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http://dx.doi.org/10.5805/SFTI.2017.19.4.504

Evaluation of Muscle Fatigue and Subjective Fatigue depending on the Hip Seat and Waist Support Band of Baby Carrier  

Lee, Heeran (Research Institute of Human Ecology, Chungnam National University)
Hong, Kyung Hwa (Dept. of Fashion Design and Merchandising, Kongju National University)
Publication Information
Fashion & Textile Research Journal / v.19, no.4, 2017 , pp. 504-514 More about this Journal
Abstract
Discomfort as well as muscular pain and musculoskeletal diseases occur in cases of stressed posture due to prolonged pressure. Therefore, the American Academy of Orthopaedic Surgeons (AAOS) and Pediatric Orthopaedic Society of North America (POSNA) recommend that bags that weigh no more than 15 - 20% of the wearer's weight. However, despite the prolonged pressure from using baby carriers, there are no recommendations and limited studies on how to protect wearers. Therefore, this study investigates subjective fatigue according to the usage of waist support and hip seat. Based on this, muscle fatigue and secondary subjective fatigue according to three types of currently commercial baby carriers (X-type, H-type, and H-hip type) were measured. Subjective comfortability was evaluated on a 5 point Likert-scale and subjective fatigue was evaluated on Borg's CR-10 scale. Objective muscle fatigue was also compared by measuring and analyzing electromyogram (EMG). The results of primary subjective fatigue showed statistically significant changes in the shoulders, waist, calves, and soles of the feet according to the usage of hip seats and waist support. Electromyogram measurements also showed less muscle fatigue at the upper trapezius muscle and thoracic erector spine muscle for the H-hip seat baby carrier, which has both waist support and hip seat, compared to an X-type baby carrier, which has neither. However, results of subjective fatigue showed opposite results at the waist despite having same results at the shoulders and beneath the shoulders. This show discrepancies between objective muscle fatigue and subjective fatigue; therefore, that both aspects must be taken into consideration when developing ergonomic baby carriers.
Keywords
baby carrier; muscle fatigue; subjective fatigue; hip seat; waist support band;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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