Effects of Pulsed Electromagnetic Fields (PEMFS) On Cerebral Haemodynamics

Not Applicable

Terminated

• Conditions: Cognitive Change; Cerebral Hemodynamics
• Interventions: Device: Pulsed Electromagnetic Fields Therapy (Dominant leg); Device: Sham Therapy (Control); Device: Pulsed Electromagnetic Fields Therapy (Non-dominant leg)

• Registration Number: NCT03944993
• Lead Sponsor: National University Hospital, Singapore

Brief Summary

The investigators are looking to determine the effects of PEMFs device on cerebral blood flow and cognition in healthy volunteers. Through in vitro tests and in vivo animal studies, the investigators have shown that at an extremely low flux density (strength) of 1 millitesla (mT) and with short exposures of 10 minutes a week, PEMFs can recapitulate many of the healthful benefits of exercise without imparting a mechanical stress on the tissues and cells.

In the first-in-man study, 10 healthy volunteers were exposed to PEMFs for 6 weeks with 10 minutes of field exposure per week, and experienced an average increase of 30% in leg strength. No side effects were reported.

In this study, the investigators aim to understand the cerebral effects of an exercise mimetic (PEMFs) via the muscle milieu.

Detailed Description

Human and animal studies have reported the beneficial influence of exercise on cognitive and brain functions. Accordingly, exercise is drawing increasing research attention as a possible lifestyle factor for improving neurocognitive functions.

Low frequency and low amplitude Pulsed Electromagnetic Fields (PEMFs) recapitulate many of the benefits of exercise by activating many of the same cellular second messenger cascades activated by mechanical input (exercise) yet, without imparting a physical stress on the cells. Through a series of in vitro and in vivo experiments the investigators have shown that at field strengths of 1-2 mT amplitude, the PEMF system stimulates muscle without physically stressing the tissues and delivers the following benefits: 1) slows muscle loss, 2) improves muscle strength and, 3) releases important regenerative and metabolism-enhancing agents.

Functional near-infrared spectroscopy (fNIRS) is a relatively new optical imaging technology that uses light in the near-infrared spectrum to non-invasively monitor the haemodynamic responses evoked by neural activity through measuring the changes in oxyhaemoglobin (HbO) and deoxyhaemoglobin (HbR) concentrations in the cerebral cortex. The increased blood supply to the area of neural activation typically results in an increase in HbO concentration while a decrease is observed in HbR due to the blood's washout effect. The HbO and HbR responses from fNIRS measurements have been shown to be spatially and temporally correlated with the blood oxygen level-dependent signal obtained by fMRI. The advantage of fNIRS over other imaging modalities is that it is inexpensive, non-invasive, non-ionising and portable, making it a highly popular modality for implementing brain-computer interfaces. OBELAB NIRSIT is a commercially available, high-density fNIRS device that optically measures haemodynamic variations in the pre-frontal cortex (PFC).

Low-frequency and low amplitude pulsed electromagnetic fields (PEMFs) recapitulate many of the healthful benefits of exercise by activating many of the same cellular second messenger cascades activated by mechanical input (exercise) yet, without imparting a physical stress on the cells. Response windows are a largely unrecognised rule in mechanobiological systems, whereby cells are most responsive to a given strain, duration and frequency of stimulation; greater strain of higher frequency and duration of stimulation is too much of a stress for cells and results in null responses.

The investigators have shown that PEMFs likewise obey an electromagnetic window of efficacy with temporal and frequency dependencies of similar scale as those required for mechanical stimulation, further supporting the conclusion that PEMFs are activating cellular mechanotransduction pathways. At field strengths of 1-2 mT amplitude, the PEMF system stimulates muscle without physically stressing the tissues and aims to deliver the following benefits: 1) slows muscle loss; 2) improves muscle strength and; 3) releases important regenerative and metabolism-enhancing agents. Accordingly, this study will investigate the exercise mimetic effects of PEMFs on cerebral haemodynamics and cognitive performance via targeting muscle. The results of this study will support future work with patients with memory deficits, such as mild cognitive impairment, to possibly mitigate disease progression.

Study Timeline

• Status Verified: 2019-05
• Study First Submitted: 2019-05-03
• Study First Submitted QC: 2019-05-09
• Study First Posted: 2019-05-10
• Study Start: 2019-10-22
• Primary Completion: 2021-02-19
• Study Completion: 2021-02-19
• Last Update Submitted: 2021-06-28
• Last Update Posted: 2021-07-01

Recruitment & Eligibility

• Status: TERMINATED
• Sex: All
• Target Recruitment: 6

Inclusion Criteria

• Age between 21- 65 years
• Ability to provide informed consent

Exclusion Criteria

• Received any investigational drug or device within 30 days prior to study baseline visit or is enrolled in another clinical trial
• History of cardiac, neurological, or rheumatic diseases
• History of malignancy within the past 5 years
• Undergone surgery of any type within the past 6 months
• Anticipated need for surgery of any type during the next 3 months
• Previous treatment with the study device
• Metal implants in the lower limb
• Existing or planned pregnancy
• Lactating women
• Leg circumference > 63 cm
• Colour vision deficiency

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Pulsed Electromagnetic Field Therapy (Dominant leg)	Pulsed Electromagnetic Fields Therapy (Dominant leg)	Active Pulsed Electromagnetic Field therapy; exposed once weekly for 10 minutes on dominant leg.
Sham Therapy (Control)	Sham Therapy (Control)	Inactive Pulsed Electromagnetic Field therapy; exposed once weekly for 10 minutes.
Pulsed Electromagnetic Field Therapy (Non-dominant leg)	Pulsed Electromagnetic Fields Therapy (Non-dominant leg)	Active Pulsed Electromagnetic Field therapy; exposed once weekly for 10 minutes on non-dominant leg.

Primary Outcome Measures

Name	Time	Method
Change in cerebral haemodynamic responses	Baseline and Week 7	The frontal lobe activity of the participants will be measured pre- and post-PEMF stimulation. We will then use the modified Beer-Lambert law (MBLL) to extract haemodynamics data from that signal after applying filtering to reject noise. Haemodynamics data of the three treatment groups will be incorporated into regression analysis. The amplitude of the signal will be further normalised by dividing the averaged values by the standard deviation during the first 10 seconds before task onset. The coordinates of the head landmarks and probe positions will be used to estimate the centroid position of each channel in the Montreal Neurological Institute standard brain space. We will calculate the Area Under Curve (AUC) of the waveform of averages and normalised HbO and HbR during the task. The AUC values of the fNIRS signals between pre- and post-PEMF stimulation in the PFC will be compared by paired t-tests to confirm changes.
Change in cognitive performance	Baseline and Week 7	To determine any cognitive improvement as a result of PEMF from baseline using Stroop task.

Secondary Outcome Measures

Name	Time	Method
Quadriceps muscle strength	Baseline and Week 7	To determine the extent leg dominancy affects PEMF response in muscles i.e. percentage increase in quadriceps strength compared to baseline.
Thigh girth	Baseline and Week 7	To determine the extent leg dominancy affects PEMF response in muscle, we will measure participants' thigh girth (cm) 5 cm above from the superior border of the patella.

Trial Locations

Locations (1)

National University Hospital; 🇸🇬 Singapore, Singapore