The percentages of abnormal sperm were expressed as a fraction of total counted sperm. A total of 10 µl of the diluted specimen was transferred to one of the hemocytometer chambers for examination under a light microscope. The percentages of the motile, progressive, and immotile sperm were expressed as fractions of total counted sperm according to Shokri et al. (22). After dissecting each testicle and caudal epididymis, whole body perfusion with formalin was performed for fixation. Heart blood was collected for measurement of serum hormones (12). SCI mice received a daily intraperitoneal injection (IP) of testosterone (0.5 mg/kg) either immediately or one week after the surgery for a 7- or 35-day period (2, 12, 21). In contrast, lower testosterone levels can lead to weakened disc structure, making them more susceptible to herniation. Optimal testosterone levels promote the synthesis of proteins, such as collagen, that are crucial for maintaining the strength and flexibility of these discs. In this article, we’ll delve into the latest scientific findings to explore whether testosterone truly holds promise for alleviating the symptoms of a herniated disc. Many people wonder if low testosterone can cause back pain. This creates a cycle where the spine becomes less supported by muscle, more vulnerable to stress, and more likely to produce pain. When low testosterone is added to the normal effects of aging, the loss of strength and bone density may happen faster. Age-related decline can be significant because muscles and bones also weaken with aging. For others, especially those with other health conditions like obesity, diabetes, or long-term stress, testosterone may drop more quickly. When testosterone is low, the rate of bone breakdown can become faster than the rate of bone rebuilding. Weakness in these muscles can make the back work harder, which may increase the risk of muscle strain or mechanical back pain. The rate of decline in serum total T, free T, and sex hormone binding globulin (SHBG) in healthy men in the Massachusetts Male Aging Study was compared to the respective rates of decline in the measures of T in our SCI cohort.1 The normative data on men with low serum total T concentration and free T index from the Baltimore Longitudinal Study on Aging was compared to our SCI subjects, both cohorts categorized by decade of life.4 Compared with the general population, low serum total testosterone concentration occurs earlier in life in men with SCI, at a higher prevalence by decade of life, and their age-related decline in circulating total testosterone concentration is greater. Forty-six percent of men with SCI were identified as having low serum total testosterone concentrations (total testosterone Future studies should measure sex-hormone binding globulin levels and address the impact of bioavailable or free circulating T on body composition and metabolic profile in individuals with SCI. Furthermore, we measured total serum T levels without measuring free or bioavailable T concentrations. Meaning that at baseline, free testosterone levels in blood may be overestimated. In individuals with tetraplegia, serum testosterone concentrations remained significantly lower than those of the controls during the entire 4-month testing period . Naftchi et al. measured sex hormones in urine once a week for four months starting from the onset of the injury . Higher prevalence of testosterone deficiency was reported among individuals with motor complete (as compared to motor incomplete) and cervical (as compared to thoracic/lumbosacral) injuries and among individuals using narcotic medications for pain management 17,19,35. Low testosterone levels reported in the literature varied from 10% to more than 70% of men with SCI . We observed a non-linear association between age and injury duration and hormone levels. Low testosterone can weaken muscles and bones, which may increase the chances of developing back discomfort. For people diagnosed with low testosterone, the best results often come from combining TRT with a larger plan for spine and muscle health. Research shows that TRT can increase lean muscle, improve strength, and slow or reverse bone loss in people who have medically confirmed low testosterone. When testosterone levels drop too low, bone density can decline. Of those studied with LHRH stimulation, 16 of 30 subjects with SCI had exaggerated LH responses and 6/30 had elevated FSH responses.22 Previously, our group reported that persons with SCI tend to have increased gonadotropin release to standard provocative stimulation to LHRH compared with able-bodied controls.30 In a preliminary report that addressed the end-organ responsiveness, testicular stimulation with hCG was similar in subjects with SCI and able-bodied controls.30 The annual increase in SHBG in the group with SCI was markedly greater than in healthy able-bodied persons, raising the prevalence rates for low free T index for those with SCI in the earlier decades of life (i.e. from the 20 to 50s). Bioavailable T concentration is the non-protein bound T, which is the serum T fraction not precipitated by 50% ammonium sulfate concentration; the free T concentration employs both albumin and SHBG concentrations in the calculation to approximate the "true" free T concentration obtained by the equilibrium dialysis method; 80% of the subjects had a normal bioavailable T concentration, whereas 79% had a low free T concentration (Table 2). When testosterone enters the bloodstream through TRT, it attaches to receptors in cells. This hormone acts just like natural testosterone produced in the testicles or ovaries. When levels drop too low, a person may develop symptoms that affect daily life. If fractures occur, pain can become severe and limit daily activities. Some people feel mild, dull back pain that slowly gets worse. If bone density drops too low, the vertebrae can become weak. Several studies have explored whether men with low testosterone experience more chronic musculoskeletal pain. This question comes up often because testosterone affects muscles, bones, and energy levels—all things that play an important role in how the spine works. TRT may support the body’s ability to build and maintain muscle and bone, but it is not a stand-alone treatment for back pain. Because testosterone affects both muscles and bones, many people with chronic back discomfort want to know if treating low testosterone could help. Many people notice a loss of muscle mass, a drop in strength, an increase in body fat, or a decrease in bone density. When levels drop, it can lead to muscle weakness, reduced bone density, and inflammation in spinal joints.
