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Sleepiness and the reinforcing and subjective effects of methylphenidate
T Roehrs1, K Papineau, L Rosenthal
1Sleep Disorders and Research Center, Henry Ford Hospital, Detroit, Michigan 48202, USA. taroehrs@aol.com
Abstract:
On 4 days, 6 volunteers received 10 mg methylphenidate or placebo at 0900 after 4 or 8 hr time in bed (TIB) and then on 4 days after 4 or 8 hr TIB chose their preferred capsule. On sampling days, 4 hr TIB increased multiple sleep latency test (MSLT) scores and Fatigue scale scores on the Profile of Mood States (POMS). In both TIBs, the drug increased the MSLT and POMS Vigor and Tension scale scores. It reduced POMS Fatigue scores and improved divided attention performance to a greater extent after 4 versus 8 hr. Drug was chosen on 88% of days after 4 hr, but only 29% of days after 8 hr. Preference for the drug depends on sleepiness and is mediated by performance-enhancing and fatigue-altering effects.
Insights
Methylphenidate improved alertness and cognitive function, especially after shorter sleep durations. Volunteers preferred the stimulant more following 4 hours of time in bed (TIB) compared to 8 hours.
Area of Science:
- Neuroscience
- Sleep Medicine
- Pharmacology
Background:
- Sleep deprivation significantly impacts cognitive function and mood.
- Stimulant medications like methylphenidate are used to counteract effects of sleepiness.
- Understanding the dose-response and time-dependent effects of methylphenidate is crucial for optimizing its use.
Purpose of the Study:
- To investigate the effects of methylphenidate on sleepiness, cognitive performance, and mood.
- To determine how time in bed (TIB) duration influences the efficacy and subjective preference for methylphenidate.
- To explore the relationship between performance enhancement, fatigue reduction, and drug preference.
Main Methods:
- Six volunteers participated in a controlled study.
- Participants received either 10 mg methylphenidate or placebo after 4 or 8 hours of time in bed (TIB).
- Multiple Sleep Latency Test (MSLT), Profile of Mood States (POMS) questionnaire, and divided attention tasks were administered.
Main Results:
- Four hours of TIB increased MSLT and POMS Fatigue scores compared to 8 hours TIB.
- Methylphenidate increased MSLT, POMS Vigor, and Tension scores in both TIB conditions.
- The drug's benefits on POMS Fatigue scores and divided attention were more pronounced after 4 hours TIB than 8 hours TIB.
Conclusions:
- Methylphenidate effectively reduces sleepiness and improves cognitive performance.
- The subjective preference for methylphenidate is strongly influenced by the degree of sleepiness and is greater after shorter sleep durations.
- Performance-enhancing and fatigue-altering effects mediate the preference for methylphenidate, highlighting the importance of TIB in its perceived efficacy.