Physiological reductions comparing space/HDBR and ageing
On Earth, gravity has been considered the enemy that drags us down and ages us. But the reverse is true. From birth, from the buoyancy of the womb through peak development, children intuitively learn from the beginning to use gravity in the design and function of their body. They do this by moving and orienting themselves in as many ways as possible, exposing all parts of their body to this universal stimulus. Skeletal, neuro-muscular and cardiovascular stimuli are below threshold in the microgravity of space, which results in a 10-times faster onset of atrophy. On return to Earth functional capacity is equally reduced 10-times faster than in ageing. There are comparable underlying metabolic and morphological disturbances where decreased mechano-transduction is a common factor. As more advances are emerging from the science of ageing, such as the discovery of telomeres, it has become possible to compare these with those in space. Though gravity is ever-present on Earth, it is useless if we do not use it.
Deconditioning in space from gravity deprivation, and reduced gravity influence in bed rest, have drawn attention to the medical hazards of gravity withdrawal in other gravity-related conditions, such as sedentary office work and other ageing lifestyles. Today’s prolonged hours of uninterrupted sitting in both these cases have been linked to atrophic, inflammatory and metabolic conditions, from cancer, diabetes, obesity, cardiovascular changes and ageing. The answer simply lies in relearning to use gravity, much as a child does when playing – moving from dawn to dusk, incorporating multiple changes in posture with intermittent, low intensity, high frequency movement.
Gravity clearly plays a role from cradle to grave. Understanding that role may, in fact, provide sought-after simple and inexpensive solutions to a broad variety of today’s common disorders, all the way to achieving greater independence and longevity.
"The body electric" as Walt Whitman eloquently described the human physique in the full flush of health almost 100 years ago (Forbes, April 2, 1921) "is attainable by all. It is a matter of living sanely, according to the dictates of common sense."