Skip to content
The Scientist’s Notebook
Research-backed training insights for endurance athletes.

What readers say

Stopped using FTP alone after reading the lactate thresholds article. Ursula (33), Switzerland
The CP/W′ calculator matched my field test within ~5 W. Javier (42), Spain
The only place I’ve seen practical protocols without influencer noise. Max (25), Germany

Join the community of evidence-based athletes.

Latest

27
Jul
#Entry 031: Load Balance, Decoded: What Tomorrow's Workout Should Actually Look Like

#Entry 031: Load Balance, Decoded: What Tomorrow's Workout Should Actually Look Like

You looked at your dashboard this morning. Load Balance reads −18. Your training plan says hard intervals. Your legs say
7 min read
24
Jul
Snippet #028: Capillary Density and the Last Mile of Oxygen Delivery

Snippet #028: Capillary Density and the Last Mile of Oxygen Delivery

Endurance training stimulates angiogenesis, the growth of new capillaries (the smallest blood vessels) around muscle fibers. Studies show the number
2 min read
20
Jul
Entry #030: The two lactate thresholds (LT1/LT2) — The Dual-Threshold Metabolic Architecture

Entry #030: The two lactate thresholds (LT1/LT2) — The Dual-Threshold Metabolic Architecture

As an endurance practitioner, you have likely structured training around a singular metric: the lactate threshold. This pervasive concept—often
7 min read
17
Jul
Snippet #027: Your Energy Systems Run Together, Not in Sequence

Snippet #027: Your Energy Systems Run Together, Not in Sequence

The aerobic and oxygen-independent pathways of energy production operate simultaneously from the first second of exercise. Their relative share
2 min read
15
Jul
Dr. Sebastian Sitko — OpenLab on allostatic load

OpenLab #008: Allostatic Load: The Hidden Stress Budget in Endurance Training

Guest OpenLab with Dr. Sebastian Sitko: why the stress you do not train, work, sleep loss, travel, life, lands in your legs, and how to read your full allostatic budget.
19 min read
13
Jul
Entry #029: How to Read Your Power-Duration Curve, A Scientist's Walkthrough

Entry #029: How to Read Your Power-Duration Curve, A Scientist's Walkthrough

The single chart that compresses your entire physiology into one line. Here's how to read it without the jargon.
7 min read
10
Jul
Snippet #026: Strategic Fiber Intake Stabilizes Energy by Slowing Gastric Emptying

Snippet #026: Strategic Fiber Intake Stabilizes Energy by Slowing Gastric Emptying

Dietary fiber acts as a structural and viscous matrix in the digestive tract, attenuating the rate at which chyme leaves
2 min read
08
Jul
OpenLab #007: Gut training and the unfinished science of fueling with Dr. Emily Dow

OpenLab #007: Gut training and the unfinished science of fueling with Dr. Emily Dow

Picture an age group triathlete arriving at a sports-nutrition lab convinced that gels caused her cramps during her A-
14 min read
06
Jul
Entry #028: Block and reverse periodization vs traditional + polarized

Entry #028: Block and reverse periodization vs traditional + polarized

The way we organize training stress—periodization—remains a hot topic in exercise science. While the goal is to adjust
7 min read
03
Jul
Snippet #025: Gut Colonization Delays Fatigue by Preserving Carbohydrate Availability During Endurance Efforts

Snippet #025: Gut Colonization Delays Fatigue by Preserving Carbohydrate Availability During Endurance Efforts

Specific gut bacteria typically require a prolonged supplementation period of six to twelve weeks to induce functional shifts within the
1 min read