MethodsSeventy-eight healthy volunteers (42 males and 36 females) living on Okinawa Island, Japan, were recruited. Passive ROM was measured at multiple joints through the whole body (31 measurements) including the left and right side limbs and trunk.ResultsComparisons between males and females, dominant and non-dominant sides, and antagonistic motions indicated that body structures influence ROMs. In principal component analysis (PCA) on the ROM data, the first principal component (PC1) represented the sex difference and a similar covariation pattern appeared in the analysis within each sex. Multiple regression analysis showed that this component was associated with sex, age, body fat %, iliospinale height, and leg extension strength.ConclusionsThe present study identified that there is a spectrum of “masculine” and “feminine” types in the whole-body patterns of joint flexibility. This study also suggested that body proportion and composition, muscle mass and strength, and possibly skeletal structures partly explain such patterns. These results would be important to understand individual variation in susceptibility to joint injuries and diseases and in one’s suitable and effective postures and motions.Electronic supplementary materialThe online version of this article (doi:10.1186/s40101-016-0112-8) contains supplementary material, which is available to authorized users.

Effect of Handrail Height on Sit-To-Stand Movement.

BackgroundCare-needing older adults and disabled individuals often require handrails for assistance of movements, such as sit-to-stand movements. Handrails must be set at the appropriate position; however, the effects of handrail height on joint movement and center-of-gravity movements during sit-to-stand movement remain unclear. In the present study, we sought to clarify the effects of handrail height on joint movement, center-of-gravity, and floor reaction force during sit-to-stand movement.MethodsSubjects included 16 healthy young adults and 25 older adults who require long-term care. Kinetic and kinematic measurements during sit-to-stand movement of young adults were conducted using a 3-D motion analyzer and a force plate. Trunk forward tilt angle during sit-to-stand movement of older adults was measured using a still image from a video recording.ResultsUsing low handrails, sit-to-stand movement resulted in an increased hip flexion angle, ankle dorsiflexion angle, and trunk forward tilt angle and a greater forward center-of-gravity shift than when not using handrails in young adults during seat-off. In contrast, using high handrails resulted in a smaller hip flexion angle and trunk forward tilt angle in young adults. The backward force on the floor was decreased in the low handrail condition, and was increased in the high handrail condition rather than that of sit-to-stand movement without handrails in young adults. The effect of handrail height on trunk forward tilt angle was the same in both healthy young adults and care-needing older adults during seat-off.ConclusionBecause handrail height affects joint movement and shift in the center-of-gravity during sit-to-stand movement, handrail position should be selected to match the status of older adults with functional impairment.

Effects of visual display terminal works on cervical movement pattern in patients with neck pain.

[Purpose] This study examined changes in the onset of neck movement in young adults with and without mild neck pain (MNP) during visual display terminal (VDT) work. [Subjects] Ten control subjects and 10 subjects with MNP who were VDT workers were recruited. The upper (UC) and lower cervical (LC) spine angles in the sagittal plane were collected using an ultrasound-based motion analysis system during VDT work for 5 min. [Results] The MNP group had faster movement initiation in the UC and LC compared with the control group during VDT work. [Conclusion] These findings suggest that young adults with MNP should be cautious when performing VDT work while sitting.

Youth and the 21<sup>st</sup> Century South-North Migration: In Search of a More Relevant Perspective on Causes, Trend and Flow

Advancement in communication and transport technologies has reduced the world to a global community. This has also improved and therefore increased potentials for the movement of individuals, commodities, and capitals across international borders as they respond to global political and socio-economic stimuli. It is apparent though, that transnational borders are relatively more open to capital and commodities than they are to migrant individuals. However, there are vast literature and data on the socio-political and economic dimensions of adults’ involvement in international migration. But the youth are treated as part of their families; hence very few literatures that devoted to youth migration exist. But movement of young adults as independent transnational migrants is an emerging trend in international migration. In this paper, I examined existing perspectives on causes, trend and flow of the 21st century youth transnational migration with a view to providing appropriate lenses for understanding the phenomenon, particularly as it affects the contemporary massive flow of youth from developing African economies to the industrialized Europe. Reviewed literature focused on the “push and pull” factors considered to be wielding major influence on migration-decisions of transnational migrant subjects. Push and pull approaches essentially construct immigrants as problems to receiving countries. This paper advances the understanding of youth migration from indigenous and anti-colonial perspective in order to disrupt and disturb existing approaches and give a more pellucid lens for understanding this emerging social trend. Significant attempt was made in this paper to highlight the often overlooked outcome of transnational migration which, to the sending and receiving nations, has both positive and negative reflexes. The underlying assumption of the theoretical approach is that any appropriate theory that will inform meaningful migration policy formulation on youth transnational-migration experiences, must consider the cultural environment of these youth. It must as a matter of necessity consider the influence of colonization and neo-colonial processes on their remote social spaces, and engage relevant strategies to establish ways in which reinventing the indigenous worldviews subverted by colonization can equip and empower local youth, thereby balancing, if not reducing the negative trend in transnational youth migration.

The influence of dual-task conditions on movement in young adults with and without Down syndrome

This investigation compared spatial and temporal movement parameters of a sample of young adults with Down syndrome (DS) (N=12) and individuals without disabilities (IWD) (N=12) under dual-task conditions. Subjects performed a walking task at a preferred speed in isolation and again while holding a plate and cup, carrying tray and cups, talking on a phone, or buttoning a shirt. Spatial and temporal values were compared using a 2 (group) × 5 (conditions) repeated measures analysis of variance. Analysis of spatial components separately indicated that step length, step width, stride length and stride width revealed significant group and condition interactions (p ≤.01). Temporal components yielded significance in velocity and single-leg support time (p ≤.01). The current results support the notion that along with impairments to qualitative motor skills, individuals with DS are also impaired in higher order executive functioning (EF), as measured by a dual-task paradigm. It was concluded that movements are less efficient and functional in individuals with DS when an additional task is encountered while walking. We theorized that the motor program was sufficient for general locomotion but was not sufficiently developed to allow individuals with DS to modify or alter their movements to changing cognitive conditions that increasingly taxed EF. As gait and balance are trainable in this population, we recommend developing appropriate exercise and motor skill interventions during childhood and adolescents to increase strength, stability, and more "robust" ambulatory motor schema.

Association between occlusal curvature and masticatory movements with different test foods in human young adults with permanent dentitions

ObjectiveOcclusal curvatures such as the curve of Spee, curve of Wilson and Monsons's sphere exist in the human adult mandibular arch. A previous study showed that human young adults with flatter occlusal curvatures had higher ability of food comminution and mixing. The aim of this study was to clarify functional significance of occlusal curvatures in terms of masticatory movements. This study investigated the association between occlusal curvature and mandibular movements while chewing a variety of food items. DesignForty-six young adults with complete dentitions (mean age, 25.0 years) participated in the study. Sphere radius of occlusal curvature was determined by a three-dimensional analysis of the mandibular arch based on the Broadrick flag method. Mandibular movements during unilateral chewing of six test food items (chewing gum, cheese, kamaboko, boiled beef, gummy jelly and raw carrot) until the subjects felt ready to swallow were recorded using a six-degrees-of-freedom mandibular movement recording system, and 11 parameters for masticatory movements of a lower incisal point of the mandible were analysed. ResultsLinear regression analyses identified the sphere radius as a significant predictor for closing velocity in all test food items, occluding/cycle duration in 3 items, opening velocity, closing duration and chewing time in 2 items, and opening duration in 1 item (P<0.01). The results suggest that subjects with larger sphere radius (flatter occlusal curvature) in the mandibular arch could prepare food bolus effectively for swallowing. ConclusionOcclusal curvature seems to be associated with masticatory movements in young adults with permanent dentition.

Relationship between quality of life with ambulation status and lower limb range of motion in young adults with spastic cerebral palsy.

Introduction : Consequences of cerebral palsy can cause significant influences on physical and psychological capabilities of adults with cerebral palsy and affect on their quality of life. The purpose of this study was to investigate the relationship between quality of life with hypertonia and ambulation status in young adults with spastic cerebral palsy. Materials and Methods : In an analytical cross sectional study, 70 participants (40 women ،30 men, age range 20 to 40 years, mean age + SD, 26.24 ± 5.07) with spastic cerebral palsy were recruited in this study. They were selected from three Ra’ad Rehabilitation Goodwill Complexes in Tehran and Karaj cities. Quality of life (QOL), ambulation status, knee extension, and ankle dorsi flexion range of motion were measured by World Health Organization Qualit of life questionnaire (WHOQOL- BREF), functional ambulation category and manual goniometer, respectively. To analyze the data, Pearson and spearman correlation coefficient, Mann-Whitney U test, Independent sample T test were used. Results : We found no correlation between ambulation status and ankle dorsi flexion range of motion with quality of life domains. However, psychological and environmental domains showed low correlations with knee extension range of motion (respectively r = 0.26 and r = 0.28). Also, no significant difference was found between males and females in QOL domain scores. Conclusion : Probably knee extension range of motion could affect on psychological and environmental domains in adults with spastic cerebral palsy. Also, impairments and physical limitations seems to have a less pronounced effect on health-related quality of life in adults with cerebral palsy. Keywords : Quality of life, Ambulation status, Range of motion, Cerebral palsy

Dynamics of posterior tongue during pronunciation and voluntary tongue lift movement in young adults

The lifting-up movement of the posterior part of the tongue to touch the palate, which is a requirement for performing physiological functions such as deglutition and speech, is an important phenomenon that is difficult to objectively evaluate. The purpose of this study was to develop a new modality to evaluate the tongue-lifting function, especially in the posterior part of the tongue, and to elucidate the dynamic properties of the tongue in normal subjects. Twenty-three healthy volunteers (9 men and 14 women; mean age, 27·6years) participated in this study. A new device was developed that could evaluate the up-down movement of the posterior part of the tongue in a non-invasive manner. The experimental tasks were as follows: (i) /a/ pronunciation for 1s followed by /ka/ pronunciation (a-ka task), (ii) /a/ pronunciation for 1s followed by /ga/ pronunciation (a-ga task) and (iii) /a/ pronunciation for 1s followed by a voluntary push-up movement of the posterior part of the tongue (a-lift task). Maximum upward velocity in the a-ga task was larger than that in the a-ka task (P<0·05). The a-lift task showed the highest tongue lift range among the three tasks, and the a-ga task showed a higher range than that of the a-ka task (P<0·05). This study revealed that precise quantification of the motility of the posterior part of the tongue, which would be useful in rehabilitation of articulation and/or swallowing, could be achieved using this new device in a non-invasive manner.

Femoroacetabular Impingement Magnetic Resonance Imaging

Femoroacetabular impingement (FAI) of the hip joint is increasingly being recognized as one of the causes of hip pain and restriction of hip motion in young adults. The main subtypes are Pincer and Cam types. MRI digagnostic and relevant surgical information is presented.

Experience-Dependent Eye Movements Reflect Hippocampus-Dependent (Aware) Memory

We investigated the relationship between experience-dependent eye movements, hippocampus-dependent memory, and aware memory. We measured eye movements in young adults, older adults, and memory-impaired patients with damage to the medial temporal lobe as they viewed 120 novel scenes and 120 previously viewed scenes. Participants indicated if each scene was old or new and also gave a confidence rating for the memory judgment. Young adults and older adults explored old scenes less than they explored new scenes, but the patients did not. For the young and older adults, this effect was observed only when participants were aware of the scene's familiar or novel status. In a second experiment, young adults viewed scenes that were either new, had been viewed previously, or had been viewed previously but had been changed (i.e., an object within the scene was either added or removed). The only instructions were to pay attention to the scenes and view each scene as it appeared, and there was no expectation that memory would be tested. Directly after the first altered scene was presented, participants were asked to classify the scene as new, old, or old but changed. Participants who were aware of the manipulation preferentially viewed the changed region, but participants who were unaware did not. These findings suggest that experience-dependent eye movements reflect hippocampus-dependent (and aware) memory, even when participants have no expectation that memory is being tested; and they are consistent with the view that awareness of what is learned is a fundamental characteristic of hippocampus-dependent memory.

Quantitative Analysis of the Variability of Unilateral Chewing Movements in Young Adults

Kinesiography can be used as a diagnostic tool in a dental clinic context. In the current study, a kinesiograph was used to detect and record the three-dimensional motion of the mandibular mid-incisor point during unilateral chewing as a function of time. The aim of the study was to quantify the within-subject short-term reproducibility of the kinesiographic recordings in normal, healthy subjects. Ten seconds of unilateral (right and left) gum chewing were recorded in 20 control subjects using computerized kinesiography. Each subject performed 18 chewing sequences (three repetitions x three sessions x two sides). Chewing cycle duration, volume, standardized depth and width, and the number of reversed cycles were calculated. Intraclass correlation coefficients (two-way random effects analysis of variance with interactions) and paired t-tests were used to compare sessions. For each subject and side, chewing variability was expressed as the coefficient of variation (percentage ratio of standard deviation to mean) of each variable. Mean left and right side mastications were computed over all sessions and subjects. For all the analyzed variables, larger variations between subjects (analysis of variance, p<0.001) than between sessions were found, with intraclass correlation coefficients ranging between 0.432 (left side cycle duration) and 0.989 (right side standardized width). No systematic errors between the three measurement sessions were found for cycle volume and shape (paired t, p>0.05). The highest between subjects/ between sessions variance ratios (up to 223.28) were found for cycle duration and shape. In all subjects, chewing cycle volume was very variable, with mean coefficients of variation up to 47% (left side in females). Cycle duration and standardized depth and width were more reproducible, with mean coefficients of variation up to 10% (duration), 14% (standardized width), and 18% (standardized depth). The spatial characteristics of gum chewing cycles had a large within-subject variability. The temporal and size-standardized (shape) characteristics were more consistent within subject. The results should allow selection of a set of relatively more consistent variables for the definition of normality and the comparison of patients.

A Kinematic Analysis of How Young Adults with and Without Autism Plan and Control Goal-Directed Movements

We examined the planning and control of goal-directed aiming movements in young adults with autism. Participants performed rapid manual aiming movements to one of two targets. We manipulated the difficulty of the planning and control process by varying both target size and amplitude of the movements. Consistent with previous research, participants with autism took longer to prepare and execute movements, particularly when the index of difficulty was high. Although there were no group differences for accuracy, participants with autism exhibited more temporal and spatial variability over the initial phase of the movement even though mean peak accelerations and velocities were lower than for control participants. Our results suggest that although persons with autism have difficulty specifying muscular force, they compensate for this initial variability during limb deceleration. Perhaps persons with autism have learned to keep initial impulses low to minimize the spatial variability that needs to be corrected for during the online control phase of the movement.

Evaluation and treatment of young adults with femoro-acetabular impingement secondary to Perthes disease

Hip pain and loss of motion in young adults with previous Legg-Calve-Perthes-Disease may be caused by anterior femoro-acetabular impingement. Eleven patients (12 hips) with the chief complaint of groin pain and significant proximal femoral deformity were treated. Gadolinium-enhanced magnetic resonance arthrography in ten patients indicated labral injury and adjacent acetabular cartilage lesions in nine hips. A surgical dislocation of each hip confirmed that there was impingement induced intra-articular injury consistent with the pathology indicated on the MRI. Reshaping of the femoral head, with correction of the femoral head/neck offset, and treatment of the acetabular rim pathology was performed for each hip in conjunction with other procedures for the proximal femur. Correction of the impingement and increased range of motion could be visualized intra-operatively. At a mean follow-up of 33 months, half of all patients were pain-free and all had improvement in pain compared with preoperatively. Ten patients had an improved range of motion and two a slight decrease. No additional necrosis following the dislocation of the femoral head was seen.;

Evaluation and Treatment of Young Adults with Femoro-Acetabular Impingement Secondary to Perthes' Disease

Hip pain and loss of motion in young adults with previous Legg-Calve-Perthes-Disease may be caused by anterior femoro-acetabular impingement. Eleven patients (12 hips) with the chief complaint of groin pain and significant proximal femoral deformity were treated. Gadolinium-enhanced magnetic resonance arthrography in ten patients indicated labral injury and adjacent acetabular cartilage lesions in nine hips. A surgical dislocation of each hip confirmed that there was impingement induced intra-articular injury consistent with the pathology indicated on the MRI. Reshaping of the femoral head, with correction of the femoral head/neck offset, and treatment of the acetabular rim pathology was performed for each hip in conjunction with other procedures for the proximal femur. Correction of the impingement and increased range of motion could be visualized intra-operatively. At a mean follow-up of 33 months, half of all patients were pain-free and all had improvement in pain compared with preoperatively. Ten patients had an improved range of motion and two a slight decrease. No additional necrosis following the dislocation of the femoral head was seen.;

Health Care Transition: Destinations Unknown

The movement of young adults with special health care needs from pediatric-oriented care to adult-oriented care has been a growing concern in the health care literature over the past 20 years. This article reviews the development and evaluation of health care transition policy over that period of time. These health care transition policies are discussed in light of the preliminary results from a qualitative study of the experience of health care transition. This article concludes with suggestions regarding future policy development and research efforts around health care transition.

9 特定年齢集団におけるタッピング運動時の咀嚼筋EMGパラメータの分布(第469回 大阪歯科学会例会)

9 特定年齢集団におけるタッピング運動時の咀嚼筋EMGパラメータの分布(第469回 大阪歯科学会例会)

Destribution of masticatory electromyograph parameters during the tapping movement in young adults

Destribution of masticatory electromyograph parameters during the tapping movement in young adults

Sex difference of electromyogram of masticatory muscles and mandibular movement during chewing of food

The aim of this study was to investigate whether there were sex differences in the electromyograms (EMG) of the masticatory muscles and in the mandibular movement of young adults when chewing food. Twenty subjects with normal dentitions were selected. The 11 test foods selected were all easily available in Japan. The results showed firstly that although there were no significant differences of chewing frequency between males and females, females chew food more slowly with less masticatory force and narrower mouth opening width than males; and secondly it appears that the chewing function in females is lower than in males.