The Regulation Of Blood Pressure

What Does Using Gravity Mean? Although space flight research began more than 50 years ago, there is still much we don’t know about how gravity affects our bodies. For example, we do not yet know all of the ways our body senses gravity and what all the various characteristics of gravity are. However, we do know gravity pulls down to the center of the earth, and it exerts its maximum effect when we stand up. We also know that sitting largely counteracts the beneficial effects of gravity. Markers of bone loss can be detected in as little as three to four days, and aerobic fitness can decrease by as much as 25 percent within that same time frame. Changes happen very quickly when we thwart the helpful effects of gravity. So, to find the minimum amount of time that must be spent upright, we had our subjects get up for 15 minutes, either every hour on the hour or every two hours, for a total of 16 to 8 times per day. Each subject went through all of the experimental conditions, and each was given a month between exposures to recover. In this way they served as their own controls. They stayed in bed and, for the getting up requirement, either simply stood by the bed or walked on a treadmill at a gentle pace. You would have guessed that walking would have been more effective. In fact, the longer one stands, the lesser the stimulation of the blood vessel walls, because when we stand still for very long our leg muscles start to quiver and contract to keep us upright.

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Thus, the shorter but more frequent changes in posture, the greater the benefit to the regulation of blood pressure. Standing up often is what matters, not how long you remain standing. If you stand up 16 times a day for two minutes, the body would read that as 16 stimuli, whereas if you stood once and remained standing for 32 minutes, it would see that as one stimulus. Since we did not test shorter periods, it is probable that much less time walking on the treadmill for each bout would have been adequate. As muscles contract, they pull bone in every which way, even at the low speeds we used, as long as the subjects are upright or changing posture frequently. At seminars, I like to ask my audiences how much and how often they exercise. Their answers range from three to five times a week and from 30 minutes to one hour a day. My question then is, What do you do the other 23 hours? Well, given seven to eight hours of sleep, what do you do the other 15 to 16 hours? This is invariably greeted by nervous giggles. I can just hear what they are thinking! It works by metabolizing fat calories that accumulate through the diet and it regulates insulin, free fatty acids, and triglyceride production by controlling sugar in the bloodstream. These are movements that occur naturally throughout the day when you’re doing activities other than sitting. At the University in the, United Kingdom, point out that animals use for these purposes a type of muscle that humans have as well, although our modern sedentary lifestyle has allowed it to weaken. Skeletal muscles can be categorized into two broad categories, depending on their structure and the way they work.

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Stabilizers become weaker faster when they no longer have to work against gravity. They can produce only low forces of contraction often with no obvious movement. Think of the deep muscles along your spine that keep you upright. If they did not work you would tilt forward. The back of your neck muscles support your head. If they are weakened your head would tip forward, which could be lethal. Does it occur more than impotence ever did? Has it just come out of the closet, or is it just another example of the old and lucrative market for male enhancement? Today, Viagra is a household ingredient on the spice rack. Testosterone levels are reduced in space and by lying in bed continuously, and should be with prolonged sitting. The same is true for the endothelium, the lining of the smooth muscle of blood vessels. The penis is a spongy tissue filled with blood vessels. An erection occurs when the endothelium is stimulated and the vessels relax and fill up with blood. That is how it works.

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Furthermore, sitting occludes the blood circulation to the genital area, especially if one is overweight or obese. Anything that limits the amount of blood in the penis determines the extent of the erection. Stabilizers, the muscles least used in your gym exercises, rely on low and sustained effort, less than 30 percent of a maximum voluntary contraction, and may or may not result in movement. Such energy efficiency depends on larger numbers of healthy mitochondria, the energy machines inside cells. This results in disturbed oxidative metabolism, producing damaging oxygen peroxides, resistance to insulin, accumulation of fatty triglycerides inside the muscle, and a reduced protection by antioxidants. Loading up on antioxidant pills is a poor solution. However, at Dublin City University, Ireland, points out that a simple correction of this dysfunction in stabilizer muscle cells would involve activities that use gravity in a manner that targets gene expression of mitochondrial and fatty acid oxidation processes to enrich mitochondria, increase oxidative capacity, and resistance to fatigue. What does all this mean? Why discuss insulin, diabetes, and obesity? Next time you reach for that electric cart at the supermarket or the golf course, give an extra thought to your stabilizers. They are what make it possible for you to hang on to your independence as you age, for your legs to carry you, and for you to stand up and move, without back or neck pain. It is these types of small movements and activities that do not happen enough when a person is habitually inactive. Thus, people who move around a lot all day, even if they don’t go to the gym or