Determining the effects of vegan and omnivorous diets on the effects of exercise and the intestinal bacteria population in ultra-marathoners

ISRCTN ISRCTN69541705
DOI https://doi.org/10.1186/ISRCTN69541705
Secondary identifying numbers 2013-KAEK-64
Submission date
27/10/2020
Registration date
08/12/2020
Last edited
18/07/2023
Recruitment status
No longer recruiting
Overall study status
Stopped
Condition category
Other
Prospectively registered
Protocol
Statistical analysis plan
Results
Individual participant data
Record updated in last year

Plain English Summary

Background and study aims
The gut microbiome is the totality of microorganisms, bacteria, viruses, protozoa, and fungi, and their collective genetic material present in the gastrointestinal tract.
Vegan diets have been widely adopted in the athletic population in recent years. However, the influence of vegan diets on exercise performance and energy processing (metabolism) is still controversial.
The study aims to determine gut microbiome adaptation to extreme endurance exercise according to vegan or omnivore diet consumed in ultra-marathoners. We also seek to evaluate long-term vegan and omnivore diets' effects on exercise capacity, oxidant/antioxidant capacity, muscle fatigue, and assess energy availability

Who can participate?
Ultra-marathoners with age between 18 to 49 years who are competing in the Sri-Chinmoy ultra-marathon race

What does the study involve?
Our study will run for one year. During this period, research data will be collected from the participants in four steps (three visits to the research laboratory and the race day) throughout the study. Study participants will be asked to visit the study laboratory for three times (first and second visits before the race and the third visit 24 hours after the race).

What are the possible benefits and risks of participating?
Participants will receive reliable information about their nutrition and performance status from health professionals.
There are no additional risks.

Where is the study run from?
1. University Hospital of Zurich (Switzerland)
2. Sri-Chinmoy race (St. Jakob sports complex) (Switzerland)

When is the study starting and how long is it expected to run for?
January 2020 to September 2023 (updated 22/07/2022, previously: September 2022; updated 13/04/2021, previously: May 2021)

Who is funding the study?
University Hospital of Zurich (Switzerland)

Who is the main contact?
Prof Beat Knechtle, beat.knechtle@hispeed.ch
Dr Asli Devrim Lanpir, asli.devrim@medeniyet.edu.tr

Contact information

Prof Beat Knechtle
Scientific

Säntisstrasse 8
Freidorf TG
Zurich
9306
Switzerland

ORCiD logoORCID ID 0000-0002-2412-9103
Phone +41-(0)-71-226-93-00
Email beat.knechtle@hispeed.ch
Dr Asli Devrim Lanpir
Scientific

22 Istiklalim Street
Altıntepe
Maltepe
Istanbul
34840
Türkiye

ORCiD logoORCID ID 0000-0002-4267-9950
Phone +90-(0)-216-280-33-33/ 4150
Email asli.devrim@medeniyet.edu.tr

Study information

Study designBefore and after study design
Primary study designInterventional
Secondary study designBefore and after study design
Study setting(s)Other
Study typeOther
Participant information sheet Not available in web format, please use the contact details to request a patient information sheet.
Scientific titleVegan vs. omnivore diets paradox: Determining the effects of dietary pattern on exercise-induced symptoms and a whole-metagenomic approach towards defining metabolic networks during the race in ultra-marathoners
Study hypothesis1. According to gut metagenomics, vegan ultra-marathoners have higher alpha and beta diversity than omnivorous ultra-marathoners
2. Vegan ultra-marathoners have lower energy availability, macro- and micronutrient intakes than omnivore ultra-marathoners
2. Ultra-marathoners following a long-term vegan diet have a higher antioxidant capacity, lower oxidant capacity, and muscle fatigue than omnivorous ultra-marathoners
3. There is no difference between vegan and omnivorous ultra-endurance athletes in terms of gut microbiome adaptation to ultra-marathon races
Ethics approval(s)Approved 24/06/2020, Istanbul Medeniyet University Göztepe Training and Research Hospital Clinical Research Ethics Committee (Doktor Erkin Street, Kadıköy / Istanbul, Turkey; +90216570 9190; etik@sbgoztepehastanesi.gov.tr), ref: 2020/0396
ConditionUltra-marathoners adhering to a vegan or omnivorous diet at least 6 months
InterventionParticipants will be classified as either vegan (no type of animal product consumption - dietary adherence <6 months) or omnivorous (consumption of any animal products - dietary adherence <6 months) based on self-reporting of diet consumed.

Twenty four participants will be assigned to the study, including twelve vegan and twelve omnivorous ultra-marathoners competing in the Sri-Chinmoy ultra marathon race. Research data will be collected at the University of Zurich Research Laboratory between June 2021 and August 2021, and on the Sri-Chinmoy ultra-marathon race day in July 2021. Research data will be collected from the participants at four steps (three visits to the research laboratory and the race day) throughout the study. At the first visit, fecal samples, and anthropometric measurements will be collected. Body composition will be measured using DXA. Participants will be informed about keeping detailed food and liquid records and will be asked to record their diet data during the study period. Additionally, they will be asked to wear accelerometers during this period. At second visit, maximum oxygen consumption will be measured on a treadmill. At the race day, blood samples will be collected immediately before, and 0. min, two hours, and 24 hours before the race. The blood and fecal samples will be stored at -80 C until analysis. Plasma malondialdehyde, reactive oxygen metabolites (d-ROMs), total antioxidant capacity, and HSP70, and serum Orosomucoid 1 will be analyzed in blood samples. Fecal samples will be analyzed with shotgun metagenomic analysis and interpreted using the bioinformatics pipeline (HumanN2). Statistical tests will be analyzed using SPSS version 23.0 (IBM, Armonk, NY) and R Software (Dusseldorf, Germany). Laboratory analyses will be covered by the Institute of Primary Care, University Hospital Zurich.

Individual results of the VO2max values, nutritional assessment according to food and fluid records, energy availability, body mineral density, and microbiota structure will be discussed in detail with the participants. Further, they will receive individual consultations on obtaining adequate energy and nutrient intake. As a result of this study, participants will receive reliable information about their nutrition and performance status from health professionals.
The increase of heart rate during the incremental running test will be continuously monitored in order to prevent an adverse reaction, and only healthy participants with no history of cardiovascular disease will be invited to participate in the study. The Physical Activity Readiness Questionnaire (PAR-Q) will be applied to assess current cardiovascular health. Participants answering no to all questions will be considered as eligible for physical activity. The standard emergency equipment will be available in the research laboratory. Blood samples will be collected by a healthcare professional while the participants are positioned in a semi-reclined position to avoid risks associated with blood collection. Lactate measurements will be performed using sterile lancets to prevent risk of exposure to bloodborne pathogens.
Intervention typeOther
Primary outcome measureIntestinal microbial adaptation according to applied diet evaluated by analysing faecal samples taken seven days before and seven days after the race using shotgun metagenomic analysis
Secondary outcome measuresOxidative stress and muscle fatigue-related biomarkers measured using blood samples immediately before, at the end of 0 h, 2 h and 24 h of the race
Overall study start date01/01/2020
Overall study end date30/09/2023
Reason abandoned (if study stopped)Objectives no longer viable

Eligibility

Participant type(s)Healthy volunteer
Age groupAdult
Lower age limit18 Years
Upper age limit49 Years
SexBoth
Target number of participants24
Participant inclusion criteria1. Ultra-marathoners with age between 18 to 49 years
2. Competing in the Sri-Chinmoy ultra-marathon race
3. No use of probiotics and antibiotics in the preceding 3 months
4. No history of acute or chronic illnesses
Participant exclusion criteriaDoes not meet inclusion criteria
Recruitment start date01/01/2021
Recruitment end date21/07/2023

Locations

Countries of recruitment

  • Switzerland

Study participating centres

University Hospital Zurich
Institute of Primary Care
Zurich
8091
Switzerland
Sri-Chinmoy race (St. Jakob sports complex)
Brüglingerstrasse 21
Basel
4052
Switzerland

Sponsor information

University Hospital of Zurich
Hospital/treatment centre

Institute of Primary Care
Zurich
8091
Switzerland

Phone +41 44 634 11 11
Email anke.schickel@uzh.ch
Website http://www.en.usz.ch/Pages/default.aspx
ROR logo "ROR" https://ror.org/01462r250

Funders

Funder type

Hospital/treatment centre

Universitätsspital Zürich
Government organisation / Local government
Alternative name(s)
University Hospital Zurich, USZ
Location
Germany

Results and Publications

Intention to publish date01/01/2024
Individual participant data (IPD) Intention to shareYes
IPD sharing plan summaryOther
Publication and dissemination planPlanned publication in a high-impact peer-reviewed journal.
IPD sharing planAll data generated or analysed during this study will be included in the subsequent results publication.

Study outputs

Output type Details Date created Date added Peer reviewed? Patient-facing?
Protocol article protocol 23/09/2021 24/09/2021 Yes No

Editorial Notes

18/07/2023: The study was stopped.
22/07/2022: The following changes have been made:
1. The recruitment end date has been changed from 21/07/2022 to 21/07/2023.
2. The overall trial end date has been changed from 30/09/2022 to 30/09/2023 and the plain English summary has been updated to reflect this change.
3. The intention to publish date has been changed from 01/01/2023 to 01/01/2024.
24/09/2021: Publication reference added.
13/04/2021: The following changes were made to the trial record:
1. The recruitment end date was changed from 21/04/2021 to 21/07/2022.
2. The overall end date was changed from 30/05/2021 to 30/09/2022.
3. The intention to publish date was changed from 01/05/2022 to 01/01/2023.
4. The plain English summary was updated to reflect these changes.
10/11/2020: Trial’s existence confirmed by Istanbul Medeniyet University Göztepe Training and Research Hospital Clinical Research Ethics Committee.