Factors mediating spaceflight-induced skeletal muscle atrophy

Area of Science:

• * Space biology and physiology
• * Skeletal muscle research
• * Space medicine

Background:

• * Spaceflight leads to skeletal muscle atrophy and dysfunction, posing risks to astronaut health and mission success.
• * This atrophy shares similarities with terrestrial conditions, offering potential insights for Earth-based treatments.
• * Microgravity-induced muscle unloading is a primary driver, but other spaceflight factors may also contribute.

Purpose of the Study:

• * To provide a comprehensive overview of spaceflight environmental factors contributing to skeletal muscle atrophy.
• * To explore novel mechanisms beyond microgravity that cause muscle atrophy during space missions.
• * To synthesize findings from spaceflight, ground-based models, and in vitro studies.

Main Methods:

• * Systematic review of existing literature on spaceflight-induced muscle atrophy.
• * Analysis of data from actual space missions and ground-based simulations.
• * Inclusion of studies on humans, animals, and in vitro systems.

Main Results:

• * Microgravity and muscle unloading are significant contributors to spaceflight-induced muscle atrophy.
• * Other spaceflight environmental factors (e.g., radiation, confinement) may also directly or indirectly impact skeletal muscle.
• * Diverse models reveal consistent patterns of muscle atrophy across different research approaches.

Conclusions:

• * Spaceflight presents unique challenges to skeletal muscle health.
• * A multifactorial approach is necessary to fully understand and mitigate muscle atrophy in astronauts.
• * Research into spaceflight-induced atrophy can inform strategies for treating muscle loss on Earth.