The Effects Of Foreknowledge And Abdominal Breathing On HRV Of College Students Under Stress

The purpose of this study were to: (1) study the effects of foreknowledge on the heart rate variability (HRV) of college students under stress.(2)compare the effects of foreknowledge on the HRV under stress with the abdominal breathing's.(3)study the effects of foreknowledge on the HRV of difference genders under stress.(4)study the effects of foreknowledge on the HRV of introverts and extroverts under stress.Forty-eight college students were assigned into two experimental groups and one control group according to the same amount of genders and the same amount of introverts and extroverts.One section of a dracula movie named The Exorcist was used as stressor. One of the two experimental groups was abdominal breathing group in which subjects were trained to exercise abdominal breathing (their breath should reached the aim that lower than 8 times per minutes), while the other one was foreknowledge group in which the contents of the section were told to the subjects in detail. Foreknowledge group use 15 minutes imagine the contents of the section before see the film, abdominal breathing group does abdominal breathing while seeing the film,To analyze the HRV of the subjects, this study using short-term (5 minutes) frequency domain methods. The dependent variables are average HR, high-frequency (HF), low-frequency (LF) and LF/HF.Results:1.Foreknowledge group has smaller changes than control group in average HR, low-frequency (LF) and LF/HF(P .01).2.There has no significant difference between the effects of foreknowledge group and abdominal breathing group on the changing of the HRV(P .05).3.In foreknowledge group, males has significant smaller changes than females in LF(P .05).4.In foreknowledge group, extroverts has significant smaller changes than introverts in LF(P .05). That means: 1. Foreknowledge is an effective strategy of coping.2.There has no significant difference between the effects of foreknowledge and abdominal breathing while in the coping.3.There has sex difference in the conditions of foreknowledge, male has well coping.4.There has difference between extroverts and introverts in the conditions of foreknowledge, extroverts has well coping.