blood-flow-restriction-pd-balance-nct06508801

Blood Flow Restriction for Optimizing Balance in Parkinson's Disease

Overview

This clinical trial investigates the effects of blood flow restriction (BFR) combined with instability resistance training (IRT) on balance, mobility, and motor function in patients with Parkinson's disease (PD). The study aims to determine whether low-intensity resistance exercises with BFR are well-tolerated and effective for improving muscle strength, balance, and physical function in individuals with PD.

Blood flow restriction training involves applying a pneumatic cuff to the proximal thighs during exercise, partially restricting arterial inflow while completely occluding venous outflow. This technique allows for muscle strength gains at significantly lower loads (20-30% of 1RM) compared to traditional resistance training, making it particularly suitable for patients who cannot tolerate high-intensity exercise.

Trial Details

Blood Flow Restriction for Optimizing Balance in Parkinson's Disease

Overview

This clinical trial investigates the effects of blood flow restriction (BFR) combined with instability resistance training (IRT) on balance, mobility, and motor function in patients with Parkinson's disease (PD). The study aims to determine whether low-intensity resistance exercises with BFR are well-tolerated and effective for improving muscle strength, balance, and physical function in individuals with PD.

Blood flow restriction training involves applying a pneumatic cuff to the proximal thighs during exercise, partially restricting arterial inflow while completely occluding venous outflow. This technique allows for muscle strength gains at significantly lower loads (20-30% of 1RM) compared to traditional resistance training, making it particularly suitable for patients who cannot tolerate high-intensity exercise.

Trial Details

| Parameter | Value |
|-----------|-------|
| NCT Number | NCT06508801 |
| Status | Recruiting |
| Phase | Not Applicable (Feasibility) |
| Sponsor | The University of Texas Health Science Center at San Antonio |
| Principal Investigator | Anjali Sivaramakrishnan, PhD, PT |
| Collaborators | National Institute on Aging (NIA) |
| Intervention | Blood Flow Restriction + Instability Resistance Training |
| Enrollment | 20 participants (estimated) |
| Start Date | January 7, 2025 |
| Primary Completion | December 2026 |
| Completion Date | December 2026 |
| Location | San Antonio, Texas, United States |

Study Design

Rationale

Parkinson's disease is a progressive neurodegenerative disorder affecting the dopaminergic neurons in the substantia nigra pars compacta. Motor symptoms include tremor, rigidity, bradykinesia, and postural instability. Postural instability is particularly disabling as it leads to falls, reduced mobility, and decreased quality of life.

Traditional high-intensity resistance training can be challenging for PD patients due to:

• Reduced exercise tolerance
• Fatigue during extended exercise sessions
• Risk of orthostatic hypotension
• Balance deficits that make heavy lifting unsafe

• Inducing muscle hypertrophy and strength gains at low loads
• Activating fast-twitch muscle fibers normally recruited only at high loads
• Stimulating hormonal and metabolic responses comparable to high-intensity exercise
• Reducing the mechanical stress on joints and supporting structures

Intervention Protocol

BFR plus IRT Group:

• Blood flow restriction training combined with instability resistance training
• 2 sessions per week for 6 weeks
• BFR at 20-30% of 10 repetition maximum (10RM)
• Exercises: toe raises, lunges, single leg stance on unstable surfaces

• Instability resistance training without blood flow restriction
• 2 sessions per week for 6 weeks
• Same exercises on unstable surfaces

Unstable Training Devices

The trial utilizes progressive instability devices:

Progression occurs as participants demonstrate reduced body sway on each device.

Mechanism of Action

Blood Flow Restriction Physiology

Blood flow restriction works through several mechanisms:

Instability Training Benefits

Instability resistance training targets:

• Postural control and equilibrium
• Core stability
• Proprioceptive feedback
• Adaptive muscle activation patterns
• Balance reactions and compensatory strategies

Outcome Measures

Primary Outcomes

| Measure | Description |
|---------|-------------|
| Feasibility Metric | Dropout and adverse event rate <20% (acceptable if ≤2/10 participants) |

Secondary Outcomes

| Measure | Timepoint | Description |
|---------|-----------|-------------|
| miniBESTest | Baseline to 14 weeks | Balance evaluation (0-28 points, 14 items scored 0-2) |
| 30-second Chair Stand | Baseline to 14 weeks | Functional mobility - stands from sitting in 30 seconds |
| MDS-UPDRS Part III | Baseline to 14 weeks | Motor severity (0-72 points, 18 items) |
| Postural Sway (BioSway) | Baseline to 14 weeks | Postural stability on Biodex BioSway |
| Spinal Excitability | Baseline to 14 weeks | H-reflex recruitment curves |
| Hip Abductor Strength | Baseline to 14 weeks | Isokinetic dynamometry |
| Knee Extensor Strength | Baseline to 14 weeks | Isokinetic dynamometry |
| Ankle Plantar Flexor Strength | Baseline to 14 weeks | Isokinetic dynamometry |
| PDQ-39 | Baseline to 14 weeks | Quality of life (0-100, lower = better) |

Eligibility Criteria

Inclusion Criteria

Exclusion Criteria

Scientific Rationale

Parkinson's Disease and Postural Instability

Postural instability in PD results from:

• Degeneration of dopaminergic neurons in the substantia nigra
• Dysfunction of the basal ganglia-thalamocortical circuits
• Impaired integration of sensory information for balance
• Reduced automaticity of postural responses

• BFR improves muscle strength, which supports postural control
• Instability training specifically targets balance mechanisms
• Low-intensity approach is safer for fall-prone patients
• Both interventions are time-efficient (45-minute sessions)

Spinal Excitability Assessment

The trial includes peripheral nerve stimulation to measure spinal excitability via H-reflex. This addresses whether BFR affects the monosynaptic reflex arc, which is relevant because:

• H-reflex is modulated by descending dopaminergic pathways
• PD patients may show altered H-reflex characteristics
• Changes could indicate disease modification beyond strength gains

References

Related Pages

• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Transcranial Direct Current Stimulation for PD Gait](/clinical-trials/tdcs-pd-gait-nct06324448)
• [tDCS for Motor Function in PSP](/clinical-trials/tdcs-motor-function-psp-nct07291687)
• [Physical Therapy Modalities](/rehabilitation/physical-therapy-parkinsons)

Related Hypotheses

From the [SciDEX Exchange](/exchange) — scored by multi-agent debate

• [Synthetic Biology BBB Endothelial Cell Reprogramming](/hypothesis/h-84808267) — <span style="color:#81c784;font-weight:600">0.71</span> · Target: TFR1, LRP1, CAV1, ABCB1
• [Glymphatic System-Enhanced Antibody Clearance Reversal](/hypothesis/h-62e56eb9) — <span style="color:#81c784;font-weight:600">0.66</span> · Target: AQP4
• [Dual-Domain Antibodies with Engineered Fc-FcRn Affinity Modulation](/hypothesis/h-23a3cc07) — <span style="color:#ffd54f;font-weight:600">0.58</span> · Target: FCGRT
• [Circadian-Synchronized LRP1 Pathway Activation](/hypothesis/h-7e0b5ade) — <span style="color:#ffd54f;font-weight:600">0.57</span> · Target: LRP1, MTNR1A, MTNR1B
• [Engineered Apolipoprotein E4-Neutralizing Shuttle Peptides](/hypothesis/h-b948c32c) — <span style="color:#ffd54f;font-weight:600">0.55</span> · Target: APOE, LRP1, LDLR
• [Magnetosonic-Triggered Transferrin Receptor Clustering](/hypothesis/h-aa2d317c) — <span style="color:#ffd54f;font-weight:600">0.52</span> · Target: TFR1
• [Piezoelectric Nanochannel BBB Disruption](/hypothesis/h-7a8d7379) — <span style="color:#ff8a65;font-weight:600">0.40</span> · Target: CLDN5, OCLN

Related Analyses:

• [Blood-brain barrier transport mechanisms for antibody therapeutics](/analysis/SDA-2026-04-01-gap-008) &#x1f504;