AzTrials
AzTrials

HypertensionIsoFIT-BPNCT04936022

Isometric Exercise for People With Raised Blood Pressure

A study testing Isometric Exercise in people with Hypertension, run by East Kent Hospitals University NHS Foundation Trust at 6 sites in United Kingdom.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
Search all trials

Trial summary

High blood pressure affects many people in the United Kingdom. People with raised blood pressure (140-159/90-99 mmHg) are recommended to make changes in their lifestyle (e.g. smoking/alcohol/diet/exercise) and/or medication in order to reduce their blood pressure. Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Hypertension
What is being tested?
Isometric Exercise
Could I receive a placebo?
No, everyone receives an active treatment
How many people
84 participants
Where
6 sitesUnited Kingdom
Study dates
1 Feb 2020to 30 Nov 2022
Phase
Interventional
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Aged 18 or over
  • Clinic systolic BP 140-159 mmHg
  • Able to provide informed consent

Who cannot join

  • Currently taking anti-hypertensive medication
  • White coat hypertension, as evidenced by averaged home systolic BP <135 mmHg
  • Inability to undertake study intervention (isometric exercise)
  • Previous history of any of the following:
  • Diabetes mellitus (Type 1 or type 2)
  • Ischaemic heart disease (myocardial infarction and/or coronary angina and/or coronary revascularization procedure)
Show all 18Show fewer
  • Moderate or severe stenotic or regurgitant heart valve disease
  • Atrial or ventricular arrhythmia
  • Stroke or transient ischaemic attack
  • Aortic aneurysm and/or peripheral arterial disease
  • Uncorrected congenital or inherited heart condition
  • Estimated glomerular filtration rate <45 ml/min (calculated using CKD-EPI or MDRD formulae, and taking most recent documented results)
  • Documented left ventricular ejection fraction <45% and/or left ventricular hypertrophy (by either echocardiography or standard ECG criteria e.g. Sokolow-Lyon)
  • Documented urine albumin:creatinine ratio >3.5 mg/mmol
  • Inability to provide informed consent
  • If female, pregnancy or currently breast feeding
  • Enrolled in another Clinical Trial of an Interventional Medicinal Product or Medical Device or other interventional study
  • Medical condition that, in the opinion of the investigator, would make the participant unsuitable for the study

Trial locations and contacts

6 sites in 1 country.

6 sites in 1 country

United Kingdom6 sites
  • Maywood Healthcare Centre

    Bognor Regis, West Sussex, PO212UW

  • Canterbury Medical Practice

    Canterbury, Kent, CT45BL

  • Kent and Canterbury Hospital

    Canterbury, Kent

  • St Helier Hospital

    Carshalton, Surrey, SM51AA

  • Newton Place Surgery

    Faversham, Kent, ME138FH

  • Brighton Health and Wellbeing Centre

    Hove, BN31AE

Other trials in United Kingdom

About this study

Official title: Feasibility Study to Assess the Delivery of a Novel Isometric Exercise Intervention for People With Stage 1 Hypertension in the NHS

High blood pressure affects many people in the United Kingdom. People with raised blood pressure (140-159/90-99 mmHg) are recommended to make changes in their lifestyle (e.g. smoking/alcohol/diet/exercise) and/or medication in order to reduce their blood pressure. Current knowledge suggests that a particular type of exercise - isometric exercise - can lower blood pressure. Isometric exercise involves holding a fixed body position for a short period of time. As most of the information about the benefits of this type of exercise comes from laboratory-based studies, researchers want to find out if it is possible for GP practices to offer NHS patients with clinically high blood pressure an isometric exercise plan to do at home and how it might affect their blood pressure over 6 months. They will also find out the experiences of those doing this type of exercise and whether it can be done consistently at home over time.

Conditions
Hypertension
Being tested
Isometric Exercise, Standard care lifestyle advice
Keywords
Isometric exercise, Exercise, Hypertension, High blood pressure, General practice, Feasibility study
Medical subject headings
Hypertension, Motor Activity

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Isometric ExerciseOther

    Prescribed 6 months of isometric exercise training (three sessions per week, comprised of 4 x 2-minute bouts with 2-minute recovery periods in-between).

  • Standard care lifestyle adviceBehavioural

    Healthy lifestyle advice for hypertension, given by a healthcare professional.

Study groups in NCT04936022
Study groupRoleWhat they receive
ControlOtherTo receive standard care lifestyle advice only
Receives: Behavioral: Standard care lifestyle advice
Isometric ExerciseExperimentalTo receive standard care lifestyle advice plus 3 sessions of isometric exercise per week
Receives: Other: Isometric Exercise; Behavioral: Standard care lifestyle advice

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Experience of intervention delivery

    Qualitative focus groups with health care professionals identifying the type and number of each barrier and facilitator, of the practical delivery of isometric exercise intervention.

    Measured: Project month 11

  2. Change in systolic blood pressure (mmHg) from baseline to Week 4.

    Measured: Participant week 4

  3. Change in systolic blood pressure (mmHg) from baseline to Month 3.

    Measured: Participant 3 months

  4. Change in systolic blood pressure (mmHg) from baseline to Month 6.

    Measured: Participant 6 months

Secondary outcomes (45)
  1. Early fidelity of the isometric exercise prescription.

    Assessed by checking whether individual participant's heart rate (bpm) measures fall within 95% of their peak heart rate confidence intervals following the first three training sessions.

    Measured: Participant week 1

  2. Short-term fidelity of the isometric exercise prescription.

    Assessed by checking whether individual participant's heart rate (bpm) measures fall within 95% of their peak heart rate confidence intervals following the first four weeks (12) of training sessions.

    Measured: Participant week 4

  3. Short-term adherence to the Isometric exercise (IE) training.

    Measured using the proportion of participants (number) completing a minimum of 8 of 12 IE sessions up to the 4-week point.

    Measured: Participant week 4

  4. Mid-term adherence to the Isometric exercise training.

    Measured using the proportion of participants (number) completing a minimum of two thirds of all IE sessions up to 3 months.

    Measured: Participant 3 Months

  5. Long-term adherence to the Isometric exercise training.

    Measured using the proportion of participants (number) completing a minimum of two thirds of all IE sessions up to 6 months.

    Measured: Participant 6 Months

  6. Recruitment rates from data collected at sites.

    This will be measured by calculating the average number of participants recruited per week.

    Measured: Project month 10

  7. Short-term attrition rates from data collected at sites.

    This will be measured by calculating the number of withdrawals from the study up to 4 weeks.

    Measured: Participant week 4

  8. Mid-term attrition rates from data collected at sites.

    This will be measured by calculating the number of withdrawals from the study up to 3 months.

    Measured: Participant 3 months

  9. Long-term attrition rates from data collected at sites.

    This will be measured by calculating the number of withdrawals from the study up to 6 months.

    Measured: Participant 6 months

  10. Change in diastolic blood pressure (mmHg) from baseline to Week 4.

    Measured: Week 4

  11. Change in diastolic blood pressure (mmHg) from baseline to Month 3.

    Measured: Month 3

  12. Change in diastolic blood pressure (mmHg) from baseline to Month 6.

    Measured: Month 6

  13. Experience of isometric exercise intervention.

    Qualitative focus groups with study participants identifying the number of positive and negative experiences of the isometric exercise intervention and taking part in the study.

    Measured: Month 11

  14. Participant experiences of undertaking isometric exercise.

    Collected using participant study-specific survey with closed and open questions.

    Measured: Participant week 4.

  15. Subjective opinion of healthcare professionals on their willingness to consider the intervention as a treatment option for patients with Stage 1 hypertension.

    Collected using semi-structured interviews conducted by telephone with healthcare professionals from GP practices not taking part as study recruitment sites.

    Measured: Project month 11.

  16. Short-term Quality-adjusted life years (QALYs) calculated from patients' responses to the EQ-5D-5L questionnaire.

    The health profile established from EQ-5D-5L will be converted into a utility index (0 and 1) using the validated mapping function to derive utility values for EQ-5D-5L from the existing EQ-5D-3L. These utilities will be multiplied by the time spent in each state to generate QALYs.

    Measured: Participant 4 weeks

  17. Mid-term Quality-adjusted life years calculated from patients' responses to the EQ-5D-5L questionnaire.

    The health profile established from EQ-5D-5L will be converted into a utility index (0 and 1) using the validated mapping function to derive utility values for EQ-5D-5L from the existing EQ-5D-3L. These utilities will be multiplied by the time spent in each state to generate QALYs.

    Measured: Participant 3 months

  18. Long-term Quality-adjusted life years calculated from patients' responses to the EQ-5D-5L questionnaire.

    The health profile established from EQ-5D-5L will be converted into a utility index (0 and 1) using the validated mapping function to derive utility values for EQ-5D-5L from the existing EQ-5D-3L. These utilities will be multiplied by the time spent in each state to generate QALYs.

    Measured: Participant 6 months

  19. Healthcare resource utilisation (a).

    Measuring healthcare access by using the number of GP visits at 4 weeks.

    Measured: Participant 4 weeks.

  20. Healthcare resource utilisation (a).

    Measuring healthcare access by using the number of GP visits at 3 months.

    Measured: Participant 3 months

  21. Healthcare resource utilisation (a).

    Measuring healthcare access by using the number of GP visits at 6 months.

    Measured: Participant 6 months

  22. Healthcare resource utilisation (b).

    Measuring healthcare access by using the number of nurse visits at 4 weeks.

    Measured: Participant 4 weeks.

  23. Healthcare resource utilisation (b).

    Measuring healthcare access by using the number of nurse visits at 3 months.

    Measured: Participant 3 months.

  24. Healthcare resource utilisation (b).

    Measuring healthcare access by using the number of nurse visits at 6 months.

    Measured: Participant 6 months.

  25. Healthcare resource utilisation (c).

    Measuring healthcare access by using the number of other health professionals visits at 4 weeks.

    Measured: Participant 4 weeks.

  26. Healthcare resource utilisation (c).

    Measuring healthcare access by using the number of other health professionals visits at 3 months.

    Measured: Participant 3 months.

  27. Healthcare resource utilisation (c).

    Measuring healthcare access by using the number of other health professionals visits at 6 months.

    Measured: Participant 6 months.

  28. Healthcare resource utilisation (d).

    Measuring healthcare access by using the number of number of A\&E attendances at 4 weeks.

    Measured: Participant 4 weeks.

  29. Healthcare resource utilisation (d).

    Measuring healthcare access by using the number of number of A\&E attendances at 3 months.

    Measured: Participant 3 months.

  30. Healthcare resource utilisation (d).

    Measuring healthcare access by using the number of number of A\&E attendances at 6 months.

    Measured: Participant 6 months.

  31. Healthcare resource utilisation (e).

    Measuring healthcare access by using the number of number of inpatient hospital admissions at 4 weeks.

    Measured: Participant 4 weeks.

  32. Healthcare resource utilisation (e).

    Measuring healthcare access by using the number of number of inpatient hospital admissions at 3 months.

    Measured: Participant 3 months.

  33. Healthcare resource utilisation (e).

    Measuring healthcare access by using the number of inpatient hospital admissions at 6 months.

    Measured: Participant 6 months.

  34. Healthcare resource utilisation (f).

    Measuring healthcare access by using the number of inpatient diagnostic tests at 4 weeks.

    Measured: Participant 4 weeks.

  35. Healthcare resource utilisation (f).

    Measuring healthcare access by using the number of inpatient diagnostic tests at 3 months.

    Measured: Participant 3 months.

  36. Healthcare resource utilisation (f).

    Measuring healthcare access by using the number of inpatient diagnostic tests at 6 months.

    Measured: Participant 6 months.

  37. Intervention costs.

    This will be measured by calculating the time cost of the training team and healthcare professionals, the cost of supplies and the equipment necessary to implement the intervention.

    Measured: Participant 4 weeks.

  38. Intervention costs.

    This will be measured by. calculating the time cost of the training team and healthcare professionals, the cost of supplies and the equipment necessary to implement the intervention.

    Measured: Participant 3 months.

  39. Intervention costs

    This will be measured by calculating the time cost of the training team and healthcare professionals, the cost of supplies and the equipment necessary to implement the intervention.

    Measured: Participant 6 months.

  40. Medication at short-term time point (a)

    Measured using the frequency per week in days, start and end date per medication at 4 weeks.

    Measured: Participant 4 weeks.

  41. Medication at mid-term time point (a)

    Measuring the frequency per week in days, start and end date per medication at 3 months.

    Measured: Participant 3 months.

  42. Medication at long-term time point (a)

    Measuring the frequency per week in days, start and end date per medication at 6 months.

    Measured: Participant 6 months.

  43. Medication at short-term time point (b)

    Measured using the dosage per day (mg), start and end date per medication at 4 weeks.

    Measured: Participant 4 weeks.

  44. Medication at mid-term time point (b)

    Measuring the dosage per day (mg), start and end date per medication at 3 months.

    Measured: Participant 3 months.

  45. Medication at long-term time point (b)

    Measuring the dosage per day (mg), start and end date per medication at 6 months.

    Measured: Participant 6 months.

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted23 Jun 2021
  2. Study start1 Feb 2020
  3. Primary completion30 Nov 2022
  4. Study completion30 Nov 2022

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Other
Allocation
Randomised
Intervention model
Parallel groups
Model description
Multi-centre randomized controlled feasibility study
Masking
None (open label)
Enrolment
84 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT04936022
Sponsor's protocol ID
NIHR200485
Other IDs
13472393
Acronym
IsoFIT-BP
Status last verified
Sep 2023
First submitted
19 Apr 2021
Last updated
15 Sep 2023
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
Yes: The datasets generated during and/or analysed during the current study are/will be available upon request from Dr Jonathan Wiles (jim.wiles@canterbury.ac.uk). The data will become available 1 year after the study finishes which will be approximately December 2022 and may be accessed for up to 5 years. Anonymised data may be accessed by researchers at universities, NHS organisations or other healthcare providers where the sharing of data has a clearly defined purpose and its use will be of benefit to wider society. Data will be shared by secure data transfer. Consent from participants was obtained for the use of their information for future research and to be shared anonymously with other researchers.

Publications

  • Wiles JD, Santer E, Rees-Roberts M, Borthwick R, Doulton T, Swift PA, Pellatt-Higgins T, Saxby K, Mills A, Gousia K, MacInnes D, O'Driscoll J, West A, Darby J, Short V, Farmer CK. Feasibility randomised controlled trial to assess the delivery of a novel isometric exercise intervention for people diagnosed with uncomplicated stage 1 hypertension in the National Health Service: key quantitative findings. BMJ Open. 2025 Jun 4;15(6):e091219. doi: 10.1136/bmjopen-2024-091219.

    PubMed 40467325

Questions about this trial

What is this clinical trial studying?

A study testing Isometric Exercise in people with Hypertension, run by East Kent Hospitals University NHS Foundation Trust at 6 sites in United Kingdom.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 3 inclusion and 18 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 15 Sep 2023. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 6 sites in United Kingdom. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Experience of intervention delivery (time frame: Project month 11). The study lists 4 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT04936022, which also lists 1 linked publication.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 15 Sep 2023.

Free account

Log in to keep searching

You’ve used your 3 free searches. AzTrials is free: log in or create a free account to keep searching clinical trials and save the ones you want to follow.

Create a free accountLog in