Effects of Microgravity on Muscle and Bone Health in Astronauts During Space Missions: Preventive Procedures and Medical Interventions

Microgravity has a significant impact on muscle health and muscle physiology of astronauts during space missions.In a microgravity environment, muscles undergo atrophy, which is characterized by a decrease in muscle mass and volume.This atrophy occurs due to the reduced mechanical load normally exerted by gravity on Earth, resulting in decreased muscle strength and endurance.In addition, changes in muscle fiber and muscle tissue composition also occur, where there is a decrease in type I muscle fibers (which contract slowly and last long) and an increase in type II muscle fibers (which contract quickly but fatigue quickly) [1].The mechanism supporting these changes involves mus-cle adaptation to the microgravity environment.Reduced physical activity under microgravity conditions reduces the mechanical stimulus required to maintain muscle mass.According to Barratt and Pool [2] in the book "Principles of clinical medicine for space flight", muscle adaptation to this environment includes changes in gene expression and molecular signaling that regulate muscle growth and degradation.Space radiation has different impacts on bone cells, especially osteoclasts and osteoblasts.Research shows that radiation can increase the activity of osteoclasts, the cells responsible for bone resorption, and reduce the activity of osteoblasts, the cells responsible for bone formation.Barratt and Pool [3] in the book "Principles of clinical medicine for space flight" also emphasize that this leads to Effects of Microgravity on Muscle and Bone