The Landing Error Scoring System (LESS) and Lower Limb Power Profiles in Elite Rugby Union Players

# Background The Landing Error Scoring System (LESS) is a clinical test that assesses landing biomechanics during a drop-jump task. Performance measures such as jump height, power, contact time and reactive strength index are used commonly in athletic populations. Comparing results from the LESS a...

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Autores principales:	Stephen Rowell, Nicola Relph
Formato:	article
Lenguaje:	EN
Publicado:	North American Sports Medicine Institute 2021
Materias:	Sports medicine RC1200-1245
Acceso en línea:	https://doaj.org/article/5d9cfe60ede842299f20ee314846720a
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spelling	oai:doaj.org-article:5d9cfe60ede842299f20ee314846720a2021-12-02T17:36:29ZThe Landing Error Scoring System (LESS) and Lower Limb Power Profiles in Elite Rugby Union Players2159-2896https://doaj.org/article/5d9cfe60ede842299f20ee314846720a2021-10-01T00:00:00Zhttps://ijspt.scholasticahq.com/article/27632-the-landing-error-scoring-system-less-and-lower-limb-power-profiles-in-elite-rugby-union-players.pdfhttps://doaj.org/toc/2159-2896# Background The Landing Error Scoring System (LESS) is a clinical test that assesses landing biomechanics during a drop-jump task. Performance measures such as jump height, power, contact time and reactive strength index are used commonly in athletic populations. Comparing results from the LESS against these performance measures has not been reported in elite rugby union. # Purpose To report i.) normative LESS scores for elite rugby union players ii.) correlations between LESS scores and performance measures and iii.) differences in performance measures between LESS scoring groups. A secondary purpose was to report the intra- and inter-rater reliability of the LESS test when used in elite rugby union players. # Study Design Cross-sectional design. # Methods Thirty-six male, elite rugby union players participated. Each participant completed three trials of the LESS and performance measures were recorded concurrently using the Optojump^TM^. LESS trials were scored independently by the authors. Statistical analyses were used to confirm reliability, data normality, and between group differences (p<0.05). # Results The LESS test is a reliable testing tool in elite rugby union players (excellent intra- (ICC=0.96) and inter-rater (ICC=0.94) reliability). One player demonstrated an excellent LESS score, six players had good scores, eight players moderate scores and the majority of the group, 21 players, scored poorly. LESS scores were correlated to contact time (r = -0.461, p = 0.005) only. Participants with moderate to poor LESS scores (a score ≤5) produced greater power (p=0.036, η2 = 0.139), contact time (p=0.002, η2 = 0.268) and reactive strength index (p=0.016, η2 = 0.180). There were no differences in jump height (p=0.842) between players scoring excellent to good and moderate to poor. # Conclusion The results of the current study demonstrate excellent intra- and inter-rater reliability for the LESS, supporting its use as a clinical assessment tool in elite rugby union players. The majority of players presented with moderate to poor LESS scores, indicating an area of concern in this population. Participants scoring moderate to poor in the LESS recorded significantly higher power and reactive strength index, increased contact time but not jump height. This suggests participants with high-risk landing biomechanics may also produce higher performance measures, but these do not necessarily result in an improved jump height.Stephen RowellNicola RelphNorth American Sports Medicine InstitutearticleSports medicineRC1200-1245ENInternational Journal of Sports Physical Therapy, Vol 16, Iss 5 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Sports medicine RC1200-1245
spellingShingle	Sports medicine RC1200-1245 Stephen Rowell Nicola Relph The Landing Error Scoring System (LESS) and Lower Limb Power Profiles in Elite Rugby Union Players
description	# Background The Landing Error Scoring System (LESS) is a clinical test that assesses landing biomechanics during a drop-jump task. Performance measures such as jump height, power, contact time and reactive strength index are used commonly in athletic populations. Comparing results from the LESS against these performance measures has not been reported in elite rugby union. # Purpose To report i.) normative LESS scores for elite rugby union players ii.) correlations between LESS scores and performance measures and iii.) differences in performance measures between LESS scoring groups. A secondary purpose was to report the intra- and inter-rater reliability of the LESS test when used in elite rugby union players. # Study Design Cross-sectional design. # Methods Thirty-six male, elite rugby union players participated. Each participant completed three trials of the LESS and performance measures were recorded concurrently using the Optojump^TM^. LESS trials were scored independently by the authors. Statistical analyses were used to confirm reliability, data normality, and between group differences (p<0.05). # Results The LESS test is a reliable testing tool in elite rugby union players (excellent intra- (ICC=0.96) and inter-rater (ICC=0.94) reliability). One player demonstrated an excellent LESS score, six players had good scores, eight players moderate scores and the majority of the group, 21 players, scored poorly. LESS scores were correlated to contact time (r = -0.461, p = 0.005) only. Participants with moderate to poor LESS scores (a score ≤5) produced greater power (p=0.036, η2 = 0.139), contact time (p=0.002, η2 = 0.268) and reactive strength index (p=0.016, η2 = 0.180). There were no differences in jump height (p=0.842) between players scoring excellent to good and moderate to poor. # Conclusion The results of the current study demonstrate excellent intra- and inter-rater reliability for the LESS, supporting its use as a clinical assessment tool in elite rugby union players. The majority of players presented with moderate to poor LESS scores, indicating an area of concern in this population. Participants scoring moderate to poor in the LESS recorded significantly higher power and reactive strength index, increased contact time but not jump height. This suggests participants with high-risk landing biomechanics may also produce higher performance measures, but these do not necessarily result in an improved jump height.
format	article
author	Stephen Rowell Nicola Relph
author_facet	Stephen Rowell Nicola Relph
author_sort	Stephen Rowell
title	The Landing Error Scoring System (LESS) and Lower Limb Power Profiles in Elite Rugby Union Players
title_short	The Landing Error Scoring System (LESS) and Lower Limb Power Profiles in Elite Rugby Union Players
title_full	The Landing Error Scoring System (LESS) and Lower Limb Power Profiles in Elite Rugby Union Players
title_fullStr	The Landing Error Scoring System (LESS) and Lower Limb Power Profiles in Elite Rugby Union Players
title_full_unstemmed	The Landing Error Scoring System (LESS) and Lower Limb Power Profiles in Elite Rugby Union Players
title_sort	landing error scoring system (less) and lower limb power profiles in elite rugby union players
publisher	North American Sports Medicine Institute
publishDate	2021
url	https://doaj.org/article/5d9cfe60ede842299f20ee314846720a
work_keys_str_mv	AT stephenrowell thelandingerrorscoringsystemlessandlowerlimbpowerprofilesineliterugbyunionplayers AT nicolarelph thelandingerrorscoringsystemlessandlowerlimbpowerprofilesineliterugbyunionplayers AT stephenrowell landingerrorscoringsystemlessandlowerlimbpowerprofilesineliterugbyunionplayers AT nicolarelph landingerrorscoringsystemlessandlowerlimbpowerprofilesineliterugbyunionplayers
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The Landing Error Scoring System (LESS) and Lower Limb Power Profiles in Elite Rugby Union Players

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