def: is a systematic program of exercise for the development of the muscular system
resistance training
outcomes for resistance training (4)
improved or maintained:
Muscular endurance
Muscular strength
Muscular hypertrophy
Muscular power
advantages of building bone mass (3)
Increase in bone density & bone strength.
Counteracts loss of bone mineral.
Decreases the risk of falls with age.
health benefits of resistance training (5)
Increase in size & strength of ligaments & tendons.
Lowers BP in hypertensive individuals.
Increase in fat-free mass.
Decreases fat mass & relative body fat.
May prevent the development of low back syndrome
a single muscle cell can be classified according to (5)
Colour Speed of contraction Strength Fatigue resistance Energy source.
muscle fiber is composed of ______
myofibrils (protein structures)
colours of muscle fiber types
Slow-Twitch Fibres (Type I): red
Intermediate Fibres (Type IIA): red/white
Fast-Twitch Fibres (Type IIX): white
contraction speed of muscle fiber types
Slow-Twitch Fibres (Type I): slow
Intermediate Fibres (Type IIA): moderately fast
Fast-Twitch Fibres (Type IIX): very fast
strength of muscle fiber types
Slow-Twitch Fibres (Type I): low
Intermediate Fibres (Type IIA): medium
Fast-Twitch Fibres (Type IIX): high
fatigue resistance of muscle fiber types
Slow-Twitch Fibres (Type I): high
Intermediate Fibres (Type IIA): fairly high
Fast-Twitch Fibres (Type IIX): low
principal energy source of muscle fiber types
Slow-Twitch Fibres (Type I): aerobic
Intermediate Fibres (Type IIA): aerobic/ anaerobic
Fast-Twitch Fibres (Type IIX): anaerobic
muscles contain
a mix of slow-twitch & fast-twitch fiber (the type of fiber that acts is dependent on the type of work required)
used in endurance activities
slow-twitch muscle fibers
used in strength & power activities
fast-twitch muscle fibers
skeletal muscle components smaller to larger
myofibril, muscle fiber (cell), fascicle (bundle), muscle
resistance training increases muscle strength by:
hypertrophy of the muscle fibers
muscle learning
resistance training adaptations first 2 to 8 weeks
Rapid increase in strength due to neural adaptations.
No difference in rate of progression between males & females
resistance training adaptations 8 to 10 weeks
Muscle hypertrophy contributes more than neural adaptation to strength gains, but hypertrophy eventually levels off.
Greater hypertrophy [cross-sectional area (CSA)] in males due to testosterone.
resistance training adaptations greater than 6 months
Continues to increase strength without hypertrophy.
Believed that a secondary phase of neural adaptation is most likely responsible for strength gains occurring between 6 & 12 mo of training.
Hypertrophy may be limited to no more than 12 mo.
Is a descriptive term which is defined as an increase in the size of a cell or tissue (making larger muscle fibers)
hypertrophy
resistance training results in the hypertrophy of skeletal muscle by increasing:
Muscle fiber size:
increase in myofibril size,
increase in myofibril number
Amount of connective tissue around :
the muscle,
each bundle of muscle fibers,
each muscle fiber
Cell content of enzymes & energy storage:
particularly ATP & glycogen.
TF: preferred increases the size of slow-twitch fiber, which are the most responsive to a strength stimulus
F: size of fast-twitch fiber
TF: resistance training increases the number of muscle fibers
F: it doesn’t increase the number of muscle fibers
improves the body’s ability to activate & recruit motor units even before muscle size increases
muscle learning increases strength