Incorporating internal mechanical power into performance models in cycling
Journal Title: Journal of Science and Cycling - Year 2014, Vol 3, Issue 2
Abstract
Background: A number of models have been developed to establish the energy cost of cycling. These models have become better refined to account for the various energy demands, including air and rolling resistances. Among the established models, however, there does not appear to be sufficient consideration for changes to internal mechanical power (IP), the rate of energy to move the limbs against gravitational and inertial forces. Values up to 100 W have been reported for IP in cycling for cadences between 80 and 115 , and so the inclusion of IP in performance prediction models is arguably warranted. Quantifying IP has previously been done using either 1) a physiological approach (IPmet), in which the metabolic counterpart of the external mechanical power (power applied to the cranks) was subtracted from Ė (energy expenditure) to equal the metabolic equivalent of IPmet, which was then multiplied by delta efficiency (DE) to yield the IPmet; or 2) a biomechanical approach (IPmech), which used an inverse dynamics analysis of the kinematics and kinetics of cycling. Both approaches have notable advantages and limitations, which is why quantifying a range for IP, delimited by IPmet and IPmech, has been proposed by this research group.
Authors and Affiliations
H Giorgi| The University of Queensland, School of Human Movement Studies, Brisbane, Queensland, Australia.Queensland Academy of Sport, Brisbane, Queensland, Australia, M Andrews| Queensland Academy of Sport, Brisbane, Queensland, Australia, A Gray| University of New England, School of Science and Technology, Armidale, New South Wales, Australia, M Osborne| The University of Queensland, School of Human Movement Studies, Brisbane, Queensland, Australia.Queensland Academy of Sport, Brisbane, Queensland, Australia
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