The effect of an energy drink containing glucose and caffeine on human corticospinal excitability
| Autor: | Paul H. Strutton, Annapoorna Kuppuswamy, M Catley, M Specterman, Nick J. Davey, A Bhuiya |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Adult
Blood Glucose Male medicine.medical_treatment Experimental and Cognitive Psychology Stimulation Electromyography Beverages Behavioral Neuroscience chemistry.chemical_compound Electromagnetic Fields Caffeine Healthy volunteers medicine Humans Ingestion Ulnar Nerve Cerebral Cortex medicine.diagnostic_test Motor Cortex Middle Aged Evoked Potentials Motor Electric Stimulation Transcranial magnetic stimulation Electrophysiology Glucose medicine.anatomical_structure Spinal Cord chemistry Anesthesia Central Nervous System Stimulants Female Psychology Motor cortex |
| Zdroj: | Physiology & Behavior. 83:723-728 |
| ISSN: | 0031-9384 |
| DOI: | 10.1016/j.physbeh.2004.09.008 |
| Popis: | Glucose- and caffeine-containing energy drinks are said to influence the cognitive and cellular function within the brain. In this study, we have used the size of motor-evoked potentials (MEPs) produced in response to transcranial magnetic stimulation (TMS) of the motor cortex as an index of corticospinal excitability after ingestion of Lucozade and control drinks of glucose-containing or caffeine-containing carbonated water or carbonated water alone. With local ethical approval and informed consent, 10 healthy volunteers took part; surface electromyographic (EMG) recordings were taken from the thenar muscles of the dominant hand. In each assessment, 15 TMS stimuli were delivered over the motor cortex at an intensity of 1.1 T. Six subjects ingested a 380-ml bottle of carbonated Lucozade drink containing 68 g of glucose and 46 mg caffeine. Four subjects took part in three control trials drinking: (A) carbonated water with caffeine, (B) carbonated water with glucose and (C) carbonated water alone. Assessments were made before and at 30-min intervals after each drink. Mean fasting blood glucose concentrations and mean areas of MEPs rose after the Lucozade, remaining elevated for 90 min. Similar rises in MEP areas were seen in trials after drinking carbonated water with caffeine or with glucose, but not after drinking carbonated water alone. No change was seen in the M-wave evoked by electrical stimulation of the ulnar nerve. We conclude that Lucozade can affect the size of MEPs to activation of the motor cortex with fixed-intensity TMS. The underlying mechanism is likely to relate to the combined effects of caffeine and glucose on the brain. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect