NCT02882555

Effect of Muscular Exercise on Cough Reflex

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 60 (actual)
• Sponsor: Central Hospital, Nancy, France · Academic / Other
• Sex: All
• Age: 7 Years – 77 Years
• Healthy volunteers: Accepted

Summary

The hypothesis is that the cough reflex induced by capsaicin is inhibited during exercise. The purpose of this study is to determine if a short muscular exercise inhibits the cough reflex induced by capsaicin inhalation.

Detailed description

Cough is an important reflex of defense of airways. It is also one of the more frequent symptoms during respiratory diseases. Chronic cough can be a disabling condition, apparently idiopathic or associated to pathology such as asthma, sinusitis with posterior discharge or gastroesophageal reflux. Factors susceptible to provoke or increase cough are well known, but inhibiting factors are much less known. Muscular exercise is thought to influence respiratory reflexes in a considerable and complicated way. For example, a bronchodilation is observed in healthy or asthmatic individuals, but recovery period frequently triggers asthma attacks. Effects of exercise on cough reflex are much less known. This study aims to determine the influence of muscular exercise on cough reflex in children and healthy adults. Highlighting the inhibition of cough reflex by exercise can have a significant effect on chronic cough patient care. There is actually no symptomatic treatment really effective without side effects.

Conditions

• Cough

Interventions

Type	Name	Description
BEHAVIORAL	Exercise	6 min running on a motor-driven tredmill in a climate room (18-20°C, humidity \<10 mg/l). Tredmill speed and slope are adjusted to increase heart rate to about 80 % of maximum value predicted for age (= 210 - age in years) during the first 2-3 min and pursued until the end of exercise (3-4 min). Heart rate is measured during the whole exercise.
DRUG	Capsaicin	A compressed air-driven nebuliser is controlled by a dosimeter and a valve is used to deliver similar inspiratory flows for 400 msec in children and 1200 msec in adults.
DRUG	Normal saline	A compressed air-driven nebuliser is controlled by a dosimeter and a valve is used to deliver similar inspiratory flows for 400 msec in children and 1200 msec in adults.

Timeline

• Start date: 2012-06-01
• Primary completion: 2013-12-01
• Completion: 2013-12-01
• First posted: 2016-08-30
• Last updated: 2016-08-30