Search

BACKGROUND: Although millions of people with osteoarthritis (OA) have altered biomechanical alignment, movement, and knee joint pain during gait, there are no effective and sustainable interventions. To mitigate such impairments, we developed an untacted self-automated robotic and electromyography (EMG)-augmented upper-trunk-lower reciprocal locomotor training (SRGT) intervention. OBJECTIVE: To compare the effects of SRGT and conventional treadmill gait training (CTGT) on the medial knee joint space width (JSW), hip adduction moment (HAM), knee varus deformity, pain, and physical function in community-dwelling older adults with OA. METHODS: Older adults diagnosed with medial compartment knee OA (5 men, 35 women; mean age = 78.50 ± 9.10 years) were recruited and underwent either SRGT or CTGT, 30 min a day, 3 times a week, over a 4-week period. Outcome measurements included the JSW, HAM, knee varus angle (VA), and Western Ontario McMaster Universities osteoarthritis index (WOMAC). RESULTS: Analysis of covariance (ANCOVA) showed that SRGT ed to greater changes in medial knee JSW (p= 0.00001), HAM (p= 0.00001), VA (p= 0.00001), and WOMAC (p= 0.00001) scores. CONCLUSION: This study provides the first evidence for the long-term clinical and biomechanical effects of SRGT on JSW, knee joint kinematics, kinetics, and WOMAC scores in older adults with OA. Most importantly, self-automatic robotic gait training may be an alternative, effective, and sustainable treatment for the upper-trunk-lower reciprocal locomotor training in older adults with OA.

BACKGROUND: Although the instrument-assisted manual (IM) technique has been widely utilised to improve soft tissue and joint mobility, its therapeutic benefits and underlying neuromechanical mechanisms remain unknown compared to those of conventional static stretching (SS) and hold-relax (HR) manual techniques. OBJECTIVE: This study aimed to compare the effects of the SS, HR, and IM techniques on muscle activity, kinematics, and strength during deep squatting in limited ankle dorsiflexion (DF) syndrome. METHODS: This was a cross-sectional randomised controlled study including 39 adults divided into three groups: SS group: 13, HR group: 13, IM group: 13. Outcome measures were the tibialis anterior (TA): gastrocnemius (GCM) balance ratio and ankle, knee, hip and thoracolumbar junction angles. TA muscle strength was analysed to evaluate the limited ankle DF. Analysis of variance was performed, with P< 0.05. RESULTS: The TA:GCM balance ratio, ranges of motion of ankle DF and knee flexion, and TA muscle strength in the IM group improved significantly compared to that in either the SS group or HR group (P< 0.05). CONCLUSIONS: Our novel results demonstrated that IM was most effective in normalising TA:GCM balance, ankle DF range of motion, and TA muscle strength during deep squatting in adults with limited ankle DF.

The purpose of this study is to investigate how the pain and physiological characteristics of the trapezius change when the Winback therapy is applied to the trapezius in patients with work-related musculoskeletal disorders (WMSDs). This study was conducted on 30 healthy adults living in Jeju Island. After applying the Winback 3SE high-frequency equipment developed in France, the muscle tone, muscle stiffness, pressure pain threshold, and visual analog scale (VAS) of the trapezius were measured. After the intervention, muscle tone decreased from 16.15 ± 2.02 to 14.22 ± 1.83, muscle stiffness decreased from 285.81 ± 58.26 to 245.83 ± 51.62, pressure pain threshold increased from 62.58 ± 23.28 to 79.38 ± 28.27, and VAS decreased from 3.73 ± 0.73 to 1.01 ± 0.02. These improvements were statistically significant (p

Both iliopsoas (IL) and quadratus lumborum (QL) muscle tightness are associated with lower back pain, which limit activities of daily life, such as squatting and walking. High-frequency diathermy (HFD) treatment generates heat as a result of molecular vibrations in deep soft tissues. HFD increases blood flow and tissue flexibility following muscle relaxation, and improves pain thresholds by lessening pain and facilitating maximum muscle stretch without destruction. We examined the effectiveness of HFD therapy on pain in the IL and QL in nonsymptomatic participants with IL tightness. A convenience sample of 15 nonsymptomatic participants with IL tightness ([Formula: see text], [Formula: see text] years) was recruited, based on participants obtaining a positive value on the Thomas test. The treatment was applied to each muscle (IL and QL) for 15[Formula: see text]min: 5[Formula: see text]min of capacitive mode was applied, and 10[Formula: see text]min of resistive mode was subsequently applied using the WINBACK tool. The whole participants were assessed pre- and post-intervention. Clinical variables contained visual analog scale (VAS) scores. The Wilcoxon signed-rank test was used to analyze the VAS scores, to determine whether HFD influenced pain control. The alpha value was set at 0.05. A significant reduction in IL and QL pain was observed when HFD was applied to participants ([Formula: see text]). Our findings offer therapeutic proof that HFD is effective in controlling IL and QL pain in participants with IL tightness.

BACKGROUND: Impaired sensory in acute stroke patients results in dynamic balance, gait and activities of daily living (ADL) impairment. OBJECTIVE: The aim of present study was to examine the correlation between somatosensory-evoked potential (SSEP) parameters and motor recovery in balance, gait and ADL performance in hemiparetic stroke survivors. METHODS: One hundred and one participants with hemiparetic stroke (43 males, 58 females; mean age, 6538 ± 1222 years; post-stroke duration, 199 ± 0.74 month) participated in this study. The Electro Synergy system (Viasys Healthcare; San Diego, CA, USA) was applied to measure SSEP measurement. The 101 stroke survivors were divided into three groups consistent with their SSEP results: sensory normal group; sensory impaired group; sensory absent group. All the subject participated the inpatient rehabilitation intervention for 4 weeks. Analyses of variance (ANOVA) were used to verify the group difference among the three groups after the treatment. RESULTS: ANOVA revealed the significant difference (p< 0.01). The Scheffe test demonstrated that the sensory normal group showed greater increasement in Modified Barthel Index (MBI), Fugl-Myer Assessment (FMA), Trunk Impairment Scale (TIS), Berg Balance Scale (BBS) and Functional Ambulation Category (FAC) scores than the sensory impaired and absent group (p< 0.05). CONCLUSIONS: Our research provides therapeutic evidence that correlation of somatosensory functions on motor recovery, balance, gait, and ADL in patients with hemiplegic stroke.

How are people of Asian origin perceived in contemporary U.S. culture? While often depicted as a “model minority”—competent and hardworking but also quiet, unsociable, or cold—little work measures whether and how these stereotypes vary for Asians in different social locations. We use a large (n ≈ 4,700) quota sample of the United States, matched to key U.S. demographics, to map the content of Asian stereotypes across ethnicity, gender, income, and birthplace. We find that some stereotypes are largely consistent across subgroups—such as the perception that Asians lack sociability, but not warmth, relative to White Americans—while others vary substantially. Perceptions of dominance vary by income, while perceptions of competence are moderated by income and ethnicity in complex ways. Stereotypes have important consequences, ranging from everyday frustrations to depressive symptoms and employment discrimination. Our work provides a detailed picture of how stereotypes vary across social locations.

Core stability mediated by the abdominal draw-in maneuver (ADIM) has been proven to be an important component of neuromuscular motor control before movement. However, no previous research has investigated which position is best for performing ADIM to achieve optimal core stability. This study aimed to define the effectiveness of performing ADIM in three different positions (prone, supine, and hook lying) on abdominal muscle thickness in nonsymptomatic participants. In total, 30 nonsymptomatic participants (mean age: [Formula: see text] years) were randomly assigned to a trial sequence using the random sequence method. The clinical outcomes were transverse abdominis (TrA), external oblique (EO), and internal oblique (IO) muscle thicknesses, which were evaluated using ultrasonography (US) and muscle thickness balance ratio. One-way repeated-measures analysis of variance (ANOVA) was used to evaluate the US data to determine if the resulting TrA, IO, and EO muscle thicknesses from the three different positions were statistically significant. Bonferroni correction was used as a post hoc test if statistical significance was found. The [Formula: see text] value was set to 0.013. One-way ANOVA showed a significant difference in the thickness of the TrA, IO, and EO muscles resulting from the different positions ([Formula: see text]). Post hoc analysis using Bonferroni correction revealed that the prone position resulted in greater changes than the supine and hook-lying positions ([Formula: see text], respectively). ANOVA did not show a significant change in the TrA, IO, and EO muscle thickness balance ratios ([Formula: see text], 0.44, and 0.59, respectively). The results provide innovative clinical evidence that performing ADIM in different positions (prone, supine, and hook lying) has different effects on abdominal muscle thickness in nonsymptomatic participants.

BACKGROUND: Although patients with frozen shoulders have the range of motion (ROM) of their shoulder’s abduction movements measured at hospital and the physical therapy visits, multiple visits to check for progress is often difficult. Thus, we developed an artificial intelligence-based image recognition detectable sensor (AIRDS) intended for easy use at home. OBJECTIVE: The purpose of this study was to determine the accuracy of a sensor (AIRDS) measuring shoulder abduction angle, thus offering a valid and feasible system for monitoring patients with frozen shoulder. METHODS: Ten patients with frozen shoulder (5 males, 5 females) performed shoulder joint movements while being measured with the AIRDS system and the 3-dimensional Vicon system. The measure of the outcome included the linear regression of the shoulder abduction joint kinematics. RESULTS: Linear regression analysis of the AIRDS system and the Vicon system demonstrated a significant correlation coefficient of R2= 0.9979 (P< 0.05). CONCLUSIONS: Our results provide novel, promising evidence that AIRDS can accurately measure the timing and total spatial characteristics of clinical movements. AIRDS is designed to provide real-time ROM measurements for joint mobility using artificial intelligence instead of the judgement of the physical therapist.

Knee osteoarthritis (OA) is a degenerative articular disease. The knee joint space width (JSW) is used for grading the severity of knee OA. However, there is a lack of research on differences in the widths of knee joints between both lower limbs in unilateral OA. The purpose of this research was to examine the radiological difference in the affected knee joint and contralateral knee joint by analyzing unilateral older adults with medial knee OA using both knees’ JSW differences. Twenty-five subjects with unilateral medial knee OA participated. X-ray radiographs were used to assess knee JSW, and the paired [Formula: see text]-test was performed to assess the knee joint gap width between the affected side and the unaffected side in the respective medial and lateral sides. The independent [Formula: see text]-test compared the differences between the lateral and medial knee JSWs on the affected side and unaffected side. The paired [Formula: see text]-test did not show a significant difference in the medial and lateral knee JSW on the affected side compared to the unaffected side ([Formula: see text]; 0.11). Meanwhile, the independent [Formula: see text]-test revealed a significant difference between the affected and unaffected sides ([Formula: see text]). This study showed no significant changes in affected knee JSWs compared to unaffected sides, but the difference between the lateral and medial JSWs was significant between the knees affected and unaffected by OA in the older adults with medial knee OA.

While the presence of dynamic neuromuscular stabilization (DNS) has been provided as an important component of the integrated spinal stabilization and associated abdominal stabilization prior to dynamic movement, no previous study has investigated the spinal mechanical effects scoliosis and pain control in youth baseball player with scoliosis. This study compared the effects of gymball exercise, with and without DNS core stability exercise, on spine kinematics and pain control in youth baseball player with scoliosis. A total of 28 participants with scoliosis were randomized into gymball exercise, with and without DNS core stability exercise. Clinical outcomes included the Cobb’s angle and visual analog scale (VAS). Two-way repeated analysis of variance (ANOVA) was conducted at p

The importance of core stabilization exercises for extremities associated with dynamic spinal stabilization prior to movement has been demonstrated. However, no previous studies have investigated the muscle-coordinated effects on the upper trapezius (UT), anterior deltoid (AD), pectoralis major (PM), bilateral transverse abdominis (TrA), bilateral internal oblique (IO), and bilateral external oblique (EO) in healthy adults. The purpose of this study was to compare the effects of the dynamic neuromuscular stabilization (DNS) breathing technique and the abdominal bracing (AB) technique on UT, AD, PM, bilateral IO/TrA, and bilateral EO motor control in healthy participants during horizontal shoulder adduction. Thirty-six participants, eight of whom were female, were randomized into an AB and a DNS group and performed horizontal shoulder adduction with loads (8 and 17 lb). The clinical outcomes were UT, AD, and PM muscle activation and TrA/IO and EO muscle activation. Paired t-tests were used to analyze electromyography (EMG) data to determine statistically significant differences in muscle activity between the two techniques. For the EMG analysis, the maximal voluntary isometric contraction was measured for normalization and then divided by the EMG amplitude value. The results showed that UT, AD, and PM muscle amplitudes were lower and TrA/IO and EO muscle amplitudes were higher with DNS than with AB ([Formula: see text]). Our findings provide clinical evidence that core exercise with DNS is more effective in lessening UT, AD, and PM muscle activation and improving bilateral TrA/IO motor control than with AB.

Drawing on institutional theories of corporate response to the law, the authors investigate if and how employment discrimination litigation promotes gender and race equality among targeted firms. Using data on 171 high-profile sex and race discrimination lawsuits settled against publicly traded companies between 1997 and 2007, the authors estimate the impact of lawsuit resolutions on subsequent changes in managerial sex and race composition. Results show that the impact of lawsuit resolutions depends on the conditions surrounding the resolution. Lawsuit resolutions that produce a drop in stock prices for defendants, attract national media coverage, and mandate organizational policy changes improve white women’s, black women’s, and black men’s access to management, while those that involve costly monetary payouts have no or negative effects. These findings demonstrate how market and legal pressures interact to affect workplace practices and managerial diversity.

Although complying with and monitoring court-mandated changes in organizations’ policies following employment discrimination lawsuits can be costly to both employers and taxpayers, little is known about the impact of such mandates on increasing sex and race managerial diversity in organizations. Using data on approximately 500 high-profile employment discrimination lawsuits resolved in U.S. federal courts between 1996 and 2008, the authors estimate the impact of court-mandated policy changes on shifts in the presence of white women, black women, and black men in managerial positions. Policies designed to reduce bias expand opportunities for white women but not for other demographic groups. By contrast, opportunities in management for all groups expand when policies are designed to increase organizational accountability by establishing specific recruitment, hiring, or promotion plans and monitoring arrangements. Policies designed to increase rights’ awareness are associated with declines in managerial diversity. Notably, compared with verdicts and settlements with modest penalties, those with the most costly monetary payouts do not expand managerial diversity; and in fact, they can backfire.

We assess how changes in the social organization and compensation of work hours over the last three decades are associated with changes in wage differentials among mothers, fathers, childless women, and childless men. We find that large differences between gender and parental status groups in long work hours (fifty or more per week), coupled with sharply rising hourly wages for long work hours, contributed to rising gender gaps in wages (especially among parents), motherhood wage penalties, and fatherhood wage premiums. Changes in the representation of these groups in part-time work, by contrast, is associated with a decline in the gender gap in wages among parents and in the motherhood wage penalty, but an increase in the father-hood wage premium. These findings offer important clues into why gender and family wage differentials still persist.

Hyperpronation of the foot is believed to contribute to ankle hypermobility and associated stiffness reduction, but the underlying biomechanical mechanisms remain unknown. This study aimsed to investigate multidirectional ankle displacement and associated stiffness when a posterior–anterior impact force was applied to the posterior knee compartment. Forty healthy adults with and without foot hyperpronation were recruited. A three-dimensional motion capture system and force plates were used to acquire angular displacement and ankle joint moment data. The independent [Formula: see text]-test and Mann–Whitney [Formula: see text] test were used to compare the group differences in ankle angular displacement, moment, and stiffness. Spearman’s rho test was performed to determine the relationship between ankle angular displacement and stiffness. The hyperpronation group demonstrated significantly greater sagittal ([Formula: see text]) and frontal plane ([Formula: see text]) angular displacements and reduced sagittal plane ankle stiffness ([Formula: see text]) than the neutral group. The Spearman’s correlation analysis showed a close inverse relationship between the ankle angular displacement and stiffness, ranging from [Formula: see text] to [Formula: see text]. The biomechanical data in our study suggest that individuals with foot hyperpronation present with multidirectional hypermobility and a reduction in ankle stiffness. These factors contribute to an increased risk of ankle-foot injury in individuals with foot hyperpronation.

In this study, we examine the financial impact of employment discrimination lawsuit verdicts and settlements on publicly traded firms subject to lawsuits between 1997 and 2008. Using data on 174 sex and race discrimination lawsuits involving 107 publicly traded companies, we assess the effect of lawsuit verdicts and settlements on changes in defendants’ daily stock returns. Findings indicate that verdicts and settlements have an immediate negative impact on defendants’ stock prices. In addition, the negative effect is more pronounced among cases that involve monetary payouts, cases in which the U.S. Equal Employment Opportunity Commission is a plaintiff and cases that involve sex as opposed to race or national origin discrimination. These results demonstrate the extent to which legal rulings introduce a market penalty for employers and have implications for the study of law, organizations, and market responses to discriminatory behavior.

Despite rapid changes in women’s educational attainment and continuous labor force experience, convergence in the gender gap in wages slowed in the 1990s and stalled in the 2000s. Using CPS data from 1979 to 2009, we show that convergence in the gender gap in hourly pay over these three decades was attenuated by the increasing prevalence of “overwork” (defined as working 50 or more hours per week) and the rising hourly wage returns to overwork. Because a greater proportion of men engage in overwork, these changes raised men’s wages relative to women’s and exacerbated the gender wage gap by an estimated 10 percent of the total wage gap. This overwork effect was sufficiently large to offset the wage-equalizing effects of the narrowing gender gap in educational attainment and other forms of human capital. The overwork effect on trends in the gender gap in wages was most pronounced in professional and managerial occupations, where long work hours are especially common and the norm of overwork is deeply embedded in organizational practices and occupational cultures. These results illustrate how new ways of organizing work can perpetuate old forms of gender inequality.

This study investigates whether the increasingly common trend of working long hours (“overwork”) perpetuates gender segregation in occupations. While overwork is an expected norm in many male-dominated occupations, women, especially mothers, are structurally less able to meet this expectation because their time is subject to family demands more than is men’s time. This study investigates whether the conflicting time demands of work and family increase attrition rates of mothers in male-dominated occupations, thereby reinforcing occupational segregation. Using longitudinal data drawn from the Survey of Income and Program Participation, I show that mothers are more likely to leave male-dominated occupations when they work 50 hours or more per week, but the same effect is not found for men or childless women. Results also show that overworking mothers are more likely to exit the labor force entirely, and this pattern is specific to male-dominated occupations. These findings demonstrate that the norm of overwork in male-dominated workplaces and the gender beliefs operating in the family combine to reinforce gender segregation of the labor market.

This article investigates structural sources of earnings losses in the U.S. labor market, analyzing data from the Outgoing Rotation Groups and Displaced Worker Supplements of the 2003–2008 Current Populations Survey. After introducing the data and methodology, a descriptive model of inter-industry earnings differentials in the full labor market between 2003 and 2008 is presented to motivate a baseline claim that industry of employment represents a salient partition of the distribution of good and bad jobs over this time period. Then, the current wages of two groups of workers in 2006 and 2008, who were displaced from their jobs in the prior 3 years, are modeled. Earnings losses of re-employed workers are analyzed, conditional on re-employment in alternative industries, while simultaneously adjusting for observed determinants of selection into employment. The findings demonstrate that displaced workers who are then re-employed suffer from earnings losses in their new jobs. These losses are larger among those who switch industries, especially among those who move to traditional low-wage industries in the service sector. The losses are also larger for those who held their prior jobs for 3 or more years, and they cannot be explained away by differences in the skill requirements between the jobs from which individuals are displaced and those in which they are re-employed. The findings are discussed with reference to structural theories of labor market inequality from sociology and economics, which represent valuable complementary perspectives to individualistic skill-based accounts of earnings differences.

This study examines whether long work hours exacerbate gender inequality. As working long hours becomes increasingly common, a normative conception of gender that prioritizes men’s careers over women’s careers in dual-earner households may pressure women to quit their jobs. I apply multilevel models to longitudinal data from the Survey of Income and Program Participation to show that having a husband who works long hours significantly increases a woman’s likelihood of quitting, whereas having a wife who works long hours does not appear to increase a man’s likelihood of quitting. This gendered pattern is more prominent among workers in professional and managerial occupations, where the norm of overwork and the culture of intensive parenting are strong. Furthermore, the effect is stronger among workers who have children. Findings suggest that overwork can reintroduce the separate spheres arrangement, consisting of breadwinning men and homemaking women, to many formerly dual-earner households.

This paper reviews recent research on employment discrimination on the basis of sex, race, and ethnicity in US work establishments. Unlike blatant discrimination of the past, contemporary discrimination is typically more subtle, often unintentional, and develops in relationship to the social context in which it is embedded. Focusing on this covert and dynamic nature of discrimination, we review recent research that identifies factors at the individual, workplace, and societal level that contribute to variation in sex and race discrimination across employment contexts. At each level, we conceptually distinguish between factors that influence employers’ sex and race biases and factors that affect potential victims’ capacity to identify discriminatory experiences at work.

Abundant research has found that men's economic status shapes their gender ideology such that men who are breadwinners are less likely to endorse egalitarian ideology than men in nontraditional arrangements. This article investigates how the association between men's breadwinning status and gender ideology is influenced by the institutional arrangements of different types of labor markets. Rigid labor markets support men's ability to be breadwinners in the long term, whereas flexible labor markets provide men with more frequent, but less permanent, experiences of nontraditional arrangements. The authors anticipate that breadwinner status will have stronger effects on men's gender ideology in rigid labor markets because men can expect less fluctuation in their employment situations in those contexts. Results from a multilevel analysis of 27 countries indeed demonstrate that individual men's economic dependency on their partners influences men's gender egalitarian ideology more strongly in rigid labor markets than in flexible markets.

In this article, the authors present the rent destruction explanation for recent increases in inequality, which can be seen as one facet of a broader sociological explanation focused on class-biased structural change. A sociological depiction of the growth of earnings inequality since the early 1980s is presented using alternative partitions of the labor market, including the dominant sociological class schema that (surprisingly) has been used rarely to describe these trends. Thereafter, the authors attempt to strengthen the evidence for the rent destruction explanation by examining the increase in wealth inequality in the 1990s. After presenting these empirical findings, they discuss the extent to which rent destruction can account uniquely for these patterns, as well as other complementary sociological research on the growth of inequality.