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Testosterone Replacement, Low T, HCG, & Beyond
Testosterone Basics & Questions
Cycling HCG
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<blockquote data-quote="Nelson Vergel" data-source="post: 1315" data-attributes="member: 3"><p>Jsmma</p><p></p><p>Click on links please.</p><p></p><p>Interesting data on <a href="http://link.springer.com/article/10.1007/BF00379398" target="_blank">shift work.</a></p><p></p><p>In a study of the internal desynchronization of circadian rhythms in 12 shift workers, 4 of them, aged 25 to 34 years, agreed to be sampled every 2 h during their night shift (0000 hours to 0800 hours). They were oil refinery operators with a fast rotating shift system (every 3 to 4 days). We found marked changes in the secretory profiles of melatonin, prolactin and testosterone. Melatonin had higher peak-values resulting in a four-times higher amplitude than in controls. With respect to prolactin and testosterone, peak and trough times were erratic and the serum concentrations were significantly decreased in shift workers. Serum cortisol presented a decreased rhythm amplitude together with higher concentrations at 0000 hours in shift workers. This study clearly shows that fast rotating shift-work modifies peak or trough values and rhythm amplitudes of melatonin, prolactin, testosterone and cortisol without any apparent phase shift of these hormones. Whether the large rhythm amplitude of melatonin may be considered as a marker of tolerance to shift work, as reported for body temperature and hand grip strength, since it would help the subjects to maintain their internal synchronization, needs further investigation.</p><p></p><p><strong><a href="http://oem.bmj.com/content/58/11/747.short" target="_blank">Is there an association between shift work and having a metabolic syndrome? Results from a population-based study of 27,485 people</a></strong></p><p>In this study, obesity, high triglycerides, and low concentrations of HDL cholesterol seem to cluster together more often in shift workers than in day workers, which might indicate an association between shift work and the metabolic syndrome.</p><p></p><p><a href="https://www.jstage.jst.go.jp/article/indhealth/43/1/43_1_34/_pdf" target="_blank">Light therapy and regulation may help shift workers' health</a></p></blockquote><p></p>
[QUOTE="Nelson Vergel, post: 1315, member: 3"] Jsmma Click on links please. Interesting data on [URL='http://link.springer.com/article/10.1007/BF00379398']shift work.[/URL] In a study of the internal desynchronization of circadian rhythms in 12 shift workers, 4 of them, aged 25 to 34 years, agreed to be sampled every 2 h during their night shift (0000 hours to 0800 hours). They were oil refinery operators with a fast rotating shift system (every 3 to 4 days). We found marked changes in the secretory profiles of melatonin, prolactin and testosterone. Melatonin had higher peak-values resulting in a four-times higher amplitude than in controls. With respect to prolactin and testosterone, peak and trough times were erratic and the serum concentrations were significantly decreased in shift workers. Serum cortisol presented a decreased rhythm amplitude together with higher concentrations at 0000 hours in shift workers. This study clearly shows that fast rotating shift-work modifies peak or trough values and rhythm amplitudes of melatonin, prolactin, testosterone and cortisol without any apparent phase shift of these hormones. Whether the large rhythm amplitude of melatonin may be considered as a marker of tolerance to shift work, as reported for body temperature and hand grip strength, since it would help the subjects to maintain their internal synchronization, needs further investigation. [B][URL='http://oem.bmj.com/content/58/11/747.short']Is there an association between shift work and having a metabolic syndrome? Results from a population-based study of 27,485 people[/URL][/B] In this study, obesity, high triglycerides, and low concentrations of HDL cholesterol seem to cluster together more often in shift workers than in day workers, which might indicate an association between shift work and the metabolic syndrome. [URL='https://www.jstage.jst.go.jp/article/indhealth/43/1/43_1_34/_pdf']Light therapy and regulation may help shift workers' health[/URL] [/QUOTE]
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Testosterone Replacement, Low T, HCG, & Beyond
Testosterone Basics & Questions
Cycling HCG
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