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Gravitation – Effects on the Human Body and Medicine

Gravitation is the natural attractive force between masses. In medicine, it influences posture, circulation, and the musculoskeletal system.

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Things worth knowing about "Gravitation"

Gravitation is the natural attractive force between masses. In medicine, it influences posture, circulation, and the musculoskeletal system.

What is Gravitation?

Gravitation (also referred to as gravity) is one of the four fundamental forces of nature. It describes the mutual attraction between masses. On Earth, it acts as a constant downward force and has far-reaching effects on the human body, physiology, and medicine.

Physical Principles

The gravitational force was first described by Isaac Newton and later expanded upon by Albert Einstein in his General Theory of Relativity. At the surface of the Earth, the gravitational acceleration is approximately 9.81 m/s². This constant force acts on all objects with mass and is responsible for the upright posture of humans as well as numerous physiological adaptations of the body.

Relevance of Gravitation to the Human Body

Musculoskeletal System and Posture

The human body has evolved in accordance with Earth´s gravity. Bones, muscles, ligaments, and joints are designed to withstand the constant pull of gravity. The spine plays a central role in load distribution and is subjected to significant gravitational pressure every day. Prolonged poor posture or mechanical overload can lead to disc herniation, scoliosis, or osteoarthritis.

Cardiovascular System

Gravity has a major influence on blood flow. The heart must pump blood upward against gravity to supply the upper body and brain. Orthostatic hypotension – a sudden drop in blood pressure upon standing – is a well-known example of gravity´s impact on the circulatory system. Venous valves in the legs assist in returning blood to the heart against the force of gravity.

Lymphatic System and Fluid Balance

The lymphatic system is also affected by gravity. Prolonged standing or sitting can lead to edema (fluid accumulation) in the legs, as gravity impairs the return of tissue fluid to the circulation.

Medical Relevance: Weightlessness and Its Effects

The importance of gravity becomes especially evident when it is absent or reduced – as in the case of astronauts in microgravity. Without the constant load of gravity, the following effects occur:

Bone loss (osteoporosis): Bones deteriorate without mechanical loading.
Muscle loss (muscle atrophy): Muscles weaken without resistance.
Fluid redistribution: Body fluids shift toward the upper body and head, potentially causing headaches and visual impairment.
Cardiovascular deconditioning: The cardiovascular system must recalibrate its regulatory mechanisms.

These findings from space medicine provide valuable insights into the treatment of immobility and bed rest on Earth.

Therapeutic Use of Gravity

Traction and Extension Therapy

In physiotherapy and orthopedics, gravity is used therapeutically. Spinal traction uses body weight to elongate the spine, relieving pressure on intervertebral discs and nerves.

Hydrotherapy

In water, the effective gravitational load is reduced by buoyancy. This allows for gentle movement therapy in patients with joint disease or following surgery, as the joints are relieved of weight-bearing stress.

Positioning Therapy

In intensive care medicine, body positioning is deliberately modified (e.g., head-of-bed elevation or prone positioning) to harness gravitational effects on lung ventilation, circulation, and wound healing.

Gravitation and Rehabilitation

Gravitational influences play a central role in rehabilitation. The gradual restoration of load-bearing capacity after injury or surgery takes into account the mechanical demands imposed by gravity. Gait training, balance exercises, and strength training are specifically designed to prepare the body for the gravitational demands of everyday life.

References

Harridge, S. D. R. & Lazarus, N. R. (2017). Physical activity, aging, and physiological function. Physiology, 32(2), 152–161. doi:10.1152/physiol.00029.2016
Vernikos, J. & Schneider, V. S. (2010). Space, gravity and the physiology of aging: parallel or convergent disciplines? A mini-review. Gerontology, 56(2), 157–166. doi:10.1159/000252852
World Health Organization (WHO) (2020). Physical activity and sedentary behaviour guidelines. Geneva: WHO Press.

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