gen-define-muscle-hypertrophy-and-give-one-short-worked-example-aac5

Define muscle hypertrophy and give one short worked example.

# Muscle Hypertrophy **Definition:** Muscle hypertrophy is the increase in muscle size through the growth of muscle fiber cells, primarily achieved through resistance training that creates mechanical tension and metabolic stress, triggering protein synthesis to exceed protein breakdown. ## Worked Example **Scenario:** A person performs bicep curls for 12 weeks - **Initial state:** Bicep muscle fiber diameter = 60 μm - **Training stimulus:** 3x per week, progressive overload - **Adaptation process:** 1. Resistance training causes micro-tears in muscle fibers 2. Body responds by activating satellite cells 3. Satellite cells fuse to existing fibers and donate nuclei 4. Increased protein synthesis occurs (muscle protein synthesis > breakdown) 5. New myofibrils are added to muscle fibers - **Result after 12 weeks:** Bicep muscle fiber diameter increases to 70 μm - **Percentage increase:** (70-60)/60 × 100 = **16.7% hypertrophy** This increase in cross-sectional area translates to visibly larger muscles and increased strength capacity.