• Aucun résultat trouvé

Validity and reliability of the CycleOps Hammer direct drive trainer during sprint tests when compared with an SRM powermeter -a preliminary study

N/A
N/A
Protected

Academic year: 2021

Partager "Validity and reliability of the CycleOps Hammer direct drive trainer during sprint tests when compared with an SRM powermeter -a preliminary study"

Copied!
4
0
0

Texte intégral

(1)

HAL Id: hal-03124364

https://hal.univ-reims.fr/hal-03124364

Submitted on 28 Jan 2021

HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci- entific research documents, whether they are pub- lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers.

L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Validity and reliability of the CycleOps Hammer direct drive trainer during sprint tests when compared with an

SRM powermeter -a preliminary study

Sebastien Duc, Frédéric Puel, William Bertucci

To cite this version:

Sebastien Duc, Frédéric Puel, William Bertucci. Validity and reliability of the CycleOps Hammer direct drive trainer during sprint tests when compared with an SRM powermeter -a preliminary study.

Science & Cycling Congress, Jul 2019, Bruxelles, Belgium. pp.55-56. �hal-03124364�

(2)

See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/345939920

Validity and reliability of the CycleOps Hammer direct drive trainer during sprint tests when compared with an SRM powermeter – a preliminary study

Conference Paper · July 2019

CITATIONS

0

READS

17 4 authors, including:

Some of the authors of this publication are also working on these related projects:

studies of competitive swimming jammersView project

Proposition de thèse CircaPerfView project Sébastien Duc

Université de Reims Champagne-Ardenne 73PUBLICATIONS   512CITATIONS   

SEE PROFILE

Frédéric Puel

Université de Reims Champagne-Ardenne 37PUBLICATIONS   58CITATIONS   

SEE PROFILE

William Bertucci

University of Champagne-Ardenne (France) 162PUBLICATIONS   1,217CITATIONS   

SEE PROFILE

All content following this page was uploaded by Frédéric Puel on 16 November 2020.

The user has requested enhancement of the downloaded file.

(3)

Science & Cycling Congress, 3 and 4 July 2019, Brussels, Belgium. J Sci Cycling. Vol. 8(2), 55-56

© 2019 Science & Cycling Congress, 3 and 4 July 2019, Brussels, Belgium, licensee JSC. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

BOOK OF ABSTRACTS Open Access

Validity and reliability of the CycleOps

Hammer direct drive trainer during sprint tests when compared with an SRM powermeter – a preliminary study

Duc, S.  Selmi, M. Puel, F. Bertucci, W.

Purpose:

Coaches and cyclists often use direct drive home-trainers for measuring power output (PO) during testing and training.

Several devices like the Tacx Fortius (Peiffer et al., 2011: International Journal of Sports Medicine, 32, 353-356) and the Velotron trainer (Abbiss et al., 2009: International Journal of Sports Medicine, 30, 107-112) have been scientifically validated when compared to an SRM powermeter which is considered as the gold standard (Gardner et al., 2004: Medicine Science in Sports and Exercise, 36, 1252-1258). Contrarywise, others such as the Axiom Elite (Bertucci et al., 2005: International Journal of Sports Medicine, 26, 59-65) or the Kickr Power trainer (Zadow et al., 2016: International Journal of Sport Physiology and Performance, 11, 1115-1117) are less accurate and reliable. A recent study reported that the CycleOps Hammer provides valid and reliable PO measurements during graded exercise tests (100-500W). This validation procedure is nevertheless uncompleted as no comparison in maximal PO during all-out sprints have been done.

The purpose of this study was to assess the validity and reliability of PO measurement of three Cycleops Hammer trainer devices during maximal sprint tests when compared to an SRM powermeter.

Methods:

Three cyclists voluntarily participated in this study (Mean ± SD: 28 ± 9 years old; 1.81 ± 0.02 m; 72 ± 5 kg). Each subject performed three one-day laboratory test sessions separated by at least 48 h, that comprised successively: 1) one maximal graded exercise test (100-425 W) performed at a constant pedalling cadence (~90 rpm) ; 2) three 10-s all-out sprint tests against three different slope resistance (0.5%, 3%, 7%) ; 3) one 30-s all-out Wingate test (slope resistance of 3 %) ; and 4) a 20 min constant power test to study the potential power drift. All the tests were performed on the same road bike (Roubaix Tarmac, Specialized, USA) that was mounted on to a Hammer direct drive trainer (CycleOps, Madison, USA) and fitted with a SRM professional powermeter (SRM FSA K-Force Light, SRM GmbH, Jülich, Germany; accuracy ± 1 %). Prior to the study, the slope of the SRM powermeter was calibrated with set of weights. The zero offset of each device was performed according to the manufacturer’s recommendations before each test session. Power output (PO) and pedalling cadence (PC) were measured continuously by the two devices every second and stored in a GPS bike computer (Edge 520, Garmin, USA). The PO differences between the two devices was assessed by non-parametric Wilcoxon tests. To study the accuracy of each Hammer trainer, the relative bias of the PO differences between the SRM and the Hammer trainer and its 95% limits of agreement was defined using the Bland-Altman method. The 95% confidence interval (95%CI) for the relative bias was also calculated. All significant differences were set at p < 0.05. Only the data obtained during sprints and Wingate tests are presented in this abstract.

Results:

Significant differences in 1-s peak PO (sprints) and in 30-s mean PO (Wingate) were observed between the three Hammer devices and the SRM powermeter. When compared to the SRM powermeter, mean ± SD of bias for 1-s peak PO was 11.3

± 10.3 % for Hammer 1, 13.2 ± 12.7% for Hammer 2 and 21.1 ± 9.5% for Hammer 3. Mean ± SD of bias for 30-s mean PO was 4.3 ± 3.0% for Hammer 1, 1.7 ± 2.4% for Hammer 2 and 5.5 ± 1.0% for Hammer 3. No significant differences were found in maximal (sprint) and mean pedalling cadence (Wingate) whatever the Hammer device used.

PSMS Laboratory (EA7507), UFR STAPS, University of Reims Champagne- Ardenne, Reims, France

Contact email:

sebastien.duc@univ-reims.fr

(4)

Duc et al (2019).Validity and reliability of the CycleOps Hammer direct drive trainer during sprint tests when compared with an SRM powermeter – a preliminary study.

Conclusion:

These preliminary results seems to suggest that the CycleOps Hammer is not a valid device to measure PO with a high accuracy during all-out exercises as sprints. Nevertheless, according the lowest bias observed in 30-s mean PO during Wingate test, the overestimation of PO tends to decrease with increasing averaging time. Future studies should confirm it by increasing the sample size.

Figure 1. Bland-Altman plot of the three Hammer devices assessed during the 10-s sprint test (small symbol) and the 30-s Wingate test (large symbol) compared to the SRM powermeter. The dashed grey line represents the mean biais of the three devices whilst the dashed black lines showed the limits of agreement.

View publication stats View publication stats

Références

Documents relatifs

La méconnaissance des liens entre travail et santé résulte cependant tout autant de mécanismes sociaux et politiques qui conduisent les acteur.trices (y compris

Elena BERGAMINI, Pélagie GUILLON, Valentina CAMOMILLA, Helene PILLET, Wafa SKALLI, Aurelio CAPPOZZO - Trunk Inclination Estimate During the Sprint Start Using an Inertial

Between 20 and 30 m depth, the meadow is classified as medium density (Dn values around zero, i.e. close to the mean density) and high density, with the exception of a patch of

A series of dry tests were performed, at different vacuum levels, in order to compare the two methods of vacuum regulation (using a mechanical vacuum

The decomposition of RT, with respect to the EMG activity of response agonists, sheds light on the processes affected by exercise and suggests that exercise affects both sensory

2020). The aim of the present study was to determine whether such approach could be employed in an ani- mal model in order to i) follow the movements of the osteotome in the

Based on the results obtained in the context of hip implants, the same approach consisting in using an instrumented hammer was considered in a preliminary in vitro study

may be used to retrieve information on the material properties around the osteotome tip. A hammer equipped with a piezoelectric force sensor was used to impact 100 samples