Asymptomatic Condition
Conditions
Keywords
Brain stimulation, tDCS, Fatigue, Rotator cuff
Brief summary
The aim of this study will be to determine the effects of active tDCS on rotator cuff fatigue. This study will be a randomized, double-blind, sham-controlled, cross-over clinical trial based on non-probabilistic sampling for convenience, comprising a sample of 20 active asymptomatic subjects of all genders and aged between 18 and 35 years old. Subjects will be recruited via social networks, WhatsApp and emails and must be currently engaged in moderate physical activity (assessed by the IPAQ questionnaire) and asymptomatic at the time of assessment. In addition, participants will be asked not to perform any type of strenuous exercise and do not drink alcoholic or caffeinated beverages during the time the work is performed. The study will consist of three sessions, with an interval of 72 hours between them.
Interventions
OTHERTranscranial Direct Current Stimulation
The direct electric current will be applied through a pair of sponges humidified with saline solution (150 mMols of NaCl diluted in water Milli-Q) on the electrodes (35 cm2). The electrodes (anode and cathode) will be connected to a continuous electric stimulator (Model: Microestim Foco Research, Brand: NKL, Souza Cruz, Brusque - SC, Brazil), with one energy battery (9 V) and will be mounted in accordance with the International 10-20 EEG System. For anodal polarity stimulation over the left TC, the anodal electrode will be placed over the scalp on the T3 area located at 40% of the distance on the left from the Cz point. The cathode electrode will be placed over the contralateral supraorbital area (Fp2). Thereafter, a constant electric current of 2 mA will be applied for 20 min.
Sponsors
University of Gran Rosario
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
OTHER
Masking
DOUBLE (Subject, Investigator)
Eligibility
Sex/Gender
ALL
Age
18 Years to 35 Years
Healthy volunteers
Yes
Inclusion criteria
* Age ranging between 18 to 35 years, all genders. * Healthy subjects * Moderate physical activity (evaluated by IPAQ questionnaire) * Do not perform any exhausting exercise and do not drink alcoholic or caffeinated beverages during the time the work is performed.
Exclusion criteria
* Subjects with trauma in the last three weeks or previous surgeries on the upper extremity, patients with pre-existing neurological or rheumatic conditions, pregnancy, medical history of epilepsy the convulsive event, subjects under analgesic drug treatment or have ingested drugs with central action in the last 72 hours.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change in Time to Exhaustion (TTE) | At baseline, after 3 and 6 days | To assess endurance performance, participants will perform a submaximal isometric time to exhaustion (TTE) task of the shoulder external rotator muscles at 50% of their maximal voluntary contraction (MVC), which will be performed during each visit. During the TTE each participant will receive visual feedback on a computer monitor showing the target force. The task will finish when their force is below the required target value for more than 3 s. None of the participants will be aware of the time elapsed during the test and results of all the sessions will be provided only after the completion of all visits. Participants' perception of effort will be measured using the RPE scale (Borg, 1998) every 20 s of the TTE task. Leg muscle pain will be assessed every 20 s by using the Numerical Pain Rating Scale (NPRS). |
| Change in Maximum Voluntary Contraction (MVC) | At baseline, after 3 and 6 days | After a brief standardized warm-up with submaximal isometric contractions, all participants will perform a 6 seconds MVC of infraspinatus muscle. For the MVC, subjects will be standing, with the shoulder in adduction position and the elbow flexed at 90°. The record will be evaluated by a load cell S200 (Miotec™, Porto Alegre, Brazil). The MVC produced during this test will be used to calculate the participants' 50% MVC used in the subsequent TTE task of that visit. |
| Change in Rating of Perceived Exertion (RPE) | At baseline, after 3 and 6 days | Borg rating of perceived exertion (RPE) is an outcome measure scale used in knowing exercise intensity prescription. The RPE will be evaluated using the BORG CR10 scale, its ranges are from 0 (no exertion) to 10 (maximum effort). The RPE will be evaluated using the BORG CR10 scale, its ranges are from 0 (no effort) to 10 (maximum effort). The perception of the effort of the participants will be measured every 20 s during the TTE task. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Change in Global Rating of Change Scale (GRCS) | After 3 and 6 days | For the Global Rating of Change Scale, in the second and third visit, subjects will be asked about their perception of change in relation to the endurance task relative to their status at the first visit. |
| Change in Electromyographic recordings (sEMG) | At baseline, after 3 and 6 days | Surface electromyography (sEMG) assessment will be performed on the infraspinatus and deltoid muscles, using an acquisition module with four analog channels (Miotec™, Biomedical Equipments, Porto Alegre, Brazil). The conversion from analog to digital signals will be performed by an A/D board with 16-bit resolution input range, sampling frequency of 2 kHz, common rejection module greater than 100 dB, signal-noise ratio less than 03 μV Root Mean Square and impedance of 109 Ω. The sEMG signals will be recorded through surface Ag/AgCl electrodes (Meditrace™, Canada) with a centre-to-centre distance of 2 centimeters, in a parallel orientation to the underlying muscle fibers. A ground electrode will be placed in the lateral epicondyle of the contralateral arm The skin will be shaved and cleaned using alcohol swabs, following standardized guidelines. A fatigue study will be carried out using a frequency analysis. |
Countries
Argentina
Outcome results
None listed