Test-Retest Reliability of a Static and Dynamic Motor Fatigability Protocol Using Grip and Pinch Strength in Children with Cerebral Palsy

Lieke Brauers; Rob Smeets; Peter Feys; Andrew M Gordon; Bertie Leij-Roelofsen; Caroline Bastiaenen; Eugene Rameckers; Katrijn Klingels

doi:10.1093/ptj/pzac088

Test-Retest Reliability of a Static and Dynamic Motor Fatigability Protocol Using Grip and Pinch Strength in Children with Cerebral Palsy

Lieke Brauers^*, Rob Smeets, Peter Feys, Andrew M Gordon, Bertie Leij-Roelofsen, Caroline Bastiaenen, Eugene Rameckers, Katrijn Klingels

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

OBJECTIVE: The purpose of this study was to investigate the test-retest reliability, measurement error, and interpretability of new motor fatigability outcomes of grip and pinch strength for children with unilateral cerebral palsy (UCP).

METHODS: Motor fatigability during grip and pinch strength was measured twice (within 48 hours) in both hands of 50 children (mean age = 11 years 2 months; 14, 31, and 5 children with Manual Ability Classification System levels I, II, and III, respectively) using a 30-second static and dynamic maximum-exertion protocol. For static motor fatigability, the Static Fatigue Index (SFI) and mean force (Fmean) in the first (Fmean1) and last (Fmean3) 10 seconds were calculated. For dynamic motor fatigability, Fmean1, Fmean3, and the number of peaks in the first (Npeaks1) and last (Npeaks3) 10 seconds were calculated.

RESULTS: For static motor fatigability, the ICCs were moderate to high for Fmean1 and Fmean3 (0.56-0.88), and the SFI showed low to moderate reliability (ICC = 0.32-0.72). For dynamic motor fatigability, the ICCs were moderate to high for all outcomes (0.54-0.91). The standard error of measurement agreement and the smallest detectable difference agreement were large in all outcomes, except for the SFI in static motor fatigability. Details per age group are provided. In general, younger children (6-11 years old) showed lower reliability than older children (12-18 years old).

CONCLUSION: Most outcome measures for static and dynamic motor fatigability of grip and pinch strength show moderate to high reliability in children with UCP, indicating that they can be used reliably to investigate the presence of motor fatigability in UCP, especially in older children. Standard Error of Measurement agreement and Smallest Detectable Difference agreement indicated that these outcome measures should be interpreted with caution when evaluating change.

Original language	English
Article number	pzac088
Number of pages	9
Journal	Physical Therapy
Volume	102
Issue number	10
Early online date	6 Jul 2022
DOIs	https://doi.org/10.1093/ptj/pzac088
Publication status	Published - 6 Oct 2022

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10.1093/ptj/pzac088

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@article{07834af28d6343168957ba83de1dc6b7,

title = "Test-Retest Reliability of a Static and Dynamic Motor Fatigability Protocol Using Grip and Pinch Strength in Children with Cerebral Palsy",

abstract = "OBJECTIVE: The purpose of this study was to investigate the test-retest reliability, measurement error, and interpretability of new motor fatigability outcomes of grip and pinch strength for children with unilateral cerebral palsy (UCP).METHODS: Motor fatigability during grip and pinch strength was measured twice (within 48 hours) in both hands of 50 children (mean age = 11 years 2 months; 14, 31, and 5 children with Manual Ability Classification System levels I, II, and III, respectively) using a 30-second static and dynamic maximum-exertion protocol. For static motor fatigability, the Static Fatigue Index (SFI) and mean force (Fmean) in the first (Fmean1) and last (Fmean3) 10 seconds were calculated. For dynamic motor fatigability, Fmean1, Fmean3, and the number of peaks in the first (Npeaks1) and last (Npeaks3) 10 seconds were calculated.RESULTS: For static motor fatigability, the ICCs were moderate to high for Fmean1 and Fmean3 (0.56-0.88), and the SFI showed low to moderate reliability (ICC = 0.32-0.72). For dynamic motor fatigability, the ICCs were moderate to high for all outcomes (0.54-0.91). The standard error of measurement agreement and the smallest detectable difference agreement were large in all outcomes, except for the SFI in static motor fatigability. Details per age group are provided. In general, younger children (6-11 years old) showed lower reliability than older children (12-18 years old).CONCLUSION: Most outcome measures for static and dynamic motor fatigability of grip and pinch strength show moderate to high reliability in children with UCP, indicating that they can be used reliably to investigate the presence of motor fatigability in UCP, especially in older children. Standard Error of Measurement agreement and Smallest Detectable Difference agreement indicated that these outcome measures should be interpreted with caution when evaluating change.",

author = "Lieke Brauers and Rob Smeets and Peter Feys and Gordon, {Andrew M} and Bertie Leij-Roelofsen and Caroline Bastiaenen and Eugene Rameckers and Katrijn Klingels",

note = "{\textcopyright} The Author(s) 2022. Published by Oxford University Press on behalf of the American Physical Therapy Association. All rights reserved. For permissions, please email: journals.permissions@oup.com.",

year = "2022",

month = oct,

day = "6",

doi = "10.1093/ptj/pzac088",

language = "English",

volume = "102",

journal = "Physical Therapy",

issn = "0031-9023",

publisher = "Oxford University Press",

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TY - JOUR

T1 - Test-Retest Reliability of a Static and Dynamic Motor Fatigability Protocol Using Grip and Pinch Strength in Children with Cerebral Palsy

AU - Brauers, Lieke

AU - Smeets, Rob

AU - Feys, Peter

AU - Gordon, Andrew M

AU - Leij-Roelofsen, Bertie

AU - Bastiaenen, Caroline

AU - Rameckers, Eugene

AU - Klingels, Katrijn

N1 - © The Author(s) 2022. Published by Oxford University Press on behalf of the American Physical Therapy Association. All rights reserved. For permissions, please email: journals.permissions@oup.com.

PY - 2022/10/6

Y1 - 2022/10/6

N2 - OBJECTIVE: The purpose of this study was to investigate the test-retest reliability, measurement error, and interpretability of new motor fatigability outcomes of grip and pinch strength for children with unilateral cerebral palsy (UCP).METHODS: Motor fatigability during grip and pinch strength was measured twice (within 48 hours) in both hands of 50 children (mean age = 11 years 2 months; 14, 31, and 5 children with Manual Ability Classification System levels I, II, and III, respectively) using a 30-second static and dynamic maximum-exertion protocol. For static motor fatigability, the Static Fatigue Index (SFI) and mean force (Fmean) in the first (Fmean1) and last (Fmean3) 10 seconds were calculated. For dynamic motor fatigability, Fmean1, Fmean3, and the number of peaks in the first (Npeaks1) and last (Npeaks3) 10 seconds were calculated.RESULTS: For static motor fatigability, the ICCs were moderate to high for Fmean1 and Fmean3 (0.56-0.88), and the SFI showed low to moderate reliability (ICC = 0.32-0.72). For dynamic motor fatigability, the ICCs were moderate to high for all outcomes (0.54-0.91). The standard error of measurement agreement and the smallest detectable difference agreement were large in all outcomes, except for the SFI in static motor fatigability. Details per age group are provided. In general, younger children (6-11 years old) showed lower reliability than older children (12-18 years old).CONCLUSION: Most outcome measures for static and dynamic motor fatigability of grip and pinch strength show moderate to high reliability in children with UCP, indicating that they can be used reliably to investigate the presence of motor fatigability in UCP, especially in older children. Standard Error of Measurement agreement and Smallest Detectable Difference agreement indicated that these outcome measures should be interpreted with caution when evaluating change.

AB - OBJECTIVE: The purpose of this study was to investigate the test-retest reliability, measurement error, and interpretability of new motor fatigability outcomes of grip and pinch strength for children with unilateral cerebral palsy (UCP).METHODS: Motor fatigability during grip and pinch strength was measured twice (within 48 hours) in both hands of 50 children (mean age = 11 years 2 months; 14, 31, and 5 children with Manual Ability Classification System levels I, II, and III, respectively) using a 30-second static and dynamic maximum-exertion protocol. For static motor fatigability, the Static Fatigue Index (SFI) and mean force (Fmean) in the first (Fmean1) and last (Fmean3) 10 seconds were calculated. For dynamic motor fatigability, Fmean1, Fmean3, and the number of peaks in the first (Npeaks1) and last (Npeaks3) 10 seconds were calculated.RESULTS: For static motor fatigability, the ICCs were moderate to high for Fmean1 and Fmean3 (0.56-0.88), and the SFI showed low to moderate reliability (ICC = 0.32-0.72). For dynamic motor fatigability, the ICCs were moderate to high for all outcomes (0.54-0.91). The standard error of measurement agreement and the smallest detectable difference agreement were large in all outcomes, except for the SFI in static motor fatigability. Details per age group are provided. In general, younger children (6-11 years old) showed lower reliability than older children (12-18 years old).CONCLUSION: Most outcome measures for static and dynamic motor fatigability of grip and pinch strength show moderate to high reliability in children with UCP, indicating that they can be used reliably to investigate the presence of motor fatigability in UCP, especially in older children. Standard Error of Measurement agreement and Smallest Detectable Difference agreement indicated that these outcome measures should be interpreted with caution when evaluating change.

U2 - 10.1093/ptj/pzac088

DO - 10.1093/ptj/pzac088

M3 - Article

C2 - 35793460

SN - 0031-9023

VL - 102

JO - Physical Therapy

JF - Physical Therapy

IS - 10

M1 - pzac088

ER -