From Load to Strain: Dr. Stephen Seiler's Latest Research p.2

In this insightful episode of Athlete’s Compass, Dr. Stephen Seiler joins hosts Paul Laursen, Marjaana Rakai, and Paul Warloski for a deep conversation on breathing as a training tool, recovery as a performance enhancer, and the importance of individualizing endurance training. From nasal-only breathing sessions to the role of sentiment analysis in monitoring strain, the discussion blends science, practicality, and humility. Dr. Seiler encourages athletes—especially the high-performing overachievers—to embrace rest, experiment with their own training, and use available tools (like AI and wearables) to make smarter, more personalized decisions.

Key Takeaways

• Nasal breathing can be a powerful training tool.
• The respiratory system is trained during high-intensity work—specialized breathing sessions may be unnecessary for some.
• Nasal-only breathing can increase ventilatory efficiency and reduce total ventilation needs.
• Training responses are highly individual—what works for one may not work for another.
• Sentiment analysis (language used in training logs) can reveal internal strain and should be integrated with other metrics.
• AI and wearables are enabling athletes to treat themselves as “n=1” experiments.
• The key to successful endurance performance: managing the balance between signal and strain.
• Coaches and athletes should adopt a "triangulation" model: training load, physiological feedback, and perceived effort.
• Rest is a performance enhancer, not a weakness.

• Training adaptation and heart rate variability in elite endurance athletes: opening the door to effective monitoring - PubMed
• Reward and Forgiveness: discussing training with champion speed skater Nils van der Poe
• Paul Warloski - Endurance, Strength Training, Yoga
• Marjaana Rakai - Tired Mom Runs - Where fitness meets motherhood.