Webinar on qa
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Transcript of Webinar on qa
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Quadrant analysis:Quadrant analysis:theorytheory
Andrew R. Coggan, Ph.D.
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What is quadrant analysis?What is quadrant analysis?
Quadrant analysis is a graphical tool for analyzing powermeter data to provide insight into the neuromuscular demands of a particular race or training session. A better understanding of such demands can be helpful not only for optimizing training but also behaviors during races themselves.
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Quantifying the neuromuscular Quantifying the neuromuscular demands of training and racing: demands of training and racing:
AEPF and CPVAEPF and CPV
Average effective pedal force (AEPF) =(power • 60)/(cadence • 2 • Pi • crank length)
Circumferential pedal velocity (CPV) =(cadence • 2 • Pi • crank length)/60
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Frequency distribution histogram of Frequency distribution histogram of AEPF during a level 3 training rideAEPF during a level 3 training ride
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AEPF-CPV relationshipAEPF-CPV relationshipduring a level 3 training rideduring a level 3 training ride
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AEPF-CPV-time relationshipAEPF-CPV-time relationshipduring a level 3 training rideduring a level 3 training ride
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Statement of the problemStatement of the problem
Simply plotting AEPF and CPV, even against each other and/or time, primarily tells you what you actually did during a particular race or training session, and provides only limited insight into the impact that had/is likely to have upon you from a physiological perspective.
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Muscle force-velocity andMuscle force-velocity andpower-velocity relationshipspower-velocity relationships
Maximal force (Fo)
Maximal velocity(Vmax)
Maximal power (Pmax)
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AEPF-CPV andAEPF-CPV andpower-CPV relationshippower-CPV relationship
Maximal AEPF (= Fo)
Maximal CPV(= Vmax)
Maximal power (Pmax)
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Maximal AEPF-CPV and Maximal AEPF-CPV and submaximalsubmaximal power power
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Fiber type recruitment as a function of Fiber type recruitment as a function of exercise intensityexercise intensity
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Vollestad et al. Acta Physiol Scand 125:395-405, 1985
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EMG activity as a function of cadenceEMG activity as a function of cadence
MacIntosh, Neptune, and Horton, Med Sci Sports Exerc 2000; 32:1281-1287
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Fiber type recruitment as a Fiber type recruitment as a function of cadencefunction of cadence
Ahlquist et al., Eur J Appl Physiol 1992; 65: 360-364.
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Maximal AEPF-CPV and powerMaximal AEPF-CPV and power
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AEPF vs. CPV during flat time trialAEPF vs. CPV during flat time trial
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AEPF vs. CPV during flat time trialAEPF vs. CPV during flat time trial
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QA of flat time trialQA of flat time trial
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QA of 6 x 1 km from standing startQA of 6 x 1 km from standing start
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QA with data from different PMsQA with data from different PMsRide #1
Ride #2