C‑reactive protein (CRP) flags inflammation simmering in the background. However, comparison of sociodemographic and health-related variables from BACH with other large regional (Boston Behavioral Risk Factor Surveillance System) and national (National Health Interview Survey) surveys have shown that the BACH estimates are comparable to national trends on key health related variables. History of comorbid conditions was assessed by self-report with the potential for reporting and/or recall bias; however, previous research has demonstrated the reliability and validity of self-report for heart disease, diabetes, and hypertension.30 The BACH study was limited geographically to the Boston area. The estradiol and CRP association was attenuated but remained significant in multivariate models; however, this association was further attenuated and statistically non-significant after adjusting for intra-abdominal fat. Additional covariates did not further attenuate the observed association. BMI had the largest impact on the association of CRP with T and SHBG level with changes of 35–40% in the regression coefficients after adding BMI to the model. Male hypogonadism is defined according to both biochemical findings and clinical symptoms, with highest predictive value shown by decreased morning erection, libido, and sexual desire (6). Furthermore, the incidence of T2D and hypertension increases with age as well as required treatment, further affecting the inflammatory-hypogonadic relationship. RIA technique has been considered a less reliable measurement method of testosterone levels compared to mass spectrometry, especially at lower levels (40). However, the use of two measurements could also strengthen the study as it would permit the investigation of these associations in a prospective design. A limitation was the change of the method used for measurements of testosterone during the study. Additionally, serum levels of TT, estradiol (E2), dehydroepiandrosterone sulfate (DHEA-S), insulin (I), and sex hormone-binding protein (SHBG) were assessed using ELISA. Untreated sleep apnea, hypothyroidism, and chronic inflammatory diseases can raise CRP and perturb sex hormones. Strengths of the BACH study include a community-based random sample across a wide age range (30–79 years), inclusion of large numbers of minority participants representative of Black and Hispanic populations, and a wide range of covariates including sociodemographic, lifestyle, and health variables, which can be adjusted for in the analysis. This was a longitudinal observational study between 2002 and 2014 in Sweden. The participants provided their written informed consent to participate in this study. The studies were conducted in accordance with the local legislation and institutional requirements. The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation. It is important to note that age-related hormonal changes in men may also be influenced by modifiable lifestyle factors. Additionally, no information was gathered regarding the specific motivation behind participants’ decisions to take part in the study. Testosterone measured by liquid chromatography–mass spectrometry is more accurate at low levels than some immunoassays, which can be biased. Magnesium supports sleep quality and insulin sensitivity, which can indirectly influence both biomarkers. Zinc deficiency can impair testosterone synthesis; repletion helps in true deficiency but not in surplus. On the flip side, chronic overreaching without recovery can suppress testosterone and keep CRP smoldering. Aerobic activity improves insulin sensitivity and reduces visceral fat, which lowers inflammatory signaling. Curious how training and meals interact to move these markers? Longstanding collaborations with DoD-funded programs and federal agencies. Salimetrics devices with published stability data for field deployment. Fully documented for IRB submissions and DoD research compliance. Furthermore, the study did not collect detailed, controlled data on socio-economic status, diet, or lifestyle factors, which prevented adjustment for potential confounders. Supporting this, Kaplan et al. also reported an inverse association between serum testosterone and high-sensitivity C-reactive protein (hsCRP) in elderly men (29). These results underscore the widespread prevalence of testosterone deficiency in older men when considering biochemical markers.
