The Influence of Energy Drinks on the Blood Oxygenation Concentration of the Optic Nerve

Early Phase 1

• Conditions: Healthy
• Interventions: Drug: Redbull, energy drink

• Registration Number: NCT01827150
• Lead Sponsor: Université de Montréal

Brief Summary

The present proposal investigates the influence of energy drinks on the blood oxygenation concentration of the optic nerve on healthy subjects. On a voluntary basis, 15 subjects, man or woman, will be selected to undergo this experiment. Many factors can influence the blood oxygenation concentration of the optic nerve, which will be measured also during this experiment, namely: Intra ocular pressure (IOP), blood pressure, heart rate and systemic hemoglobin saturation.

The subjects will have to be tested twice to test the two conditions of this experiment:

1. The effect after the intake of a can of Redbull (250 ml)

2. The difference with the intake of 250 ml of water

The purpose of this study is to determine if the blood oxygenation concentration of the optic nerve varies after having ingested 250 ml of Redbull.

Our hypothesis are:

1. The blood oxygenation concentration of the optic nerve measured with OSOME (see detailed description below), decreases due to the consumption of the energy drink Redbull compared to an equal volume of water.

2. The IOP measured with iCare tonometer decreases after the consumption of the energy drink Redbull compared to an equal volume of water.

3. The systemic blood pressure, measured with an automatic sphygmomanometer remains constant after ingestion of Redbull energy drink or an equal volume of water.

4. Heart rate, measured with a sphygmomanometer automatic increases after taking a Redbull energy drink compared to an equal volume of water.

5. The rate of systemic hemoglobin saturation measured with a pulse oximeter remains constant after the ingestion of a Redbull energy drink or an equal volume of water.

Detailed Description

The blood oxygenation will be assessed using a machine called the OSOME. The online spectroreflectometry oxygenation measurement in the eye (OSOME) was used to measure eye fundus oxygenation, more precisely optic nerve head capillaries structures oxygenation, by full spectrum reflectometry (1020 wavelength from 400 to 700nm) in real time (O.S.O.M.E., Faubert \& Diaconu US patent # 5,919,132) with 2% accuracy. It includes a fundus camera (Topcon, Osaka, Japan) coupled with a digital video camera (USB) and a detection unit composed of a multi-channel spectrograph and a charged coupled device (CCD).

In order to use this machine, upon arrival, the patient's right eye needs to be dilated with drops of proparacaine hydrochloride 0.5%, tropicamide 1% and phenylephrine hydrochloride 2.5%. The patient is required to rest for 20 minutes to allow a complete dilatation of the pupil before using the OSOME.

Study Timeline

• Status Verified: 2013-04
• Study First Submitted: 2013-04-02
• Study First Submitted QC: 2013-04-08
• Study First Posted: 2013-04-09
• Study Start: 2013-06
• Last Update Submitted: 2013-07-22
• Last Update Posted: 2013-07-23
• Primary Completion: 2013-12
• Study Completion: 2014-04

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 15

Inclusion Criteria

• Be a man or a woman in good general health
• Be a non-smoker
• Weigh between 45 kg and 80 kg
• Have an intra ocular pressure inferior to 22 mm Hg
• Have a blood pressure inferior to 120/80 mm Hg
• Absence of systemic diseases (including hypertension, diabetes, or vascular disease),
• Absence of any ocular disease
• Evidence of abstinence from caffeine or caffeine beverages 48 hours prior to the experiment
• Abstinence from use of any systemic drugs and/or alcohol

Exclusion Criteria

• Any subject who has family or personal history of glaucoma will be excluded
• All the subjects who didn't respect the inclusion criteria

There is no monetary compensation for participating in this study.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Redbull, optic nerve	Redbull, energy drink	15 subjects will each be drinking a can of Redbull (250 ml) and an equal amount of water (250 ml) in two different sessions. The order in which they will do so, is determined by randomization. Intervention: Drug: Redbull, energy drink

Primary Outcome Measures

Name	Time	Method
Pupillary dilation	T=-30 minutes	Upon arrival, the patient's right eye needs to be dilated with one drop of proparacaine hydrochloride 0.5%, one drop of tropicamide 1% and one drop of phenylephrine hydrochloride 2.5%. The patient is required to rest for 20 minutes to allow a complete dilatation of the pupil.
Baseline measurement before the ingestion of either Redbull or an equal amount of water	T=-10 minutes	Baseline measurement of the blood oxygenation concentration of the optic nerve, the IOP, the heart rate, the blood pressure and the rate of systemic hemoglobin saturation.
Ingestion of Redbull/Water	T=0 minutes	Ingestion of 250 ml of the energy drink Redbull or an equal amount of water
Measurement of major variables	T= 15, 30, 45, 60 minutes	After having ingested 250 ml of Redbull or an equal volume of water, the blood oxygenation concentration of the optic nerve, the IOP and the heart rate will be measured every 15 minutes for a total of 60 minutes.
Measurement of minor variables	T=30, 60 minutes	The blood pressure and rate of systemic hemoglobin saturation will be measured every 30 minutes for a total of 60 minutes after the ingestion of 250 ml of the energy drink Redbull or an equal amount of water.

Trial Locations

Locations (1)

École d'optométrie de l'Université de Montréal; 🇨🇦 Montréal, Quebec, Canada