Investigation of the effects of transcranial direct current stimulation and dark chocolate supplementation on athletic and cognitive performance in normobaric hypoxia after inducing mental fatigue in men cyclists

Determining the effects of electrical stimulation of the brain and dark chocolate on physiological and cognitive function and perceptual responses during and after debilitating endurance activity in hypoxia And mental fatigue

This research will have an intervention group and a control group, double-blind and randomized with a within-group design and counterbalancing. Latin square method and www.random.org site are used for randomization.

Hypoxia through the hypoxia device, mental fatigue with the Stroop test software, supplement (dark and white chocolate) and direct transcranial stimulation of the brain with the tDCS device. Razi University Faculty of Sports Science Laboratory.Subjects and the lead researcher will not be aware of the type of stimulation received in each session.

Inclusion criteria: Age range 18 to 44 years Active cyclist under the supervision of Kermanshah city cycling board Regular cycling training in the last six months at least three sessions a week Obtaining a certificate of non-prohibition from participating in an exercise program from a physician Being right-handed. Criteria for barring entry to the research: Climbing to an altitude of over 2000 meters in the past month Having any cardiovascular, pulmonary and metabolic diseases The presence of implantable or pacemaker devices in the body Tobacco and alcohol consumption

Intervention: It is a group that receives the interventions of anodal electrical stimulation, sham stimulation and dark chocolate. Control: the group that consumes white chocolate. Each subject will be randomly examined in four conditions.

Time to exhaustion; Electromyography; Rate of perceived exertion; Sense of pleasure; Arousal; Reaction time

In order to randomize the order of subjects' exposure to four different conditions, the Latin square method will be used. To do this, first using the site www.random.org, each subject will be randomly assigned a number between 1 and 12 as the identification code. Then, the English letters A, B, C, and D are assigned to the four intervention terms, and a Latin square with four rows and four columns is created. After creating the Latin square, participants 1 to 3 in the first row sequence, participants 4 to 6 in the second row sequence, participants 7 to 9 in the third row sequence, and participants 10 to 12 in the sequence Sequences will be placed in the fourth row.

The subjects and the researcher will not be aware of the type of stimulation received in each session and this information will be available only to someone outside the research team until the end of the research. In order to conceal the order of receiving the stimulus from the researcher, all the steps related to randomly determining the order of receiving the stimulus in each subject will be performed by the same person outside the research team. Also, in order to hide the type of stimulation in each session of the subjects, the tDCS device is hidden from the subjects by a cover and the researcher will not be present in the laboratory during the installation of the electrodes and at the end of 20 minutes and the time of electrode separation.

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