edu4sbm sports biomechanics 1 lecture week 7 balance and stability, core stability, cog

EDU4SBM Sports Biomechanics

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Lecture Week 7Lecture Week 7

Balance and Stability, Core Balance and Stability, Core Stability, COG Stability, COG


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Balance and Stability

“How balanced are you?”

Skilled athletes are able to employ certain tactics to increase their stability under oncoming forces, practically bracing themselves to be immovable.

Chris Judd and Jimmy Bartel

Young athletes learning a skill:


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Some sports depend almost exclusively on

As soon as the athlete loses balance, he or she loses the contest. The following sports fall into that category:

Cycling Speed skating

Judo Figure skating

Diving Weightlifting

Skiing Gymnastics

Fencing Wrestling


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Other sports require athletes to

These sports have similar movement patterns and include the following:

Baseball and softball Ice hockey

Football Tennis

Basketball Field hockey

Soccer Volleyball


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Types of stability

1. Linear Stability

is the resistance of an athlete or object against being moved in a certain direction

Sport dependentFootball

Baseball Catcher

2. Rotary Stability

is the resistance of an athlete or object against being tilted, tipped over, up ended or spun around in a circle.


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Centre of Gravity


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Factors which affect balance and stability

The size of the base of support

The position of the line of the COG relative to the base of support

The height of the COG

The mass of the body


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The Size of the Base of support

A person is more stable when standing on two feet than does a person standing on one


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The closer the line of the COG is to being directly over the base of support ->

The closer the line of the COG is to being at the edge of the base of support ->

This is required by many sports: ie: diving, sprint start


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The height of the COG


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The mass of the body


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Centre of Gravity, Stability & Balance

Stability and balance will be easier if:

• The mass is large

• The base is large

• The centre of gravity is low

• The centre of gravity is located over the base

Headstand Handstand


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The nature of the crouch position reflects three important principles of stability:

1) A broader base of support increases stability. (A catcher’s stance places feet more than hip-width apart.)

2) Centralizing the line of gravity inside the support base increases stability. (A

straight back and head held upright centralize the line of gravity.)

3) A lower center of gravity increases stability. (Crouching’s deep knee bend lowers the center of gravity.)


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Many times, stability depends on an athlete’s ability to put the line of gravity towards an oncoming force.

The movement temporarily unbalances the athlete, but then the impact of the force re-balances him or her.


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CORE STABILITY http://www.brianmac.co.uk/corestab.htm

Most throwing and striking sports require an efficient transfer of force from the ground up to achieve maximum acceleration of the upper limb or implement.

• This transfer of force is often a function of how well the upper body and lower body are connected.

• By strengthening the trunk, the athlete creates a solid unit capable of developing and transferring forces from the legs through the trunk to the arms and possibly the implement.

• The sum of these integrated forces results in optimal acceleration of the ball or implement. Major sports in which this transfer of forces is critical for good performance include the following:

• Baseball, Softball, Discus, Shot Put, Football, Tennis, Golf, Basketball, Javelin

edu4sbm sports biomechanics 1 lecture week 7 balance and stability, core stability, cog

Documents

cogedu4sbm sports biomechanics

striking sports

following sports fall

line of gravity

largethe base

stability balancestability

cog relative

largethe centre of gravity