Techniques, Modalities and Physiology - Hypertrophy Flashcards
Hypertrophy:
contractile elements enlarge and the extracellular matrix expands to support growth
Sacromere hypertrophy:
an increase in sacromeres and myofibrils in parallel or in series
Sarcoplasmic hypertrophy:
an increase in noncontractile elements and fluid
Myogenic stem cells or satellite cells respond to mechanical stress by…
fusing to existing myofibrils
Describe myogenic pathways:
- donate extra nuclei, increasing capacity to synthesize new contractile proteins
- more nuclei can increase the expression of myogenic regulatory factors (mTOR, MAPK - JNK, calcium dependent pathways)
Hormones serve as upstream regulators of ______ processes.
anabolic
Elevated anabolic hormone concentrations increase the likelihood of ____ _____, facilitating _____ ____ and subsides _____ ____.
- receptor interactions
- protein metabolism
- muscle growth
Name 3 hormones that regulate anabolic processes.
- insulin-like growth factor (IGF-1)
- testosterone
- growth hormone
Insulin-like growth factor provides the main ______ response for the ____ ____.
- anabolic
- whole body
Insulin-like growth factor leads to enhanced response to _____ ____.
mechanical loading
Insulin-like growth factor is produced in the _____ and _____ during exercise.
- liver
- muscles
Levels of IGF-1 can remain elevated in muscle ____ hours post exercise.
72
Post exercise elevated IGF-1 levels means:
- promotes hypertrophy by increasing the rate of protein synthesis
- activate satellite cells
Testosterone is produced where?
- testes (men only)
- adrenal glands and ovaries (female only)
Only the ___% of unbound free testosterone has an effect on ____ ____.
- 2%
- muscle hypertrophy