Physiological Correlates of Volunteering

We review research on physiological correlates of volunteering, a neglected but promising research field. Some of these correlates seem to be causal factors influencing volunteering. Volunteers tend to have better physical health, both self-reported and expert-assessed, better mental health, and perform better on cognitive tasks. Research thus far has rarely examined neurological, neurochemical, hormonal, and genetic correlates of volunteering to any significant extent, especially controlling for other factors as potential confounds. Evolutionary theory and behavioral genetic research suggest the importance of such physiological factors in humans. Basically, many aspects of social relationships and social activities have effects on health (e.g., Newman and Roberts 2013; Uchino 2004), as the widely used biopsychosocial (BPS) model suggests (Institute of Medicine 2001). Studies of formal volunteering (FV), charitable giving, and altruistic behavior suggest that physiological characteristics are related to volunteering, including specific genes (such as oxytocin receptor [OXTR] genes, Arginine vasopressin receptor [AVPR] genes, dopamine D4 receptor [DRD4] genes, and 5-HTTLPR). We recommend that future research on physiological factors be extended to non-Western populations, focusing specifically on volunteering, and differentiating between different forms and types of volunteering and civic participation

Selenium and Prostate Cancer : Analysis of Individual Participant Data From Fifteen Prospective Studies

Background: Some observational studies suggest that a higher selenium status is associated with a lower risk of prostate cancer but have been generally too small to provide precise estimates of associations, particularly by disease stage and grade. Methods: Collaborating investigators from 15 prospective studies provided individual-participant records (from predominantly men of white European ancestry) on blood or toenail selenium concentrations and prostate cancer risk. Odds ratios of prostate cancer by selenium concentration were estimated using multivariable-adjusted conditional logistic regression. All statistical tests were two-sided. Results: Blood selenium was not associated with the risk of total prostate cancer (multivariable-adjusted odds ratio [OR] per 80 percentile increase = 1.01, 95% confidence interval [CI] = 0.83 to 1.23, based on 4527 case patients and 6021 control subjects). However, there was heterogeneity by disease aggressiveness (ie, advanced stage and/or prostate cancer death, P-heterogeneity = .01), with high blood selenium associated with a lower risk of aggressive disease (OR = 0.43, 95% CI = 0.21 to 0.87) but not with nonaggressive disease. Nail selenium was inversely associated with total prostate cancer (OR = 0.29, 95% CI = 0.22 to 0.40, P-trend <.001, based on 1970 case patients and 2086 control subjects), including both nonaggressive (OR = 0.33, 95% CI = 0.22 to 0.50) and aggressive disease (OR = 0.18, 95% CI = 0.11 to 0.31, P-heterogeneity =.08). Conclusions: Nail, but not blood, selenium concentration is inversely associated with risk of total prostate cancer, possibly because nails are a more reliable marker of long-term selenium exposure. Both blood and nail selenium concentrations are associated with a reduced risk of aggressive disease, which warrants further investigation

From brain drain and brain gain to brain circulation: conceptualizing re-expatriation intentions of Vietnamese returnees

Much of the extant literature in the field of brain circulation has tended to focus on talented individuals leaving their home countries (brain drain) or talented graduate/professionals returning to their home countries (reverse brain drain). As part of its economic strategy to transform its economy, Vietnam has adopted measures aimed at tackling skill shortages and reversing the so-called “brain drain” by attracting back overseas Vietnamese graduates/professionals. This reversal, however, may be temporary as Vietnamese returnees may go abroad again (in other words, re-expatriate), if for example, they are unhappy and do not adjust well to their home country. This paper reviews research on the reasons behind why Vietnamese returnees who have studied and/or worked abroad in advanced/developed economies, and have returned to Vietnam, may decide to re-expatriate on their own initiative. We find that intentions to re-expatriate are affected by different pull and push factors associated with the home and host countries. Vietnamese returnees are pulled abroad by host country attraction (e.g. higher salaries and better job opportunities), and pushed away from their home country by home country dissatisfaction (e.g. dissatisfaction with the working environment in Vietnam). Further, negative re-entry experiences (e.g. reverse culture shock and poor cross-cultural readjustment) may prompt Vietnamese returnees to consider re-expatriating. This chapter adds to the limited number of studies on brain circulation and re-expatriation of returnees in emerging economies. It contributes to theory by developing a conceptual framework of factors affecting the re-expatriation intentions of returnees in the context of an emerging economy, notably Vietnam. It also offers a number of implications for the Vietnamese government and managers with respect to retaining Vietnamese returnees