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Digest #4591
Message
Thu Jul 12, 2012 11:11 am (PDT) . Posted by:
"Giovanni Ciriani" gciriani
Ken,
This is very insightful!
Another way (more understandable to me) to interpret the net effect of
higher frequency, is that a leg developing lower peak power is able to
develop higher average power.
Giovanni Ciriani - West Hartford, CT - USA
On Tue, Jul 10, 2012 at 10:30 AM, <CoachJ1@aol.com > wrote:
> **
>
>
> Hi Nick!
>
> In a message dated 7/10/2012 8:56:51 A.M. Central Daylight Time,
> nick.tatalias@gmail.com writes:
>
> The science seems to say that the blades give him an advantage* in a
> race*,
> mainly no fatigue in returning energy at top speed running
>
> You are indeed accurate that a couple of the Rice researchers did find the
> blades conferring an advantage. However, the Anerobic Speed Reserve tests
> performed at Rice did not show Pistorius fatiguing any differently than
> able bodied sprinters.
>
> "Based on the data," says Weyand, "the blades do not confer an enhanced
> ability to hold speed over a 400m race."
>
> So, the controversy involves another research finding.
>
> Here is the public statement issued by Weyand/Bundle back in September of
> 2011:
>
>
> "The sprinting mechanics of Oscar Pistorius: Because the artificial lower
> limbs of Mr. Pistorius weigh only half as much as an intact lower-limb, he
> is not bounded by the swing time minimum that applies to athletes with
> biological limbs. Mr. Pistorius can reposition his lightweight, artificial
> limbs in 0.28 seconds, and therefore 20% more rapidly than most
> intact-limb
> athletes. To appreciate just how artificial Mr. Pistorius' swing time is,
> consider that the average limb repositioning time of six former 100-meter
> world
> record holders (Ben Johnson, Carl Lewis, Donovan Bailey, Maurice Greene,
> Tim Montgomery, and Justin Gatlin) is 0.34 seconds. Mr. Pistorius' limb
> repositioning times are 15.7% more brief than six of the fastest male
> sprinters
> in recorded human history.
> Reduced limb repositioning times allow Mr. Pistorius to spend less time in
> the air between steps. Shorter aerial periods, in turn, substantially
> reduce how hard Mr. Pistorius must hit the ground during each stance
> period to
> lift and move his body forward into the next step. Hence, the net effect
> of
> lightweight prosthetic limbs that artificially reduce the swing and aerial
> phases of the stride is to substantially reduce how hard Mr. Pistorius
> must hit the ground to run at the same speeds as his intact-limb
> competitors.
> In this sense, the level of sprinting athleticism required for Mr.
> Pistorius to achieve world class speeds is dramatically reduced compared
> to his
> intact limb competitors. Mr. Pistorius attains world-class sprinting
> speeds
> with the ground forces and foot-ground contact times of a slow and
> relatively uncompetitive runner. Mr. Pistorius' intact-limb competitors,
> with
> natural limb weights and swing times, lack this option, and therefore must
> achieve their speeds via exclusively biological means. Mr. Pistorius, in
> contrast, achieves these speeds through the use of technology.
> Indeed, the gait anomalies of Mr. Pistorius are so large that they can be
> observed with a moderately experienced eye. Mr. Pistorius, like slow
> intact-limb runners, spends the majority of his race time on the ground
> while his
> competitors, in contrast, spend the majority of their race time in the
> air."
> Ken Jakalski
> Lisle High School
> Lisle, IL USA
>
> [Non-text portions of this message have been removed]
>
>
>
[Non-text portions of this message have been removed]
This is very insightful!
Another way (more understandable to me) to interpret the net effect of
higher frequency, is that a leg developing lower peak power is able to
develop higher average power.
Giovanni Ciriani - West Hartford, CT - USA
On Tue, Jul 10, 2012 at 10:30 AM, <CoachJ1@aol.
> **
>
>
> Hi Nick!
>
> In a message dated 7/10/2012 8:56:51 A.M. Central Daylight Time,
> nick.tatalias@
>
> The science seems to say that the blades give him an advantage* in a
> race*,
> mainly no fatigue in returning energy at top speed running
>
> You are indeed accurate that a couple of the Rice researchers did find the
> blades conferring an advantage. However, the Anerobic Speed Reserve tests
> performed at Rice did not show Pistorius fatiguing any differently than
> able bodied sprinters.
>
> "Based on the data," says Weyand, "the blades do not confer an enhanced
> ability to hold speed over a 400m race."
>
> So, the controversy involves another research finding.
>
> Here is the public statement issued by Weyand/Bundle back in September of
> 2011:
>
>
> "The sprinting mechanics of Oscar Pistorius: Because the artificial lower
> limbs of Mr. Pistorius weigh only half as much as an intact lower-limb, he
> is not bounded by the swing time minimum that applies to athletes with
> biological limbs. Mr. Pistorius can reposition his lightweight, artificial
> limbs in 0.28 seconds, and therefore 20% more rapidly than most
> intact-limb
> athletes. To appreciate just how artificial Mr. Pistorius' swing time is,
> consider that the average limb repositioning time of six former 100-meter
> world
> record holders (Ben Johnson, Carl Lewis, Donovan Bailey, Maurice Greene,
> Tim Montgomery, and Justin Gatlin) is 0.34 seconds. Mr. Pistorius' limb
> repositioning times are 15.7% more brief than six of the fastest male
> sprinters
> in recorded human history.
> Reduced limb repositioning times allow Mr. Pistorius to spend less time in
> the air between steps. Shorter aerial periods, in turn, substantially
> reduce how hard Mr. Pistorius must hit the ground during each stance
> period to
> lift and move his body forward into the next step. Hence, the net effect
> of
> lightweight prosthetic limbs that artificially reduce the swing and aerial
> phases of the stride is to substantially reduce how hard Mr. Pistorius
> must hit the ground to run at the same speeds as his intact-limb
> competitors.
> In this sense, the level of sprinting athleticism required for Mr.
> Pistorius to achieve world class speeds is dramatically reduced compared
> to his
> intact limb competitors. Mr. Pistorius attains world-class sprinting
> speeds
> with the ground forces and foot-ground contact times of a slow and
> relatively uncompetitive runner. Mr. Pistorius' intact-limb competitors,
> with
> natural limb weights and swing times, lack this option, and therefore must
> achieve their speeds via exclusively biological means. Mr. Pistorius, in
> contrast, achieves these speeds through the use of technology.
> Indeed, the gait anomalies of Mr. Pistorius are so large that they can be
> observed with a moderately experienced eye. Mr. Pistorius, like slow
> intact-limb runners, spends the majority of his race time on the ground
> while his
> competitors, in contrast, spend the majority of their race time in the
> air."
> Ken Jakalski
> Lisle High School
> Lisle, IL USA
>
> [Non-text portions of this message have been removed]
>
>
>
[Non-text portions of this message have been removed]
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