Narcissism is a personality structure which has signs such as the penetration of personal desires, accountability from others and prejudice in cognitive processing. In most cases, narcissistic leaders are seeking big achievement in the company. They are shifted in the d More
Narcissism is a personality structure which has signs such as the penetration of personal desires, accountability from others and prejudice in cognitive processing. In most cases, narcissistic leaders are seeking big achievement in the company. They are shifted in the direction of implementing bold, operational strategies, and risky business decisions which leading to huge profit or loss at the end of the fiscal year. In this regard, this study examines the effects of narcissism of managers on stock price crash risk of 52 companies listed on the Tehran Stock Exchange during 2010 to 2014. Testosterone hormone and cash bonuses were two indicators which were used to measure narcissism of managers. Stock price crash risk were measured by both down-up volatility index and falling period of stock price were used. The results of the study showed that the testosterone hormone index and executives cash bonuses has a positive effect on down-up volatility index but they have negative effect on falling period of stock price.
Manuscript profile
The purpose of this study is to determine the effectiveness of testosterone on the decisions and attitudes of investors. The research method is experimental with pre-test-post-test design with control group. The statistical population includes all accounting students of More
The purpose of this study is to determine the effectiveness of testosterone on the decisions and attitudes of investors. The research method is experimental with pre-test-post-test design with control group. The statistical population includes all accounting students of the Islamic Azad University of Tehran who have worked in the stock market for one year. Then, available at Azad University of Tehran, Markaz and Damavand Branches were selected as a sample and after screening, 80 people were selected as a sample and randomly assigned to two groups of 40 (experimental and control). Testosterone was injected for the experimental group and placebo for the control group. The instrument used by the researcher was the validity of a formal and content questionnaire and Cronbach's alpha test was used for reliability. Finally, the data were analyzed by covariance test. The results showed the effect of testosterone on investor decisions and attitudes.
Manuscript profile
Testosterone is one of the most important masculine hormones, playing a major role in shaping men’s face and their behavioral characteristics including risk taking. Measuring the testosterone level of the CEOs, recent studies have revealed a significant relationsh More
Testosterone is one of the most important masculine hormones, playing a major role in shaping men’s face and their behavioral characteristics including risk taking. Measuring the testosterone level of the CEOs, recent studies have revealed a significant relationship between biological characteristics of the CEOs and corporate economic decisions. Therefore, the present study aims to investigate the impact of the facial width to height ratio (fWHR) of the CEO as one of the factors determining the testosterone level on risk-taking companies. To do so, a sample of 49 firms listed in Tehran Stock Exchange during the years 2014-2016 were selected and then tested using multivariate regression model based on panel data technique. The findings indicate that the high testosterone level in CEOs tends to result in corporate risk taking. The findings of current study not only fill existing gaps in the field, but also contribute to decision-making practices in Stock Exchange.
Manuscript profile
The aim of the present study was to investigate the effects of a single bout of cycling exercise with and without blood flow restriction on serum concentrations of testosterone, cortisol and tumor necrosis factor-alpha in healthy men. For this purpose, 16 members of R8 More
The aim of the present study was to investigate the effects of a single bout of cycling exercise with and without blood flow restriction on serum concentrations of testosterone, cortisol and tumor necrosis factor-alpha in healthy men. For this purpose, 16 members of R8 Niavaran Gym were selected. Subjects were divided into two groups according to their power: cycling with foot arteries blockage and cycling without foot arteries blockage. The training session consisted of 3×3-minutes cycling with 50% Wmax intensity, with a rest interval of 30-45 seconds. The group without arteries blockage performed the same protocol, except that there were no blood flow restrictions. Blood samples were taken 24 hours before the start of the training period and 24 hours after the last training session. Data were analyzed using independent t-test and dependent t-test at the significant level of P <0.05. The obtained results showed that within-group changes in testosterone and TNF-α in the arteries blockage group and without arteries blockage group showed no significant changes (P≥0.05). Also, between-group changes showed no difference between the two groups (P≥0.05). the within-group changes of cortisol significantly increased in the arteries blockage group (P≤0.05) and did not show a significant change in the group without arteries blockage (P≥0.05). Between-group changes showed a difference between the two groups (P≤0.05). The present study showed that blood flow restriction activity had no significant effect on serum testosterone and TNF-α levels in healthy men in relation to the same activity without blood flow restriction, but this difference was significant in cortisol level. As a result, people who are reluctant to do intense and long-term exercise can increase testosterone and reduce inflammatory factors using a less intense restricted blood flow exercise.
Manuscript profile
Sanad
Sanad is a platform for managing Azad University publications
