A physiological counterpoint to mechanistic estimates of "internal power" during cycling at different pedal rates

Ernst Albin Hansen, Lars Vincents Jørgensen, Gisela Sjøgaard

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Udgivelsesdato: Apr
OriginalsprogEngelsk
TidsskriftEuropean Journal of Applied Physiology
Vol/bind91
Udgave nummer4
Sider (fra-til)435-442
ISSN1439-6319
DOI
StatusUdgivet - 2004

Fingeraftryk

Leg
Muscles

Citer dette

@article{57f8cac0f4a711db821c000ea68e967b,
title = "A physiological counterpoint to mechanistic estimates of {"}internal power{"} during cycling at different pedal rates",
abstract = "Reported values of {"}internal power{"} (IP) during cycling, generated by the muscles to overcome energy changes of moving body segments, are considerably different for various biomechanical models, reflecting the different criteria for estimation of IP. The present aim was to calculate IP from metabolic variables and to perform a physiological evaluation of five different kinematic models for calculating IP in cycling. Results showed that IP was statistically different between the kinematic models applied. IP based on metabolic variables (IP(met)) was 15, 41, and 91 W at 61, 88, and 115 rpm, respectively, being remarkably close to the kinematic estimate of one model (IP(Willems-COM): 14, 43, and 95 W) and reasonably close to another kinematic estimate (IP(Winter): 8, 29, and 81 W). For all kinematic models there was no significant effect of performing 3-D versus 2-D analyses. IP increased significantly with pedal rate - leg movements accounting for the largest fraction. Further, external power (EP) affected IP significantly such that IP was larger at moderate than at low EP at the majority of the pedal rates applied but on average this difference was only 8{\%}.",
keywords = "Adult, Bicycling, Biomechanics, Computer Simulation, Diagnosis, Computer-Assisted, Energy Transfer, Exercise Test, Humans, Male, Models, Biological, Muscle Contraction, Muscle, Skeletal, Oxygen Consumption, Physical Exertion, Reproducibility of Results, Sensitivity and Specificity",
author = "Hansen, {Ernst Albin} and J{\o}rgensen, {Lars Vincents} and Gisela Sj{\o}gaard",
year = "2004",
doi = "10.1007/s00421-003-0997-x",
language = "English",
volume = "91",
pages = "435--442",
journal = "European Journal of Applied Physiology",
issn = "1439-6319",
publisher = "Heinemann",
number = "4",

}

A physiological counterpoint to mechanistic estimates of "internal power" during cycling at different pedal rates. / Hansen, Ernst Albin; Jørgensen, Lars Vincents; Sjøgaard, Gisela.

I: European Journal of Applied Physiology, Bind 91, Nr. 4, 2004, s. 435-442.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - A physiological counterpoint to mechanistic estimates of "internal power" during cycling at different pedal rates

AU - Hansen, Ernst Albin

AU - Jørgensen, Lars Vincents

AU - Sjøgaard, Gisela

PY - 2004

Y1 - 2004

N2 - Reported values of "internal power" (IP) during cycling, generated by the muscles to overcome energy changes of moving body segments, are considerably different for various biomechanical models, reflecting the different criteria for estimation of IP. The present aim was to calculate IP from metabolic variables and to perform a physiological evaluation of five different kinematic models for calculating IP in cycling. Results showed that IP was statistically different between the kinematic models applied. IP based on metabolic variables (IP(met)) was 15, 41, and 91 W at 61, 88, and 115 rpm, respectively, being remarkably close to the kinematic estimate of one model (IP(Willems-COM): 14, 43, and 95 W) and reasonably close to another kinematic estimate (IP(Winter): 8, 29, and 81 W). For all kinematic models there was no significant effect of performing 3-D versus 2-D analyses. IP increased significantly with pedal rate - leg movements accounting for the largest fraction. Further, external power (EP) affected IP significantly such that IP was larger at moderate than at low EP at the majority of the pedal rates applied but on average this difference was only 8%.

AB - Reported values of "internal power" (IP) during cycling, generated by the muscles to overcome energy changes of moving body segments, are considerably different for various biomechanical models, reflecting the different criteria for estimation of IP. The present aim was to calculate IP from metabolic variables and to perform a physiological evaluation of five different kinematic models for calculating IP in cycling. Results showed that IP was statistically different between the kinematic models applied. IP based on metabolic variables (IP(met)) was 15, 41, and 91 W at 61, 88, and 115 rpm, respectively, being remarkably close to the kinematic estimate of one model (IP(Willems-COM): 14, 43, and 95 W) and reasonably close to another kinematic estimate (IP(Winter): 8, 29, and 81 W). For all kinematic models there was no significant effect of performing 3-D versus 2-D analyses. IP increased significantly with pedal rate - leg movements accounting for the largest fraction. Further, external power (EP) affected IP significantly such that IP was larger at moderate than at low EP at the majority of the pedal rates applied but on average this difference was only 8%.

KW - Adult

KW - Bicycling

KW - Biomechanics

KW - Computer Simulation

KW - Diagnosis, Computer-Assisted

KW - Energy Transfer

KW - Exercise Test

KW - Humans

KW - Male

KW - Models, Biological

KW - Muscle Contraction

KW - Muscle, Skeletal

KW - Oxygen Consumption

KW - Physical Exertion

KW - Reproducibility of Results

KW - Sensitivity and Specificity

U2 - 10.1007/s00421-003-0997-x

DO - 10.1007/s00421-003-0997-x

M3 - Journal article

C2 - 14639482

VL - 91

SP - 435

EP - 442

JO - European Journal of Applied Physiology

JF - European Journal of Applied Physiology

SN - 1439-6319

IS - 4

ER -