High intensity training to improve diaphragm function in people with chronic low back pain

The Breathe-(H)IT Trial: Multimodal High Intensity Training to Improve Diaphragm Functioning in Persons With Chronic Nonspecific Low Back Pain

Not applicable Interventional Hasselt University · NCT05384457

This study is testing whether high intensity training can improve diaphragm strength and overall health in people with chronic low back pain compared to moderate intensity training.

Quick facts

PhaseNot applicable
Study typeInterventional
Enrollment64 (estimated)
Ages18 Years to 65 Years
SexAll
SponsorHasselt University Academic / other
Locations1 site (Diepenbeek, Limburg)
Trial IDNCT05384457 on ClinicalTrials.gov

What this trial studies

This randomized controlled trial investigates the effects of high intensity training (HIT) versus moderate intensity training (MIT) on diaphragm muscle strength, endurance, fatigue, and activation in individuals with chronic nonspecific low back pain (CNSLBP). The study also examines how changes in diaphragm functioning relate to improvements in cardiorespiratory fitness, postural control, pain, and disability. Additionally, it explores the role of depressive mood and anxiety in moderating the effects of HIT on diaphragm function. The hypothesis is that HIT will yield greater improvements compared to MIT in this patient population.

Who should consider this trial

Good fit: Ideal candidates are Dutch-speaking adults aged 18-65 with chronic nonspecific low back pain lasting at least 12 weeks.

Not a fit: Patients with a history of spinal fusion or other significant musculoskeletal disorders may not benefit from this study.

Why it matters

Potential benefit: If successful, this approach could significantly enhance diaphragm function and reduce disability in patients suffering from chronic low back pain.

How similar studies have performed: Previous studies have indicated that high intensity training can lead to better outcomes in similar populations, suggesting potential success for this approach.

Eligibility criteria

Show full inclusion / exclusion criteria
Inclusion Criterian (CNSLBP patients):

* Dutch-speaking
* Adults (age 18-65 years)
* Chronic low back pain (i.e. pain localized below the costal margin and above the inferior gluteal folds, with or without referred leg pain for a period of at least twelve weeks), with a non-specific origin (i.e. pain of a nociceptive mechanical nature, not attributable to a recognizable, known, specific pathology, e.g. infection, tumour, osteoporosis, fracture, structural deformity, inflammatory disorder, radicular syndrome, or cauda equina syndrome)

Exclusion Criteria (CNSLBP patients):

* History of spinal fusion
* A musculoskeletal disorder aside from chronic nonspecific low back pain that could affect the correct execution of the therapy program
* Baseline characteristics that could affect the evaluation of the outcomes (a pacemaker, a chronic obstructive respiratory disorder, or known balance/vestibular problems)
* Severe comorbidities (e.g., paresis or sensory disturbances of neurological origin, diabetes mellitus, rheumatoid arthritis)
* Ongoing compensation claims
* Negative advice from the general practitioner regarding sports medical screening
* Pregnancy
* Persons that are not able to attend regular appointments

Inclusion Criteria (healthy volunteers):

* Dutch-speaking
* Adults (age 18-65 years)
* No acute or chronic complaints

Exclusion Criteria (healthy volunteers):

* History of spinal fusion
* Baseline characteristics that could affect the evaluation of the outcomes (a pacemaker, a chronic obstructive respiratory disorder, or known balance/vestibular problems)
* Severe comorbidities (e.g., paresis or sensory disturbances of neurological origin, diabetes mellitus, rheumatoid arthritis)
* Ongoing compensation claims
* Negative advice from the general practitioner regarding sports medical screening
* Pregnancy

Where this trial is running

Diepenbeek, Limburg

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.
Conditions Low Back PainChronic Low-back PainChronic Pain
Last reviewed 2026-06-15 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.