Jing huang finance12/11/2023 ![]() ![]() Occupational exposure to heat was also negatively associated with semen quality. 21 A previous study 22 indicated a negative relationship between pesticide exposure or radiation and reduction of sperm motility and concentration. 20 Some data suggested that high exposure level of formaldehyde among autopsy service workers had an adverse effect on abnormal sperm progressive motility ( OR=4.84 95% CI 1.83 to 12.81) and abnormal total sperm motility ( OR=4.84 95% CI 1.83 to 12.81). Physical or chemical hazards in the workplace may be the main cause of male infertility. A previous study 19 reported that occupational exposure to polycyclic aromatic hydrocarbons was associated with decreased sperm DNA integrity among coke oven workers. Occupational hazards are potential risk factors that might influence semen quality. 18 Hence, researchers are not sure whether these findings of risk factors or preventive measures can be applied worldwide and to the local population. 17 However, a meta-analysis showed that elite physical activity hurts semen quality. Most studies suggested that physical activity was an important risk factor for sperm count and concentration in white young men. 16 Even for some well-recognised factors, there are still some controversies about their impacts on semen quality. 13 However, the factors for poor semen quality vary between different populations and regions 14 for example, cigarette smoking has an overall detrimental effect on semen quality, 15 while another study found that smoking was not associated with sperm motility. Some data suggest that the risk factors for poor semen quality include excessive alcohol consumption, cigarette smoking, the wearing of tight-fitting underwear, being fat and the use of recreational drugs. The current knowledge about the factors associated with semen quality is often contradictory. 12 However, the reasons for the decline of semen quality over the past decades are still not resolved worldwide. The results of the Global Burden of Disease Survey showed that the age-standardised prevalence of infertility increased by 0.291% each year in men and by 0.37% in women. 11 A systematic review 12 reported that semen counts decreased by 50%–60% between 19, meanwhile, male infertility has increased in these years. 10 However, semen quality has declined in several developed and developing countries in the past years. Previous studies have focused on the semen quality among semen donors, 7 young men, 8 male partners in infertile couples 9 and fertile men. A previous report 6 suggested that semen quality could serve as a useful predictor of male fertility. 5 Semen quality is the cornerstone of male infertility studies. 2 Many causes could result in male infertility, including male diseases, 3 genetics, lifestyle factors 4 or environmental exposure due to living in highly polluted areas. 1 An international study estimated that 72.4 million people of reproductive age were infertile. Male infertility affected approximately 7% of the male population worldwide. ![]()
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |