| Keywords |
Silver nanoparticles ; Treadmill exercise ; Energy expenditure ; Garment |
| Abstract |
This study evaluated the physiological effects of wearing silver nanoparticle treated garments, Aluminumsilicate, Illite, Silver nano (Nano AIS), on energy expenditure (EE) and sweat loss in middle aged women. Ten healthy women were recruited and randomly divided into two groups either Nano AIS clothes wearing group (SnG; n=5, 42.9±3.7 yrs, 159.6±4.6 cm, 58.6±7.4 kg, 23.0±2.9 kg·m?2) or control group (CG; n=5, 43.7±3.1 yrs, 159.4±3.3 cm, 61.6±9.7 kg, 23.8±3.3 kg·m?2). They underwent two experiment sessions at an ambient air (22-24oC). In both sessions, they walked or ran on a treadmill for 30 min at 55-65% of their maximal capacity (approximately 6-6.5 km·hr?1). Subjects in CG wore regular cotton fabric clothes in both session. Subjects in SnG wore cotton clothes at first session, but did Nano AIS during second session. Metabolic responses and heart rate (HR) were monitored and recorded during the sessions. No differences were found during exercise in HR, respiratory exchange ratio between SnG and CG. On the other hand, EE elevated by 16.2 kcal from 175.4 kcal in first session to 191.6 kcal in second session in SnG, and it was equivalent to 9.24% increment (10.13% increment neutralized by lean body mass; p<0.05). EE in CG was not different between two sessions. Outer ear temperature, body heat, and sweat loss were not different between groups and sessions. The metabolic effect of wearing Nano AIS was evident compared to wearing a conventional cotton fabric clothes and it elevated EE during exercise on a treadmill. |