Background: Improperly conducted exercise may lead to worsening of musculoskeletal complications. Such may worsen due to increased repetition and intensity during exercise. In addition, different responses may show different needs for training program.
Objectives: To compare kinematics of symmetric concentric and eccentric motions during increased repetitions and intensities for men and women.
Design: Quasi-randomized trial.
Methods: A total of ten men and eleven women participated in this study. Concentric and eccentric motions of the lateral raises were observed for initial positions of abduction and adduction. Low and high exercise intensities were applied, and 15 repetitions were conducted for both intensities. Initial, 3 inbetween repetitions, and last repetition were recorded for comparisons.
Results: The concentric or abduction motions showed no significant differences for all comparisons. However, eccentric or adduction motions showed greater significant differences as the exercise intensity increased for both men and women. Such significant differences were most prevalent during the first and last repetitions with greatest differences during the initial repetitions.
Conclusion: Kinematic difference between men and women during increased repetitions and intensity indicate the need for more individualized exercise intervention and consideration between men and women. Individualized interventions may prevent exercise-induced postural abnormality and corresponding musculoskeletal dysfunction.

INTRODUCTION
SUBJECTS AND METHODS
    Subjects
    Experimental procedure
    Questionnaires
    Lateral raises
    Motion assessment
    Statistical Analysis
RESULTS
DISCUSSION
CONCLUSION
REFERENCES

• Haemi Jee(Department of Physical Therapy, Namseoul University)