The effects of knee flexion on muscle activation and performance during chin-up exercise

Keywords: chin-up, knee, muscle activation, strength, conditioning, performance

Abstract

Background and Study Aim. Chin-up is an exercise that is done to improve the strength, muscular endurance and size of the upper back and arm muscles. There are many ways to perform chin-up exercises including by performing it with different forms of knee flexion. This study aims to examine the effects of knee flexion on muscle activation and performance during chin-up exercise. Material and Methods. A total of twenty-one healthy trained male (age 20-25 years old) were recruited and were instructed to perform chin-up exercises in three knee conditions: i) knee fully flexed, ii) partial knee flexed, and iii) straight knee. Chin-up performance was measured by the number of repetitions performed in three sets. Muscle activation was measured using EMG and taken from latissimus dorsi (LD), posterior deltoid (PD), and biceps brachii (BB) during both concentric and eccentric phase. One-way repeated measure Analysis of Variances (ANOVA) were conducted to compare the muscle activation and number of repetitions performed across the three variation of chin-up exercise. Results. Findings showed that during the concentric phase, BB recorded higher muscle activation during straight knee compared to knee fully flexed and partial knee flexed, p < .05. In addition, chin-up performance during straight knee and partial knee flexed were better than knee fully flexed, p < .05. Conclusions. The results of this study demonstrated the importance to consider techniques manipulation during exercises due to its effects on acute responses as shown by number of repetitions and muscle activation in this study that might also affect the long-term outcomes.

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Author Biographies

Abdul Muiz Nor Azmi, Sultan Idris Education University
imanmuiz94@gmail.com; Faculty of Sports Science and Coaching, Sultan Idris Education University;  Tanjong Malim, Malaysia.
Mohd Syamil Shafiee, Ministry of Education, Malaysia
msyamil123@gmail.com;  Ministry of Education;  Putrajaya, Malaysia.
Nor Fazila Abd Malek, Sultan Idris Education University
fazipanthera@gmail.com;  Faculty of Sports Science and Coaching, Sultan Idris Education University;  Tanjong Malim, Malaysia.
Kevin Tan, Management and Science University
kevin13@live.com.my;  Faculty of Health and Life Sciences, Management and Science University;  Shah Alam, Malaysia.
Rajkumar Krishnan Vasanthi, INTI International University
rajkumarhari@yahoo.co.in;  Faculty of Health and Life Sciences, INTI International University;  Nilai, Malaysia.
Zulezwan Ab Malik, Sultan Idris Education University
zulezwan@fsskj.upsi.edu.my;  Faculty of Sports Science and Coaching, Sultan Idris Education University;  Tanjong Malim, Malaysia.
Ali Md Nadzalan, Sultan Idris Education University
ali.nadzalan@fsskj.upsi.edu.my;  Faculty of Sports Science and Coaching, Sultan Idris Education University;  Tanjong Malim, Malaysia

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Published
2022-06-30
How to Cite
1.
Azmi AMN, Shafiee MS, Malek NFA, Tan K, Vasanthi RK, Malik ZA, Nadzalan AM. The effects of knee flexion on muscle activation and performance during chin-up exercise. Pedagogy of Physical Culture and Sports. 2022;26(3):158-64. https://doi.org/10.15561/26649837.2022.0303
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Articles