Cytokine and Stress Hormone Responses to Exercise-induced Hypoxemia Among Endurance-trained

Exercise-induced Arterial Hypoxemia Clinical Trial

Official title:

Effect of Exercise-induced Hypoxemia on Cytokine and Stress Hormone Responses Among Endurance-trained Athletes

Clinical Trial Details — Status: Enrolling by invitation

Administrative data

• NCT number: NCT04305873
• Other study ID #: EIAH1
• Status: Enrolling by invitation
• Start date: March 1, 2020
• Est. completion date: September 1, 2024

Study information

• Verified date: February 2024
• Source: Tel Aviv University
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

It is well documented that exercise-induced arterial hypoxemia (EIAH) is highly prevalent among endurance-trained athletes performing heavy intensity exercise, regardless of sex and age. Although it has been shown that a drop in arterial oxyhemoglobin saturation (SaO2) during exercise (i.e. EIAH) negatively affects aerobic capacity measures such as VO2max and time trial performance, there remains a gap in the literature as to the physiological consequences of EIAH, and specifically acute cytokines and stress-related responses to hypoxemia during exercise. Exposure to hypoxic environments in which SaO2 is reduced and exercise can each, independently, alter/activate various pro- and anti-inflammatory markers and increases stress hormones. It follows then that EIAH athletes could be more susceptible to, and encounter more frequently, episodes of elevated levels of inflammatory cytokines and an exaggerated stress response than non-EIAH athletes; however, to the best of the investigators knowledge, this is yet to be confirmed. Therefore, it is hypothesized that highly trained endurance athletes who develop EIAH will experience more pronounced increases in inflammatory cytokines and stress hormones following a bout of heavy intensity exercise compared to athletes without EIAH.

Description:

Fifty highly trained endurance runners (men and women, age: 18-35 years) will be recruited for this study. The first testing session will serve as a screening tool to determine subject eligibility. Following the first testing sessions subjects will be divided into EIAH or non-EIAH groups based on SaO2 at VO2max (EIAH < 93%, non-EIAH > 95%; Dempsey and Wagner criteria). Subjects with intermediate SaO2 (93-95% at VO2max) values will be included in the study for correlational analyses only.

All subjects will be advised orally, and in writing, as to the nature of the experiments and will give written, informed consent to the study protocol.

Study Design & protocol:

Subjects will be asked to visit the Exercise Performance Laboratory at the Sylvan Adams Sports Institute on three occasions. During the first visit subject will perform resting pulmonary function tests (PFTs) followed by a graded exercise test to exhaustion on either a motorized-treadmill for the determination of VO2max, degree of EIAH (SaO2 at VO2max) and maximal heart rate (HRmax). On the second visit, subjects will perform PFTs, followed by a brief warm-up run for 10 min at a moderate intensity equivalent to 60% of HRmax, as obtained from the incremental test and a 30-min trial at either half-marathon pace (HM30), designed to simulate a tempo workout often practiced by endurance runners. The third visit, conducted 24 hours after the 30-min trial, will include a blood draw only.

Recruitment information / eligibility

• Status: Enrolling by invitation
• Enrollment: 50
• Est. completion date: September 1, 2024
• Est. primary completion date: May 1, 2024
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 35 Years

Eligibility

Inclusion Criteria:

• 1) Physically active (minimum of 50 km running/week) and maximal oxygen consumption > 55 and 50 ml/kg-1/min-1 for men and women, respectively.

• 2) classified as low risk based on a medical questionnaire, body mass index and non-smoking status.

• 3) No history of pulmonary, metabolic and/or cardiovascular disease.

• 4) normal pulmonary function as defined by a = 80% of predicted forced vital capacity (FVC), forced expired volume in one second (FEV1) and FEV1/FVC according the American Thoracic Society standards.

Exclusion Criteria:

• Smoking and/or any pulmonary, metabolic and/or cardiovascular disease.

• maximal oxygen consumption lower than set criteria.

Related Conditions & MeSH terms

• Exercise-induced Arterial Hypoxemia
• Hypoxia

Locations

Country	Name	City	State
Israel	Tel Aviv University	Tel Aviv

Sponsors (1)

Lead Sponsor	Collaborator
Gepner Yftach

Country where clinical trial is conducted

Israel, 

References & Publications (22)

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Constantini K, Tanner DA, Gavin TP, Harms CA, Stager JM, Chapman RF. Prevalence of Exercise-Induced Arterial Hypoxemia in Distance Runners at Sea Level. Med Sci Sports Exerc. 2017 May;49(5):948-954. doi: 10.1249/MSS.0000000000001193. — View Citation

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Romer LM, Dempsey JA, Lovering A, Eldridge M. Exercise-induced arterial hypoxemia: consequences for locomotor muscle fatigue. Adv Exp Med Biol. 2006;588:47-55. doi: 10.1007/978-0-387-34817-9_5. — View Citation

Weavil JC, Duke JW, Stickford JL, Stager JM, Chapman RF, Mickleborough TD. Endurance exercise performance in acute hypoxia is influenced by expiratory flow limitation. Eur J Appl Physiol. 2015 Aug;115(8):1653-63. doi: 10.1007/s00421-015-3145-5. Epub 2015 Mar 13. — View Citation

* Note: There are 22 references in all — Click here to view all references

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Inflammatory cytokines	Changes in Inflammatory cytokines (e.g. IL-6, IL-1b, IL-ra, IL-10)	Changes from baseline to immediately, 2 hour and 24 hour post 30 minutes run at half marathon pace (HM30)
Primary	Inflammatory cytokine	Changes in Inflammatory cytokine TNF-a	Changes from baseline to immediately, 2 hour and 24 hour post 30 minutes run at half marathon pace (HM30)
Primary	Changes in Cortisol level	Stress hormones	Changes from baseline to immediately, 2 hour and 24 hour post 30 minutes run at half marathon pace (HM30)
Primary	Changes in epinephrine level	Stress hormones	Changes from baseline to immediately, 2 hour and 24 hour post 30 minutes run at half marathon pace (HM30)
Primary	Changes in norepinephrine level	Stress hormones	Changes from baseline to immediately, 2 hour and 24 hour post 30 minutes run at half marathon pace (HM30)
Secondary	Changes in number of Neutrophiles		Changes from baseline to immediately, 2 hour and 24 hour post 30 minutes run at half marathon pace (HM30)
Secondary	Changes in number of lymphocytes		Changes from baseline to immediately, 2 hour and 24 hour post 30 minutes run at half marathon pace (HM30)
Secondary	Changes in number of monocytes		Changes from baseline to immediately, 2 hour and 24 hour post 30 minutes run at half marathon pace (HM30)
Secondary	Immune markers	Changes in basophiles count (number of)	Changes from baseline to immediately, 2 hour and 24 hour post 30 minutes run at half marathon pace (HM30)