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Physiology · Fiber Types · Hypertrophy · Program Design
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ACE Exam-Style Case Studies
Apply Chapter 9 knowledge to real clients. Write your answer first, then reveal the model response.
Muscle Fiber Types
| Fiber | Also Called | Mitochondria | Fatigue | Force | Used For |
|---|---|---|---|---|---|
| Type I | Slow-oxidative | High | Resistant | Low | Endurance, posture |
| Type IIa | Intermediate / FOG | Moderate | Moderate | Moderate-high | Strength & power, up to 3 min |
| Type IIx | Fast-glycolytic | Few | Very fast (seconds) | Highest | Maximal power, sprints |
Hypertrophy Types
MyofibrillarGrowth of contractile proteins (actin/myosin). Increases SIZE + FORCE. Strength training target.
SarcoplasmicIncrease in fluid + non-contractile elements. Increases SIZE only — no force gain. Bodybuilding volume training.
Transient ("Pump")Fluid accumulation between cells post-training. Quickly diminishes. Form of sarcoplasmic hypertrophy.
Training Principles
OverloadStress must exceed current capacity to drive adaptation. Progressive overload = foundation of all strength gains.
Specificity (SAID)Adaptations are specific to demands. Fiber type, speed, angle, movement pattern — all specific.
ReversibilityGains lost when training stops. Neural patterns more durable than hypertrophy. Rarely returns to pre-training baseline.
Diminishing ReturnsAdvanced trainees need progressively more effort for smaller gains. Change exercise to break plateau.
Rest Intervals by Goal
| Goal | Rest | Rep Range | Intensity |
|---|---|---|---|
| Endurance | ≤30–60 sec | 15–25+ | Low |
| Hypertrophy | 60–90 sec | 6–15 | Moderate |
| Strength | 2–5 min | 1–6 | High |
| Power | 2–5 min | 1–5 | Very high |
Sarcomere Anatomy
Z-linesBoundaries of each sarcomere. Pulled closer together during contraction.
H ZoneCenter of sarcomere. Contains ONLY myosin — no actin extends here. Lighter in color.
M LineThin line crossing center of H zone.
I BandContains actin only — no myosin overlap. Lightens as muscle contracts.
Double-Progression Protocol
Step 1 — Add RepsWork within a rep range (e.g., 8–12). Add one rep per session until top of range achieved with good form.
Step 2 — Add WeightOnce top of range achieved → increase resistance by ~5%. Reset to bottom of rep range.
No Time LimitWhether it takes 1 week or 1 month — weight increases only when earned with proper form.