Journal of the Korean Society of Physical Medicine 2025 KCI Impact Factor : 1.09
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pISSN : 1975-311X / eISSN : 2287-7215
- https://journal.kci.go.kr/kspm
KJCKorea
Journal Central
Effects of Three Sitting Posture Types during Smartphone Use on Muscle Activity and Respiratory Function in Young Adults
- Journal of the Korean Society of Physical Medicine
- Abbr : J Korean Soc Phys Med
- 2025, 20(1), pp.1~14
- DOI : 10.13066/kspm.2025.20.1.1
- Publisher : The Korean Society of Physical Medicine
- Research Area : Medicine and Pharmacy > Physical Therapy > Other physical therapy
- Received : October 31, 2024
- Accepted : January 4, 2025
- Published : February 28, 2025
Mikyoung Kim
1,
Beom-Cheol Jeong
2,
Kyungtae Yoo
3
1남서울대학교대학원 물리치료학과
2sg삼성조은병원
3남서울대학교
Accredited
ABSTRACT
PURPOSE: This study examined the muscle activity and respiratory function of young adults according to the types of sitting posture with crossed legs during smartphone use. METHODS: The subjects were 30 young adults. They performed three types of sitting with crossed-leg posture during smartphone use for 15 minutes: crossed-leg posture in the first week, tailored crossed-leg sitting posture in the second week, and upright sitting posture in the third week. The muscle activity and respiratory function were measured before and after the sitting postures. The muscle activity of six muscles was measured using surface electromyography: external oblique (EO), internal oblique, erector spinae (ES), rectus femoris, vastus lateralis, and tensor fascia latae. The respiratory function was measured using the forced vital capacity, forced expiratory volume in one second, and maximal voluntary ventilation (MVV).
RESULTS: The EO muscle activity in the crossed-leg sitting was significantly higher than in tailored crossed-leg sitting and upright sitting (p = .000). The ES muscle activity in tailored crossed-leg sitting increased significantly after the posture (p = .036). Regarding the respiratory function, the MVV in crossed-leg sitting was significantly lower than in the tailor crossed-leg sitting and upright sitting (p = .000). CONCLUSION: Crossed-leg sitting posture during smartphone use can have a negative effect on the vertebral muscle activity and respiratory function. Maintaining an upright sitting posture during smartphone use is important for body alignment and respiratory function.
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