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Changes in the Ratio of Medial to Lateral Gastrocnemius Muscle Activities According to Mediolateral Ramp Angles during Cross Ramp Walking

경사로 횡단 보행 시 경사로 각도에 따른 안·바깥쪽 장딴지근의 활성 비율 변화

  • Lee, Sang-Yeol (Department of Physical Therapy, College of Science, Kyungsung University) ;
  • Ahn, Soo-Hong (Department of Biomedical Health Science, Dongeui University) ;
  • Kim, Young-Hoon (Department of Physical Therapy, Masan University)
  • 이상열 (경성대학교 물리치료학과) ;
  • 안수홍 (동의대학교 보건의과학대학원) ;
  • 김용훈 (마산대학교 물리치료학과)
  • Received : 2017.05.29
  • Accepted : 2017.08.31
  • Published : 2017.12.31

Abstract

Purpose: This study was conducted to predict the risks that arise while standing on mediolateral ramps at various ramp angles by identifying the ratio of medial to lateral gastrocnemius muscle activities. Methods: The subjects were 20 healthy adult men. Seven mediolateral ramp angles ($0^{\circ}$, $2^{\circ}$, $5^{\circ}$, $10^{\circ}$, $15^{\circ}$, $20^{\circ}$, and $25^{\circ}$) were applied for the experiment. The ratio of medial to lateral gastrocnemius muscle activities in each condition was measured using electromyography, and the measured data were converted to root mean square values to calculate the activity ratios. Results: The study results showed statistically significant differences in the ratio of mediolateral gastrocnemius muscle activities according to the selected mediolateral ramp angles. The results of a post hoc test confirmed that the multifidus muscles were asymmetrically used on the two sides at mediolateral ramp angles of $5^{\circ}$ or higher. Conclusion: This study found that an asymmetric use of the multifidus muscles began at a mediolateral ramp angle of $5^{\circ}$, and the provision of propulsion using the ankle joints on mediolateral ramps at $5^{\circ}$ or steeper was maneuvered differently from that on flat ground. This suggests that individuals with balance control disorder have the risk of falling due to ankle sprains and unstable balance control. Therefore, patients and elderly people are required to exercise caution when crossing $5^{\circ}$ or steeper ramps.

Keywords

References

  1. Blitz NM, Eliot DJ. Anatomical aspects of the gastrocnemius aponeurosis and its insertion: a cadaveric study. Journal of Foot and Ankle Surgery. 2007;46(2):101-108. https://doi.org/10.1053/j.jfas.2006.11.003
  2. Eckert HM. Motor development. Indianapolis. Benchmark Press. 1987.
  3. Giordano SB, Segal RL, Abelew TA. Differences in end-point force trajectories elicited by electrical stimulation of individual human calf muscles. Journal of Applied Biomechanics. 2009;25(4):330-339. https://doi.org/10.1123/jab.25.4.330
  4. Horak FB, Nashner LM. Central programming of postural movements: adaptation to altered support-surface configurations. Journal of Neurophysiology. 1986;55(6):1369-1381. https://doi.org/10.1152/jn.1986.55.6.1369
  5. Kim SC, Lee SY. Gluteus medius muscle activities according to various angle of mediolateral ramp during cross walking and one-leg standing. Journal of the Korean Society of Physical Medicine. 2017;12(2):53-57. https://doi.org/10.13066/kspm.2017.12.2.53
  6. Lee SY, Lee SM, Jung JM. Peroneus longus activity according to various angles of a ramp during cross-ramp walking and one-legged standing. Journal of Back and Musculoskeletal Rehabilitation. 2017;30(4):publish ahead.
  7. Okada S, Hirakawa K, Takada Y, et al. Age-related differences in postural control in humans in response to a sudden deceleration generated by postural disturbance. European Journal of Applied Physiology. 2001; 85(1-2):10-18. https://doi.org/10.1007/s004210100423
  8. Perry J. Gait analysis: normal and pathological function. New Jersey. SLACK. 1992.
  9. Simoneau E, Martin A, Van Hoecke J. Effects of joint angle and age on ankle dorsi- and plantar-flexor strength. Journal of Electromyography and Kinesiology. 2007;17(3):307-316. https://doi.org/10.1016/j.jelekin.2006.04.005
  10. Vieira TM, Minetto MA, Hodson-Tole EF, et al. How much does the human medial gastrocnemius muscle contribute to ankle torques outside the sagittal plane? Human Movement Science. 2013;32(4):753-767. https://doi.org/10.1016/j.humov.2013.03.003