Clinical trial NCT04817280: COVID-19 in Polish Ice Swimmers.
Official title: Influence of Ice Swimming on Hardening Against SARS-CoV-2 and Influence of AB0 Rh Blood Type on Viral Resistance in Polish Ice Swimmers.
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Covid19
SARS-CoV Infection
Resistance, Disease
Hypothermia
Hypothermia Due to Cold Environment
Keywords: Ice Swim
Immune System
Immunity
Temporarily cooling down
Lead sponsor: Wroclaw Medical University
Sponsor class: OTHER
First posted: 2021-03-26
Enrollment: 2534
Sex: ALL
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Observational model: CASE_CONTROL
Time perspective: RETROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Surveys are distributed en masse among ice swimmers from Poland. Comparative data for the control group is derived from officially published national and regional pandemic data.

Brief summary: Ice swimming is an increasingly common phenomenon in Poland. It has been confirmed that it has a beneficial effect on health by increasing the natural non-specific immunity to infections. In the face of the current Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) pandemic causing Coronavirus Disease 2019 (COVID-19), researchers decided to use a survey to check the incidence of COVID-19 among Polish ice swimmers, as well as recent ailments. Then, the researchers will compare the obtained results with epidemiological data for Poland.Researchers will also investigate the relationship between susceptibility to SARS-CoV-2 infection and the blood group and Rh factor among ice swimmers.

Detailed description: The research tool is an original questionnaire compiled by a team of experts conducting the study. The survey includes questions about sociodemographic data, such as age and gender and blood type in AB0 system with Rh factor, and questions about the frequency of ice swimming, the duration of a single session, and since when respondents have been ice swimming. There was also a question about the respondents' compliance with the restrictions and recommendations related to the pandemic and contacts with people with confirmed SARS-CoV-2 infection. In the survey, researchers ask about the infectious symptoms experienced during the pandemic and about being diagnosed with COVID-19 or its exclusion. People who have been ill are asked about the place of treatment.

The questionnaires are collected in traditional form, on the Internet and as scans of documents. Each survey was completely anonymous. The obtained statistical data will be compared with official data on new COVID-19 cases and recoveries at the same time. Official data are published by the Ministry of Health and earlier also by Sanitary and Epidemiological Stations. The main aim of the study was to determine whether ice swimming also increases resistance to SARS-CoV-2 and COVID-19.

Eligibility criteria: Inclusion Criteria:

* ice swimmers

Exclusion Criteria:

* not active ice swimmers

Primary outcomes:
measure: Assessment of the incidence of COVID-19 among ice swimmers compared to the general population.
timeFrame: 47 days.
measure: Assessment of the frequency of asymptomatic SARS-CoV-2 infection among ice swimmers compared to the general population.
timeFrame: 47 days.
measure: Assessment of the frequency of occurrence of particular symptoms of SARS-CoV-2 infection among ice swimmers compared to the general population.
timeFrame: 47 days.
measure: Assessment of the frequency of COVID-19 treatment in an outpatient, inpatient and intensive care unit among ice swimmers compared to the general population.
timeFrame: 47 days.
measure: Assessment of the impact of parameters and ice swimming strategies on the likelihood of developing COVID-19, the occurrence of individual symptoms of the disease and the severity of its course.
timeFrame: 47 days.
measure: Assessment of the influence of blood group on susceptibility to SARS-CoV-2 infection among ice swimmers.
timeFrame: 47 days.
Secondary outcomes:
measure: Assessment of the immunity of the ice swimmer's immune system compared to the general population.
timeFrame: 47 days.
Other outcomes:
Locations:
city: Wrocław
country: Poland
facility: Department of Public Health at Wroclaw Medical University
state: Dolny Slask
city: Gorzów Wielkopolski
country: Poland
facility: Department of Radiotherapy of Multidisciplinary Provincial Hospital
state: Lubuskie
city: Zielona Góra
country: Poland
facility: Treasury Medical Company
state: Lubuskie
Study officials:
affiliation: Department of Pharmacology and Toxicology, Medical University of Zielona Gora
name: Sylwia Sulimiera Michalak, MD, PhD
role: STUDY_DIRECTOR
affiliation: Department and Center of Radiotherapy, Multidisciplinary Provincial Hospital in Gorzow Wielkopolski
name: Edyta Wolny-Rokicka, MD, PhD
role: STUDY_DIRECTOR
affiliation: Department of Public Health, Wroclaw Medical University
name: Andrzej Tukiendorf, Prof.
role: STUDY_CHAIR
affiliation: Department of Family Medicine, Wroclaw Medical University
name: Lukasz K Wysoczanski, MD
role: PRINCIPAL_INVESTIGATOR
affiliation: Department of Family Medicine, Wroclaw Medical University
name: Paulina N Wysoczanska, MD
role: PRINCIPAL_INVESTIGATOR
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