Heart rate variability during sympatho-excitatory challenges: Comparison between spontaneous and metronomic breathing

Respiration influences heart rate variability, leading to the suggestion that respiration should be controlled to assess autonomic function by using heart rate variability. Clearly, control of respiration is advantageous or even essential in several experimental circumstances. However, control of respiration, by itself, produces a small, but significant, increase in mean heart rate and a decrease in respiratory synchronous variation in heart rate. We tested whether, in some experimental situations, it may be possible to arrive at similar interpretation about autonomic function with and without using control of respiratory rate. heart rate spectral powers from nine subjects were compared between spontaneous and metronomic breathing during two sympatho-excitatory stresses, lower body negative pressure (LBNP) and head up tilt (HUT). The normalized spectral powers in supine and HUT during spontaneous breathing were: 0.43 and 0.75 in very low (VLF) and 0.28 and 0.09 in high frequency (HF) regions. The powers during metronomic breathing were: 0.36 and 0.82 (VLF) and 0.36 and 0.09 (HF). The powers in supine and LBNP during spontaneous breathing were: 0.43 and 0.81 (VLF) and 0.28 and 0.06 (HF). The powers during metronomic breathing were: 0.36 and 0.80 (VLF) and 0.36 and 0.07 (HF). All p values were <0.05. Therefore, changes in heart rate spectral powers during HUT and LBNP were similar during metronomic breathing and spontaneous breathing. These results suggest that in experimental designs such as in our study, using metronomic breathing may not provide any additional insight into autonomic function than that can be obtained during spontaneous breathing.     

放松训练和腹式呼吸对应激的影响

探讨腹式呼吸和放松训练对应激引起的T波幅度降低和心率升高的对抗作用。被试为 3组 38名女大学生。结果表明 :(1)放松训练和腹式呼吸均能显著促进T波幅度升高和对抗应激时T波幅度的降低 ,但腹式呼吸的效果优于放松训练。 (2 )应激会引起心率的显著上升和T波幅度的显著降低。 (3)心率不是测量放松训练和腹式呼吸效果的敏感指标。结论 :腹式呼吸和放松训练可以有效地缓解心血管系统的应激反应     

ANALYSIS OF A SIMPLIFIED TREATMENT FOR STUTTERING IN CHILDREN

We investigated the effectiveness of a simplified program for the treatment of stuttering in children. The simplified treatment included awareness training, in which the subjects learned to detect every occurrence of stuttering; training a response incompatible with stuttering, which involved relaxation and regulation of air flow over the larynx when speaking; and social support, which involved parent-delivered prompts and praise of children's use of the techniques in everyday environments. Eight children were treated in their homes with the simplified treatment, in a multiple baseline across subjects design, and all reached the criterion level of less than 3% words stuttered. In addition, the reduction in stuttering generalized to the school setting and was maintained at posttreatment (10 to 13 months). The subjects' rates of speech remained stable throughout baseline and treatment. Pretreatment and posttreatment ratings by the parents showed that they found treatment to be both acceptable and credible. Finally, social validity measures revealed a noticeable improvement in the subjects' speech to parents and speech pathologists.     

睡眠对儿童执行功能的影响

近期研究表明, 睡眠总量和睡眠质量都会对儿童执行功能的发展造成影响, 在自然睡眠条件下, 睡眠质量的影响倾向于即时性, 睡眠总量的影响具有滞后性, 在实验干预条件下, 少量的睡眠延长提高了儿童的执行功能表现。睡眠问题中研究最为广泛的睡眠呼吸障碍也会对儿童的执行功能带来危害, 但由于方法的不同, 目前的研究在结论上并不一致。随着年龄的增长, 睡眠对儿童执行功能的影响会逐步降低。此外, 基因、家庭社会经济地位等内外部因素也会对研究结果产生影响。未来的研究应针对执行功能中认知灵活性这一成分进行加强。     

The Learning of Programmed- and Feedback-Based Processes Controlling the Production of a Positioning Response in Two Dimensions

Two experiments were conducted to investigate the learning of the programmed- and feedback-based processes controlling the production of a slow, self-paced positioning response in two dimensions (direction and extent) in the horizontal plane. Both experiments had two phases: an acquisition phase of 60 trials with KR, followed by a KR withdrawal phase of 20 trials. In Experiment 1, one group (N=15) had visual feedback about the ongoing movement and the other group (N=15) did not. In Experiment 2, one group (N=15) practiced initiating the response in the criterion direction and moving the criterion extent, whereas, the other group (N=15) practiced initiating the response in the criterion direction and moving randomly varied extents. The results of Experiment 1 indicated that the learning of a programmed-based process is a gradually acquired freedom from visual feedback. Experiment 2 revealed that a programmed-based process can be learned independent of a feedback-based process.     

High Thrill and Adventure Seeking Is Associated with Reduced Interoceptive Sensitivity: Evidence for an Altered Sex‐specific Homeostatic Processing in High‐sensation Seekers

The personality trait of sensation seeking (SS) has been traditionally linked to the construct of exteroception, that is, sensing of the outside world. Little is known about the relationship between SS and interoception, that is, sensing originating in the body. Interoceptive sensations have strong affective and motivational components that may influence behaviours such as risk taking in SS. This investigation examined whether interoceptive differences contribute to different behavioural characteristics in SS. Using an inspiratory resistive load breathing task, the response to an aversive interoceptive stimulus as a basic homeostatic process was studied in 112 subjects (n = 74 women and 38 men). A linear mixed‐model approach was used to examine the influence of thrill and adventure seeking (TAS) on the interoceptive response across three levels of breathing resistances (10, 20, and 40 cm H₂O/L/second). High‐TAS relative to low‐TAS individuals were less responsive in evaluating intensities of perceived choking with increasing inspiratory resistive loads. This effect was driven by male, but not female, high‐TAS individuals and was particularly associated with reduced interoceptive sensitivity in men. The conceptualization of SS as primarily driven by exteroceptive stimuli can be expanded to a view of an altered homeostasis in SS, specifically in men. Copyright © 2013 European Association of Personality Psychology