Can going to the sauna help your BP?

I know lots of my readers take part in sporting competitions and they always want to perform at their peak and win.  So is it best to abstain the night before a competition?  Certainly here is a myth that abstinence before sporting activities improves performance? But does it? Researchers at the University of Florence reviewed hundreds of studies to determine if there was any truth in the myth that abstinence helps performance.  They found no evidence to support the myth that abstinence before a sporting competition improves performance.  In addition they found no evidence that having sex the night before impairs performance the next day.  They came across one study that found marathon runners did better the next day after having sex the night before. All sporting competitions are as much about the mind as the physical activity.  So the impact of sex the night before on marathon runners may be psychological.  Maybe that is why the organisers of the Rio Olympics distributed more than 450,000 condoms in the athletes' village during the 2016 Olympics. Reference Stefani Laura, Galanti Giorgio, Padulo Johnny, Bragazzi Nicola L., Maffulli Nicola, 2016, Sexual Activity before Sports Competition: A Systematic Review,  Frontiers in Physiology, Vol 7, pg 246 http://journal.frontiersin.org/article/10.3389/fphys.2016.00246

People in the UK are low in vitamin D because of the weakness of the sunlight and the short summers.  In addition there is greater concern in the UK about getting skin cancer from sunbathing or being out in the sun.  Almost every rheumatoid arthritis sufferer has low levels of vitamin D and this is likely to be true for people with other inflammatory diseases too. Sunshine isn't the only source of vitamin D.  Some foods such as eggs, oily fish such as sardines and salmon are rich in vitamin D too.  Reserachers from the university of brimingham are the lastest to report in the importance of vitamin D.  In a series of tests, they discovered that the immune cells of rheumatoid arthritis pateients could still respond normally to vitamin D by supressing inflammatory signalling - if those cells were circulating in the blood,  but the same cell type when localisec to the fluid around the arthricitc joints, showned no anti-inflamatory reaction to vitamin D.  This is because arthritis leads to vitamin D insensitivity which means that cells no longer respond to it. The research suggest that vitmain D therapy could still work on patients if they are given very high doeses, although standard suplements amy not.  Prof Martin Hewison says that "almost everyone in the Uk has vitamin D deficiency".  High levels of vitamin D can help prevent inflamatory diseases including rheumatiod arthritis. Reference https://www.sciencedirect.com/science/article/pii/S0896841117304201

The standard theory of heart disease states that fatty foods cause the arteries to "clog up" and narrow, which is a major feature of cardiovascular disease.  Researchers have discovered that a lack of sleep seem to have more to do with hardening of the arteries (atherosclerosis) than a fatty diet. Not getting enough sleep on a regular basis can cause a buildup of plaque in the arteries, which causes them to stiffen and eventually close. Researchers at Massachusetts General Hospital now think that hardening of arteries has more to do with a "neuro-immune axis" linking sleep to the cardiovascular system.  Sleep helps regulate the production of inflammatory cells and maintain healthy blood vessels, and so it would follow that lack of sleep has the reverse effect. The researchers demonstrated the effect on a group of laboratory mice.  Although the cholesteral levels of sleep deprived ice remained the same, they developed larger arterial plaques and had double the number of inflammatory cells known to contribute to hardening of arteries. Reference Tall AR, Jelic S. How broken sleep promotes cardiovascular disease. Nature. 2019 Feb;566(7744):329-330