International Journal of Human Movement and Sports Sciences Vol. 9(6), pp. 1460 - 1469
DOI: 10.13189/saj.2021.090643
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Analysis of Single Leg Squat and Single Leg Landing Performance Variability among Professional Soccer Players Across a Season

Msaad Alzhrani ^1,*, Ahmad Alanazi ¹, Mazen Alqahtani ¹, Mohamed Sherif Sirajudeen ¹, Lee Herrington ², Richard K. Jones ^3
1 Department of Physical Therapy & Health Rehabilitation, College of Applied Medical Sciences, Majmaah University, Majmaah 11952, Saudi Arabia
² Centre for Health Sciences Research, University of Salford, Salford, Manchester, UK
³ School of Health Science, University of Salford, Salford, UK

ABSTRACT

Objectives: This study investigated the performance variability between limb type (dominant versus non-dominant leg) with regard to time (over season with three categories: pre-, start- and end-season) of professional soccer players. Methods: A total of 88 out of 124 male soccer players aged 16-30 years were asked to perform the specific athletic tasks single leg squat (SLS) and single leg landing (SLL) during different times in a full sports season. These functional tasks were evaluated using outcome measures of coefficient of variation, including frontal plane projection angle (FPPA) and hip adduction angle (HAA). Results: No significant difference was observed across all events between the dominant and non-dominant leg of the participants between screening sessions over time, for both SLS and SLL functional activities, except for one event in both second-order coefficient of variation for FFPA (FPPA V2) and HAA in SLS (at the start of season, p =0.006). The variations in FPPA and HA are clinically irrelevant, as no statistically significant differences were observed between limb types (dominant versus non-dominant leg) between screening sessions over a season, thereby suggesting that the performance variability is fairly consistent over time. Conclusions: There is consistency across the sports season in the performance variability of SLS and SLL.

KEYWORDS
Anterior Cruciate Ligament, Knee Injury, Single Leg Squat, Single Leg Land, Frontal Plane Projection Angle, Performance Variability

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Msaad Alzhrani , Ahmad Alanazi , Mazen Alqahtani , Mohamed Sherif Sirajudeen , Lee Herrington , Richard K. Jones , "Analysis of Single Leg Squat and Single Leg Landing Performance Variability among Professional Soccer Players Across a Season," International Journal of Human Movement and Sports Sciences, Vol. 9, No. 6, pp. 1460 - 1469, 2021. DOI: 10.13189/saj.2021.090643.

(b). APA Format:
Msaad Alzhrani , Ahmad Alanazi , Mazen Alqahtani , Mohamed Sherif Sirajudeen , Lee Herrington , Richard K. Jones (2021). Analysis of Single Leg Squat and Single Leg Landing Performance Variability among Professional Soccer Players Across a Season. International Journal of Human Movement and Sports Sciences, 9(6), 1460 - 1469. DOI: 10.13189/saj.2021.090643.