Comparison of cutaneous resonance running time between old and young people in a normal Chinese population.

Abstract

：Objective To study thecutaneous resonance running time(CRRT)in normal young and old Chinese people.Methods Atotal of 152 young subjects aged 20 - 40 years and 64 old subjects aged 60 - 88 years wereenrolled in this study.A reviscometer RVM600 was used to measure CRRT at variousdirections on the left dorsal hand, forearm, forehead and outer canthus.Results CRRTvaried with body sites and measuring directions.On the forearm, CRRT at all directionsexcept 2 - 8 o'clock were higher in old than in young subjects(0 - 6 o'clock direction, t= 7.46, P ＜ 0.01; 1 - 7 o'clockdirection, t = 3.38, P ＜ 0.01; 3 -9 o'clock direction,t = 3.88, P ＜ 0.05; 4 - 10 o'clockdirection, t = 6.82, P＜ 0.01; 5 - 11 o'clockdirection, t = 7.42, P ＜ 0.01).On the dorsal hand,CRRT at all directions were higher in young than in old subjects (0 - 6 o'clock direction,t = 4.53, P ＜ 0.01; 1 - 7 o'clockdirection, t = 5.71, P ＜ 0.01; 2 - 8 o'clockdirection, t = 2.74, P＜ 0.01; 4 - 10 o'clockdirection, t = 2.67, P＜ 0.01; 5 - 11 o'clockdirection, t = 4.20, P＜0.01).On the forehead, there was no significantdifference in CRRT between young and old subjects.And on the outer canthus, CRRT at 1 - 7and 2 - 8 o'clock directions were higher in young than in old subjects(1 -7 o'clockdirection, t = 3.18, P ＜ 0.01; 2 - 8 o'clockdirection, t = 5.11, P＜ 0.01).There was no statistical difference in CRRT between males andfemales.Conclusion CRRT varies with age, body sites, measuring directions, but not withgender in normal Chinese people. Key words: Cutaneous resonance running time; Age factors; Sex factors