This study was to investigate the difference of muscle activities in trunk, upper arm, and shoulder during push-up exercise based on 3 types of different arm position(posterior position, PP; normal position, NP; and anterior position, AP) and to provide effective push-up arm position for each muscle development. Fifteen healthy males(age, 21.5±0.5 years; height, 172.7±1.0 cm; body mass, 70.5±1.3 kg; shoulder width, 42.3±0.6 cm; and BMI, 23.6±0.5 kg/m2) participated in this study. PP, NP, and AP of the arm were used to conduct push-up exercise and 8 muscles(deltoideus p. acromialis: DA; pectoralis minor: PMI; pectoralis major: PMA; serratus anterior: SA; biceps brachii: BB; triceps brachii: TB; latissimus dorsi: LD; and infraspinatus: IS) of right side were selected to measure muscle activities. Total 9 counts of push-up exercise were conducted and EMG data signals of 5-time(from 3th to 7th) push-up movement were used for measuring muscle activities. PP push-up exercise showed that there was a significantly higher muscle activity of DA, PMI, PMA, SA, BB, LD, and IS(p<.05) and AP push-up exercise showed a significantly higher TB activity(p<.05). It would be suggested that different arm position evokes various muscle activities when conducting push-up exercise. PP would be the best push-up arm position for inducing various trunk, upper arm, and shoulder muscle activities compared to NP and AP.

Abstract
 1. Introduction
 2. Materials and Method
  2.1. Participants
  2.2. Experimental approach to the problem
  2.3. Procedures
  2.4. Statistical Analysis
 3. Results
 4. Discussion
 5. Conclusion
 Acknowledgments
 References

• You-Sin Kim(Department of Leisure Sports, School of Sports Science, Jungwon University)
• Jae-Young Yang(Department of Physical Education, Graduate School, Jungwon University)
• Nam-Ju Lee(Department of Leisure Sports and Sports Health Medicine, School of Sports Science, Jungwon University) Corresponding author