After Long Term Exposure To Altitude Case Study

2102 Words 9 Pages
1. After long term exposure to altitude, the body makes several adjustments in order to perform physical activity in the hypoxic condition.
A) What chronic adaptations are most beneficial for performance at altitude?
When one goes into high altitudes their immediate response are somewhat negative the increase in ventilation, decrease in carbon dioxide, respiratory alkalosis, being in a hypoxic state and many more. However, when having an exercise performance such as the winter Olympics one should take the proper precautions. Chronic adaptations to altitude include pulmonary, cardiovascular, muscle, nutrition/metabolism function. When pertaining to Desplanches et al. their researched was predominately looking at how changes in the pH can affect
…show more content…
Our skeletal system is the backbone of our posture, our strength to stand and perform multiple functions like walking, running, dancing etc. In absence of gravity, less resistance or strain that is applied to bones and joints may result in an increase of bone loss. Due to bone loss, bone mineral density decreases by approximately 1% per month which result into weak bones and more prone to fractures. All processes starting from bone formation, new bone deposition to bone mineralization decreases or stops during the phase of weightlessness while one is microgravity. Causing a decrease in calcium absorption and mRNA. Thus resistance training is a necessary component of training regimen in space to prevent drastic loss that can be detrimental when once back on earth. There are many exercise countermeasures with resistance training being the most important because it increase the necessary component to maximize muscle stimulation. Resistance training increases the physical stresses on bone (7). These stresses help activate the osteoblasts and favor bone deposition. Schulze et al. mentioned how longer duration in space can have a detrimental effect on the musculoskeletal which is known, but finding the solution of how long one should perform resistance training is still up in the air. Therefore, their purpose was to investigate if a low volume, high intensity resistance training program could benefit …show more content…
However, Stein looked into how each one of these factors food intake, exercise, and energy balance work together. His purpose was is to see what can be learned about the muscle loss problem by comparing metabolic results across the six missions. While in space astronauts are usually at a negative energy balance and in the study it was explained that energy deficit can be caused by either by a decrease intake or an increased in activity (9). Nevertheless, humans can survive with long term energy deficit because our body can use fat as a substrate. What was also found in the study was as astronauts engaged in exercise while showing and increase in energy deficit there was also decrease in protein synthesis. A concern of the depressed protein metabolism is a reduction in anti-oxidant defenses (9). The principal reason for this concern is the control of free radicals in the body that is leaking from the electron transport chain when you are increasing exercise, yet your body is having a decrease in protein synthesis(9). Free radicals can cause cell, and tissue damage which can decrease your fitness in space along with making one more susceptible to illness. It was concluded that there needs to be a higher intake of protein to combat the decrease in protein synthesis which can help boost anti-oxidant defense that can control free

Related Documents