Clinical trial NCT02027675: Meal-Exercise Challenge and Physical Activity Reduction Impact on Immunity and Inflammation
Official title: Meal-Exercise Challenge and Physical Activity Reduction Impact on Immunity and Inflammation
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Asthma
Obesity
Keywords: exercise
immune function
inflammation
immunity
diet
obesity
asthma
Lead sponsor: Universidade do Porto
Sponsor class: OTHER
First posted: 2014-01-06
Enrollment: 42
Sex: ALL
Minimum age (years): 18
Maximum age (years): 35
Standard ages: ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: CROSSOVER
Primary purpose: TREATMENT

Brief summary: In a society where exercise is prescribed by physicians to increase physical condition, improve dietary habits and reduce cardiovascular risk, the impact of exercise, acute or chronic, and diet in inflammation and immunity is unknown. Specific populations can have different responses towards acute and chronic exercise. Moreover specific conditions, like the type of meal ingested, can interfere with these responses. The true effect of pre-competitive meal exercise in the immunity and inflammatory response is unknown. Acute physical inactivity periods, commonly happens during daily life, related to work or acute illness. New evidence points out that it induces immediate metabolic and endocrinological changes, these can might also be associated with changes in immune response.

Aims of this project are:

1. to assess the effect of the precompetitive meal on the inflammatory, neuro-immune and metabolic response to exercise;
2. to assess the effects of sedentary behaviour on inflammatory, neuro-immune and metabolic response;
3. to assess differences in changes between healthy, asthmatic and obese subjects

Detailed description: Two interventions will be performed for assessing the research questions and aims:

A) Randomized cross-over, with a wash out period of 7 days, single-blinded trial where two different pre-competitive meals will be followed by an exercise challenge; inflammatory neuro-immune and metabolic response will be assessed before and after each challenge.

Participants will be recruited from advertisement and four different groups will be compared: obese-asthmatic; asthmatic non-obese; obese without asthma and non-asthmatic and non-obese. All patients will be allocated to a meal challenge in which a high fat poor micronutrient meal followed by a Mediterranean meal or vice-versa; meal challenge order will be randomized and participants will be blinded to the intervention. The main outcome for this intervention will be airway inflammation and lung function. All outcomes will be assessed before and 3h after each meal.

A group of individuals will, in the three hours after the meal, perform an exercise challenge, which is aimed to induce acute immune changes.

B) Randomized controlled trial where participants, after a run-in period and eligibility evaluation, will be allocated to an intervention consisting in a reduction of physical activity by 50% or maintaining habitual physical activity for two weeks; inflammatory neuro-immune and metabolic response will be assessed before and after intervention.

Eligibility criteria: Inclusion Criteria:

* controlled mild to moderate asthma;
* Body mass index (BMI) ≥ 25 kg/m2; healthy participants (non asthmatic with a BMI 18,5 to 25 kg/m2) will be used for comparison;

Exclusion Criteria:

* respiratory disease other than asthma;
* severe asthma according to Global Initiative for Asthma (GINA) guidelines
* occurrence in previous 4 weeks of screening of upper/lower respiratory tract infection;
* smoking in the past 6 months and requiring mechanical ventilation for respiratory event within 6 months of screening.
* Medical conditions (hematologic, cardiovascular, renal, hepatic, neurologic or metabolic) or medication that may interfere with meal or physical activity intervention;
* Significant chronic infectious diseases (eg, HIV, hepatitis B or C);
* Abnormal electrocardiogram screening, cardiac arrhythmia, angina, congestive heart failure; renal or hepatic failure and systemic disease, mal-absorption disease history or intestinal inflammatory disease;
* Women breast-feeding, pregnant or intending pregnancy during study

Primary outcomes:
measure: Airway inflammation
timeFrame: Up to 6 months
Secondary outcomes:
measure: Autonomic nervous system response
timeFrame: Up to 6 months
measure: Oxidative stress biomarkers
timeFrame: Up to 6 months
measure: Circulating blood leukocyte-total and differential leukocyte counts and lymphocyte subpopulations assessment.
timeFrame: Up to 6 months
Other outcomes:
measure: Histamine skin test reactivity
timeFrame: Up to 6 months
Locations:
city: Portugal
country: Portugal
facility: Faculty of Medicine of Porto University
state: Porto
city: Porto
country: Portugal
facility: Faculty of Nutrition and Food Sciences of the University of Porto
city: Porto
country: Portugal
facility: Faculty of Sports of Porto University
Study officials:
affiliation: Faculty of Medicine of Porto University
name: Diana Silva, MD
role: PRINCIPAL_INVESTIGATOR
affiliation: Faculty of Nutrition and Food Sciences of the University of Porto
name: Rita Moreira
role: PRINCIPAL_INVESTIGATOR
References: