Cap. 2
Biomecânica do
Movimento Humano
prof. L.A.Bertolo
http://labertolo.tripod.com.br
Cinesiologia
Kines: Latin ==> “movimento”
 logos: “estudo de”
 Estudo do Movimento.

Cinesiologiay==>Anatomia & Fisiologia,
Psycologia, Desenvolvimento Motor,
Pedagogia, Biomecânica
science concerned with
effects of forces acting
on a system (body)
Rigid Body
Mechanics
Statics
-at rest
-constant velocity
Dynamics
-changing motion (acceleration)
Kinematics
-description of motion
Kinetics
-study of the forces that cause
or tend to cause the
changes in motion
Why study Biomechanics?

To understand how people can move.
– To enhance skill performance by improving
technique.
» elite athletes
• USOC, professional sports
» physical challenges
• ACL deficit, CP gait, wheelchair, age-related disease
– To lower the risk for injury
» Exercise equiment & technique, shoes & surfaces,
braces & orthotics, automobiles, collisions
Why do we need biomechanics?

We don’t teach much, we
provide an environment
where learning can take
place.
– Coach: strategy
– Teaching
» skills: “farm system”
» fitness: CV & strength


Cater to the converted.
Serve the skilled.

We treat symptoms of an
injury, with less emphasis
on etiolgy (cause) of an
injury
– placebo effect vs true
treatment effects
– high rate of reoccurrence
Safety & Performance Trade-Off
Ball comparison, NBA vs WNBA
Ave Average Hand/Ht Hand
Ball
hand/ball
Ht Ht (inches) Ratio Length Size (inches)
ratio
Male 6'7''
79
0.108
8.53
29.625
0.288
Female 6'
72
0.108
7.78
28.625
0.272
Average NBAers hand is 28.8% of ball length
Average WNBAers hand is 27.2% of ball length
How big should the WNBA ball be to equate males & females?
Need for biomechanics in
children’s sports
Biomechanics
and Safety
Click here to go to a web
An on-line
site that
covers
most of the
concepts.
site that is a bit more advanced,
but more interactive.
Try it, you’ll like it!!