Although a number of different methods have been proposed to assess the time to stabilization (TTS), none is reliable in every axis and no tests of this type have been carried out on children. The purpose of this study was thus to develop a new computational method to obtain TTS using a time-scale (frequency) approach [i.e. continuous wavelet transformation (WAV)] in children. Thirty normally-developed children (mean age 10.16 years, SD = 1.52) participated in the study. Every participant performed 30 single-leg drop jump landings with the dominant lower limb (barefoot) on a force plate from three different heights (15cm, 20cm and 25cm). Five signals were used to compute the TTS: i) Raw, ii) Root mean squared, iii) Sequential average processing, iv) the fitting curve of the signal using an unbounded third order polynomial fit, and v) WAV. The reliability of the TTS was determined by computing both the Intraclass Correlation Coefficient (ICC) and the Standard Error of the Measurement (SEM).In the antero-posterior and vertical axes, the values obtained with the WAV signal from all heights were similar to those obtained by raw, root mean squared and sequential average processing. The values obtained for the medio-lateral axis were relatively small. This WAV provided substantial-to-good ICC values and low SEM for almost all the axes and heights. The results of the current study thus suggest the WAV method could be used to compute overall TTS when studying children's dynamic postural stability.

AFIPS Research Group Department of Teaching of Music Visual and Corporal Expression University of Valencia Valencia Spain

Department of Human Movement Studies Human Motion Diagnostic Centre University of Ostrava Ostrava Czech Republic

HUMAG Research Group Department of Teaching of Music Visual and Corporal Expression University of Valencia Valencia Spain

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DuPrey KM, Liu K, Cronholm PF, Reisman AS, Collina SJ, Webner D, et al. Baseline Time to Stabilization Identifies Anterior Cruciate Ligament Rupture Risk in Collegiate Athletes. Am J Sports Med. 2016;44: 1487–1491. 10.1177/0363546516629635 PubMed DOI

Fransz DP, Huurnink A, de Boode VA, Kingma I, van Dieën JH. Time series of ground reaction forces following a single leg drop jump landing in elite youth soccer players consist of four distinct phases. Gait & Posture. 2016;50: 137–144. 10.1016/j.gaitpost.2016.09.002 PubMed DOI

Ross SE, Guskiewicz KM, Yu B. Single-leg jump-landing stabilization times in subjects with functionally unstable ankles. J Athl Train. 2005;40: 298–304. PubMed PMC

Shaw MY, Gribble PA, Frye JL. Ankle Bracing, Fatigue, and Time to Stabilization in Collegiate Volleyball Athletes. J Athl Train. 2008;43: 164–171. 10.4085/1062-6050-43.2.164 PubMed DOI PMC

Wright CJ, Arnold BL, Ross SE. Altered Kinematics and Time to Stabilization During Drop-Jump Landings in Individuals With or Without Functional Ankle Instability. J Athl Train. 2016;51: 5–15. 10.4085/1062-6050-51.2.10 PubMed DOI PMC

Wang Z, Newell KM. Inter-foot coordination dynamics of quiet standing postures. Neurosci Biobehav Rev. 2014;47: 194–202. 10.1016/j.neubiorev.2014.08.007 PubMed DOI

Raffalt PC, Alkjær T, Simonsen EB. Intra- and inter-subject variation in lower limb coordination during countermovement jumps in children and adults. Hum Mov Sci. 2016;46: 63–77. 10.1016/j.humov.2015.12.004 PubMed DOI

Thelen E. Motor Development: A New Synthesis. American Psychologist. 1995;50: 79–95. PubMed

Hutchinson AB, Yao P, Hutchinson MR. Single-leg balance and core motor control in children: when does the risk for ACL injury occurs? BMJ Open Sport Exerc Med. 2016;2: e000135 10.1136/bmjsem-2016-000135 PubMed DOI PMC

Fransz DP, Huurnink A, Kingma I, Verhagen EALM, van Dieën JH. A systematic review and meta-analysis of dynamic tests and related force plate parameters used to evaluate neuromusculoskeletal function in foot and ankle pathology. Clin Biomech (Bristol, Avon). 2013;28: 591–601. 10.1016/j.clinbiomech.2013.06.002 PubMed DOI

Fransz DP, Huurnink A, de Boode VA, Kingma I, van Dieën JH. Time to stabilization in single leg drop jump landings: an examination of calculation methods and assessment of differences in sample rate, filter settings and trial length on outcome values. Gait Posture. 2015;41: 63–69. 10.1016/j.gaitpost.2014.08.018 PubMed DOI

Liu K, Heise GD. The effect of jump-landing directions on dynamic stability. J Appl Biomech. 2013;29: 634–638. PubMed

Colby S, Hintermeister R, Torry M, Steadman J. Lower Limb Stability With ACL Impairment. J Orthop Sports Phys Ther. 1999;29: 444–454. 10.2519/jospt.1999.29.8.444 PubMed DOI

Fransz DP, Huurnink A, de Boode VA, Kingma I, van Dieën JH. The effect of the stability threshold on time to stabilization and its reliability following a single leg drop jump landing. J Biomech. 2016;49: 496–501. 10.1016/j.jbiomech.2015.12.048 PubMed DOI

Fransz DP, Huurnink A, de Boode VA, Kingma I, van Dieën JH. Corrigendum to “The effect of the stability threshold on time to stabilization and its reliability following a single leg drop jump landing” [J. Biomech. 49(3) (2016) 496–501]. J Biomech. 2017;63: 206–209. 10.1016/j.jbiomech.2017.07.036 PubMed DOI

McKay H, Tsang G, Heinonen A, MacKelvie K, Sanderson D, Khan KM. Ground reaction forces associated with an effective elementary school based jumping intervention. Br J Sports Med. 2005;39: 10–14. 10.1136/bjsm.2003.008615 PubMed DOI PMC

Lazaridis SN, Bassa EI, Patikas D, Hatzikotoulas K, Lazaridis FK, Kotzamanidis CM. Biomechanical comparison in different jumping tasks between untrained boys and men. Pediatr Exerc Sci. 2013;25: 101–113. PubMed

Walter SD, Eliasziw M, Donner A. Sample size and optimal designs for reliability studies. Statistics in Medicine. 1998;17: 101–110. 10.1002/(SICI)1097-0258(19980115)17:1<101::AID-SIM727>3.0.CO;2-E PubMed DOI

Bujang MA, Baharum N. A simplified guide to determination of sample size requirements for estimating the value of intraclass correlation coefficient: a review. Archives of Orofacial Sciences. 2017;12 Available: http://mymedr.afpm.org.my/publications/55349

García-Massó X, Huber MC, Friedmann J, Gonzalez LM, Schiller SM, Toca-Herrera JL. Automated detection of protein unfolding events in atomic force microscopy force curves. Microsc Res Tech. 2016;79: 1105–1111. 10.1002/jemt.22764 PubMed DOI

Kapoula Z, Matheron E, Demule E, Fauvel C, Bucci M-P. Postural Control during the Stroop Test in Dyslexic and Non Dyslexic Teenagers. PLoS One. 2011;6 10.1371/journal.pone.0019272 PubMed DOI PMC

Tulloch E, Phillips C, Sole G, Carman A, Abbott JH. DMA Clinical Pilates Directional-Bias Assessment: Reliability and Predictive Validity. J Orthop Sports Phys Ther. 2012;42: 676–687. 10.2519/jospt.2012.3790 PubMed DOI

Weir JP. Quantifying test-retest reliability using the intraclass correlation coefficient and the SEM. J Strength Cond Res. 2005;19: 231–240. 10.1519/15184.1 PubMed DOI

Petrie A, Sabin C. Medical statistics at a glance. Oxford: Blackwell Publishing; 2005.

Flanagan EP, Ebben WP, Jensen RL. Reliability of the reactive strength index and time to stabilization during depth jumps. J Strength Cond Res. 2008;22: 1677–1682. 10.1519/JSC.0b013e318182034b PubMed DOI

Children's Single-Leg Landing Movement Capability Analysis According to the Type of Sport Practiced

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