PMID: 15235334Jul 6, 2004Paper

Accuracy of SRM and power tap power monitoring systems for bicycling

Medicine and Science in Sports and Exercise
Andrew S GardnerDavid Jenkins

Abstract

: Although manufacturers of bicycle power monitoring devices SRM and Power Tap (PT) claim accuracy to within 2.5%, there are limited scientific data available in support. The purpose of this investigation was to assess the accuracy of SRM and PT under different conditions. : First, 19 SRM were calibrated, raced for 11 months, and retested using a dynamic CALRIG (50-1000 W at 100 rpm). Second, using the same procedure, five PT were repeat tested on alternate days. Third, the most accurate SRM and PT were tested for the influence of cadence (60, 80, 100, 120 rpm), temperature (8 and 21 degrees C) and time (1 h at ~300 W) on accuracy. Finally, the same SRM and PT were downloaded and compared after random cadence and gear surges using the CALRIG and on a training ride. : The mean error scores for SRM and PT factory calibration over a range of 50 - 1000 W were 2.3 +/- 4.9% and -2.5 +/- 0.5%, respectively. A second set of trials provided stable results for 15 calibrated SRM after 11 months (-0.8 +/- 1.7%), and follow-up testing of all PT units confirmed these findings (-2.7 +/- 0.1%). Accuracy for SRM and PT was not largely influenced by time and cadence; however, power output readings were noticeably influenced by temperature (5.2% ...Continue Reading

References

May 1, 1994·International Journal of Sports Medicine·G F WoodsB F Maxwell
Aug 1, 1993·Journal of Applied Physiology·T S OldsN P Craig
Oct 1, 1998·European Journal of Applied Physiology and Occupational Physiology·B F MaxwellL Day
Apr 3, 1999·Medicine and Science in Sports and Exercise·W G HopkinsL M Burke
Dec 10, 1999·Medicine and Science in Sports and Exercise·D R BassettE R Burke
Dec 10, 1999·Medicine and Science in Sports and Exercise·J P BrokerE R Burke
Jul 27, 2000·Medicine and Science in Sports and Exercise· MacRae HS-HP J Allen
Oct 20, 2000·Medicine and Science in Sports and Exercise·J BalmerS R Bird
Apr 5, 2001·Sports Medicine·W G HopkinsJ A Hawley
Jun 29, 2001·Sports Medicine·T Olds
Jan 1, 1998·Journal of Sports Sciences·A Jeukendrup, A VanDiemen
Aug 1, 1998·Journal of Applied Biomechanics·James C MartinAndrew R Coggan

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Citations

Apr 3, 2009·European Journal of Applied Physiology·Yann Le MeurThierry Bernard
Jun 3, 2011·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Lindsay M EdwardsKieran Clarke
Sep 10, 2005·European Journal of Applied Physiology·Tammie R EbertRobert T Withers
Jun 15, 2007·European Journal of Applied Physiology·A Scott GardnerDavid G Jenkins
Mar 26, 2009·European Journal of Applied Physiology·David J BentleyDavid Cameron-Smith
Jan 9, 2010·European Journal of Applied Physiology·Laura A GarvicanChristopher J Gore
Nov 30, 2010·European Journal of Applied Physiology·Laura A GarvicanChristopher J Gore
Jan 12, 2011·European Journal of Applied Physiology·Jesús García-PallarésMikel Izquierdo
Dec 2, 2008·Journal of Biomechanics·Aldo SassiAndrea Morelli
May 23, 2012·Scandinavian Journal of Medicine & Science in Sports·B X Disley, F-X Li
Apr 1, 2014·Applied Ergonomics·Steven J Elmer, James C Martin
May 7, 2015·Scandinavian Journal of Medicine & Science in Sports·A KarlsenS Racinais
Oct 2, 2012·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·S A JobsonL Passfield
Oct 31, 2014·Journal of Sports Sciences·Julien Pinot, Frederic Grappe
Sep 28, 2014·European Journal of Applied Physiology·B KarstenC Beedie
Dec 3, 2015·PloS One·Laura A Garvican-LewisPaolo Menaspà
Oct 1, 2016·Journal of Sports Sciences·L PassfieldM Zabala
Aug 24, 2016·Journal of Sports Sciences·Barney WainwrightJohn Paul O'Hara
Nov 23, 2006·Journal of Sports Sciences·Howard Thomas Hurst, Stephen Atkins
Sep 6, 2007·Journal of Sports Sciences·Stefan VogtLothar Heinrich
Oct 19, 2007·Journal of Sports Sciences·Juan García-LópezJosé Gerardo Villa
May 30, 2013·Journal of Sports Sciences·William M BertucciRaoul F Reiser
Feb 11, 2014·International Journal of Sports Physiology and Performance·Rodrigo R Bini, Patria A Hume
Feb 11, 2014·International Journal of Sports Physiology and Performance·Philip F SkibaAndrew M Jones
Jan 31, 2014·Journal of Strength and Conditioning Research·Molly E MierasDustin R Slivka
Nov 16, 2013·International Journal of Sports Physiology and Performance·Naroa EtxebarriaRichard A Ferguson
Sep 13, 2008·Foot & Ankle International·Heiner BaurFrank Mayer
Jan 17, 2012·Research in Sports Medicine·David J BentleyIan Spence
Nov 29, 2017·International Journal of Sports Physiology and Performance·José R Lillo-Bevia, Jesús G Pallarés
Apr 14, 2018·International Journal of Sports Physiology and Performance·Theo OuvrardFrederic Grappe
May 11, 2018·International Journal of Sports Physiology and Performance·Pedro L ValenzuelaPedro de la Villa
Dec 28, 2018·European Journal of Sport Science·Dajo Sanders, Mathieu Heijboer
May 29, 2010·Medicine and Science in Sports and Exercise·Megan L R RossLouise M Burke
Jul 8, 2010·Clinical Journal of Sport Medicine : Official Journal of the Canadian Academy of Sport Medicine·Stephen J McGregorMelvyn Rubenfire
Nov 6, 2018·Journal of Sports Sciences·Paul T MorganAnni Vanhatalo
Jan 6, 2006·Medicine and Science in Sports and Exercise·Stefan VogtAndreas Schmid
Mar 17, 2006·Medicine and Science in Sports and Exercise·James C MartinDavid T Martin
Apr 24, 2019·Disability and Rehabilitation. Assistive Technology·Bryce Dyer, B Xavier Disley
Nov 1, 2005·Canadian Journal of Applied Physiology = Revue Canadienne De Physiologie Appliquée·John McDanielJames C Martin

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