Week 9- effects of resistance training Flashcards
What is muscular strength?
maximal force that a muscle group can generate
-1 repetition maximum
What is muscular endurance?
ability to make repeated contractions against a submaximal load
What is high-resistance training?
-6-10 reps till failure
-results in strength increase
What is low-resistance training?
-30-40 reps till failure
-results in increased endurance
What is sarcopenia?
loss in muscle mass
What occurs to the muscles as we age?
-loss of muscle mass
-atrophy type 2 fibres
-loss of motor neurons
-reduced number of both type 1 and 2 fibres
What does resistance training promote?
Muscle hypertrophy
What is responsible for early gains in strength?
Neural adaptations
What are the strength gains during the first 8 weeks of training due to?
CNS adaptations
What shows the CNS adaptations in the early stages of training?
-strength increases of training whilst no change in fibre size
-training in one limb results in strength in untrained limb
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What are the adaptations that occur in the muscle fibres that occurs later on in the training?
-increase muscle fibre specific tension
-increase muscle mass
What are the neural adaptations from resistance training?
-increased neural drive
-increase in number of motor units recruited
-increase in firing rate of motor units
-increase motor unit synchronisation
-improved neural transmission across neuromuscular junction
-Changes in rate of agonist and antagonist co-activation
What is the mechanism seemed to be linked with training-induced increase in specific tension in type 1 fibres?
increase in calcium sensitivity
what does an increase in calcium sensitivity cause?
greater number of cross-bridge bound to actin
What is the result of a greater number of cross-bridge binding to actin?
-more force per motor unit
-strength gains independent of muscle growth
What is hyperplasia?
increase in number of muscle fibres
What causes muscle hypertrophy?
increased muscle proteins (actin and myosin)