Clinical trial NCT03923660: Ventilatory Adaptation to Concentric Versus Eccentric Exercise in Patients With Severe COPD
Official title: Ventilatory Adaptation to Concentric Versus Eccentric Exercise in Patients With Severe COPD
Study type: INTERVENTIONAL
Overall status: UNKNOWN
Phase: NA
Conditions: Chronic Obstructive Pulmonary Disease Severe
Keywords: COPD
breathing pattern
exercise
concentric
eccentric
Lead sponsor: Centre Hospitalier Universitaire de Besancon
Sponsor class: OTHER
First posted: 2019-04-22
Enrollment: 20
Sex: ALL
Minimum age (years): 40
Maximum age (years): 80
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: CROSSOVER
Primary purpose: TREATMENT

Brief summary: Pulmonary rehabilitation (PR) based on concentric exercise training has become an integral component in the treatment of patients with chronic obstructive pulmonary disease (COPD), improving functional capacities while diminishing symptoms and improving quality of life.

However, the response to concentric exercise training is heterogeneous from one COPD patient to another. The inability of some COPD patients to achieve the exercise intensities required to stress limb muscles due to severe ventilatory limitation could partially explain their poor response to training.

Endurance exercise with eccentric muscle contractions could be an interesting alternative to concentric exercise because it produces greater muscle force through its lower metabolic cost. Eccentric exercise could allow patients with severe airflow limitation to perform prolonged exercise sessions with sufficient intensity to improve muscle function.

Nevertheless, a recent study performed in healthy young subjects reported that eccentric exercise induced a more hyperpneic breathing pattern (i.e., lower tidal volume and higher breathing frequency) that concentric for a given minute ventilation.

The main objective of CONvEX study is to compare ventilatory adaptation between two modalities of exercise performed on cycle ergometer (concentric versus eccentric) in severe COPD patients.

Detailed description: Pulmonary rehabilitation (PR) based on concentric exercise training has become an integral component in the treatment of patients with chronic obstructive pulmonary disease (COPD), improving functional capacities while diminishing symptoms and improving quality of life.

However, the response to concentric exercise training is heterogeneous from one COPD patient to another. The inability of some COPD patients to achieve the exercise intensities required to stress limb muscles due to severe ventilatory limitation could partially explain their poor response to training.

Endurance exercise with eccentric muscle contractions could be an interesting alternative to concentric exercise because it produces greater muscle force through its lower metabolic cost. Eccentric exercise could allow patients with severe airflow limitation to perform prolonged exercise sessions with sufficient intensity to improve muscle function.

Nevertheless, a recent study performed in healthy young subjects reported that eccentric exercise induced a more hyperpneic breathing pattern (i.e., lower tidal volume and higher breathing frequency) that concentric for a given minute ventilation.

The main objective of CONvEX study is to compare ventilatory adaptation between two modalities of exercise performed on cycle ergometer (concentric versus eccentric) in severe COPD patients.

Eligibility criteria: Inclusion Criteria:

* Severe COPD (FEV1 \[forced expiratory volume in 1 second\] / FVC \[forced vital capacity\] \< 70% et FEV1 \< 50%)
* Informed consent
* Affiliation to a social security scheme

Exclusion Criteria:

* Effort oxygen therapy
* Cardiovascular, neuromuscular or musculoskeletal disorders that can provide significant dyspnea or limit exercise
* Legal incapacity
* Low or no cooperation anticipated

Primary outcomes:
measure: Ventilatory adaptation
timeFrame: week 1
Secondary outcomes:
measure: Dynamic hyperinflation
timeFrame: week 1
measure: Brachial muscle enrollment
timeFrame: week 1
measure: Quadriceps muscle enrollment
timeFrame: week 1
measure: Ventilatory efficiency
timeFrame: week 1
measure: Ventilatory efficiency
timeFrame: week 1
measure: Tolerance
timeFrame: week 1
Other outcomes:
Locations:
city: Besançon
country: France
facility: CHU de Besançon
Study officials:
References: