- Biomechanics @University of Rome "Tor Vergata", Faculty of Medicine and Surgery, School of Sports and Exercise Sciences - Research&Development @Newsens S.r.l. , Rome - Italy European Weightlifting Federation Coaches Forum Olympic Preparation Centre - Rome, 18th January 2014 Muscle strength assessment during resistance training exercises: sensing weights kinematics using inertial sensors Pietro Picerno, PhD ([email protected])
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- Biomechanics @University of Rome "Tor Vergata", Faculty of Medicine and Surgery, School of Sports and Exercise Sciences
EWF Coaches Forum Pietro Picerno Muscle strength assessment in resistance training exercises
Too many wires around…
EWF Coaches Forum Pietro Picerno Muscle strength assessment in resistance training exercises
Evolut ion of technology
EWF Coaches Forum Pietro Picerno Muscle strength assessment in resistance training exercises
Alternat ives: measur ing barbel l k inemat ics
BARBELL ACCELERATION(inertial sensors)
Rugby Rovigo - Italy
EWF Coaches Forum Pietro Picerno Muscle strength assessment in resistance training exercises
Tri-axial gyroscopeTri-axial accelerometer
• small
• low power consumption
Integrated system
Bluetooth®
Evolut ion of technology
EWF Coaches Forum Pietro Picerno Muscle strength assessment in resistance training exercises
Iner t ia l sensors: pr inc ip le of funct ioning
EWF Coaches Forum Pietro Picerno Muscle strength assessment in resistance training exercises
Inner ear
EWF Coaches Forum Pietro Picerno Muscle strength assessment in resistance training exercises
Iner t ia l sensors
• triaxial accelerometer
(measure of linear accelerations along the geometrical axes of the device)
• triaxial gyroscope
(measure of angular velocities about the xes of the device)
z
y
x
EWF Coaches Forum Pietro Picerno Muscle strength assessment in resistance training exercises
Why gyroscopes?
accelerometer’s axis alignedwith weight’s direction
za
g
az- g
za
g
a
za
gaz- gcosa
accelerometer’s axis continuously rotates
EWF Coaches Forum Pietro Picerno Muscle strength assessment in resistance training exercises
From accelerat ion back to ve loc i ty
acceleration
velocity
v = v0 + a(t-t0)
Concentric phase [s]
EWF Coaches Forum Pietro Picerno Muscle strength assessment in resistance training exercises
Barbel l ’s accelera t ion and ve loc i ty
-600
-400
-200
0
200
400
600
800
0 0.25 0.5 0.75 1 1.25
Tempo [s]
Velocity [cm/s]Force [N] Power [W]
b e n c h p re s s @ 2 0 k g ( e c c - c o n c )L av o ro c o n s o v ra c c a r i c h i ( i s o i n e r z i a l e )
Time [s]
EWF Coaches Forum Pietro Picerno Muscle strength assessment in resistance training exercises
Barbel l ’s accelera t ion and ve loc i ty
-1000
-500
0
500
1000
1500
0 0.25 0.5 0.75 1 1.25
Po
ten
za [
W]
Tempo [s]
@ 40 kg@20 kg @ 60 kg
b e n c h p re s s ( e c c - c o n c )
Time [s]
Po
we
r [W
]
EWF Coaches Forum Pietro Picerno Muscle strength assessment in resistance training exercises
W h i c h v a l u e s h o u l d w e u s e t o r e p r e s e n t t h e e x p r e s s i o n o fm u s c l e p o w e r d u r i n g e a c h s i n g l e r e p e t i t i o n ?