Sports Science
Exercise Physiology
This guide helps you get your bearings in Exercise Physiology before you start exploring the interactive timeline, framework graph, and concept maps.
Before You Dive In
- Exercise physiology studies how the body responds and adapts to physical activity — it's the scientific foundation underneath sports training, rehabilitation, and public health recommendations.
- The field is organized around energy systems: the phosphocreatine system (immediate, ~10 seconds), anaerobic glycolysis (short-duration, ~2 minutes), and aerobic metabolism (sustained effort). Understanding when each dominates is fundamental.
- Start with the concept of VO2max (maximal oxygen uptake) — it's the single most studied variable in the field and the primary measure of cardiorespiratory fitness.
- The dose-response relationship between exercise and health outcomes is well-established but nonlinear — the biggest health gains come from moving from sedentary to moderately active.
- Modern exercise physiology increasingly integrates molecular biology (muscle signaling pathways, gene expression) with whole-body performance measurement.
Key Terms to Know
VO2maxThe maximum rate of oxygen consumption during intense exercise — the gold standard measure of aerobic fitness.
Lactate thresholdThe exercise intensity at which lactate accumulates faster than it can be cleared — a key predictor of endurance performance.
EPOCExcess post-exercise oxygen consumption — the elevated metabolic rate that persists after exercise ends.
Motor unit recruitmentThe process by which the nervous system activates muscle fibers in order from smallest to largest (Henneman's size principle).
PeriodizationThe systematic planning of training into phases (volume, intensity, recovery) to optimize adaptation and avoid overtraining.
SAID principleSpecific Adaptation to Imposed Demands — the body adapts specifically to the type of stress placed on it.
Common Confusions
Thinking "lactic acid causes muscle soreness" — lactate is cleared within an hour of exercise; delayed-onset soreness (DOMS) involves mechanical muscle damage.
Assuming more training always means better results — the principle of diminishing returns and the risk of overtraining syndrome are central to the field.
Confusing exercise physiology with sports science — exercise physiology is one discipline within sports science, which also includes biomechanics, psychology, and nutrition.
Recommended Reading
Exercise Physiology: Nutrition, Energy, and Human Performance— William D. McArdle, Frank I. Katch & Victor L. Katch
2014Physiology of Sport and Exercise— W. Larry Kenney, Jack H. Wilmore & David L. Costill
2019Endure: Mind, Body, and the Curiously Elastic Limits of Human Performance— Alex Hutchinson
2018How to Use the Interactive View
1
Explore the timeline
Open the interactive view and scan the framework timeline. Which frameworks came first? Which ones overlap? Where are the big transitions?
2
Read the articles
Click into individual frameworks to read what each one claims, where it came from, and how it relates to its neighbors.
3
Check the concept map
See how the key ideas within a framework connect. This is useful for figuring out what to learn first and what depends on what.
4
Test yourself
Take the quiz for any framework you've read about. It's a quick way to find out whether you actually understood the core ideas or just skimmed them.