A prospective study of risk factors for erectile dysfunction
ABSTRACT We examined the impact of obesity, physical activity, alcohol use and smoking on the development of erectile dysfunction.
Subjects included 22,086 United States men 40 to 75 years old in the Health Professionals Followup Study cohort who were asked to rate their erectile function for multiple periods on a questionnaire mailed in 2000. Men who reported good or very good erectile function and no major chronic disease before 1986 were included in the analyses.
Of men who were healthy and had good or very good erectile function before 1986, 17.7% reported incident erectile dysfunction during the 14-year followup. Obesity (multivariate relative risk 1.9, 95% CI 1.6-2.2 compared to men of ideal weight in 1986) and smoking (RR 1.5, 95% CI 1.3-1.7) in 1986 were associated with an increased risk of erectile dysfunction, while physical activity (RR 0.7, 95% CI 0.7-0.8 comparing highest to lowest quintile of physical activity) was associated with a decreased risk of erectile dysfunction. For men in whom prostate cancer developed during followup, smoking (RR 1.4, 95% CI 1.0-1.9) was the only lifestyle factor associated with erectile dysfunction.
Reducing the risk of erectile dysfunction may be a useful and to this point unexploited motivation for men to engage in health promoting behaviors. We found that obesity and smoking were positively associated, and physical activity was inversely associated with the risk of erectile dysfunction developing.
02/2015; 9(1-2). DOI:10.5489/cuaj.2731
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ABSTRACT: IntroductionThere is growing interest in using exercise to treat. Although many studies have highlighted the relationship between better erectile function and exercise, black men have been underrepresented in the literature.AimsThis study aims to determine whether or not exercise is associated with better erectile as well as sexual function in black men and define a minimum exercise threshold for which better erectile/sexual function is seen in a cross-sectional study.Methods Our study population consisted of 295 healthy controls from a case-control study assessing risk factors for prostate cancer conducted at the Durham Veterans Affairs Medical Center, which contained a substantial proportion of black men (n = 93; 32%). Exercise and erectile/sexual function were both determined from self-reported questionnaires. Subjects were stratified into four exercise groups: <3 (sedentary), 3–8.9 (mildly active), 9–17.9 (moderately active), and ≥18 (highly active) metabolic equivalents (MET) hours/week. The association between exercise and erectile/sexual function was addressed utilizing multivariable linear regression analyses.Main Outcome MeasuresErectile/sexual function was defined by the validated Expanded Prostate Cancer Index Composite sexual assessment, which was analyzed as a continuous variable (sexual function score). Clinically significant better function was defined as half a standard deviation (SD) (16.5 points).ResultsMedian sexual function score was 53 (SD = 33). Higher exercise was associated with a better sexual function score (P < 0.001). Importantly, there was no interaction between black race and exercise (P-interaction = 0.772), meaning more exercise was linked with better erectile/sexual function regardless of race. Overall, exercise ≥18 MET hours/week predicted better erectile/sexual function (P < 0.001) with a clinically significant 17.3-point higher function. Exercise at lower levels was not statistically (P > 0.147) or clinically (≤8.14 points higher function) associated with erectile/sexual function.Conclusions In a racially diverse population, exercise ≥18 MET hours/week is highly associated with better erectile/sexual function regardless of race. Simon RM, Howard L, Zapata D, Frank J, Freedland SJ, and Vidal AC. The association of exercise with both erectile and sexual function in black and white men. J Sex Med **;**:**–**.Journal of Sexual Medicine 03/2015; DOI:10.1111/jsm.12869 · 3.15 Impact Factor
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ABSTRACT: Body weight in different mammalian species influences reproductive potential. The aim of the present study was to determine the relationship of body weight at the time of semen collection with libido, seminal characteristics and number of semen doses for artificial insemination (AI) in New Zealand White mature fertile male rabbits. Data came from 728 semen collections of 14 rabbits, 15-months of age that were sexually experienced with proven semen quality and fertility. Semen collection was performed twice a week with two ejaculates at each collection time and lasted 14 weeks. A second ejaculation was collected at 1-2h after the first. Data from each male from first and second ejaculates from 1 day of semen collection throughout the trial were averaged (n=324) and partial correlation coefficients and regression equations were estimated to describe the relationship of male body weight to ejaculation reaction time and 12 semen and sperm characteristics. As body weight increased there was a linear (P<0.05) increase in reaction time, abnormal sperm with an intact membrane and abnormal sperm with a damaged membrane and a linear (P<0.05) decrease in semen volume, sperm concentration per ejaculate, normal sperm with an intact membrane, number of normal motile sperm with an intact membrane and suitable semen doses for AI. Body weight of the mature male rabbit at semen collection had some influence on libido, semen and sperm characteristics, with a general trend toward a lesser reproduction potential as body weight increases. Copyright © 2014 Elsevier B.V. All rights reserved.Animal Reproduction Science 11/2014; DOI:10.1016/j.anireprosci.2014.11.005 · 1.58 Impact Factor