Lecture 10 : Nervous System Adaptations to Resistance Training Flashcards
(32 cards)
what is intermuscular coordination
coordination between muscular systems
training alpha motor neurons is very ….
task dependent
what does excitability of the corticospinal abstract mean
how easy it is to engage particular muscles through the corticospinal tract
what are CNS adaptations to resistance training
excitability
improved anticipation
muscle synergy
precision
what proprioceptive system is the strongest and what do we rely on the most
visual system : often regulate our task based on what we see in front of us
how does force modulation change from doing a task the first time compared to doing it many times
the first time we may not use the right amount of force or use the right muscles
the more times we do it we learn which muscles we need to contract and how
what is neural drive
refers to the collective output from the CNS to motor neurons, which directly controls how a muscle behaves
what does neural drive influence
- force production
- rate of force development (RFD)
- muscle coordination and timing
- fatigue resistance
when neural drive is altered (e.g by injury, fatigue or poor motor control) these patterns can become
- less efficient
- delayed or premature
- poorly sequenced
- overly co-contracted (leading to stiffness)
when neural drive is reduced patterns can become, less efficient, delayed or premature, poorly sequenced or overly co-contracted what does this lead to
- reduced force or power output
- poor coordination
- compensatory movement patterns
- increased injury risk
what is neural inhibition
reduction in voluntary neural drive of given muscle group
neural inhibition can either be via
centrally or peripherally
resistance training will increase excitability of the neural drive, is this task specific
not super task specific
resistance training will create adaptation in muscle control that is task specific in what ways
force, speed and vector (movement pattern)
what is a motor unit
one motor neuron and all the muscle fibres it innervates
each motor unit controls how many muscle fibres
multiple muscle fibres
each individual muscle fibre belongs to how many motor units
each individual muscle fibre belongs to only one motor unit
when the neuron fires what happens to the fibres its connected to
all its fibres contracts
what is Hanneman’s size principle
in order to contract a particular muscle, motor neurons with small cell bodies are recruited before motor neurons with large cell bodies
does low intensity training to failure work ? and why
(muscle cross sectional area and strength)
yes and no
Muscle CSA : low load to failure got similar change to high load to failure and not to failure
Strength : low load did get some strengths benefits (type Iia), but high load got a better benefit of strength (more type Iix fibres)
what is neuromechanical matching
neural system matches the recruitment of mechanically advantageous muscle fibres to a specific movement
rate coding refers to the
frequency at which a motor neuron sends action potentials to its muscle fibres
two points that effect rate coding
threshold of excitation
rate of stimulus (discharge rate)
which fibres have a lower threshold small oxidative fibres or glycolytic fibres
smaller oxidative fibres
