Download NZ Bowls - Burnside Bowling Club

Bowls Coaching
Technique Analysis
Technique analysis
SPORT BIOMECHANICS
Description of movement patterns
 Performance
 Efficiency
 Injury prevention
 Tools: Video Camera
Sports
Sports Biomechanics
Biomechanics ??
Concerned with the internal and
external forces on the body
Internal
External
The Coach & Biomechanist
A coach must be able to:
1. Identify movement features and
deviations
2. Describe positions, phases &
actions
3. Explain causes & mechanisms
4. Predict effects & techniques
5. Recommend physical or technical
corrections
6. Coach the athlete to make these
changes
Biomechanist
can assist with.
How do we measure?
 2D video analysis
What do we
measure?












Body positions
Segment sequencing
Distance
Speed
Range of motion
Acceleration
Force / Torques
Impacts
Strength
Rotational motion
Anthropometry
Muscle activity
Force – Motion relationship
Motion
=
Force
(mass)
x
Time
Force – Motion relationship
Motion
=
Force
x
Time
(mass)
Increased transfer of body weight
Increased trunk lean
Use of gravity
Larger step
Higher backswing
Delivery – timeline breakdown
1. Setup – hold and address
2. Trunk initiation
3. Backswing
…(initiate step)
4. Top backswing / start forward swing
…(Heel of leading leg planted)
5. Forward swing
6. Bowl release
7. Follow through
THEY ALL
INTER-RELATE
How do we analyse a delivery
1. Identify the problem areas, after you
have broken the delivery down into
key events and phases, and have
viewed video frame by frame.
2. Work BACKWARDS – the inefficiencies
will be caused by the preceding
phase(s).
Principles of movement SOME FOCUS AREAS
 Trunk action generating momentum
 Appropriate step width and length
 Line of the bowl arm
 Timing of lead leg plant with start of
forward swing
 Weight transfer / body position
changes setting up bowl release
DRIVE
DRIVE
DRIVE
Step Length
length
Step
Arm position at top of back swing
Arm position at
top of back swing
DRIVE
+ 28 deg
- 14 deg
Arm position at
top of back swing
DRIVE
+ 28 deg
- 44 deg
Arm position at
top of back swing
DRIVE
+ 28 deg
- 20 deg
Trunk position at bowl release
Feedback sheet…