Muscular Development Flashcards
(10 cards)
Myogenic Precursors
Myoblasts become Primary Myotubes @ 5 weeks ges. become Secondary Myotubes a few weeks later become myofibers @ 20 weeks gestation
Differentiation into fiber types occur when ….?
What type is 1st?
When is the earliest fetal movement?
1) Fibers are 1st innervated
2) Primary myotubes
3) 8 Weeks
Muscle Maturation-Contractile properties:
- Maximal Twitch Tension
- Relaxation Speed doubles between 3-10 y.o.
- Adult Muscle phenotype by 10 y.o.
Does muscle mass increase before strength?
When does peak maximum strength occur?
1) Yes
2) Maximum strength does not occur until after peak height and weight have occured
When is maximum strength achieved?
What happens with strength and speed of a contraction as we age?
Do we lose concentric or eccentric faster?
1) Peaks in 30s and declines by 50s
By age 70, 50% of strength is lossed
2) Decrease due to loss of balance
3) concentric
Research findings of exercise and older individuals:
- regular exercise combats functional declines associated with aging
- resistance training from moderate to high intensity is safe in increasing stength in women up to 96 y.o.
- gait speed improves with pre
- training with power can be more beneficaial than training for strength
function of cardiovascular system?
pulmonary system?
- Pumps blood, deliver to body
Provides nutrients
Removes waste products
Earliest system to function in embryo - Conducting and respiratory
Respiratory and ventilatory
delivers oxygen to blood
3 Things that close at birth
- ductus venosus
- formaen ovale
- ductus arteriosus
When does the pulmonary system and bronchial buds first appear?
Alveoli?
- 28 days gestation
- multiply in last weeks of gestation, continue to increase until about 8 y.o.
Cardiovascular and Pulmonary changes as we age
- Resting Heart Rate DECREASES
- Blood Pressure INCREASES
- Respiratory Rate DECREASES
