Reliability, familiarization effect, and comparisons between a predetermined and a self-determined isometric-squat testing protocol

Cillian D. McGoldrick*, Antonio Dello Iacono, Oliver J. Morgan, Jack Nayler, Janice Buchanan, Christopher McCart, Viswanath B. Unnithan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
11 Downloads (Pure)

Abstract

Purpose: This study examined the interday reliability of a predetermined and a self-determined isometric-squat test among youth soccer players. Familiarization effects were evaluated to determine the minimum number of trials necessary to obtain consistent outputs. Finally, differences between protocols were evaluated.

Methods: Thirty-one youth soccer players (mean [SD] age: 13.2 [1.0] y; body mass: 54.1 [3.4] kg; stature: 166.3 [11.2] cm; percentage of estimated adult height: 92.6% [3.6%]) from a top-tier professional academy completed 4 experimental sessions for each protocol: familiarization 1, familiarization 2, test, and retest sessions. Peak force; relative peak force; impulse from 0 to 50 milliseconds, 0 to 100 milliseconds, 0 to 150 milliseconds, and 0 to 200 milliseconds; and rate of force development from 0 to 50 milliseconds, 0 to 100 milliseconds, 0 to 150 milliseconds, and 0 to 200 milliseconds were measured.

Results: Both protocols displayed acceptable (intraclass correlation coefficient >=.75 and coefficient of variation ≤10%) reliability statistics for all metrics apart from rate of force development of any time epoch. Differences were found between familiarization 2 and both test and retest sessions for peak force (P = .034 and .021, respectively) and relative peak force (P = .035 and .005, respectively) across both protocols. 

Conclusions
:
 The isometric-squat test is a reliable test among youth soccer players. Two familiarization sessions seem to be sufficient to ensure data stabilization. Outputs between the self-determined and predetermined are comparable; however, the latter seems preferable due to improved testing time efficiency.
Original languageEnglish
Pages (from-to)718-725
Number of pages8
JournalInternational Journal of Sports Physiology and Performance
Volume18
Issue number7
Early online date19 May 2023
DOIs
Publication statusPublished - 31 Jul 2023

Keywords

  • strength
  • power
  • assessment
  • self-determination
  • autonomy

Fingerprint

Dive into the research topics of 'Reliability, familiarization effect, and comparisons between a predetermined and a self-determined isometric-squat testing protocol'. Together they form a unique fingerprint.

Cite this