Morin emg 2015_slideshare.pptx
Transcript of Morin emg 2015_slideshare.pptx
MUSCULAR POWER AND PERFORMANCE IN MASTERS ATHLETES
APPLICATION TO SPRINT RUNNING
@jb_morin
Pr. J-B Morin Université de Nice Sophia Antipolis Laboratoire Motricité Humaine, Education, Sport, Santé
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unice.frstaps.
PERFORMANCE EN SPRINT CHEZ LES ATHLÈTES MASTER – JB MORIN
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MUSCULAR POWER, EXPLOSIVENESS AND SPRINT
PERFORMANCE EN SPRINT CHEZ LES ATHLÈTES MASTER – JB MORIN
Membre deMUSCULAR POWER, EXPLOSIVE STRENGTH AND SPRINT
Power =
Force x elocity =
Work / Time
Pmax after ≈2s
15 to 30 W/kg
Explosiveness =
Rate of force production
Start….
Each step…
PERFORMANCE EN SPRINT CHEZ LES ATHLÈTES MASTER – JB MORIN
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SPRINT PERFORMANCE AND AGING
-‐0.73% /yr
-‐0.89% /yr
-‐1.02% /yr
-‐0.82% /yr
Rittweger, Proc Roy Soc B, 2009
PERFORMANCE EN SPRINT CHEZ LES ATHLÈTES MASTER – JB MORIN
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SPRINT PERFORMANCE AND AGING
Gatlin (USA) 22yrs: 9.85 s 33yrs: 9.74 s
Powell (USA) 22yrs: 9.87 s 33yrs: 9.81 s
Collins (St-‐K-‐N) PB at 38yrs: 9.96 s 2003 (27yrs: 9.99 s) 2015 (39yrs: 9.98 s)
PERFORMANCE EN SPRINT CHEZ LES ATHLÈTES MASTER – JB MORIN
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KNOWLEDGE…
TRAINING / PERFORMANCE HEALTH / WELL-‐BEING
Hidekichi Miyazaki WR 105yrs: 42.22 s
PERFORMANCE EN SPRINT CHEZ LES ATHLÈTES MASTER – JB MORIN
Membre deFORCE – VELOCITY – EXPLOSIVENESS….
Lindle, J Appl Physiol, 1997 Vanderwoort, Muscle Nerve, 2002
PERFORMANCE EN SPRINT CHEZ LES ATHLÈTES MASTER – JB MORIN
Membre deFORCE – VELOCITY – EXPLOSIVENESS….
Doherty, J Appl Physiol, 2003 Porter, Scand J Med Sci Sport, 1995
PERFORMANCE EN SPRINT CHEZ LES ATHLÈTES MASTER – JB MORIN
Membre deFORCE – VELOCITY – EXPLOSIVENESS….
Sipila, Eur J Appl Physiol, 1991
PERFORMANCE EN SPRINT CHEZ LES ATHLÈTES MASTER – JB MORIN
Membre deFORCE – VELOCITY – EXPLOSIVENESS….
Korhonen, J Appl Physiol, 2006
PERFORMANCE EN SPRINT CHEZ LES ATHLÈTES MASTER – JB MORIN
Membre deFORCE – VELOCITY – EXPLOSIVENESS….
More « specific » tests?
Edwen, Scand J Med Sci Sport, 2014
Membre deSPRINT MECHANICS IN MASTER ATHLETES….
Korhonen, Med Sci Sport Exerc, 2003 200 Hz
FREQUENCY = 1/(CONTACT TIME + FLIGHT TIME)
≈4 HZ
Membre deSPRINT MECHANICS IN MASTER ATHLETES….
Korhonen, Med Sci Sport Exerc, 2003 RUNNING SPEED = STEP LENGTH X STEP FREQUENCY
200 Hz
FREQUENCY = 1/(CONTACT TIME + FLIGHT TIME)
≈4 HZ
PERFORMANCE EN SPRINT CHEZ LES ATHLÈTES MASTER – JB MORIN
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Leg extension, jumps or temporal variables, no SPRINTING Force and Power outputs
PERFORMANCE EN SPRINT CHEZ LES ATHLÈTES MASTER – JB MORIN
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1 STUDY….
Korhonen, Med Sci Sport Exerc, 2006
Only 2 (im)possibilities L
SPRINT INSTRUMENTED TREADMILL St-Etienne, France Doha, Qatar Houston, TX
FORCE PLATES INSEP, Paris, France
POWER, FORCE, VELOCITY MEASUREMENTS DURING SPRINTING
PERFORMANCE EN SPRINT CHEZ LES ATHLÈTES MASTER – JB MORIN
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Rabita, Scand J Med Sci Sport 2015
2011 – 2015
Sprint Instrumented treadmill Track-‐Embedded Force Plates Elite Athletes
Horizontal GRF is paramount for acceleration Vertical GRF is paramount for top speed HZT Force at high speed higher in top athletes Hip extensors play a key role
Med Sci Sport Exerc 2011 Eur J Appl Physiol 2012 Scand J Med Sci Sport 2015 J Biomech 2015 Frontiers Physiol 2015
DETERMINANTS OF SPRINT RUNNING PERFORMANCE
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Only 2 (im)possibilities L
SPRINT INSTRUMENTED TREADMILL St-Etienne, France Doha, Qatar
FORCE PLATES INSEP, Paris, France
2015
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PERFORMANCE EN SPRINT CHEZ LES ATHLÈTES MASTER – JB MORIN
1927
Archibald V. HILL
1950’s
Franklin Henry
Modern Devices
v(t) = vmax.(1-e(-t/τ))
vmax
di Prampero et al., J Exp biol, 2005 Furusawa et al., 1927
Henry, 1954 Volkov & Lapin, 1979
Membre de
a(t) = (vmax/τ).e(-t/τ))
Fh(t) = m.a(t) + Fair Estimated from speed, mass and height
Ph(t) = Fh (t) . v(t)
v(t)
Ph(t) Fh(t)
Linear F-V relationship Polynomial 2 P-V relationship Validity ??
F0
V0
Pmax
PERFORMANCE EN SPRINT CHEZ LES ATHLÈTES MASTER – JB MORIN
A simple Xield method
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v(t) = vmax.(1-e(-t/τ))
Comparison with force plates
Validity, Reproductibility J
A simple Xield method
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PERFORMANCE EN SPRINT CHEZ LES ATHLÈTES MASTER – JB MORIN
Coming soon: simpler devices !
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P. Jimenez-Reyes, UCAM, Spain
iPhone6 app “MySprint”, 240 fps
E-J Marey, 1882
Fusil Chronophotographique, 24 fps
Pierre Samozino, PhD University of Savoy
FORCE-‐VELOCITY-‐POWER outputs of Usain Bolt’s World Record Running Speed (m/s)
Distance (m)
S(t) = Smax 1− e−t/τ( )
Field Measurements In competition conditions
Computing
Modeled Speed-‐time curve
Computed Net Horizontal Force output
Max Power Output of 30 W/kg reached after about 1 s…
Power = Force x Speed… Specihic, Field Sprint Force-‐Velocity-‐Power prohile
Jean-‐Benoit Morin, PhD University of Nice
“F0”
“V0”
Pmax
Vopt
F0 and V0 are the theoretical maximal outputs of the system Vopt is the speed at which Pmax is produced The magnitude of the slope (F0/V0) describes the Force-‐Velocity prohile of the athlete
PERFORMANCE EN SPRINT CHEZ LES ATHLÈTES MASTER – JB MORIN
Membre de PILOT STUDY….
OCTOBER 3-‐4, 2015 NICE
THANKS: Athletes, Organizers, Julien, Mehdi, Emilien, Guillaume
39 athletes 39 to 96 years old Sprint mechanics with aging? Force, Power, Velocity, Effectiveness Comparison to young elite data
Slawinski, Scand J Med Sci Sport, in press