Effects of Visual Manipulation in Sit-to-Stand Movement in Children With Cerebral Palsy

The authors sought to verify the effects of vision on sit-to-stand (STS) movement performance by means of postural sway in children with cerebral palsy (CP) and typical children (TC). Participants were 42 TC and 21 children with CP. STS movement was assessed with eyes open and with eyes closed. Area and velocity of center of pressure sway were analyzed in each of the 3 STS phases. We observed greater postural sway during STS movement with eyes closed. Children with CP presented greater postural sway than TC did. Both groups exhibited greater postural instability with absence of vision expressing the role of vision to keep postural stability. Moreover, the greater postural instability was observed in children with CP.     

Hands Support and Postural Oscillation During Sit-to-Stand Movement in Children With Cerebral Palsy and Typical Children

The authors aimed to compare the weight bearing on hands during sit-to-stand (STS) movement in children with cerebral palsy (CP) and typical children (TC), verify its effect on postural oscillation, and analyze the relationship between weight bearing on hands and postural oscillation. Twenty children with CP (Gross Motor Function Classification System levels I and II) and 35 TC performed STS with and without anterior hands support. Mann-Whitney test compared weight bearing between groups. Wilcoxon test investigated differences in postural oscillation between the conditions with and without anterior hand support for both groups. The Spearman correlation tested the relationship between weight-bearing and postural oscillation during the hand support condition. Children with CP bore more weight on hands than TC to perform STS. The hand support reduced postural oscillation during the second phase of STS in both groups. In the CP group, greater weight bearing was related with lower postural oscillation in the beginning of STS. Although children with CP were able to perform STS without support, they bore more weight on their hands to perform the task than TC. Moreover, children with CP and TC use mechanical and somatosensory information to modulate their postural control during STS in different ways.     

心理干预对轻中度脑瘫儿童综合功能和生活质量的影响*

采用对照组和干预组前测、后测设计,对80名脑瘫儿童的综合功能和生活质量进行了测量,分析了心理干预对脑瘫儿童康复疗效的影响。结果表明:(1)四组脑瘫儿童后测综合功能评定效果存在显著差异。(2)生活质量问卷中,在使用特殊器具感觉维度上,四个组别间的追踪水平逐级显著递增;在对疼痛和困扰感觉维度上,四个组别间的后测水平、追踪水平均逐级显著递减;在其它四个维度上,四个组别间的后测水平、追踪水平均逐级显著递增。(3)在使用特殊器具感觉维度上,三个干预组内的追踪水平显著高于前测和后测水平;在对疼痛和困扰感觉维度上,三个干预组内的前测、后测和追踪水平均呈逐级显著递减趋势;在其它四个维度上,三个干预组内的前测、后测和追踪水平均逐级显著递增。干预组比对照组能显著提升脑瘫患儿的综合功能和生活质量。     

The Impact of Deep Muscle Training on the Quality of Posture and Breathing

Postural control and breathing are mechanically and neuromuscularly interdependent. Both systems– of spinal stability and respiration– involve the diaphragm, transversus abdominis, intercostal muscles, internal oblique muscles and pelvic floor muscles. The aim of the study was to evaluate the effect of exercises activating deep stabilizer muscles on postural control and quality of breathing movements. Eighteen volunteers (25,7 ± 3,5) were recruited from the general population. All the subjects implemented an exercise program activating deep muscles. Head, pelvic and trunk positions in the sagittal and frontal planes were assessed with the photogrammetric method. Breathing movements were estimated with the respiratory inductive plethysmography. The results indicate that the use of deep muscle training contributed to a significant change in the position of the body in the sagittal plane (p = 0.008) and the increase in the amplitude of breathing (p = 0.001).     

Effects of Electromyostimulation on Knee Extensors and Flexors Strength and Steadiness in Older Adults

It is known that electromyostimulation (EMS) alone or superimposed over voluntary contraction (EV) can effectively improve muscle strength. However, the effect of this type of training on the ability to control force production at submaximal levels is unknown. The authors examined the effects of EV training on steadiness in force production of knee extensors and flexors in older adults. Forty participants, including 20 men and 20 women, 60–77 years of age, were randomly allocated into a control group (CG) and an electromyostimulation superimposed over voluntary contraction (EVG) group. The EVG performed 30 bilateral isometric knee extension and flexion contractions per session, 3 training sessions per week, for 6 weeks. The variations in force production, expressed in absolute (standard deviation [SD]) and relative (coefficient of variation [CV]) terms, were assessed in isometric contractions at 5%, 15% and 25% maximal voluntary contraction (MVC) levels. Results indicated that MVC increased in knee extension and flexion in EVG (p < .05) after the training; steadiness CV also improved at 15% MVC in knee flexion (p < .05) but no significant changes were found in knee extension and steadiness SD. The training-induced changes in MVC were not correlated to steadiness CV that might indicate different mechanisms underlying these adaptations.     

Effects of Training Volume on Hormones and Mood in Basketball Players

Mood and basal hormone levels were measured before and after a 4-month training period in 20 professional basketball players on 2 different teams. Training volume was daily quantified by intensities, showing that Team 1 trained nearly twofold the volume of Team 2. Apart from the lack of differences between teams in anthropometric and physical variables, results showed mood improvements in the total sample without differences between teams. However, cortisol levels decreased in Team 1 and increased in Team 2, while the free testosterone–cortisol ratio, free testosterone, prolactin, and luteinizing hormone did not show significant changes. Changes in cortisol were positively related to depression and negatively related to training volume. Results suggest that differences exist in sensitivity and/or timing of both psychological and hormonal responses to 2 given volumes of training.     

Effect of Short-Term Training on Reaching Behavior in Infants: A Randomized Controlled Clinical Trial

The purpose of this study was to test the effect of short-term training on reaching behavior in infants at the onset of reaching. The study was a single-blind, parallel group design, randomized controlled clinical trial. Thirty healthy infants were randomly assigned to a social control group (n = 15) or a reaching training group (n = 15). Infants began the study up to 3 days after the onset of reaching and were assessed three times across 2 days: pretraining (before training), posttraining 1 (after 1 session of training), and posttraining 2 (after 3 sessions of training). The reaching training group received 3 sessions of training by a physical therapist while the control group received a similar amount of time sitting in the therapist's lap. The data were analyzed using repeated-measures analyses of variance, and independent-samples tests with Bonferroni adjustments. Short-term training resulted in increased frequency of object contacts, shorter and smoother reaches, and improved hand positioning. The few short training sessions likely provided opportunities for infants to explore and learn to select movements from their existing movement repertoire. These results demonstrate that adaptive changes in infants' novel behaviors can emerge rapidly, and highlight the need for increased understanding of how to most effectively time early interventions.     

线索相对强度对再认场合效应的影响

本研究通过变化计算机屏幕呈现的物理特性(前景和背景颜色)控制场合因素,操纵词对的呈现次数(实验一)及双字词的加工水平(实验二)控制项目强度,考察了线索相对强度与再认场合效应的关系。结果发现：(1)项目呈现次数对再认场合效应无显著影响;(2)项目加工水平对再认场合效应有显著影响,深加工项目的激活对场合效应发生了掩蔽。最后,在回顾实验设计的基础上,对上述结果的成因及潜在变量的影响进行了简要探讨。     

视频游戏训练对执行功能的迁移效应

视频游戏训练是一种正处于探索阶段的执行功能训练方案,其对工作记忆和认知灵活性能产生迁移效应,对抑制的迁移结论尚不明确,这一结果不同无法通过考察迁移发生的泛化还是具体化机制得到解决,差异更有可能来自游戏训练本身。虽然真实游戏经验能产生迁移,但训练不一定能模拟经验对执行功能的迁移。这一方面受训练游戏类型的影响,另一方面与训练剂量有关。建议从丰富迁移机制等角度提高迁移效应。     

The Effects of Assertive Training on Sex Role Concept in Female Agoraphobics

Agoraphobia in women has often been associated with a restricted, "overly-feminine" sex role definition. We investigated whether assertiveness training from a female therapist would benefit agoraphobic women not only by teaching skills but incidentally by modeling a broader feminine gender role. Of 14 clients from an agoraphobic treatment program seven received assertiveness training as an adjunct to regular therapy. Sex role definition and assertiveness attitudes were measured with the Personal Attributes Questionnaire (Spence, Helmreich, & Stapp, 1974) and the Rathus Assertiveness Schedule (Rathus, 1973), administered before and following a 7-week treatment period. All the agoraphobics initially had significantly lower Masculinity scores on the PAQ than did large normative samples. T-tests performed on the data indicated that the assertiveness group's Masculinity scores increased after treatment to the level of the normative samples, while the comparison group did not change. Results supported the clinical observation that many agoraphobic women have limited gender role definitions, and indicated that this limitation consists of a deficit of masculine traits rather than a surplus of feminine ones.     

Effect of Transcranial Direct Current Stimulation Combined With Virtual Reality Training on Balance in Children With Cerebral Palsy: A Randomized,Controlled, Double-Blind,Clinical Trial

The authors' aim was to investigate the effects of continuous transcranial direct current stimulation (tDCS) combined with virtual reality training on static and functional balance in children with cerebral palsy (CP). Twenty children with CP (6 girls and 14 boys; M age = 7 years 6 months ± 2 years) were randomly allocated to two groups. The experimental group received active tDCS and the control group received sham stimulation during the 10 sessions of virtual reality mobility training protocols. The children were evaluated on 3 occasions (preintervention, postintervention, and 1-month follow-up). Static balance was evaluated using a force plate under 4 conditions: feet on force plate with (a) eyes open and (b) with eyes closed, and feet on foam mat with (c) eyes open and (d) with eyes closed. Functional balance was evaluated using the Pediatric Balance Scale and the Timed Up and Go Test. The analyses demonstrated statistically significant postintervention and follow-up effects favoring the experimental group over the control group with regard to the Pediatric Balance Scale, Timed Up and Go Test, and area of oscillation of the center of pressure when standing on the force plate with eyes open. The present findings suggest that tDCS can potentiate the effects of virtual reality training on static and functional balance among children with CP.     

Training Appraisees to Participate in Appraisal: Effects on Appraisers and Appraisees

This study examined the role of behavior modeling training (BMT) in enhancing appraisee participation during a performance appraisal discussion. In addition, the study examined the effects of enhanced participation on appraisee and appraiser perceptions toward several appraisal outcome variables; in particular, the fairness and accuracy of performance appraisal were of interest. The experimental design was a 2 × 3 completely crossed factorial design consisting of two levels of training (behavior modeling vs. lecture/discussion) and three levels of bogus evaluation feedback (low, neutral, and high). A series of multivariate and univariate comparisons were used to test the hypothesized outcomes. The findings suggest that appraisers exposed to the BMT group perceived appraisees as more proactive and better performers and, in addition, reported liking the appraisees more, and perceiving the appraisal process as more fair. The study also found support for the egocentric bias in perceived outcome fairness: appraisees in both training conditions who received a high evaluation perceived the appraisal evaluation as more fair than appraisees who received a low evaluation. In addition, the study found that favorable evaluations were also perceived as being more accurate. The results of the study are discussed in terms of procedural justice theory and related research examining the role of performance feedback on both the appraisee and the appraiser. Suggestions for future research in the areas of behavior modeling, voice-giving (high-input) procedures, and procedural justice are discussed.     

Submovement Organization,Pen Pressure,and Muscle Activity Are Modulated to Precision Demands in 2D Tracking

The authors investigated how tracking performance, submovement organization, pen pressure and muscle activity in forearm and shoulder muscles were affected by target size in a 2D tracking task performed with a pen on a digitizer tablet. Twenty-six subjects took part in an experiment, in which either a small dot or a large dot was tracked, while it moved quasirandomly across a computer screen at a constant velocity of 2 cm/s. The manipulation of precision level was successful, because mean distance to target and the standard deviation of this distance were significantly smaller with the small target than with the large target. With a small target, subjects trailed more behind the center of target and used submovements with larger amplitudes and of shorter duration, resulting in higher tracking accuracy. This change in submovement organization was accompanied by higher pen pressure, while at the same time muscle activity in the forearm extensors and flexors was increased, indicating higher endpoint stability. In conclusion, increased precision demands were accommodated by both a different organization of submovements and higher endpoint stability in a 2D tracking task performed with a pen on a digitizer tablet.     

Behavioural and ERP Effects of Cognitive and Combined Cognitive and Physical Training on Working Memory and Executive Function in Healthy Older Adults

Cognitive and physical training have been shown to be effective in improving older adults’ cognition. However, it is not yet clear whether combined cognitive and physical training offers an advantage compared to cognitive training alone. Twenty-two older adults performed cognitive or combined cognitive and physical training in order to compare their effects on working memory event-related potentials (ERPs) and on working memory and executive function performance. Before and after eight weeks of training, performance in Plus Minus, Flanker, Updated Span, and Complex Span tasks was measured, and ERPs were registered during performance of an n-back task (0-back, 2-back, and 3-back). Post-training behavioural improvement was observed in Updated Span, Complex Span, and n-back tasks. During the n-back task, the N2/P3 complex was modulated by training, with a decrease in N2 amplitude and an increase in P3 amplitude in the posttraining session compared to the pretraining session. These changes in ERP components suggest that both types of training potentially reduce the need for attentional control to perform the tasks correctly and increase working memory capacity. Thus, based on our data, no conclusion can be reached on the direct advantage of combined training, either at behavioural or at neural level. However, the present study might suggest an indirect advantage of such a combined training, because the cognitive benefit was found to be highly similar in both types of training. Using combined cognitive and physical training may produce a potential improvement in general fitness and an increased appeal of training.     

Exercise type relates to inhibitory and error processing functions in older adults

ABSTRACT

This study investigated the association between exercise type and inhibition of prepotent responses and error detection. Totally, 75 adults (M = 68.88 years) were classified into one of three exercise groups: those who were regular participants in open- or closed-skill forms of exercise, and those who exercised only irregularly. The participants completed a Stroop and task-switching tasks with event-related brain potentials (ERPs) recorded. The results revealed that regular exercisers displayed faster reaction times (RTs) in the Stroop task compared with irregular exercisers. The open-skill exercisers exhibited smaller N200 and larger P300a amplitudes in the Stroop task compared with irregular exercisers. Furthermore, the open-skill exercisers showed a tendency of shorter error-related negativity latencies at the task-witching test. The findings suggest that older adults may gain extra cognitive benefits in areas such as inhibition functioning and error processing from participating in open-skill forms of physical exercises.     

谈《外科学》股骨干骨折肌肉牵拉移位表述存疑

股骨干骨折的两骨折端均受肌肉的牵拉,各不同部位可发生典型移位。我国本科教材《外科学》对其文字表述有9处存疑,即3处移位虚构不实、3处移位达意不清、3处移位被疏忽遗漏。流传达49年的示范插图有11处存疑,在肌肉动力、骨折定位、解剖方位、解剖形态、纵轴线等5个方面,欠缺认识而重复错绘。就文图20处存疑全方位坦诚探讨,必须重视基础理论,深入临床一线认真核查,弄清楚移位是怎样造成的,从而防范闭门造车及纸上谈兵,坚守真实底线,还原移位真相。

     

时间结构和速度线索对碰撞时间估计的影响

估计被遮挡的运动物体何时到达某一特定位置被称为碰撞时间估计,本研究利用遮挡范式,通过控制时间结构、物理速度及运动过程是否可见设计两个2（物理速度）×3（时间结构）实验来探究三者对碰撞时间估计的影响。结果：当时间结构一致时,不论物理速度快慢及是否存在视觉速度线索,被试的绩效都没有显著差异;当时间结构不一致时,不论物理速度快慢,存在视觉速度条件下被试的绝对偏差小于无视觉速度条件。结论：时间结构一致时,被试主要使用时间线索进行碰撞时间估计;时间结构不一致时,被试通过整合时间结构和视觉速度线索进行估计。     

胃肠调节类中西药对胃肠道平滑肌的双向调节作用

在不同条件下，单味、复方中药对胃肠道平滑肌可产生双向调节作用。其可能机理为多层次网络系统的平衡调节等。从整体、离体器官、分子水平，单一、配对西药也对胃肠道平滑肌产生双向调节作用。这种双向调节作用充分体现网络系统平衡调节的整体性的哲学内涵，遵循对立统一规律辩证哲学观。     

Effects of Interpretation Training on Hostile Attribution Bias and Reactivity to Interpersonal Insult

Research suggests that individuals high in anger have a bias for attributing hostile intentions to ambiguous situations. The current study tested whether this interpretation bias can be altered to influence anger reactivity to an interpersonal insult using a single-session cognitive bias modification program. One hundred thirty-five undergraduate students were randomized to receive positive training, negative training, or a control condition. Anger reactivity to insult was then assessed. Positive training led to significantly greater increases in positive interpretation bias relative to the negative group, though these increases were only marginally greater than the control group. Negative training led to increased negative interpretation bias relative to other groups. During the insult, participants in the positive condition reported less anger than those in the control condition. Observers rated participants in the positive condition as less irritated than those in the negative condition and more amused than the other two conditions. Though mediation of effects via bias modification was not demonstrated, among the positive condition posttraining interpretation bias was correlated with self-reported anger, suggesting that positive training reduced anger reactivity by influencing interpretation biases. Findings suggest that positive interpretation training may be a promising treatment for reducing anger. However, the current study was conducted with a non-treatment-seeking student sample; further research with a treatment-seeking sample with problematic anger is necessary.