Validating two systems for estimating force and power

Blair T Crewther, Liam P Kilduff, D.J. Cunningham, C. Cook, N. Owen, G.-Z. Yang

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

This study examined the validity of 2 kinematic systems for estimating force and power during squat jumps. 12 weight-trained males each performed single repetition squat jumps with a 20-kg, 40-kg, 60-kg and 80-kg load on a Kistler portable force plate. A commercial linear position transducer (Gymaware [GYM]) and accelerometer (Myotest® [MYO]) were attached to the bar to assess concentric peak force (PF) and peak power (PP). Across all loads tested, the GYM and MYO estimates of PF and PP were moderately to strongly correlated (P0.05-0.001) with the force plate measurements (r=0.59-0.87 and r=0.66-0.97), respectively. The mean PF and PP values were not significantly different between the 2 kinematic systems and the force plate, but the estimates did produce some systematic bias and relatively large random errors, especially with the 20-kg load (PF bias >170 N, PF error >335 N, PP bias >400 W, PP error >878 W). Some proportional bias was also identified. In summary, the estimation of PF and PP by a linear position transducer and accelerometer showed moderate to strong relative validity and equivalent absolute validity, but these estimates are limited by the presence of bias and large random errors. © Georg Thieme Verlag KG Stuttgart - New York.
Original languageEnglish
Pages (from-to)254-258
Number of pages5
JournalInternational Journal of Sports Medicine
Volume32
Issue number4
DOIs
Publication statusPublished - 2011
Externally publishedYes

Fingerprint

Transducers
Biomechanical Phenomena
Weights and Measures

Cite this

Crewther, B. T., Kilduff, L. P., Cunningham, D. J., Cook, C., Owen, N., & Yang, G-Z. (2011). Validating two systems for estimating force and power. International Journal of Sports Medicine, 32(4), 254-258. https://doi.org/10.1055/s-0030-1270487
Crewther, Blair T ; Kilduff, Liam P ; Cunningham, D.J. ; Cook, C. ; Owen, N. ; Yang, G.-Z. / Validating two systems for estimating force and power. In: International Journal of Sports Medicine. 2011 ; Vol. 32, No. 4. pp. 254-258.
@article{b5fdbf73fa424b61974d06f77e073bbd,
title = "Validating two systems for estimating force and power",
abstract = "This study examined the validity of 2 kinematic systems for estimating force and power during squat jumps. 12 weight-trained males each performed single repetition squat jumps with a 20-kg, 40-kg, 60-kg and 80-kg load on a Kistler portable force plate. A commercial linear position transducer (Gymaware [GYM]) and accelerometer (Myotest{\circledR} [MYO]) were attached to the bar to assess concentric peak force (PF) and peak power (PP). Across all loads tested, the GYM and MYO estimates of PF and PP were moderately to strongly correlated (P0.05-0.001) with the force plate measurements (r=0.59-0.87 and r=0.66-0.97), respectively. The mean PF and PP values were not significantly different between the 2 kinematic systems and the force plate, but the estimates did produce some systematic bias and relatively large random errors, especially with the 20-kg load (PF bias >170 N, PF error >335 N, PP bias >400 W, PP error >878 W). Some proportional bias was also identified. In summary, the estimation of PF and PP by a linear position transducer and accelerometer showed moderate to strong relative validity and equivalent absolute validity, but these estimates are limited by the presence of bias and large random errors. {\circledC} Georg Thieme Verlag KG Stuttgart - New York.",
keywords = "acceleration, force plate, kinematic, kinetic",
author = "Crewther, {Blair T} and Kilduff, {Liam P} and D.J. Cunningham and C. Cook and N. Owen and G.-Z. Yang",
note = "Cited By :30 Export Date: 25 May 2017",
year = "2011",
doi = "10.1055/s-0030-1270487",
language = "English",
volume = "32",
pages = "254--258",
journal = "International Journal of Sports Medicine",
issn = "0172-4622",
publisher = "Georg Thieme Verlag",
number = "4",

}

Crewther, BT, Kilduff, LP, Cunningham, DJ, Cook, C, Owen, N & Yang, G-Z 2011, 'Validating two systems for estimating force and power', International Journal of Sports Medicine, vol. 32, no. 4, pp. 254-258. https://doi.org/10.1055/s-0030-1270487

Validating two systems for estimating force and power. / Crewther, Blair T; Kilduff, Liam P; Cunningham, D.J.; Cook, C.; Owen, N.; Yang, G.-Z.

In: International Journal of Sports Medicine, Vol. 32, No. 4, 2011, p. 254-258.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Validating two systems for estimating force and power

AU - Crewther, Blair T

AU - Kilduff, Liam P

AU - Cunningham, D.J.

AU - Cook, C.

AU - Owen, N.

AU - Yang, G.-Z.

N1 - Cited By :30 Export Date: 25 May 2017

PY - 2011

Y1 - 2011

N2 - This study examined the validity of 2 kinematic systems for estimating force and power during squat jumps. 12 weight-trained males each performed single repetition squat jumps with a 20-kg, 40-kg, 60-kg and 80-kg load on a Kistler portable force plate. A commercial linear position transducer (Gymaware [GYM]) and accelerometer (Myotest® [MYO]) were attached to the bar to assess concentric peak force (PF) and peak power (PP). Across all loads tested, the GYM and MYO estimates of PF and PP were moderately to strongly correlated (P0.05-0.001) with the force plate measurements (r=0.59-0.87 and r=0.66-0.97), respectively. The mean PF and PP values were not significantly different between the 2 kinematic systems and the force plate, but the estimates did produce some systematic bias and relatively large random errors, especially with the 20-kg load (PF bias >170 N, PF error >335 N, PP bias >400 W, PP error >878 W). Some proportional bias was also identified. In summary, the estimation of PF and PP by a linear position transducer and accelerometer showed moderate to strong relative validity and equivalent absolute validity, but these estimates are limited by the presence of bias and large random errors. © Georg Thieme Verlag KG Stuttgart - New York.

AB - This study examined the validity of 2 kinematic systems for estimating force and power during squat jumps. 12 weight-trained males each performed single repetition squat jumps with a 20-kg, 40-kg, 60-kg and 80-kg load on a Kistler portable force plate. A commercial linear position transducer (Gymaware [GYM]) and accelerometer (Myotest® [MYO]) were attached to the bar to assess concentric peak force (PF) and peak power (PP). Across all loads tested, the GYM and MYO estimates of PF and PP were moderately to strongly correlated (P0.05-0.001) with the force plate measurements (r=0.59-0.87 and r=0.66-0.97), respectively. The mean PF and PP values were not significantly different between the 2 kinematic systems and the force plate, but the estimates did produce some systematic bias and relatively large random errors, especially with the 20-kg load (PF bias >170 N, PF error >335 N, PP bias >400 W, PP error >878 W). Some proportional bias was also identified. In summary, the estimation of PF and PP by a linear position transducer and accelerometer showed moderate to strong relative validity and equivalent absolute validity, but these estimates are limited by the presence of bias and large random errors. © Georg Thieme Verlag KG Stuttgart - New York.

KW - acceleration

KW - force plate

KW - kinematic

KW - kinetic

U2 - 10.1055/s-0030-1270487

DO - 10.1055/s-0030-1270487

M3 - Article

VL - 32

SP - 254

EP - 258

JO - International Journal of Sports Medicine

JF - International Journal of Sports Medicine

SN - 0172-4622

IS - 4

ER -

Crewther BT, Kilduff LP, Cunningham DJ, Cook C, Owen N, Yang G-Z. Validating two systems for estimating force and power. International Journal of Sports Medicine. 2011;32(4):254-258. https://doi.org/10.1055/s-0030-1270487