The Effects of Transcranial Direct Current Stimulation in Mild Cognitive Impairment

Not Applicable

Completed

• Conditions: Mild Cognitive Impairment
• Interventions: Device: tDCS

• Registration Number: NCT03441152
• Lead Sponsor: The Hong Kong Polytechnic University

Brief Summary

Objectives: 1) To examine whether the real transcranial direct current stimulation (tDCS) group would perform better in the cognitive training (CT) intervention than the sham tDCS group and the CT group; 2) To determine if, as a consequence of the stimulation generated by the use of tDCS, there would be a transfer effect to other cognitive domains and to cognitive tasks in activities of daily living; 3) To investigate the time and spatial responses of tDCS on the brain cortex during and after tDCS application.

Hypothesis to be tested: By applying anodal tDCS with the combination of a CT delivered via the use of tablet PCs in older adults at risk of MCI, it will enhance their cognitive task performance in CT and subsequently generalize to other cognitive domains as well, involving a transferability to cognitive tasks in activities of daily living.

Design and subjects: A multi-centered single-blinded randomized controlled trial (RCT) with three groups (CT alone/Sham tDCS with the combination of a CT/ Real tDCS coupling with CT) The participants who will take part of this study will be older adults at risk of MCI Study instruments: tDCS, Ipad, Neuron Up CT Apps, EEG. Interventions: The intervention will last for 9 sessions (3 sessions per week for 3 weeks). Sham tDCS and real tDCS, will be combined with the same CT which is used in the CT group. During the experimental intervention, anodal tDCS will be placed on left dorsolateral prefrontal cortex (DLPFC) and cathodal tDCS on the contralateral deltoid muscle with the combination of a CT. During the experimental intervention, anodal tDCS will be placed on left dorsolateral prefrontal cortex (DLPFC) and cathodal tDCS on the contralateral deltoid muscle with the combination of a CT.

Main outcome measures: Cognitive assessments, CT performance, EEG. In addition, delta and theta frequency suppression and alpha increment power under the anode electrode will be observed.

Detailed Description

Not available

Study Timeline

• Study Start: 2017-07-01
• Study First Submitted: 2018-02-05
• Study First Submitted QC: 2018-02-20
• Study First Posted: 2018-02-22
• Primary Completion: 2018-08-30
• Study Completion: 2018-08-30
• Status Verified: 2023-01
• Last Update Submitted: 2023-01-31
• Last Update Posted: 2023-02-02

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 66

Inclusion Criteria

• The inclusion criteria will follow the modified Petersen's criteria:

  1. Aged between 60 and 85 years old;

  2. Obtaining a score on the Montreal Cognitive Assessment Test (MoCA) between 19 and 26;

  3. Achieving a score on the Clinical Dementia Rating (CDR) of 0.5 or below ;

  4. Self-reported cognitive decline by the participants themselves and

  5. Being independent in daily living activities.

     Additional criteria in this study include:

  6. Having completed three or more years of primary education;

  7. Ability to participate in a therapy session lasting at least 30 minutes;

  8. Community ambulant with or without aids; and

  9. Ability to perform a proper range of motion with hands in order to use a tablet PC.

Exclusion Criteria

• 1. Individuals presenting with a diagnosis of dementia or any other neurological disease; (2) Individuals with depression determined by a score on Geriatric Depression Scale of >5, (3) History of drug or alcohol abuse or dependence in the last 3 months; and (4) Participants who had metallic fixtures around the cephalic area or skin lesions in the areas at where the electrodes were going to be attached were excluded from the study.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
tDCS+CT	tDCS	application of tDCS in combination with CT
Sham tDCS	tDCS	application of sham tDCS in combination with CT
CT	tDCS	application of CT

Primary Outcome Measures

Name	Time	Method
Digit Span Test	10 minutes	The test measures short term memory in such a way that sequences of digits are presented and have to be recalled in forward and reverse order. Testing ends when the maximal list length is reached or when subjects fail to recall the trial at one sequence length.
Trial Making Test (TMT)	5 minutes	TMT encompasses visual attention and processing speed, it consists of 2 parts in which a set of 25 dots in the first part and 24 dots in the second part have to be accurately connected. Time performance is measured as the main outcome
Montreal Cognitive Assessment (MoCA)	10 minutes	It is a 30-point test about several cognitive domains (visuospatial/executive, naming, memory, attention, language, abstraction, delayed recall and orientation) and a screening tool used of MCI and dementia.

Secondary Outcome Measures

Name	Time	Method
Riverhead Behavioral Memory Test (3rd edition) (RBMT-3)	40 minutes	It includes 14 subtests assessing aspects of visual, verbal, recall, recognition, immediate and delayed everyday memory. Additionally prospective memory skills and the ability to learn new information are measured as well

Trial Locations

Locations (1)

The Hong Kong Polytechnic University; 🇭🇰 Hong Kong, Hong Kong