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Locomotion in space
Locomotion in space includes all actions or methods used to move one's body in microgravity conditions through the outer space environment. Locomotion in these conditions is different from locomotion in a gravitational field. There are many factors that contribute to these differences, and they are crucial when researching long-term survival of humans in space.
Humans have evolved in a 1-G environment and are therefore accustomed to Earth's standard atmospheric conditions, and the microgravity environment of space can have huge effects on the human body and its locomotion.
The environmental conditions in space are harsh and require extensive equipment for survival and completion of daily activities. There are many environmental factors to consider both inside and outside of a spacecraft that astronauts work in. These factors include but are not limited to movement during weightlessness, general equipment necessary to travel to the desired destination in space, and gear such as space suits that hinder mobility.
When doing extravehicular activities (EVA), it is important to be protected from the vacuum of space. Exposure to this harsh environment can cause death in a small amount of time. The main environmental factors of concern in space include but are not limited to the following :
There are many detrimental effects of extended exposure to reduced gravity that are similar to aging and disease. Some long-duration effects of reduced gravity can be simulated on Earth using bed rest. These effects include:
The muscle volume can decrease up to 20% over a six-month mission, and the bone density can decrease at a rate of approximately 1.4% at the hip in a month's time. A study done by Fitts and Trappe examined the effects of prolonged space flight (defined as approximately 180 days) on human skeletal muscle using muscle biopsies. Prolonged weightlessness was shown to cause significant loss in the mass, force, and power production in the soleus and gastrocnemius muscles. Many countermeasures to these effects exist, but thus far they are not sufficient to compensate for the detrimental effects of space travel and astronauts need extensive rehabilitation upon their return to Earth.
In order to compensate for the negative effects of prolonged exposure to microgravity, scientists have developed many countermeasure technologies with varying degrees of success.
Transcutaneous electrical muscle stimulation (EMS) is the use of electric current to stimulate muscle activity. This method is theoretically utilized to prevent muscle atrophy and weakness. The efficacy of this approach was tested in a 30-day bed rest study done by Duovoisin in 1989. Though the patients showed decreased rates of muscle atrophy in the stimulated limb, there was not evidence to support that this method would necessarily prevent these effects. More recently, in 2003, Yoshida et al. did a study related to hind limb suspension in rats. This study concluded that the hind limb suspension and EMS did have some success in the prevention of muscle function deterioration induced by disuse. There have been several scientific studies conducted that mention the application of this technique as a countermeasure in long-term spaceflight.
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Locomotion in space
Locomotion in space includes all actions or methods used to move one's body in microgravity conditions through the outer space environment. Locomotion in these conditions is different from locomotion in a gravitational field. There are many factors that contribute to these differences, and they are crucial when researching long-term survival of humans in space.
Humans have evolved in a 1-G environment and are therefore accustomed to Earth's standard atmospheric conditions, and the microgravity environment of space can have huge effects on the human body and its locomotion.
The environmental conditions in space are harsh and require extensive equipment for survival and completion of daily activities. There are many environmental factors to consider both inside and outside of a spacecraft that astronauts work in. These factors include but are not limited to movement during weightlessness, general equipment necessary to travel to the desired destination in space, and gear such as space suits that hinder mobility.
When doing extravehicular activities (EVA), it is important to be protected from the vacuum of space. Exposure to this harsh environment can cause death in a small amount of time. The main environmental factors of concern in space include but are not limited to the following :
There are many detrimental effects of extended exposure to reduced gravity that are similar to aging and disease. Some long-duration effects of reduced gravity can be simulated on Earth using bed rest. These effects include:
The muscle volume can decrease up to 20% over a six-month mission, and the bone density can decrease at a rate of approximately 1.4% at the hip in a month's time. A study done by Fitts and Trappe examined the effects of prolonged space flight (defined as approximately 180 days) on human skeletal muscle using muscle biopsies. Prolonged weightlessness was shown to cause significant loss in the mass, force, and power production in the soleus and gastrocnemius muscles. Many countermeasures to these effects exist, but thus far they are not sufficient to compensate for the detrimental effects of space travel and astronauts need extensive rehabilitation upon their return to Earth.
In order to compensate for the negative effects of prolonged exposure to microgravity, scientists have developed many countermeasure technologies with varying degrees of success.
Transcutaneous electrical muscle stimulation (EMS) is the use of electric current to stimulate muscle activity. This method is theoretically utilized to prevent muscle atrophy and weakness. The efficacy of this approach was tested in a 30-day bed rest study done by Duovoisin in 1989. Though the patients showed decreased rates of muscle atrophy in the stimulated limb, there was not evidence to support that this method would necessarily prevent these effects. More recently, in 2003, Yoshida et al. did a study related to hind limb suspension in rats. This study concluded that the hind limb suspension and EMS did have some success in the prevention of muscle function deterioration induced by disuse. There have been several scientific studies conducted that mention the application of this technique as a countermeasure in long-term spaceflight.