This case report describes a 49 year old woman who had suffered from asthma since her teenage years that resolved after she took up regular open water swimming. After sharing this case report with an international open water swimming community on social media, over one hundred people with asthma commented that their symptoms had also improved after taking up this activity. The mechanism whereby open water swimming might alleviate asthma has not been established. Possibilities include benefits to mental health, anti-inflammatory effects, being more fit, improved immune function and suppression of the bronchoconstrictive component of the diving reflex. Further research might usefully confirm or refute these clinical observations.
Originally published on https://www.frontiersin.org/articles/10.3389/fmed.2023.1169639/full.
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CHILL CIC commissioned the University of Portsmouth to provide feedback from participants relating to outdoor swimming coaching sessions that were conducted for NHS staff as part of the NHS Improvement and wellbeing. The courses took place in London at Parliament Hill Lido and in Cornwall.
The outdoor swimming courses consisted of 8 sessions, each session was up to 1 hour in length. The sessions were supported by qualified and experienced open water swimming coaches and lifeguards.
Background: Outdoor swimming is increasingly popular, with enthusiasts claiming benefits to mental health. However, there is limited research into its effectiveness as an intervention for people with depression and/or anxiety. We aimed to establish recruitment rates and explore potential benefits, for a sea swimming course offered to people with depression and/or anxiety.
Methods: This was a singlearm, unblinded feasibility study. 61 participants, were recruited to an eight-session sea-swimming course. Attendance rates were recorded. Self-administered questionnaires were completed at baseline, post-course and at three-month follow-up. Free-text descriptions of thoughts about the course were collected using surveys, and 14 participants kept a diary.
Results: 53 participants (47 female, 5 male, 1 non-binary) were included in the final analysis. Overall attendance was 90.1%. There were reductions showing large effect (between d = 1.4 to 1.7) in the severity scores of both depression and anxiety between the beginning and end of the course. While severity scores marginally increased at three-month follow-up, a reduction from baseline scores for depression, anxiety (d = 1.2 and 1.4, respectively) and functioning scores (d = 0.8) remained. The qualitative analysis identified that ‘confronting challenges’, ‘becoming a community’ and ‘appreciating the moment’ were key to the impact, or the ’mechanisms’, that resulted in participants experiencing the ’outcomes’ of ‘immediate positive changes in mood’, ‘improved mental and physical health’ and ‘increased motivation to swim’.
Conclusions: This study provides preliminary support for the engagement and acceptability of sea swimming as a novel intervention for depression and/or anxiety. Participants reported positive changes in mental health, indicating the intervention’s potential as a public health resource. There was a clear gender difference, which requires further exploration. Larger scale trials are warranted.