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Date of Award

Summer 2024

Document Type

Masters Thesis

Department or Program Affiliation

Kinesiology - Exercise Science

Degree Name

Master of Science (MS)

Department

Health and Human Development

First Advisor

San Juan, Jun G.

Second Advisor

Jantzen, Kelly J.

Third Advisor

Suprak, David N. (David Nathan)

Abstract

Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation method that is thought to improve performance, but its effects remain unclear. The purpose of this study was to evaluate the effects of tDCS on the performance of vertical jump height, time to exhaustion, and maximal strength output using the Halo Sport tDCS device. It was hypothesized that anodal tDCS of the leg area of the motor cortex would significantly increase vertical jump height, maximal strength output, time to exhaustion (TTE), and electromyographic (EMG) activity. Countermovement jump (CMJ) height, peak torque of the knee extensor, TTE, and electromyographic (EMG) activity of the Vastus Medialis muscle were measured before and after receiving tDCS. Twenty-eight healthy college-aged individuals participated in this study (age 22.03 ± 2.23). Each participant was randomly assigned to a hand (n=9), leg (n=9), and sham (n=10) stimulation group. The stimulation duration was set to 20 minutes. The stimulation intensity for the leg and hand stimulation group were 2.07 and 2.03 mA, respectively. A two-way mixed ANOVA was used to assess the interaction between tDCS and time. There was no interaction of tDCS on CMJ height and, peak knee torque. There was an interaction of tDCS on EMG activity (p = 0.047, = 0.217) and TTE (p = 0.18, = 0.275). Post hoc testing for the interaction of EMG and TTE did not show significance among groups. It can be concluded tDCS significantly affects EMG and TTE, however, there was no significance between stimulation groups.

Type

Text

Keywords

tDCS, Halo sport, Performance, Time to exhaustion, Maximal strength output, Vertical jump height, EMG

Publisher

Western Washington University

OCLC Number

1456569941

Subject – LCSH

Brain stimulation--Therapeutic use; Sports--Physiological aspects; Physical fitness; Fatigue; Isometric exercise

Format

application/pdf

Genre/Form

masters theses

Language

English

Rights

Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this document for commercial purposes, or for financial gain, shall not be allowed without the author’s written permission.

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