烈运动后剧睾丸激素水平会下降
After a long bout of exercise, testosterone levels drop in male athletes, but injecting another hormone beforehand can block this decline, researchers from Italy report.
According to an expert not affiliated with the study, however, this type of treatment may be unnecessary, since it is not known whether or not this drop in testosterone level is harmful.
In the study, Dr. Vincenzo De Leo and colleagues at the University of Siena, Italy, measured testosterone levels in the blood of 18 male marathon runners before and after they ran for 90 minutes. During the run, testosterone levels rose, but the levels declined to below normal after the men stopped running, according to the report in the April issue of the journal Fertility & Sterility.
The next day, nine runners received an injection of a hormone called human chorionic gonadotropin (hCG) while the others received a placebo injection that only contained a saline solution. Two days later, all athletes repeated the running session.
Again, testosterone increased in both groups during exercise, according to the report. But the men in the hCG group did not experience a decline in testosterone after exercise, as did those in the placebo group.
In an interview with Reuters Health, Dr. Joel Marmar, the president-elect of the Society for Male Reproduction and Urology, said the findings are interesting, but it is difficult to know what to make of them for the average athlete. According to Marmar, who is a professor of urology at the Robert Wood Johnson Medical School in Camden, New Jersey, even though the decline in testosterone was statistically significant, the levels were not particularly alarming.
``It‘s not as though these values are horribly low,‘‘ he said. It‘s true that low testosterone can reduce sperm count, but Marmar said that the long-term effects of the drop in testosterone levels after strenuous exercise, which may be temporary, are unknown., 百拇医药
According to an expert not affiliated with the study, however, this type of treatment may be unnecessary, since it is not known whether or not this drop in testosterone level is harmful.
In the study, Dr. Vincenzo De Leo and colleagues at the University of Siena, Italy, measured testosterone levels in the blood of 18 male marathon runners before and after they ran for 90 minutes. During the run, testosterone levels rose, but the levels declined to below normal after the men stopped running, according to the report in the April issue of the journal Fertility & Sterility.
The next day, nine runners received an injection of a hormone called human chorionic gonadotropin (hCG) while the others received a placebo injection that only contained a saline solution. Two days later, all athletes repeated the running session.
Again, testosterone increased in both groups during exercise, according to the report. But the men in the hCG group did not experience a decline in testosterone after exercise, as did those in the placebo group.
In an interview with Reuters Health, Dr. Joel Marmar, the president-elect of the Society for Male Reproduction and Urology, said the findings are interesting, but it is difficult to know what to make of them for the average athlete. According to Marmar, who is a professor of urology at the Robert Wood Johnson Medical School in Camden, New Jersey, even though the decline in testosterone was statistically significant, the levels were not particularly alarming.
``It‘s not as though these values are horribly low,‘‘ he said. It‘s true that low testosterone can reduce sperm count, but Marmar said that the long-term effects of the drop in testosterone levels after strenuous exercise, which may be temporary, are unknown., 百拇医药