不同LED照明参数对老年人心电生理响应的影响

光的非视觉生物效应与人体健康密切相关,随着LED在室内照明中的广泛应用,LED照明与人体生理健康的关系也日益重要.心电图(ECG,electrocardiograph)是生理参数的主要表征之一.针对LED照明,以3种色温(3000、5000、6500 K)、5种照度(300、500、750、1000、1500 lx)为主要变量,研究不同光照时长(10、20 min)下,老年人心电指标对光响应的情况.结果显示,照度、色温等光照参数的主效应对老年人的ECG无显著影响,但照度和色温的交互作用对老年人的ECG影响显著.其中,3000 K和10001x的交互作用对P波时间和T波时间影响最大;6500 K和15001x的交互作用影响最小;5000 K和7501x的交互作用对PR间期影响最大,6500 K和5001x的交互作用影响最小.但较短光照时长下,老年人的ECG变化不明显.因此,有必要探讨更长时间(1h及以上)光照下,老年人的心电生理响应情况,从而为老年人健康照明参数的确定提供依据.

The effects of different LED lighting parameters on ECG response of the elderly

The non-visual biological effect of light is closely related to human health. With the wide application of LED in indoor lighting, great attention has been paid to the relationship between LED lighting and human physiological health. Electrocardiograph (ECG) is one of the main characteristics of physiological parameters. Therefore, the response of ECG indicators of the elderly to LED lighting in different light exposure duration (10 min, 20 min) were investigated by taking three levels of color temperature (3000 K, 5000 K and 6500 K) and five levels of illuminance (300 lx, 500 lx, 750 lx, 1 000 lx and 1500 lx) as main variables. Experimental results indicate that ECG indicators of the elderly are not affected by main effects of color temperature and illuminance, but indeed affected by the interaction of illuminance and color temperature, wherein P wave time and T wave time are most affected by the interaction of 3 000 K and 1 000 1x, and least affected by the interaction of 6500 K and 1 500 1x; PR interval is most affected by the interaction of 5 000 K and 750 lx, and least affected by the interaction of 6 500 K and 500 1x. However, the changes of ECG of the elderly are not significantly influenced by the short light exposure duration, so it is necessary to further explore the response of ECG indicators of the elderly under long-term (1 h or more) exposure so as to provide sufficient basis for the determination of healthy lighting parameters for the aged.