Effect of Limb Occlusion Pressure Attainment on Cardiovascular, Perceptual, and Performance Responses

NCT ID: NCT06718582

Last Updated: 2025-10-10

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 27 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2025-02-01
• Study Completion Date: 2025-04-15

Brief Summary

To test the effect of limb occlusion pressure attainment in the supine, seated, and standing position on exercise performance, vascular physiology, and muscle.

Detailed Description

The purpose of this study is to investigate the attainment of limb occlusion pressure (LOP)in the supine, seated, and standing positions on indices of arterial stiffness, muscle morphology, participant perception, and performance responses. Thirty adults aged 18-40 will undergo four treatment sessions (control (no BFR), supine LOP, seated LOP, and standing LOP) in a randomized order separated by one week. A familiarization session will also occur one week before starting the treatment period. Each subject will undergo a series of tests including anthropometry, ultrasonography of the carotid artery, applanation tonometry, ultrasonography of the vastus lateralis, blood pressure acquisition, body composition, and maximal strength assessments (1RM). All sessions will consist of four sets of dumbbell wall squats performed to failure with a 2-seconds concentric and 2-seconds eccentric cadence, at 20% of their 1RM using 60% of the LOP with 1-minute rest intervals. In the supine LOP session, the BFR cuffs will be pressurized to 60% of the supine LOP. In the seated LOP session, the BFR cuffs will be pressurized to 60% of the seated LOP. And, in the standing LOP session, the BFR cuffs will be pressurized to 60% of the standing LOP. Assessments will be performed immediately before and after the exercise bout during each treatment session. Two-way ANOVAs will be used to examine the main effects of treatment and treatment-order interaction on pulse wave velocity, muscle cross-sectional area, perceptual responses, and exercise performance.

Conditions

Blood Flow Restriction (BFR) Training Effects; Arterial Stiffness, Blood Pressure; Muscle Morphology; Perceptions

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: CROSSOVER
• Primary Study Purpose: BASIC_SCIENCE
• Blinding Strategy: NONE

Study Groups

Supine Limb Occlusion Pressure

In the supine LOP session, the BFR cuffs will be pressurized to 60% of the supine LOP. After inflation of the BFR cuffs, four sets of dumbbell wall squats will be performed to failure with a 2-seconds concentric and 2-seconds eccentric cadence, at 20% of their 1RM using 60% of the LOP with 1-minute rest intervals.

Group Type: EXPERIMENTAL

Delfi Training Device

Intervention Type: DEVICE

Delfi (Vancouver, Canada) training devices will be used for exercise and testing sessions. Cuffs will be placed around the right and left proximal thigh. The LOP will be set at 60% immediately before exercise and will be applied during the entire exercise set (approximately 30-60 seconds in duration) following manufacturer specifications. In the supine LOP session, the BFR cuffs will be pressurized to 60% of the supine LOP. In the seated LOP session, the BFR cuffs will be pressurized to 60% of the seated LOP. And, in the standing LOP session, the BFR cuffs will be pressurized to 60% of the standing LOP. The cuffs will maintain pressure during training and rest periods. The LOP will be reduced to 0% immediately after completing the last set.

Seated Limb Occlusion Pressure

In the seated LOP session, the BFR cuffs will be pressurized to 60% of the seated LOP. After inflation of the BFR cuffs, four sets of dumbbell wall squats will be performed to failure with a 2-seconds concentric and 2-seconds eccentric cadence, at 20% of their 1RM using 60% of the LOP with 1-minute rest intervals.

Group Type: EXPERIMENTAL

Delfi Training Device

Intervention Type: DEVICE

Delfi (Vancouver, Canada) training devices will be used for exercise and testing sessions. Cuffs will be placed around the right and left proximal thigh. The LOP will be set at 60% immediately before exercise and will be applied during the entire exercise set (approximately 30-60 seconds in duration) following manufacturer specifications. In the supine LOP session, the BFR cuffs will be pressurized to 60% of the supine LOP. In the seated LOP session, the BFR cuffs will be pressurized to 60% of the seated LOP. And, in the standing LOP session, the BFR cuffs will be pressurized to 60% of the standing LOP. The cuffs will maintain pressure during training and rest periods. The LOP will be reduced to 0% immediately after completing the last set.

Standing Limb Occlusion Pressure

In the standing LOP session, the BFR cuffs will be pressurized to 60% of the standing LOP. After inflation of the BFR cuffs, four sets of dumbbell wall squats will be performed to failure with a 2-seconds concentric and 2-seconds eccentric cadence, at 20% of their 1RM using 60% of the LOP with 1-minute rest intervals.

Group Type: EXPERIMENTAL

Delfi Training Device

Intervention Type: DEVICE

Delfi (Vancouver, Canada) training devices will be used for exercise and testing sessions. Cuffs will be placed around the right and left proximal thigh. The LOP will be set at 60% immediately before exercise and will be applied during the entire exercise set (approximately 30-60 seconds in duration) following manufacturer specifications. In the supine LOP session, the BFR cuffs will be pressurized to 60% of the supine LOP. In the seated LOP session, the BFR cuffs will be pressurized to 60% of the seated LOP. And, in the standing LOP session, the BFR cuffs will be pressurized to 60% of the standing LOP. The cuffs will maintain pressure during training and rest periods. The LOP will be reduced to 0% immediately after completing the last set.

No BFR cuff

Four sets of dumbbell wall squats will be performed to failure with a 2-seconds concentric and 2-seconds eccentric cadence, at 20% of their 1RM using 60% of the LOP with 1-minute rest intervals with no BFR cuffs

Group Type: PLACEBO_COMPARATOR

Delfi Training Device

Intervention Type: DEVICE

Delfi (Vancouver, Canada) training devices will be used for exercise and testing sessions. Cuffs will be placed around the right and left proximal thigh. The LOP will be set at 60% immediately before exercise and will be applied during the entire exercise set (approximately 30-60 seconds in duration) following manufacturer specifications. In the supine LOP session, the BFR cuffs will be pressurized to 60% of the supine LOP. In the seated LOP session, the BFR cuffs will be pressurized to 60% of the seated LOP. And, in the standing LOP session, the BFR cuffs will be pressurized to 60% of the standing LOP. The cuffs will maintain pressure during training and rest periods. The LOP will be reduced to 0% immediately after completing the last set.

Interventions

Delfi Training Device

Delfi (Vancouver, Canada) training devices will be used for exercise and testing sessions. Cuffs will be placed around the right and left proximal thigh. The LOP will be set at 60% immediately before exercise and will be applied during the entire exercise set (approximately 30-60 seconds in duration) following manufacturer specifications. In the supine LOP session, the BFR cuffs will be pressurized to 60% of the supine LOP. In the seated LOP session, the BFR cuffs will be pressurized to 60% of the seated LOP. And, in the standing LOP session, the BFR cuffs will be pressurized to 60% of the standing LOP. The cuffs will maintain pressure during training and rest periods. The LOP will be reduced to 0% immediately after completing the last set.

Intervention Type: DEVICE

Eligibility Criteria

Inclusion Criteria

• Physically active (> 1,000 MET/min/wk) for at least six months. Weight stable for previous 6 months (+/-2.5 kg) Female subjects only- reported regular menstrual cycles for the last 2 years

Exclusion Criteria

1. BP>140/90 mmHg

2. BMI>40 kg/m2

3. Diabetes

4. Familial hypercholesterolemia

5. Past or current history of CHD, stroke or major CVD events. Respiratory diseases (not including asthma), endocrine or metabolic, neurological, or hematological disorders that would compromise the study or the health of the subject.

6. Women must not be pregnant, plan to become pregnant during the study, or be nursing

7. Active renal or liver disease

8. All medications and supplements that influence dependent variables*

9. Recent surgery < 2 months

10. Alcohol abuse

11. Sleep apnea

12. Claustrophobia

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 40 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

Teri Herberger

OTHER

Sponsor Role: lead

Responsible Party

Teri Herberger

Director of Sponsored Research Programs

Responsibility Role: SPONSOR_INVESTIGATOR

Locations

Salisbury University

Salisbury, Maryland, United States

Countries

United States

Other Identifiers

#430

Identifier Type: -

Identifier Source: org_study_id