Quantification of hand grasp force using a pressure mapping system

The goal of this study was to use a pressure sensor to measure the force distribution and contact area of the hand when gripping, pushing, and pulling a cylinder. Data was collected from 10 subjects with no hand impairments and from 1 subject with rheumatoid arthritis (RA). Subjects grasped an aluminum cylinder wrapped with a Tekscan pressure sensor and performed each trial at 25%, 50%, and 100% maximum voluntary exertion. A relationship was found between increasing exertion and increasing hand area with increasing hand contact area. The force distribution maps showed the thenar region of the hand exerts the most force during pushing while the metacarpal joint line exerts the highest force during pulling. The third and fourth phalange were found to exert the highest phalange force during gripping. The force distribution maps from the RA subject showed higher thumb forces and distal phalange forces, relative to the entire phalange, compared to the non-impaired subjects. This suggests that the RA subject compensates for the lack of phalange function with the regions of the hand that still function. Future studies should sample individuals with a larger hand area range and sample more individuals with RA.     

Impact of hand forces and start/stop frequency on physiological responses to three forms of pushing and pulling: a South African perspective

There has been limited attention given to the physiological demands of pushing and pulling, especially in industrially developing countries such as South Africa. Two key factors affecting the physiological demands of these tasks are the hand forces exerted and the start/stop frequency. The purpose of the current study was therefore to investigate the physiological responses to pushing and pulling at various loads and start/stop frequencies. 36 male subjects participated in the study and were required to complete a total of 18 conditions (three techniques: pushing, two- and one-handed pulling; three loads: 200, 350 and 500 kg; and two frequencies: 2 and 4 stops per minute). During each condition the heart rate, oxygen uptake and energy expenditure were measured. Pushing was found to elicit significantly lower responses for all three dependent variables than either form of pulling. The start/stop frequency was also found to have a significant impact on subject responses. The findings of this study indicate that the technique adopted to maneuver loads is critical in determining the physical demands placed on the human operator. Furthermore increasing the frequency of start/stops plays an important role, thus the forces exerted during these two phases are important from a physiological perspective.     

Development of a lateral mobility task to identify individuals at risk for mobility disability and functional decline

Lateral mobility is integral to many activities of daily living involving transfer from one position to another. The objective of this study was to develop and evaluate the validity and test-retest reliability of a lateral-mobility (LATMOB) task for older adults. Measurements of lateral mobility, balance, and strength and self-reported and performance-based physical functioning were obtained in 63 women and 77 men > or = 50 years of age. The LATMOB task was significantly correlated with age, knee-extensor strength, grip strength, functional reach, and one-leg-stance time. Test-retest reliability of the task was excellent. The LATMOB task was highly correlated with the car task. Balance was significantly correlated with time to get into and out of a car and performance on the LATMOB task. The LATMOB task was significantly correlated with the Short Physical Performance Battery score. The LATMOB task is valid and reliable, but additional work is needed to assess its sensitivity to change and predictive validity.     

Married female labor force participation and suicide in Canada, 1971 and 1981

The cultural context affects the relationship between women's involvement in the labor force and the odds of suicide for both men and women. In this study, we examine this relationship in Canada in 1971 and then again in 1981, when cultural conditions were significantly different. Two hypotheses are evaluated: (1) in 1971 the effects of married female labor force participation increase suicide risk for both men and women, due to the relative antipathy of society toward women's participation in the labor force; and (2) in 1981 the effects of married female labor force participation decrease the risk of suicide for both sexes, for there are net positive gains (psychic and material) in a context of widespread acceptance of women's involvement in the paid economy. The empirical analysis provides support for these two hypotheses.     

GENDER-COHORT SUCCESSION AND RETIREMENT AMONG OLDER MEN AND WOMEN, 1951 TO 1984

Long-term trends in occupational change and retirement policy have influenced the relative labor force participation and retirement patterns of subgroups of the older population. Structural changes in the economy have had a large impact on older men and women, pushing the former out of the labor force while pulling the latter in. Meanwhile, the expansion of pension programs for the aged has generally increased the early retirement of men under age 65. Time-series analyses of these trends between 1951 and 1984 point to the specific influences of these factors on gender-cohorts.     

Women’s Tertiary Education Masks the Gender Wage Gap in Turkey

This paper investigates the gender wage gap for full-time formal sector employees, disaggregated by education level. The gap between the labor force participation rate of women with tertiary education and those with lower levels of education is substantial. There is no such gap for men. Hence, existing gender wage gap studies for Turkey, where we observe lopsided labor force participation rates by education levels, compare two very different populations. We disaggregate the whole sample by education level to create more homogenous sub-groups. For Turkey, without disaggregation, the gender wage gap was 13% in 2011, and women are significantly over-qualified relative to men on observed characteristics. Once we disaggregate the sample by education level, we show that the gender wage gap is 24% for less educated women and 9% for women with tertiary education in full-time formal employment. Observed characteristics only explain 1 % of this gap in absolute terms. We further disaggregate the data by public and private employment. The gender gap is higher in the private sector. However, women with tertiary education in the public sector are significantly better qualified compared to men, and consequently the adjusted gender wage gap is higher for women with tertiary education in the public sector. Our estimates also indicate a rise in the gender wage gap between 2004 and 2011.     

Before Crisis: Gender and Economic Outcomes of the Two Largest Immigrant Communities in Spain1

In this study, we compare labor force outcomes of the two largest immigrant communities in Spain (Moroccans and Romanians) before the economic crisis hit. We are interested in understanding if and how gender influences the labor force outcomes (wage per hour, labor force participation, and unemployment rate) of these two immigrant groups. Our analyses show that, overall, gender is an important variable on Spanish labor market, but it affects differently the two groups. There is a male job market and a female job market for both Romanian and Moroccan immigrants, with men earning significantly higher wages than women. However, while for Moroccans, working women differ significantly from men in terms of demographic characteristics, Romanian women and men have similar demographic characteristics and comparable levels of labor force participation, but differ in terms of wage levels.     

Gender differences in the occupational status of undocumented immigrants in the United States: experience before and after legalization

"This article examines the incorporation of a national sample of undocumented immigrants both before and after they applied to legalize their status under the provisions of the [U.S.] Immigration Reform and Control Act of 1986 (IRCA). Data from the 1989 and 1992 Legalized Population Surveys (LPS-1 and LPS-2) are used. These surveys provide labor force and occupational data for three critical reference periods: as newly arrived undocumented immigrants, as experienced undocumented immigrants, and as documented immigrants.... The overall upward mobility of both men and women between first job and the occupation held at time of application for legalization continued after legalization. On average, men also continued to report higher status jobs than women, although women did somewhat better after their status was legalized." This is a revised version of a paper originally presented at the 1997 Annual Meeting of the Population Association of America.     

The Development of Anticipatory Postural Adjustments in Infancy

Efficient voluntary action requires postural adjustments that compensate for potential balance disturbances before they occur. These anticipatory postural adjustments have been widely investigated in adults, but relatively little is known about their development, especially during infancy. This study examined the early development of anticipatory postural activity in support of pulling action while standing. A total of 34 infants between 10 and 17 months were tested. The task required infants to open a cabinet drawer to retrieve toys while a force resisting the pulling action was applied to the drawer. The experiment included between 9 and 13 pulling trials. The force resisting the pull was doubled after the first 4 initial trials and returned again to its original value after another 4 trials. Electromyographic activity from the gastrocnemius and biceps brachii muscles was recorded. The proportion of pulls involving anticipatory activity in the gastrocnemius muscles progressively increased between 10 and 17 months. In addition, infants with considerable experience in opening drawers learned to recruit greater strength of their anticipatory postural adjustments for heavier pulls. Implications for the role of motoric experience in anticipatory postural activity are discussed.     

Replication: Do women shy away from competition? Experimental evidence from China

We investigate gender differences in competitiveness using a lab-in-the-field experiment and a subject pool consisting of Chinese adults following the design by Niederle and Vesterlund (2007). China provides an interesting environment to study since the country has promoted gender equality for a long time and the gender gap in earnings is small in cross-country comparisons. However, in many respects, China is still a patriarchal society. Our results show that women perform equally well as men in a piece-rate task and significantly better in a competitive payment environment. Despite this, men are more than twice as likely to choose a competitive environment. This gender difference cannot be explained by differences in confidence or risk preferences.     

Maximum force levels in different positions of shoulder and elbow

The number of occupational diseases in Mexico is alarming and clearly it is important to do studies with the purpose of improving the design of workstations. The objective of this research is to determine the maximum force levels in different positions of shoulder and elbow. An experiment was conducted with 16 subjects between 18 and 28 years old: 8 male and 8 female. We considered 16 different positions, working with the right and left arm to perform the tasks of pull and push. The tasks consisted of pushing or pulling a dynamometer for a period of 3 seconds as hard as possible. The results were presented in tables. The tables show the mean, standard deviation and range of force levels in different positions.     

Sexual Orientation Moderates the Effect of Gender on Body Satisfaction: Results From a National Probability Sample

Body image concerns typically affect women more so than men, but there is reason to believe that this pattern may depend on sexual orientation. The present study examined differences in levels of body satisfaction among men and women who identified as heterosexual, plurisexual (bisexual and pansexual), gay, and lesbian, using data from a large-scale national probability sample from New Zealand (N = 17,005). As expected, heterosexual men reported higher body satisfaction than heterosexual women. Gay and plurisexual men reported lower body satisfaction than heterosexual men. Gay men also reported lower body satisfaction than lesbian women, and did not differ significantly from heterosexual and plurisexual women. Ratings of heterosexual, plurisexual, and lesbian women’s body satisfaction did not differ significantly. Results held when adjusting for a range of demographic covariates (including age and BMI), and highlight the importance of examining the psychological and health outcomes associated with poor body image among gay men. These findings emphasize the relevance of sexual orientation in understanding men’s body image-related issues.     

Gay, Straight, or Somewhere in Between: Accuracy and Bias in the Perception of Bisexual Faces

Sexual orientation can be accurately identified from photos of faces, but previous work has focused exclusively on straight versus gay and lesbian individuals. Across three studies, the current work investigated the facial perception of bisexual men and women, a less socially salient category. Although participants could identify straight and gay men at above-chance levels in a trichotomous categorization task, bisexual men were categorized only at chance (Study 1). Participants perceived bisexual men to be significantly different from straight men, but not gay men (Study 2). Similarly, whereas bisexual and lesbian women were not rated differently, both groups were distinguishable from straight female targets (Study 3). These findings suggest a straight-non straight dichotomy in the categorization of sexual orientation.     

Labor force participation and fertility: a study of married women in Bangladesh

Most researchers support the notion that a direct negative relationship exists between married women's labor force participation and fertility behavior, yet female employment shows no consistent, general relationship with declining fertility at individual and societal levels. Specific conditions under which employment lowers fertility are therefore explored for the case of Bangladesh. The economic, sociological, and world-system theoretical approaches to the relationship and empirical studies in developing countries including Bangladesh are reviewed. 1975-76 Bangladesh Fertility Survey data on births, deaths, nuptiality, and family planning knowledge and practice for 5772 currently married women of 6513 ever married women under 50 sampled are subjected to multivariate analysis for the study. Analysis revealed that women's modern and traditional occupation as well as higher and secondary education significantly lower their fertility, and that higher age, Islamic religion, use of modern contraceptives, and husband's occupation in transitional and modern sectors have significant positive effects on fertility. The correlation between higher fertility and contraceptive use may be due to women's delay in practicing family planning until reaching desired parity and/or high infant mortality driving women to cease practice in order to replace lost offspring. Future research should be conducted with larger samples and also consider occupations of both husbands and wives. Societal attitudes about women's education should be reformed in support of opening rural schools for women. With 90% of women residing in rural areas and women with traditional occupations having lower fertility, more traditional sector opportunities for women in cottage industry and agriculture production are also recommended, and would help balance skewed urban growth and hypertrophication of the tertiary sector. Finally, motivational efforts should be focused upon encouraging younger instead of older married couples to limit fertility.     

A Research Note on Family and Income Distribution: The Equalizing Impact of Married Women's Earnings in Metropolitan Brazil*

Using the 1985 Brazilian Annual Household Survey (PNAD), this study analyzes the extent to which the labor force participation of married women influenced familyincome inequality. The marginal impact on family earnings is decomposed into two components, one generated uniquely by differences in earnings inequality between spouses and another produced by imperfect assortive mating on spouses' earnings. Results show that the correlation among spouses' earnings is significantly less than one (0.4), and that the level of earnings inequality is more than 50 percent higher among wives than husbands. Because these forces are offsetting, wives' labor income has a negligible impact on family-income inequality in Brazil. The results demonstrate the importance of isolating the influence of imperfect assortive mating from that due to inequality in earnings between men and women.     

Sexual Behavior in Parked Cars Reported by Midwestern College Men and Women

In an anonymous survey of 195 men and 511 women (M_age = 19.8) at a small Midwestern university, 119 men (61%) and 303 women (59.5%) reported that they had engaged in sex while parked. Of these 422, 14% lost their virginity in a parked car. Having sex in parked cars was more likely to involve relational dating partners than hookups. In most recent incidents, the majority of respondents were with a serious but noncohabiting romantic partner (56.9%) in the back seat (63.4%) of a standard car (56.4%) parked out in the country (56.0%). The most common sexual acts were penile-vaginal sex and genital touching, reported by 84.6% and 57.5% of respondents, respectively. Condoms were used by 58.2% of respondents. Less than 1% of respondents reported sexually transmitted infections (STIs) or pregnancy outcomes. These data, including personal stories of memorable incidents, revealed that despite discomfort, body bumps, and risk of being caught, sex while parked was primarily a positive sexual and romantic experience for both men and women. A dark side of parked-car sex existed in that 2.5% of men and 4.3% of women reported being sexually coerced. The future study of sex in parked cars in urban environments is recommended.     

Female labour force participation and fertility

The levels of labor force participation by women in selected Asian countries were recorded in a series of censuses taken over a period of years. These levels were less influenced than male employment levels by economic conditions and more influenced by cultural traits of the country. Postwar trends seem to have fallen in Korea, risen in Singapore and the Philippines, and remained steady in Japan, Malaya, and Thailand. The limitations of these data are mentioned. In Thailand and West Malaysia greater percentages of women worked in agricultural than non-agricultural employment; in the Philippines, where women did not work so much in agricultural pursuits, their jobs were still in traditional rather than in development industries. In the cities of Bangkok, Manila, and Kuala Lumpur, fertility was lower for working than for non-working women. In rural agricultural areas, the fertility of working women was minimally higher, probably due to economic need of lar ger families. It is concluded that urban life separates the employment and the family roles of working women, leading to lowered fertility; this does not occur in rural areas. The creation of new roles for women alternative or supplementary to marriage and motherhood would result in lowered fertility. In high fertility Asian countries, policies directed toward greater participation of women in non-agricultural work and great er exposure to an urban lifestyle might achieve fertility reductions.     

Perceived Sexual Orientation and Helping Behavior by Males and Females

Recent studies indicate that men are more homophobic than women and that a negative bias among men is particularly evident toward homosexual men (Augero, Bloch, & Byrne, 1984; D'Augelli & Rose, 1990). Self-report measures have frequently been used to indicate homophobia and are susceptible to distortion by respondents. Therefore, the present study used the "wrong number technique" (Gaertner & Bickman, 1971) to obtain a nonreactive measure of homophobia Forty male and forty female subjects received an apparently wrong number telephone call from a male caller who portrayed himself as either a heterosexual or a homosexual. Indicating that his car had broken down and that he was out of change at a pay phone, the caller requested help by asking the subject to call his girlfriendboyfriend for him. It was expected that more help would be given to perceived male heterosexuals than to perceived homosexuals, particular     

"I Used to Think Women Were Weak": Orthodox Masculinity, Gender Segregation, and Sport

This article explores the cultural and structural forces that help influence the reproduction of sexist, misogynistic, and antifeminine attitudes among men in team sports. It first shows how the segregation of men into a homosocial environment limits their social contact with women and fosters an oppositional masculinity that influences the reproduction of orthodox views regarding women. However, this research also shows that when these same men compete in the gender-integrated sport of cheerleading, they positively reformulate their attitudes toward women. These findings therefore suggest that gender-integrating sports might potentially decrease some of the socionegative outcomes attributed to male team sport athletes, possibly including violence against women.     

Cut-points to prevent low back injury due to force exertion at work

Force exertion is related to low back injuries (LBI). This paper critically reviews the literature concerning cut-points for back force exertion, presents available guidelines in a concise manner, and identifies areas that need further research. The studies reviewed were grouped according to the criteria used to set the cut-point values. Most often cut-points differ than concur. The approach considering physiological, psychophysical, epidemiological, and biomechanical aspects of back force exertion meets the most known criteria and presents the lowest common denominator of instantaneous load for lifting tasks. Further experimental and epidemiological studies in peak load and cumulative exposure are necessary. Compound indices should also be developed for pushing, pulling, and carrying. Future indices should consider electromyographically determined fatigue, differential viscoelastic properties of tissues, aging, and the cross sectional area of back muscles. We hope that this paper contributes to a more systematic appraisal of back force exertion at work.