Effect of spaceflight on the human body of muscle fibre prominent in muscles also change. Slow twitch endurance fibres used to maintain posture are replaced by fast twitch rapidly contracting fibres that are insufficient for any heavy labour. Advances in research on exercise, hormone supplements and medication may help maintain muscle and body mass. Bone metabolism also changes. Normally, bone is laid down in the direction of mechanical stress. However, in a microgravity environment there is very little mechanical stress. This results in a loss of bone tissue approximately 1.5% per month especially from the lower vertebrae, hip and femur. Due to microgravity and the decreased load
John T. Bone John T. Bone John Bowen is a British-born and American pornographic movie director who uses the name John T. Bone. He is best known for directing two large gang bang movies: "World's Biggest Gang Bang" in 1995 starring Annabel Chong, and "World's Biggest Gang Bang II" in 1996 starring Jasmin St. Claire. Bowen started in 1985 and is a member of the AVN Hall of Fame. He has worked for numerous studios and, as Harry Horndog, has also acted in some porn movies. He is best known for directing two large gang bang movies: "World's Biggest Gang Bang" in 1995