Online ISSN : 1884-6599
Print ISSN : 0037-2072
ISSN-L : 0037-2072
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  • Akio KUZUHARA, Yuri SHIGA, Kurumi TAKEUCHI, Yuki UTAGAWA, Minami UEKI, ...
    2020 Volume 61 Issue 5 Pages 373-380
    Published: May 25, 2020
    Released: May 25, 2020

    In order to develop the novel washing system using alkaline electrolytic water, we investigated the influence of washing temperature on detergency of electrolytic reduction ion water (ERW). The detergency was evaluated from the change in the surface reflectance of the original cotton fabric and the wet-type artificially soiled fabrics due to the washing. In the case of soak washing and main washing, the detergency of 5 times diluted ERW clearly increased with increasing temperature. Also, the detergency of 5 times diluted ERW was higher than that of a commercial liquid detergent (standard usage). This indicates that ERW has excellent washing functionality. In particular, the detergency of the soak washing using only 5 times diluted ERW (washing time: 15 min.) was the same level as that of the main washing (washing time: 10 min.) using a commercial liquid detergent at 40oC, suggesting that the soak washing using ERW is an effective means of preventing the damage to fabrics. In addition, it was clear that the washing temperature, the dilution ratio, and the mechanical action during rinsing process played the most important role in removing soil for the soak washing using ERW.

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  • Reina KATO, Riho SAKASHITA, Harumi MOROOKA, Shih-ping LIN, Pei-te SHEN
    2020 Volume 61 Issue 5 Pages 381-390
    Published: May 25, 2020
    Released: May 25, 2020

    In this study, the basic guidelines of pressure design for compression running tights (Cp-type tights) with excellent work efficiency were derived. Three kinds of compression tights and one kind of normal tights as a control were tested. These compression tights featured a combination of two different stretch portions: soft and hard. Six female subjects aged 22-27 years were engaged for the study. They were asked to run at a speed of 8 km/h on a treadmill for 35 min. The following parameters were measured through wearing experiments: clothing pressure, electromyogram, electrocardiogram, respiratory rate, and minute ventilation. EMG analysis was conducted using the integrated EMG (iEMG). The iEMG decreased with increasing clothing pressure in each part of the Cp-type tights except at the inner side of the lower leg. The mean power frequency increased as the iEMG decreased. From this, it was found that the clothing pressure of Cp-type tights efficiently supported posture-holding muscles and suppressed vibration in the thigh and lower leg muscles, thereby reducing muscle load and muscle fatigue. The heart rate, sympathetic nervous activity, and minute ventilation also tended to be low at high clothing pressure. However, it is necessary to design the clothing such that the pressure around the inside of the lower legs is not high enough to cause swelling due to muscle contraction.

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