Abstract:

Objective To study the cutaneous resonance running time（CRRT） in normal young and old Chinese people. Methods A total of 152 young subjects aged 20 - 40 years and 64 old subjects aged 60 - 88 years were enrolled in this study. A reviscometer RVM600 was used to measure CRRT at various directions on the left dorsal hand, forearm, forehead and outer canthus. Results CRRT varied with body sites and measuring directions. On the forearm, CRRT at all directions except 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′clock direction, t = 3.38, P < 0.01; 3 - 9 o′clock direction, t = 3.88, P < 0.05; 4 - 10 o′clock direction, t = 6.82, P < 0.01; 5 - 11 o′clock direction, 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′clock direction, t = 5.71, P < 0.01; 2 - 8 o′clock direction, t = 2.74, P < 0.01; 4 - 10 o′clock direction, t = 2.67, P < 0.01; 5 - 11 o′clock direction, t = 4.20, P < 0.01）. On the forehead, there was no significant difference in CRRT between young and old subjects. And on the outer canthus, CRRT at 1 - 7 and 2 - 8 o′clock directions were higher in young than in old subjects （1 - 7 o′clock direction, t = 3.18, P < 0.01; 2 - 8 o′clock direction, t = 5.11, P < 0.01）. There was no statistical difference in CRRT between males and females. Conclusion CRRT varies with age, body sites, measuring directions, but not with gender in normal Chinese people.

Key words: age, gender, skin, cutaneous resonance running time