Blood Pressure Following Isometric Exercise in Inactive Adults
NCT ID: NCT06937164
Last Updated: 2025-05-16
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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RECRUITING
NA
36 participants
INTERVENTIONAL
2025-04-21
2025-09-30
Brief Summary
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The purpose of this study is to assess both the immediate (acute) and long-term (chronic) effects of IET on cardiovascular outcomes. Participants will complete a series of lab-based exercise sessions over several weeks. In these sessions, they will perform repeated bouts of isometric leg extensions while seated on an exercise machine designed to measure muscle force.
Throughout the study, researchers will monitor participants' blood pressure, heart rate, and muscle activity. Acute responses-such as post-exercise hypotension (a short-term drop in blood pressure)-will be measured immediately after exercise. Chronic changes, such as resting blood pressure improvements, will be evaluated across the training period.
Additional measurements will include heart rate variability (HRV), which gives insight into autonomic nervous system activity, and electromyography (EMG), which tracks muscle fatigue and activation patterns. These data will help explore potential mechanisms behind the cardiovascular benefits of IET.
By examining how repeated sessions of isometric exercise influence blood pressure and related physiological responses, this research may support the use of IET as a non-pharmacological strategy for managing or preventing hypertension in physically inactive individuals.
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Detailed Description
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Conditions
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Study Design
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RANDOMIZED
PARALLEL
BASIC_SCIENCE
SINGLE
Study Groups
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Neutral Information + Isometric Exercise
Participants in this group complete repeated isometric exercise training sessions. Prior to training, they receive a neutral informational presentation about isometric exercise, which does not mention blood pressure or cardiovascular benefits. The exercise consists of bilateral isometric leg extensions on a dynamometer. Cardiovascular and neuromuscular outcomes, including blood pressure, heart rate variability, and muscle fatigue, are monitored throughout the intervention period.
Isometric Exercise Training (IET)
Participants perform four repetitions of 90 degree bilateral isometric leg extensions on a dynamometer at 30% of their maximum voluntary contraction (MVC). Each contraction is held for 2 minutes, with 2-minute rest intervals between bouts. Sessions are performed three times per week for four weeks. This behavioral intervention is designed to investigate the acute and chronic effects of isometric exercise on blood pressure, heart rate variability, and muscle fatigue.
Expectation-Enhancing Info + Isometric Exercise
Participants in this group complete repeated isometric exercise training sessions. Prior to training, they receive an expectation-enhancing informational presentation that emphasizes the effectiveness of isometric exercise as a non-pharmacological intervention for reducing blood pressure. The exercise consists of bilateral isometric leg extensions on a dynamometer. Blood pressure, heart rate variability, and muscle activity are assessed to determine physiological responses to the intervention.
Isometric Exercise Training (IET)
Participants perform four repetitions of 90 degree bilateral isometric leg extensions on a dynamometer at 30% of their maximum voluntary contraction (MVC). Each contraction is held for 2 minutes, with 2-minute rest intervals between bouts. Sessions are performed three times per week for four weeks. This behavioral intervention is designed to investigate the acute and chronic effects of isometric exercise on blood pressure, heart rate variability, and muscle fatigue.
Expectation-Enhancing Informational Framing
Participants receive a brief standardized presentation highlighting isometric exercise as an evidence-based intervention for lowering blood pressure. The presentation includes statements designed to enhance outcome expectations based on prior literature and expert framing.
No-Intervention Control
Participants in this group do not receive any intervention or educational presentation. They attend study visits for assessment purposes only. Measurements include resting blood pressure, heart rate variability, and muscle activity, allowing for comparison with the intervention groups to evaluate the effects of isometric exercise training.
No interventions assigned to this group
Interventions
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Isometric Exercise Training (IET)
Participants perform four repetitions of 90 degree bilateral isometric leg extensions on a dynamometer at 30% of their maximum voluntary contraction (MVC). Each contraction is held for 2 minutes, with 2-minute rest intervals between bouts. Sessions are performed three times per week for four weeks. This behavioral intervention is designed to investigate the acute and chronic effects of isometric exercise on blood pressure, heart rate variability, and muscle fatigue.
Expectation-Enhancing Informational Framing
Participants receive a brief standardized presentation highlighting isometric exercise as an evidence-based intervention for lowering blood pressure. The presentation includes statements designed to enhance outcome expectations based on prior literature and expert framing.
Other Intervention Names
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Eligibility Criteria
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Inclusion Criteria
* Self-reported physically inactive or insufficiently active (not meeting current physical activity guidelines)
* Not currently engaged in structured resistance or isometric exercise training
* Able to attend lab sessions over a 4-week period
* Provides written informed consent
Exclusion Criteria
* Any known cardiovascular, neurological, or musculoskeletal condition contraindicating isometric exercise
* Formal education or professional background in exercise science, physiology, or a related field
* Pregnant or planning to become pregnant during the study period
* Inability to follow verbal instructions or complete study protocols
18 Years
55 Years
ALL
Yes
Sponsors
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Canterbury Christ Church University
OTHER
Responsible Party
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Principal Investigators
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Sean Machak
Role: PRINCIPAL_INVESTIGATOR
Canterbury Christ Church University
Locations
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Canterbury Christ Church University
Canterbury, Kent, United Kingdom
Countries
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Central Contacts
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Facility Contacts
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Other Identifiers
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ETH2223-0326
Identifier Type: -
Identifier Source: org_study_id
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