Is an 8-week inspiratory Muscle Strengthening protocol capable of improving pain in people with Nonspecific Chronic Low Back Pain and Inspiratory Muscle Weakness? A randomized clinical trial

Is an 8-week high-intensity Inspiratory Muscle Training protocol capable of improving pain in people with Nonspecific Chronic Low Back Pain and Inspiratory Muscle Weakness? A randomized clinical trial

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

REBEC

Registry ID

RBR-99wydk7

Enrollment

Registered

2026-06-19

Start date

2026-11-09

Completion date

Unknown

Last updated

2026-06-22

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Low Back Pain Chronic Pain

Interventions

This is a two-arm, triple-blind, randomized controlled clinical trial. The sample will consist of 66 individuals with nonspecific chronic low back pain who will be randomly and simply allocated to the

Eligibility

Age

18 Years to 59 Years

Inclusion criteria

Inclusion criteria: Both sexes; Age between 18 and 59 years; presenting with nonspecific and localized low back pain for at least 3 months; pain intensity between 3 and 8 on the numerical pain scale; inspiratory muscle weakness (when the actual value is between 50% and 80% of the predicted value); Body Mass Index (BMI) between 18.5 and 30 kg/m²; no history of cardiothoracic, abdominal or spinal surgery; no diagnosis of chronic musculoskeletal, neurological and cardiopulmonary diseases; no prior experience with Inspiratory Muscle Training with Threshold Pressure Load; Hemodynamic stability (systolic blood pressure = 90 mmHg and = 180 mmHg, diastolic blood pressure = 60 mmHg and = 110 mmHg, heart rate = 60 bpm and = 140 bpm, respiratory rate = 35 breaths per minute, peripheral oxygen saturation = 85%); absence of recent acute myocardial infarction (one month prior to admission to the study), unstable angina, severe arrhythmias and valvular heart disease, uncontrolled systemic arterial hypertension (SBP > 190 mmHg; DBP > 120 mmHg).

Exclusion criteria

Exclusion criteria: Those who fail to complete the protocol in its entirety, with 3 consecutive absences; inability to understand and/or perform data collection procedures; refusal to sign the Informed Consent Form; hemodynamic alteration with an abrupt increase in Systolic Blood Pressure > 25 mmHg during Inspiratory Muscle Training.

Design outcomes

Primary

Measure	Time frame
To evaluate the effect of Inspiratory Muscle Training on Pain Intensity, which will be measured using the Numerical Pain Scale (NPS). At the beginning and end of the study, the patient will be asked to circle the number representing their pain level at three points in time: at rest, during movement, and during the Timed Up and Go (TUG) test.	—

Secondary

Measure	Time frame
The effects of the intervention on the secondary outcomes of Functional Disability, Functional Mobility, Trunk Range of Motion, Respiratory Muscle Strength, Ventilatory Capacity, and Quality of Life are expected to be observed.	—

Countries

Contacts

Public ContactRosimário Pereira

Faculdade de Ciências da Saúde do Trairi, Universidade Federal do Rio Grande do Norte

rosimario_pereira@outlook.com+5584988805672

Outcome results

None listed

Source: REBEC (via WHO ICTRP) · Data processed: Jun 29, 2026