Lecture 3 : Asymmetry Flashcards
(24 cards)
what is a bilateral deficit
when the summed unilateral force is greater than the bilateral force
is bilateral deficit mostly seen in trained or untrained individuals
untrained
how to work out someones bilateral deficit
(100 x bilateral / left unilateral + right unilateral ) - 100
what is the sticking point
the position where the strength of muscles can not overcome the resistance
why do we tend to have two acceleration phases in a strength movement
due the the sticking point, movement tends to slow at this point
how is the sticking point affected by asymmetries
mechanical advantage and inter-muscular coordination, it can also be affected by our dominance
what does wire together fire together mean
our brain wires the muscle, motor pattern in the brain, muscles will fire together if they are wired together in that motor pattern
is asymmetry correlated with injury ?
there is low quality of evidence to support this so the answer is not yet
is asymmetry associated with reduced performance
depends on the task
what is the effect of asymmetries on strength or speed in bilateral activities
no effect
what is the effect of asymmetries for activities with the dominant limb
positive effect
what is the effect of asymmetries for activities such as change of direction or kicking on the non dominant side
negative effect
do sports cause skeletal asymmetry (e.g tennis)
those who started before puberty show stronger asymmetry and fewer injuries in racquet arm
difference between muscle and bone asymmetries using tennis example
all tennis players had greater muscle mass on racquet arm, but the differences seen in bone length happened to those who started playing before puberty
what are sports where a little asymmetry is helpful and why
asymmetrical sports that require high speed or ballistic movements should be a little asymmetrical, also to protect spine
the functional movement screen is a screening procedure to look for
look at the symmetry of the athlete
why are there misconceptions that asymmetry leads to injury
without complex biochemical testing therapists will often compare the function of the injured limb to the non injured which is why people think that asymmetry is linked to injury
a study found bilateral training (e.g squats) to be better for
bilateral strength power
a study found unilateral training (e.g split squats) to be better for
unilateral jumping and COD
both unilateral and bilateral training improve ..
performance
in terms of performance is bilateral or unilateral good for improving performance
both are necessary, a well rounded athlete would train both
what % asymmetry is likely natural and does not impair performance
10% is likely natural and does not seem to impair their performance
unilateral training will reduce muscle ….
reduce muscle asymmetry and increase cross sectional area, may improve unilateral performance outcomes
bilateral strength training has a greater effect on
performance and strength / power measures
