Atrial fibrillation (AF) is considered as the most common sustained arrhythmia in adults, whose incidence rate is on the rise due to the increase in the mean age of the global population. In recent years, many efforts have been made to identify effective factors in the incidence of AF to prevent them and thereby reduce the consequences of AF. Physical activity is one of the topics that attracted much attention in the last two decades. According to some findings, extreme and prolonged exercise itself can be considered as a risk factor for the onset of AF; however, other studies have shown that exercise can be regarded a protective factor against AF in the general population. The present study reviews the findings of studies on the relationship between AF and exercise and discusses possible mechanisms for this relationship. Additionally, we present some recommendations for researchers and physicians about exercise management in association with AF prevention.

The present study seeks to explain the impact of accounting good and bad news on stockholder behavior. It is expected that good and bad news issued by financial reports will affect the behavior of shareholders as a result of the information burden. The behavior of the resulting effects can be seen in fluctuations in the volume of stock exchanges of the reporter's firms. In this study, contrary to similar researches, rather than distributing a questionnaire, the behavior of shareholders was evaluated by monitoring the volume of transactions. The sample of this study is the active units of Tehran Stock Exchange. The data was extracted from the databases of Rahavard-enovin, the site of the stock exchange organization and the Codall system. Based on screening, 124 active reporter firms were selected from 649 reporter firms which were operating under the supervision of the organization from 2011 to 2016. Based on the results, accounting's good and bad news affects the behavior of shareholders and investors. This is while stockholders and investors have behavioral superstitions and do not follow the logical pattern.

Malakout is a postmodern novel, and what is important in the analysis of a postmodern novel is related mostly to the description of certain literary techniques, which are used to emphasize the futility of the old meanings. These works have characteristics that without paying attention to them, one cannot expect a logical evaluation of the work. Some of these postmodern features and techniques which are very important in this novel and will be discussed here are as follows: meta-fiction, intertextuality, fragmentation, black humor, pastiche, temporal distortion, minimalism, and finally grotesque. Extended Abstract Bahram Sadeghi first published his short novel Malkout in a journal in 1340/ 1961 (Sadeghi, 1961). He made some additions and corrections in it shortly after that publication, but he himself did not take any action to republish the work. About 10 years later, Abolhasan Najafi, Sadeghi’s friend and master, edited this novel and some other short stories by Sadeghi and published them all in the form of a collection of Bahram Sadeghi's works. Since then, this novel and other short stories have been published several times by various publishers. The first chapter of the novel Malkout by Bahram Sadeghi has an epigraph that is in fact a verse from the Qur'an:فَبَشِّر هُم بِعذاب الیم  [Give them good news of a painful torment] (Q 84: 24). “فَبَشِّر” in Arabic means “give good news”, but in this verse, the word "good news" is used to express painful and tormenting news! Here we are dealing with a so called sarcastic metaphor, and the novel Malkout by Bahram Saldaghi (1340/ 1962) can be considered altogether as an extended form of this sarcastic metaphor (see also Aslani, 2019; 2021). The fact is that Malakout is a postmodern novel, and neglecting this fact has caused many critics of the novel to pay more attention to its epistemological details rather than to its ontological nature. What is important in the analysis of a postmodern novel, rather than revealing its meanings, is related to the description of certain literary techniques, which are used to emphasize the futility of the old meanings. Malakout, like detective novels, has many secrets and there are many clues with the help of which one can unravel some of its mysteries and riddles (Shiri, 2005; Sᾱ’edi, 1992). If the mysteries and riddles in detective novels are finally solved completely, the solution of many mysteries of Malakout, like many other postmodern novels, are due to the readers themselves. Each reader must solve the mysteries and riddles in his or her own way and gives his or her own meaning to the novel (Ebrahimi Fakhari, 2019). Apart from the importance of the reader's role in the interpretation of the novel, these works have other characteristics that without paying attention to them, one cannot expect a logical evaluation of the work. Some of these postmodern features and techniques which are very important in this novel and will be discussed here are as follows: meta-fiction (Waugh, 1984), intertextuality, fragmentation, black humor, pastiche, temporal distortion, minimalism, and finally grotesque (Lehmann 2005; Barry, 2002; Imhof 1986; Imhof 1986). Malkout can be seen as a satirical imitation of texts such as the Old Testament and the New Testament, and Ykolia and her Loneliness (Modarresi, 1334/ 1955). One of the most important features of postmodern novels is satire and ridicule of moral beliefs and social and cultural institutions ruling the society (Safi Pirludje, 2015; Hutcheon, 1988; Genette, 1980); Sadeghi by using techniques such as meta-fiction, black humor, pastiche and grotesque, mocked the images of mythological characters such as Jehovah, Satan, Ab (Father or Christian God) and Christ. He mocked the authority of the strongest cultural institutions of his time, which ironically and day by day were to take a greater importance and power so that they finally took the upper hand in Iran. This novel is the first successful post-modern novel in the Persian language, and apart from its aesthetic values and literary importance, it shows the great power of the Persian language in expressing new mentalities and creating new spaces that have not had the slightest history in this language. The modern Persian novel started with the Blind Owl of Sadegh Hedayat, and Persian novel with Malkout Bahram Sadeghi stepped into another completely new stage called postmodern (see also Ghasri 2022; Nadjafi 2020; Honarmand 2011). References Aslani, M. R., 2019, Bᾱzmᾱnde-hᾱ-ye Qaribi Āshenᾱ…, Tehran, Niloufar Publisher. Aslani, M. R., 2021, “Jᾱvedᾱnegi”, Bahram Sadeghi; Tᾱrikh-e shafᾱhi-ye Dᾱastᾱn-Nevisᾱn-e Iran, edited by Hamed Ghasri, Tehran, Kettab-e Sarzamin. Ebrahimi Fakhari, M. M., and Sharifnasab, M., 2019, “Barresi-ye Sdze-ye Modern dar Bouf-e Kour-e Sadegh-e Hedayat”, Naqd Va Nazari-je-je Adabi, vol. 4, Winter, No.2. Genette, G., 1980, Narrative Discourse: An Essay in Method, translated by J. E. Lewin Ithaca, New York, Cornell University Press. Ghasri, H., 2022, Bahrᾱm Sᾱdeghi; Tᾱrikh-e Shafᾱhi-e Dᾱstᾱn-Nevisi Iran, Tehran, Ketᾱb-e Sarzamin. Honarmand, Saeed, 2011, “MALAKUT”, in: Encyclopædia Iranica, online edition, 2011, available at http://www.iranicaonline.org/articles/malakut (accessed on 16 October 2017). Hutcheon, Linda, 1988, A Poetics of Postmodernism, London, Routledge. pp. 202-203. Imhof, Rüdiger, 1986, Contemporary Metafiction – A Poetological Study of Metafiction in English since 1939, Heidelberg: Carl Winter Universitätsverlag. Lehmann, H. T., 2005, Post-dramatic Theatre, Rutledge. Lewis, Barry, 2002, “Postmodernism and Literature”, in: The Routledge Companion to Postmodernism, edited by Stuart Sim, Routledge, pp. 121-134. Modarresi, T., 1971, Yakoliyᾱ va Tanhᾱ’i-ye ’u, Tehran, Nil Publisher. Nadjafi, A. H., 2020, Goft-o-go bᾱ Abol-Hasan Nadjafi, ed. By Omid Tabibzadeh, Tehran, Niloufar Publisher. Sadeghi, B., 1961, “Malakout”, Ketᾱb-e Hafte, No. 12, 7-100. Sadeghi, B., 2000, Malakout, Tehran, Ketᾱb-e Zamᾱn. Safi Pirludje, H., 2015, Ravᾱyat Padzuhi dar Zamᾱn; Sanjesh-e Ravesh-hᾱ-je Ghesse-Gu’I va Dᾱstᾱn-nevisi dar Fᾱrsi, Tehran, Padzuheshgᾱh-e Olum-e Ensᾱni va Motᾱle’ᾱt-e Farhangi. Shiri, Gh., 2005, “Pasᾱmodernism va Maktab-e Dᾱstᾱn-nevisi-ye Esfahᾱn”, Majale-ye Daneshkade-ye Adabijᾱt-e Dᾱneshgᾱh-e Esfehᾱn, Vol. 2, 43, Winter, 167-198. Sᾱ’edi, Gh., 1992, “Honar-e Dᾱstᾱn-Nevisi-ye Bahram Sadeghi”, Kelk, No. 32 and 33. Waugh, Patricia, 1984, Metafiction – The Theory and Practice of Self-Conscious Fiction, London, New York: Routledge.

The purpose of this study is to investigate the effects of conditional conservatism imposed by the companies on further negative news. The methodology of the study is quasi experimental; to test the first hypothesis a logit regression method and to test the second hypothesis, an ordinary least squares method are used. The statistical society includes companies accepted in Tehran Stock Exchange, and the time span of the study is from the beginning of 2003 up to the end of 2010. To measure the conditional conservatism imposed by the companies a non-operating accruals model of Givoly and Hine (2000) is used.The results indicate that there is a negative and significant relationship between conditional conservative and the likelihood of further negative news. The results also indicate lack of significant linear relationship between conditional conservatism and market reaction to good and bad news of the companies. Furthermore, a significant relationship between the size of company and its degree of financial leverage, with unusual efficiency of the company was approved.