着衣実験における安静時姿勢に関する実験方法の検討

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  • A Discussion of Experimental Methods Regarding Resting Position During Dressing Tests
  • チャクイ ジッケン ニオケル アンセイジ シセイ ニ カンスル ジッケン ホウホウ ノ ケントウ

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The present study was designed to investigate an optimum resting position during dressing tests using power spectral analysis of heart rate variability (HRV). Two experimental conditions were established. (i) a “supine position” group (healthy women, 20.0±1.6 yrs. n=15): the subjects rested quietly in a supine position, and then stood up and put on trousers, after which they rested for a further five minutes in a supine position. (ii) a “standing position” group (healthy women, 21.1±1.30 yrs. n=11): the subjects rested quietly in a standing position, and then put on trousers, after which they rested for a further five minutes in the same standing position. The condition of the trousers was the same for both groups. The autonomic nervous system (ANS) activity of the two groups was compared by measuring HRV. The results were as follows:1)“Standing position” group: one minute and two minutes after putting the trousers on, the HF/TP value was significantly increased compared with the period before the trousers were put on, whereas the LF/HF ratio decreased remarkably. At that time, the parasympathetic nervous system was dominant, and HR was significantly decreased. ANS activity recovered three minutes after putting on the trousers. On the other hand, in the supine position group, the HF/TP value recovered one minute after putting on the trousers, and it was therefore not possible to analyze the influence of dressing. 2) In dressing tests, the movement from a supine to a standing position affected HRV after putting on the trousers. Therefore, the standing position, which entailed no posture conversion was found to be a suitable resting position during dressing tests.

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