Aircraft control forces and EMG activity: comparison of novice and experienced pilots during simulated take-off and landing.
BACKGROUND
Flying an aircraft requires a considerable degree of coordination, particularly during activities such as takeoff and landing. No studies have examined the magnitude and phasing of muscle activity required to fly an aircraft. The aim of this study was to examine the muscle activation patterns and control forces of novice and experienced pilots during simulated flight.


METHODS
Twelve experienced and nine novice pilots were tested on an Aermacchi flight simulator while performing a randomized set of take-off and landing maneuvers. Four different runaway trim settings were used to increase the difficulty of the landings (elevator-up, elevator-down, aileron-left, and aileron-right). Variables recorded included aircraft attitude, pilot applied forces, and electromyographic (EMG) activity. Discriminant function analysis was used to distinguish between novice and experienced pilots.


RESULTS
Across all landings, wrist flexors and wrist extensors were the predominant muscles used, with EMG activity consistently around 20-30% maximum voluntary contraction (MVC). In respect to differences in EMG activity between novice and experienced pilots, novices had significantly more activity in wrist extensors during all landings. In contrast, experienced pilots had consistently more vastus lateralis activity for all landings than did novice pilots. Over all landings and take-off, 89.5% of pilots were correctly classified as novice or experienced. When the maneuvers were analyzed individually, normal, elevator-down, and aileron-left landings were the most accurate maneuvers for pilot prediction. EMG and force variables were more important than aircraft attitude in discriminating between novice and experienced pilots (83%, 79%, and 65%, respectively).


CONCLUSIONS
The consistency of the finding that EMG activity and control forces are accurate discriminators of pilot experience is indicative of underlying differences in neuromuscular control strategies between novice and experienced pilots.
Hewson
D J
DJ
Aviation Medicine Unit, Royal New Zealand Air Force, Whenuapai, Auckland.
McNair
P J
PJ
Marshall
R N
RN
D000328:Adult; D000337:Aerospace Medicine; D000704:Analysis of Variance; D003198:Computer Simulation; D016002:Discriminant Analysis; D004576:Electromyography; D006801:Humans; D008297:Male; D008991:Monitoring, Physiologic; D009119:Muscle Contraction / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D011361:Professional Competence; D011597:Psychomotor Performance; D013848:Thigh / Q000502:physiology; D013997:Time Factors; D014953:Wrist / Q000502:physiology