Isometric force production in experienced fighter pilots during +3 Gz centrifuge acceleration.
BACKGROUND
Previously, we have shown that naïve subjects produce exaggerated isometric forces when exposed to increased acceleration (+Gz) for the first time. The present study investigates whether +G,-experienced PA-200 Tornado pilots show similar deficits.


METHODS
Experiments were conducted in the stationary (+1 Gz) or rotating (+3 Gz) gondola of a human-rated centrifuge. With their dominant hand, seven pilots produced visually prescribed forces of specific direction and magnitude using an isometric joystick. In practice trials, subjects received continuous visual feedback about their performance, while in test trials they did not.


RESULTS
Peak forces during test trials were significantly higher in +3 Gz than in +1 Gz, although this increase of about 25% referring to the +1 Gz value was somewhat smaller in pilots than in nonpilot controls (increase of about 36%).


CONCLUSIONS
Since pilots' responses were exaggerated in +3 Gz, it seems that frequent exposure to varying +Gz levels is not sufficient for a profound adaptation of force-producing mechanisms to +3 Gz. In consequence, pilots' performance on isometric tasks could be compromised during flight maneuvers in +Gz.
Guardiera
Simon
S
Department of Physiology and Anatomy, German Sport University Cologne, Cologne, Germany. guardiera@dshs-koeln.de
Bock
Otmar
O
Pongratz
Hans
H
Krause
Wolfgang
W
D000054:Acceleration; D000401:Aircraft; D002498:Centrifugation; D005858:Germany; D006801:Humans; D018471:Hypergravity; D007537:Isometric Contraction / Q000502:physiology*; D008887:Military Medicine; D008889:Military Personnel; D010865:Pilot Projects