Effects of nefopam on visual tracking

Area of Science:

• Pharmacology
• Neuroscience
• Human Performance

Background:

• Sleep deprivation impairs cognitive and motor functions.
• Understanding drug effects on performance is crucial for safety and efficacy.
• Investigating psychostimulants and analgesics in altered physiological states.

Purpose of the Study:

• To evaluate the impact of nefopam, d-amphetamine, and pentazocine on hand-eye coordination.
• To assess subjective effects of these drugs in sleep-deprived healthy males.
• To compare drug-induced changes in performance against placebo.

Main Methods:

• A critical tracking task assessed hand-eye coordination.
• Healthy male volunteers participated after sleep deprivation.
• Two doses of nefopam, d-amphetamine, and pentazocine were administered, along with a placebo.

Main Results:

• D-amphetamine (10 mg orally) enhanced tracking performance and subjective alertness, but increased anxiety.
• Pentazocine (45 mg intramuscularly) significantly impaired tracking performance and induced negative subjective effects like depression and nausea.
• Nefopam (2 doses) and placebo did not produce significant changes in coordination or subjective experience.

Conclusions:

• D-amphetamine demonstrates performance-enhancing and mood-altering effects in sleep-deprived individuals.
• Pentazocine impairs psychomotor function and elicits undesirable side effects.
• Nefopam does not appear to significantly affect hand-eye coordination or subjective states under these conditions.