Stability & Balance.

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Presentation transcript:

Stability & Balance

Centre of Gravity The point in the body about which all parts of the body are in balance or the point at which gravity is centred (not necessarily inside the body) COG is not confined to one location, as the body moves so the COG moves with it in the direction the movement occurs

RUNNING EXAMPLE This runner has an upright trunk Level pelvis Centre of Gravity RUNNING EXAMPLE This runner has an upright trunk Level pelvis Centre of gravity is well behind the contact point of the leading foot This allow progressive loading of the leading leg With a trunk leaning forwards The centre of gravity is almost directly over the foot as it lands The loading on the foot, ankle, knee, pelvis rises steeply

Line of Gravity This is a line that goes from the Centre of Gravity straight down to the ground.

Base of Support The base of support refers to the area between the points of contact an object has with the ground.

Increasing Stability Stability is increased when Centre of Gravity is lowered

Increasing Stability Stability is increased when the line of gravity falls within the BOS (Base of Support)

Increasing Stability Stability is increased when the size of the Base of Support is increased either by spreading points of contact or adding another one.

Increasing Stability Stability is increased with increased mass Greater inertia – requires more force by an opponent to move the line of gravity Eg. Rugby – a bigger forward pack has an advantage in scrums

Increasing Stability Stability also is increased when BOS is extended in the direction of an oncoming force Stability is increased when the line of gravity is moved towards an oncoming force

Increasing Stability Stability also is increased when a body part compensates for the movement of another body part. For example: A karate kick requires your trunk to move back as you kick to maintain balance.