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Smarter Training For Lasting Performance
Visualize your baseline physiology, dial-in your training
load and recovery
Cortisol is your body's built-in performance tool
Stress isn’t just pressure or burnout — it’s every rep, sprint, lift and drill your body powers through to trigger adaptation and increase strength.
Too little stress, and you don’t improve; too much, and you hit a wall. Understanding stress at the molecular level is key to elite performance.
Stress isn’t one dimensional - good or bad, it triggers a cascade of biochemical signals, with cortisol, inflammation and the immune system shaping the story.
Stress isn't the enemy. It's the signal
When you understand your body’s molecular response, you unlock a whole new level of control over your performance.
Understanding Your Molecular Response To Stress Means Knowing:
Understanding Your Molecular Response To Stress Means Knowing:
When stress is helping you build strength, endurance, and performance
When stress is tipping into overload, risking burnout, injury, or stagnation
How your body responds over time, so you're building and maintaining resilience
Saperex Cortisol Athlete
rest-day rhythm
training-day response
recovery trajectory
SapereX Cortisol Athlete is a two-day saliva test designed around training. You test on a rest day and a load day to see how you regulate and deploy energy. The results help you visualize baseline physiology, response to training, and recovery through molecular data.
Repeat testing across training blocks gives you the most meaningful insight, helping you confirm whether the adjustments you're making are moving you in the right direction.
The SapereX approach gives athletes, coaches, and other professionals objective data to guide programming, recovery planning, and performance optimization.
Discover Where You Stand
01
How is my body adapting to my training load?
02
Does my molecular profile show signs of over-training?
03
Do I have room to push harder?
Monitor Your Progress
01
Is my body continuing to adapt effectively to the demands of my training?
02
Did changes in my training regimen improve my molecular profile?
03
Am I physically and mentally prepared to take my program to the next level?
Built for Athletes & Performance Professionals
Designed for people who need molecular insights into training stress and recovery, including:
Competitive athletes- pro, collegiate, masters
Athletes increasing load or returning to training
Coaches, trainers, and other performance professionals
Performance and sports medicine clinics
From Order to Insight
01
Order - U.S. only
02
Collect saliva — 4 samples per day, across two days
03
Ship next day for analysis
04
Receive results in ~2 weeks
05
Retest in 8-12 weeks to compare patterns across training blocks
Advanced Option: SapereX Endurance
Available exclusively through clinical providers
SapereX Endurance is our most comprehensive assessment, integrating cortisol profiling with advanced immune resilience and cellular senescence measures
SapereX Endurance is ideal when:
Clinicians want to evaluate immune resilience alongside stress physiology
Training load is high and long-term physiological resilience is a concern
Recovery issues persist despite training and lifestyle changes
Compare SapereX Assessments
SapereX Longevity
SapereX Cortisol Athlete
SapereX Endurance
Sample type
Blood
Saliva
Measurements
Advanced immune testing
Cortisol response testing
Primary audience
Clinicians
Individuals
Clinicians
Region
US and EU
US only
US only
Key References
- Miller R, et al. The CIRCORT database: Reference ranges and seasonal changes in diurnal salivary cortisol derived from a meta-dataset comprised of 15 field studies. Psychoneuroendocrinology. 2016.
- Anderson T, Wideman L. Exercise and the Cortisol Awakening Response: A Systematic Review. Sports Medicine. 2017.
- MacDonald D, Wetherell MA. Competition Stress Leads to a Blunting of the Cortisol Awakening Response in Elite Rowers. Front Psychol. 2019.
- Anderson T, et al. Examining Internal and External Physical Workloads Between Training and Competitive Matches Within Collegiate Division | Men's Soccer. J Strength Cond Res. 2021.
- Anderson T, et al. The impact of prior day sleep and physical activity on the cortisol awakening response. Psychoneuroendocrinology. 2021.
- Minetto MA, et al. Changes in awakening Cortisol response and midnight salivary Cortisol are sensitive markers of strenuous training-induced fatigue. J Endocrinol Invest. 2008.
- Anderson T, et al. The e-ect of acute exercise on the cortisol awakening response. Eur J Appl Physiol. 2023.
- Chellappa SL. "Individual di-erences in light sensitivity a-ect sleep and circadian rhythms", Sleep. 2021
- Petrowski K, et al. "The E-ects of Post-Awakening Light Exposure on the Cortisol Awakening Response in Healthy Male Individuals", Psychoneuroendocrinology. 2019
- Brown TM., et al. "Recommendations for Daytime, Evening, and Nighttime Indoor Light Exposure to Best Support Physiology, Sleep, and Wakefulness in Healthy Adults", , PLOS Biology. 2022
- Wilhelm 1, et al. "Is the Cortisol Awakening Rise a Response to Awakening?", Psychoneuroendocrinology. 2007
- Athanasiou N., Matos, N. "Endocrine Responses of the Stress System to Di-erent Types of Exercise", Reviews in Endocrine and Metabolic Disorders. 2022
- Gavrieli A, et al. "Caffeinated Coffee Does Not Acutely Affect Energy Intake, Appetite, or Inflammation but Prevents Serum Cortisol Concentrations from Falling in Healthy Men", , The Journal of Nutrition. 2011
- Lovallo WR., et al. "Ca-eine Stimulation of Cortisol Secretion Across the Waking Hours in Relation to Ca-eine Intake Levels", Psychosomatic Medicine. 2005
- Chandrasekha K, et al. "A Prospective, Randomized Double-Blind, Placebo-Controlled Study of Safety and Ecacy of a High-Concentration Full-Spectrum Extract of Ashwagandha Root in Reducing Stress and Anxiety in Adults", Indian Journal of Psychological Medicine. 2012
- Weakley J, et al. "Overtraining Syndrome Symptoms and Diagnosis in Athletes: Where Is the Research? A Systematic Review", International Journal of Sports Physiology and Performance. 2022
- Kreher JB, Schwartz, JB. "Overtraining Syndrome: A Practical Guide". , Sports Health. 2012
- Winsley R, Matos N. "Overtraining and Elite Young Athletes", Medicine and Sport Science. 2011
- Symons IK, et al. "Impact of Overtraining on Cognitive Function in Endurance Athletes: A Systematic Review", Sports Medicine. 2023