post midterms Flashcards
(30 cards)
VO2 Max
the maximum amount of o2 that can be delivered to and consumed by the body tissues per unit
Absolute VO2
total volume of oxygen taken up by the body (more useful body weight is not carried - rowing cycling
relative vo2
volume of oxygen taken up by the body relative to body weight (more useful for activities)
o2 delivery determing factors
hemoglobin (o2 in blood) the oxygen binding protein in red blood cells
cardiac output - maximum volume of blood that the heart can pump each minute
o2 use
mitochondria
muscle mass
capillaries
muscle biochemistry
3 factors that affect performance besisdes vo2
- Mental attitude
- running economy (efficiancy)
- high lactate threshold
Alactic acid ATP/PC system
creatine phosphateis the fuel source - burns very fast 8-12 seconds
Lactic acid system
Glycogen is the only energy store burns fast to medium 30 seconds to 3 minutes
aerobic energy
glycogen and fats is the source - 3+ minutes takes a while to recover 24 + hours
what are the thick filaments called
myosin
what are the small filaments called
actin
the name of a functional unit of muscle contraction
sarcomere - has alternating thick and thin filaments
The name of the part of the muscle fiber containing the muscle filaments (microfilaments)
myofibrils
Which filament is sliding and which is pulling
Myosin (thick) pulls actin (small) in
+ ion necessary for muscle contraction
calcium ions ca+2
the role of atp in muscle contraction
ATP is responsible for cocking (pulling back) the myosin head, ready for another cycle. When it binds to the myosin head, it causes the cross bridge between actin and myosin to detach. ATP then provides the energy to pull the myosin back
explain periodization
systemic planning or physical training that involves progressive cycling of a program during various training phases
explain volume in strength training
measure or estimate of the total work performed
motor unit
concept of a motor unit was introduced by Sherrington the #fibres/motors unit varies
fine movements
eye muscle= 1 finer/motor unit
gross movements
postural control = up to 700/motor unit
size principle
recruits smallest motor units first then systematically increases size of unit recruited until desired force achieved
two factors affecting strength
neural control
muscle cross-sectional area
macro cycle
entire training year
