CSCS Chapter 12 Study Guide

Performance-Enhancing Substances and Methods

This is my Chapter 12 CSCS study guide for Performance-Enhancing Substances and Methods. The big themes are legality, safety, scope of practice, mechanism of action, performance effect, and the downside hiding in the fine print.

This guide is designed as a quick-reference review, not medical, legal, anti-doping, or individualized supplement advice.

One-Page High-Yield Snapshot

1. Drug vs Dietary Supplement

The first first trap is that the distinction is not always intuitive. A compound can feel ordinary because it appears in foods or drinks, but still be treated as a drug in the chapter context. Caffeine is the classic example: common in coffee and energy drinks, but categorized as a drug in these notes because it changes physiologic function and arousal.

Drug: generally subject to stricter approval/testing standards when intended to treat disease or alter body function pharmacologically.

Dietary supplement: a product intended to supplement the diet and containing dietary ingredients such as vitamins, minerals, herbs/botanicals, amino acids, or other dietary substances. It must be labeled as a dietary supplement and should not be confused with food or assumed to have positive nutritional value simply because it is sold as a supplement.

DSHEA and Manufacturer Responsibility

Under DSHEA, dietary supplement manufacturers/distributors are responsible for evaluating safety and labeling before marketing. They may make structure/function claims when truthful and not misleading, but the standard is less stringent than drug approval.

The exam may ask this backwards: the false statement is that dietary supplements must meet FDA standards for safety and effectiveness before being sold. They do not. Also remember that products can be contaminated or mislabeled, which creates health and eligibility risk for athletes.

2. Doping Policies and Banned Lists

World Anti-Doping Agency (WADA) is treated as the most widely recognized international organization regulating doping and maintaining an international prohibited list. Countries may have affiliated anti-doping agencies, such as USADA in the United States.

For collegiate sport, NCAA rules matter. The key emphasis is that that the NCAA list is updated annually, is not exhaustive, and does not include every possible banned substance. Supplements can contain prohibited substances that are not listed on the label.

3. Ergogenic Aids: Definition and Coach Responsibility

An ergogenic aid is any substance, mechanical aid, or training method used to increase performance. The practical hierarchy is: training and periodization first, sound nutrition second, supplements last and only when legality/safety/evidence are clear.

Strength and conditioning professionals should know benefits, symptoms and signs of abuse for common ergogenic aids, but they should not diagnose or treat substance abuse. Recognize red flags, refer appropriately, and never recommend banned substances.

4. Anabolic-Androgenic Steroids (AAS)

Anabolic-androgenic steroids are synthetic derivatives of testosterone. “Anabolic” refers to tissue-building/protein-synthesis effects; “androgenic” refers to masculinizing sex characteristics. The primary performance goal is increased muscle protein synthesis, muscle mass, body mass, and strength.

Examples to recognize: testosterone esters, trenbolone acetate, nandrolone esters, methandrostenolone/Dianabol, stanozolol/Winstrol, oxandrolone/Anavar, Sustanon, oxymetholone, and mesterolone.

Administration Patterns

Common patterns include oral and injectable use, stacking multiple substances, cycling on and off, and pyramiding doses up and down. The notes athlete abuse doses may be roughly 5 to 29 times physiologic replacement dosing.

Stacking means taking multiple drugs simultaneously in hopes of additive effects. The notes stacking efficacy is not proven, even though the practice is common.

Performance Effects

• Increased concentration of testosterone stimulates protein synthesis.
• Increases in muscle mass and strength are expected effects.
• Lean mass gains may persist for several months after stopping.
• Some notes describe 2 to 3 times higher gains in trained individuals using steroids compared with non-users.

Adverse Effects of AAS Abuse

5. Other Hormonal or Drug-Based Ergogenic Aids

Testosterone Precursors / Prohormones

Prohormones are precursors to hormone synthesis and are taken in hopes of increasing testosterone and anabolic effects. The key takeaway is that they are relatively weak androgenic compounds at manufacturer-recommended doses and do not appear to enhance resistance-training adaptations at those doses. They are also banned and carry risk.

SARMs

Selective androgen receptor modulators are tissue-selective androgen receptor agonists marketed in “supplement-like” spaces, but the chapter treats them as a major red flag. They are prohibited for athletes under WADA and investigated as drugs, not dietary supplements. The key practical risk is unlabeled, mislabeled, or contaminated products.

Human Chorionic Gonadotropin (hCG)

hCG is associated with the placenta/pregnancy testing and is closely related to luteinizing hormone. In sport, male steroid users may use it at the end of a cycle to attempt to restore endogenous testosterone production. The notes also mention hCG sometimes being prescribed medically in weight-loss settings, but it is not a “fat-loss injection” mechanism for athletes.

Insulin

Insulin is anabolic because it facilitates uptake of glucose and amino acids and can support increases in muscle protein synthesis while limiting breakdown. The major danger of injecting insulin in a healthy athlete is severe hypoglycemia, which can cause coma or death.

Human Growth Hormone (hGH)

hGH is secreted by the anterior pituitary and is linked to muscle and connective tissue growth. It must be injected to be effective and cannot be detected in urine; detection requires blood testing. High-dose use is associated with acromegaly/gigantism-type effects, wider bones, enlarged organs, arthritis, diabetes, cardiovascular dysfunction, pain, hypertension, and osteoarthritis.

6. Blood Doping and Erythropoietin (EPO)

EPO is produced in the kidneys and stimulates red blood cell production. Misuse can involve recombinant EPO injections or blood transfusion methods. Blood doping methods include autologous transfusion (own stored blood) and homologous transfusion (another person’s same-type blood).

7. Beta Agonists and Beta Blockers

Beta-Adrenergic Agonists and Clenbuterol

Beta-agonists are chemically related to epinephrine and may influence lipolysis and thermogenesis. They were originally developed for asthma/bronchodilation. Clenbuterol is discussed as being abused for repartitioning effects: attempting to increase lean tissue and reduce fat/subcutaneous fat. Reported adverse effects include tachycardia, hyperthermia, tremors, dizziness, palpitations, and insomnia.

Beta Blockers

Beta blockers prevent epinephrine and norepinephrine from binding to beta-adrenergic receptors. They reduce heart rate, blood pressure, anxiety, and tremor. That can help precision sports requiring calm and steadiness, such as rifle, archery, marksmanship, and biathlon.

They can be ergolytic in endurance or high-output sports because they blunt heart-rate response and oxygen consumption, reduce bronchoresponsiveness, increase perceived exertion, and may impair performance.

8. Alcohol and Performance

Acute alcohol can impair fine motor control, reaction time, judgment, and arousal. Recovery-wise, alcohol can impair skeletal muscle metabolism, exacerbate strength loss after eccentric exercise, disrupt sleep-related autonomic function, and reduce mTORC1 phosphorylation and muscle protein synthesis.

The main exam reason to avoid alcohol post-training is that it interferes with recovery processes and muscle protein synthesis.

9. Dietary Supplements and Nutritional Ergogenic Aids

Essential Amino Acids, BCAAs, and Leucine

Essential amino acids must be obtained from the diet. BCAAs include leucine, isoleucine, and valine. Leucine is the key stimulator of muscle protein synthesis through the mTOR pathway.

Exam trap: leucine stimulates muscle protein synthesis. L-carnitine does not.

Arginine

Arginine is a conditionally essential amino acid marketed for nitric oxide production and vasodilation. The key emphasis is that little evidence, possible minimal nitric oxide/blood flow effects, and a “not recommended” practical stance.

HMB vs L-Carnitine

10. Muscle Buffering Capacity

Poor buffering capacity allows H+ to accumulate, pH to drop, and high-intensity performance to decline. Buffering can be improved through training and through nutritional strategies such as beta-alanine, sodium bicarbonate, and sodium citrate.

11. Creatine, Caffeine, and Stimulants

Creatine

Creatine supports ATP rephosphorylation through phosphocreatine (PCr), especially during short-duration, high-intensity efforts. About 98% is stored in muscle. Supplementation can increase creatine stores and is associated with improved strength, power, and lean mass. It is legal as a dietary supplement and not banned by the NCAA.

Typical loading: 20-25 g/day for 5 days, or 0.3 g/kg/day. Maintenance: 2 g/day or 0.03 g/kg/day. Saturation can also be reached with lower daily dosing over time. Notes emphasize no scientific support for dehydration, renal failure, or cramps as routine effects in healthy athletes.

Caffeine

Caffeine increases neural transmission, decreases perceived exertion, increases alertness and work capacity, and can improve both endurance and short-duration/high-intensity performance. Effective dose: 3-9 mg/kg about 60 minutes before activity. More than 9 mg/kg does not appear to provide additional benefit and raises side-effect risk.

Side effects include anxiety, GI disturbance, restlessness, insomnia, tremors, and arrhythmias. Lethal dose is typically described as greater than 5 g.

Pre-Workout Beverages and Stimulants

Pre-workout/energy drinks are identified as the most popular dietary supplement category among athletic and non-athletic populations in the notes. Common ingredients include caffeine, taurine, ginseng/guarana, carbohydrates, and B vitamins. Evidence is strongest for caffeine and carbohydrate contributions.

Ephedrine is listed as a stimulant and is most effective ergogenically when combined with caffeine, but ephedra-containing products were banned by the FDA and ephedrine is banned by many sport bodies. Citrus aurantium/bitter orange/synephrine may stimulate fat metabolism but may increase blood pressure and appears on banned-stimulant discussions.

12. Calculation and Dosing Cards

13. Missed-Question Trapboard

These are the Chapter 12 practice-question traps I want extra reps on.

14. Rapid-Fire Question Bank Cues

15. Final Exam Spellbook: Mechanism → Performance → Risk