Sains Malaysiana 48(10)(2019): 2177–2183

http://dx.doi.org/10.17576/jsm-2019-4810-13

Relationships between Core Strength, Dynamic Balance and Knee Valgus during Single Leg Squat in Male Junior Athletes

(Hubungan antara Kekuatan Teras, Keseimbangan Dinamik serta Kinematik Lutut semasa Mencangkung dengan Sebelah Kaki pada Atlet Muda Lekaki)

NOR FATINAH AFFANDI, MOHAMAD SAUFI ZUHAN MAIL, NORAIN MOHD AZHAR & SHAZLIN SHAHARUDIN*

Exercise & Sports Science Programme, School of Health Sciences, Universiti Sains Malaysia, 16150 Kota Bharu Kelantan Darul Naim, Malaysia

Received: 6 November 2018/Accepted: 23 September 2019

ABSTRACT

This study was conducted to evaluate the relationships between core strength, dynamic balance and knee kinematics during single leg squat. Core strength helps to improve dynamic balance and muscle coordination between lower and upper extremities, as well as reduce injury risks and muscular strength imbalance. Dynamic balance is the ability to maintain a stable position during dynamic tasks and can be used as a predictor of injury risk factors. Thirty-two state-level male junior athletes with a normal range of dynamic knee valgus were recruited. The participants went through a series of tests that included Modified Plank Test, Star Excursion Balance Test (SEBT) and Single Leg Squat (SLS) test. Two-dimensional knee frontal plane projection angle (FPPA) during SLS was evaluated at a 60° knee flexion. There was a statistically significant correlation between distance reached in anteromedial direction and knee FPPA during SLS in the non-dominant leg (r = 0.374, p = 0.035). There was no significant correlation between duration of plank and knee FPPA during SLS in both dominant and non-dominant legs. The outcomes from this study are important to prevent lower limb injuries in male junior athletes.

Keywords: Biomechanics; dynamic knee valgus; top down kinetic chain; youth athletes

ABSTRAK

Kajian ini telah dijalankan untuk menilai hubungan antara kekuatan teras, keseimbangan dinamik serta kinematik lutut semasa mencangkung dengan sebelah kaki. Kekuatan teras membantu untuk memperbaiki keseimbangan dinamik dan koordinasi otot antara bahagian atas dan bawah anggota badan, di samping mengurangkan risiko kecederaan dan ketidakseimbangan kekuatan otot. Keseimbangan dinamik ialah kebolehan untuk mengekalkan posisi yang stabil semasa tugas dinamik dan boleh digunakan sebagai satu peramal faktor risiko kecederaan. Tiga puluh dua atlet junior lelaki peringkat negeri yang mempunyai lutut valgus dinamik dalam anggaran normal, telah direkrut. Peserta menjalani satu siri ujian yang merangkumi Ujian Plank Diubahsuai, Ujian Keseimbangan Pergerakan Bintang (SEBT) dan ujian Mencangkung Sebelah Kaki (SLS). Sudut unjuran lutut dua dimensi pada satah depan (FPPA) semasa SLS telah dinilai pada lutut bengkok bersudut 60°. Terdapat korelasi yang signifikan secara statistiknya antara jarak yang dicapai dalam arah anteromedial dan FPPA lutut semasa SLS pada kaki tidak dominan (r = 0.374, p = 0.035). Tiada korelasi yang signifikan antara tempoh plank dan FPPA lutut semasa SLS pada kedua-dua kaki dominan dan tidak dominan. Hasil daripada kajian ini adalah penting untuk mencegah kecederaan anggota bawah badan dalam kalangan atlet junior lelaki.

Kata kunci: Atlet muda; biomekanik; lutut valgus dinamik; rantaian kinetik atas bawah

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*Corresponding author; email: shazlin@usm.my