Impact of Prolonged Cold-water Swimming on Heart Rate and Cardiac Function

NCT06296290 | Completed

• 1 other identifier: CARDIOCOLD
• Study Type: observational
• Target: 20
• Locations: 1 country
• Sites: 1

Brief Summary

A significant medical risk associated with hypothermia during exercise in a cold environment cardiac arrhythmia due to a possible autonomic conflict. However, little is known about the changes in heart rate and cardiac function after prolonged cold water swimming. The investigators propose to measure the changes in core temperarure during and after a cold water swim at at a water temperature below 15.5°C qualifying for English Channel swim and to test the association with changes in heart rate variability, resting electrocardiogram and left ventricle function.

Conditions

Hypothermia

Outcome Measures

Primary Outcomes (4)

• Heart rate from a resting ECG recording

  Waves, intervals \& segments of the normal ECG trace was collected

  Two Time points (1) the day before the race and (2) at 30 min after ending the race

• Heart rate from a 5-minute ECG recording

  Heart rate variability (HRV) parameters including time-domain measures and frequency-time measures

  Two Time points (1) the day before the race and (2) at 30 min after ending the race

• Transthoracic echocardiography (TTE) analysis

  Left and right ventricular and atrial dimensions, and systolic and diastolic ventricular function assessment were collected

  Two Time points (1) the day before the race and (2) at 30 min after ending the race

• Change in Body Core Temperature

  Measurement of Body Core Temperature using an ingestible electronic sensor (e-Celsius®, BodyCap , Caen, France) which provide a continuous validated measurement

  Time Frame: Continuous measurement was collected from 30 minutes before the race until 2 hours after the end of the race for each swimmer]

Secondary Outcomes (6)

• Body composition, body fat mass

  One measurement assessed the day before the race

• Body composition, fat-free mass

  One measurement assessed the day before the race

• Duration

  The duration of swimming was collected from the organisers immediately after the race

• Individual characteristics, gender

  One evaluation assessed the day before the race

• Individual characteristics, age

  One evaluation assessed the day before the race

Study Arms (1)

All participants

The participants are the swimmers engaged in the 6-hour cold water swim during the Channel Swim Camp who volunteered to participate in the study.

Eligibility Criteria

• Age: 18 Years - 65 Years
• Sex: all
• Age Groups: Adult (18-64), Older Adult (65+)
• Sampling Method: Probability Sample

Study Population

Swimmers participating in the 6-hour cold-water swim, qualifying for the English Channel swim at the Channel Swim Camp (Dinard, France).

You may qualify if:

• swimmers taking part in the Channel Swim Camp
• swimmers above 18 years of age
• swimmers willing and able to give informed consent for participation in the study

You may not qualify if:

• swallowing disorder
• chronic gastrointestinal disease
• MRI scheduled within 48 hours after the race.
• known cardiac arythmia or cardiovascular disease

Sponsors & Collaborators

• University Hospital, Caen: lead

Study Sites (1)

CHU Caen Normandie

Caen, 14000, France

Location

MeSH Terms

Conditions

Hypothermia

Condition Hierarchy (Ancestors)

Body Temperature Changes; Signs and Symptoms; Pathological Conditions, Signs and Symptoms

Study Design

• Study Type: observational
• Observational Model: COHORT
• Time Perspective: PROSPECTIVE
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: February 29, 2024
• First Posted: March 6, 2024
• Study Start: June 4, 2022
• Primary Completion: June 6, 2022
• Study Completion: August 15, 2022
• Last Updated: September 19, 2024

Record last verified: 2024-02

Locations

FR (1)