Agreement between Powertap, Quarq and Stages power meters for cross-country mountain biking

Miller, Matthew C.; Macdermid, Paul W.; Fink, Philip W.; Stannard, Stephen R.

doi:10.1080/19346182.2015.1108979

Cited by 19 publications

(18 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The precision values of the current study are in line with previous results from numerous SRM and PowerTap power meters (CV < 2 %) [9]. Some studies that tested single devices reported slightly higher CV values (1-3 % for PowerTap and SRM [5]; 2-3 % for PowerTap, Quarq and Stages [20]; 2 % for PowerTap and SRM and 4 % for Ergomo ® Pro [8]).…”

Section: Precisionsupporting

confidence: 91%

“…The numerous studies analysing the agreement between simultaneously installed power meters are difficult to interpret [1, 3-5, 8, 13, 20, 23] because generalisations from individual power meters to their respective manufacturers are highly limited, as Gardner et al [9] and the current study illustrate. However, direct system-to-system comparisons revealed differences comparable to the current study or higher (1-2 % between Power-Tap and SRM [5]; 0-12 % between PowerTap, Quarq and Stages [20]; 2-17 % between PowerTap, SRM and Ergomo®Pro [8]).…”

Section: Truenesssupporting

confidence: 51%

“…Additionally, only short measurement periods were analysed in contrast to longer recordings that are typically used for training and testing. However, accurate measurements in controlled conditions are presumably necessary for high accuracy under field conditions [20]. Further research in this area could investigate the accuracy of a high number of power meters under field conditions.…”

Section: Limitationsmentioning

confidence: 99%

“…Therefore, numerous studies have compared power meters by installing them simultaneously on the same bike and comparing their measurements. The results varied tremendously with differences from 1.2 [5] to 16.5 % [8], depending on the power meters used, the range of measured power output, and the calibration protocols [20]. Apart from SRM and PowerTap, power meters from Quarq [20] and Stages [13] were calibrated in this way.…”

Section: Introductionmentioning

confidence: 99%

“…The results varied tremendously with differences from 1.2 [5] to 16.5 % [8], depending on the power meters used, the range of measured power output, and the calibration protocols [20]. Apart from SRM and PowerTap, power meters from Quarq [20] and Stages [13] were calibrated in this way. However, this experimental setup lacks a first principle-based reference against which to compare the power meters.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Accuracy of Cycling Power Meters against a Mathematical Model of Treadmill Cycling

et al. 2017

View full text Add to dashboard Cite

The aim of this study was to compare the accuracy among a high number of current mobile cycling power meters used by elite and recreational cyclists against a first principle-based mathematical model of treadmill cycling. 54 power meters from 9 manufacturers used by 32 cyclists were calibrated. While the cyclist coasted downhill on a motorised treadmill, a back-pulling system was adjusted to counter the downhill force. The system was then loaded 3 times with 4 different masses while the cyclist pedalled to keep his position. The mean deviation (trueness) to the model and coefficient of variation (precision) were analysed. The mean deviations of the power meters were –0.9±3.2% (mean±SD) with 6 power meters deviating by more than±5%. The coefficients of variation of the power meters were 1.2±0.9% (mean±SD), with Stages varying more than SRM (p<0.001) and PowerTap (p<0.001). In conclusion, current power meters used by elite and recreational cyclists vary considerably in their trueness; precision is generally high but differs between manufacturers. Calibrating and adjusting the trueness of every power meter against a first principle-based reference is advised for accurate measurements.

show abstract

Section: Precisionsupporting

confidence: 91%

Section: Truenesssupporting

confidence: 51%

Section: Limitationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Accuracy of Cycling Power Meters against a Mathematical Model of Treadmill Cycling

et al. 2017

View full text Add to dashboard Cite

show abstract

Road gradient and cycling power: An observational study in male professional cyclists

Mateo‐March¹,

Muriel²,

Zabala³

et al. 2022

Journal of Science and Medicine in Sport

View full text Add to dashboard Cite

Validity of a device designed to measure braking power in bicycle disc brakes

Miller

Fink

Macdermid

et al. 2017

Sports Biomechanics

View full text Add to dashboard Cite

Real-world cycling performance depends not only on exercise capacities, but also on efficiently traversing the bicycle through the terrain. The aim of this study was to determine if it was possible to quantify the braking done by a cyclist in the field. One cyclist performed 408 braking trials (348 on a flat road; 60 on a flat dirt path) over 5 days on a bicycle fitted with brake torque and angular velocity sensors to measure brake power. Based on Newtonian physics, the sum of brake work, aerodynamic drag and rolling resistance was compared with the change in kinetic energy in each braking event. Strong linear relationships between the total energy removed from the bicycle-rider system through braking and the change in kinetic energy were observed on the tar-sealed road (r = 0.989; p < 0.0001) and the dirt path (r = 0.952; p < 0.0001). T-tests revealed no difference between the total energy removed and the change in kinetic energy on the road (p = 0.715) or dirt (p = 0.128). This study highlights that brake torque and angular velocity sensors are valid for calculating brake power on the disc brakes of a bicycle in field conditions. Such a device may be useful for investigating cyclists' ability to traverse through various terrains.

show abstract

Agreement between Powertap, Quarq and Stages power meters for cross-country mountain biking

Cited by 19 publications

References 20 publications

Accuracy of Cycling Power Meters against a Mathematical Model of Treadmill Cycling

Accuracy of Cycling Power Meters against a Mathematical Model of Treadmill Cycling

Road gradient and cycling power: An observational study in male professional cyclists

Validity of a device designed to measure braking power in bicycle disc brakes

Contact Info

Product

Resources

About