Key result
In an elite open-water swimmer, increasing Zone 2 training volume improved parasympathetic indices, while Zone 1 training reduced sympathetic activity over a 19-week period.
Population
1 elite 25-km open-water swimmer
Design
Case study
Follow-up
19 weeks
Authors
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No immediate practice change from this single case; leaves open whether Zone 2 volume preferentially enhances parasympathetic activity in elite swimmers.
Case Report (n=1)
No
In an elite ultra-endurance swimmer, increasing Zone 2 training volume improved cardiac parasympathetic activity, while Zone 1 training reduced sympathetic activity.
Pla et al. (2019) conducted a case report in Elite ultra-endurance swimmer (n=1). Ultra-endurance swimming training was evaluated on Heart rate variability (HRV) changes. In an elite open-water swimmer, increasing Zone 2 training volume improved parasympathetic indices, while Zone 1 training reduced sympathetic activity over a 19-week period.
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