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Spinal shrinkage due to +Gz forces

O Hämäläinen¹, H Vanharanta, M Hupli

¹Air Force Academy, Kauhava, Finland.

Aviation, Space, and Environmental Medicine

|July 1, 1996

Summary

High G-force exposure significantly reduces fighter pilot body height, indicating substantial spinal stress. This highlights the physically demanding nature of aerial combat maneuvers on pilots.

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Area of Science:

Aerospace Medicine
Human Physiology
Spinal Biomechanics

Background:

Fighter pilots report frequent spinal pain, particularly in the cervical and lumbar regions.
High +Gz forces may contribute to premature cervical disc degeneration.
The impact of high +Gz forces on lumbar spine degeneration remains unstudied.

Purpose of the Study:

To investigate the effect of high +Gz forces during aerial combat maneuvers on fighter pilot body height.
To assess acute changes in body height due to G-force exposure.

Main Methods:

Body height was measured in 20 junior fighter pilots before and after high-G flights.
Measurements were taken after 30 minutes of recumbent rest and while seated in a fighter aircraft.
A specialized measuring device was employed for precise height assessment.

Main Results:

Forty minutes of high +Gz maneuvering resulted in a 4.9 mm decrease in body height.
Recumbent rest increased body height by 2.5-3.5 mm.
Sitting in the aircraft returned body height to pre-rest levels.

Conclusions:

High +Gz forces exert significant stress on the spinal column.
The occupation of a fighter pilot is physically demanding on the spine.
Acute height reduction underscores the biomechanical impact of G-forces.

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