The effect of exercise and childbirth classes on fear of childbirth and locus of labor pain control

This study sought to track changes in intensity of fear of childbirth and locus of labor pain control in women attending an exercise program for pregnant women or traditional childbirth classes and to identify the predictors of these changes. The study was longitudinal/non-experimental in nature and run on 109 healthy primigravidae aged from 22 to 37, including 62 women participating in an exercise program for pregnant women and 47 women attending traditional childbirth classes. The following assessment tools were used: two scales developed by the present authors – the Fear of Childbirth Scale and the Control of Birth Pain Scale, three standardized psychological inventories for the big five personality traits (NEO Five Factors Inventory), trait anxiety (State–Trait Anxiety Inventory) and dispositional optimism (Life Oriented Test–Revised) and a questionnaire concerning socioeconomic status, health status, activities during pregnancy, relations with partners and expectations about childbirth. Fear of childbirth significantly decreased in women participating in the exercise program for pregnant women but not in women attending traditional childbirth classes. Several significant predictors of post-intervention fear of childbirth emerged: dispositional optimism and self-rated health (negative) and strength of the belief that childbirth pain depends on chance (positive).     

Event-related Desynchronization of Mu Rhythms During Concentric and Eccentric Contractions

The purpose of this study was to compare the electroencephalographic (EEG) patterns and reaction times (RTs) of muscle activation between concentric and eccentric biceps brachii contractions under the RT paradigm and to evaluate how the EEG patterns and RTs changed with practice. Sixteen subjects performed 3 sets of 30 repetitions of submaximal voluntary concentric and eccentric biceps contractions. RT, event-related desynchronization (ERD) patterns of mu rhythm onset, and ERD amplitudes were selectively analyzed. Mental demand decreased as familiarity with the motor action increased due to practice regardless of contraction type. However, the 2 types of muscle contractions still have differences in brain activity regardless of decreased mental demand: eccentric contractions require earlier preparation than concentric contractions.     

Memories of labor and birth: reliability of post partum questionnaire reports

The stability of reports of feelings during vaginal births was assessed in three studies. In Study I, post partum reports from 475 primiparous women who participated in a childbirth preparation program were compared to identify differences between reports completed from the day of the birth to more than six weeks after the birth. In Study II, the post partum reports of 46 primiparous and 95 multiparous women completed 1, 3, or 6 mo. after giving birth were compared. In Study III, test-retest reliabilities were calculated for post partum reports completed by 22 primiparous and 16 multiparous women during the 5th and 7th post partum weeks. In these studies, reports of pain during labor were stable.     

Emotion During Pregnancy and Delivery as a Function of Repression-Sensitization and Number of Childbirths

Two hundred pregnant women were asked, before and after child delivery, to fill out a questionnaire about their feelings during pregnancy and childbirth. A day after delivery, they filled out the revised repression-sensitization (R-S) scale (Byrne, Barry, and Nelson, 1963). Results of the study showed four factors in the women's feelings during pregnancy and child delivery: (1) feelings of pain and anxiety during pregnancy, as well as evaluation of the pain they had suffered during delivery; (2) anxiety in the labor room; (3) fear of giving birth to a defective child: and (4) pain in the labor room. Repressors scored lower on the first three-factors than sensitizers; no significant differences were found between them in the fourth factor. Repressors also indicated that the birth pangs would influence them to postpone their next pregnancy to a lesser extent than did sensitizers. However, both indicated the same actual length of waiting time till their next pregnancy. A possible difference in time perspective between the two groups was suggested to explain this apparent inconsistency. Results also showed that primiparae scored lower on the first factor and higher on the fourth factor than did muitiparae.     

Attitudes toward consequences of pregnancy in young women attending a family planning clinic

This study examines the relationship between young women's knowledge and attitude concerning pregnancy and their sexual behavior. The study involved 78 young women (14-20 years of age) who had attended a midwestern family planning clinic. Primarily from a larger socioeconomic status, 70% of the participants said that they had never been pregnant. Adapting the testing methods of previous investigations, the study presented the participants with various exams intended to measure the following: 1) knowledge concerning "how babies are made"; 2) knowledge regarding intercourse and pregnancy; 3) anticipation of future consequences of adolescent childbirth; 4) anticipation of immediate consequences or fears of adolescent pregnancy. The study also examined the participants' contraceptive behavior and pregnancy history. The findings indicate that knowledge concerning understanding "how babies are made" does not influence sexual behavior, with no significant difference found between contraceptive users and non-contraceptive users. Also, the participants generally had accurate knowledge concerning intercourse and pregnancy. But the study did reveal significant differences in the evaluation of the consequences of pregnancy and childbirth. Those women who had previously been pregnant -- including those who had terminated their pregnancies -- showed a less negative attitude towards the consequences of pregnancy and childbirth than those who had never been pregnant. Furthermore, as the age of the women increased, the attitude became more positive. However, the study found that the attitude towards the consequences of pregnancy and childbirth had no impact on contraceptive behavior.     

Modulation of motor variability related to experimental muscle pain during elbow-flexion contractions

Experimental muscle pain typically reorganizes the motor control. The pain effects may decrease when the three-dimensional force components are voluntarily adjusted, but it is not known if this could have negative consequences on other structures of the motor system. The present study assessed the effects of acute pain on the force variability during sustained elbow flexion when controlling task-related (one-dimensional) and all (three-dimensional) contraction force components via visual feedback. Experimental muscle pain was induced by bolus injection of hypertonic saline into m. biceps brachii, and isotonic saline was used as control. Twelve subjects performed sustained elbow flexion at different levels of the maximal voluntary contraction (5–30% MVC) before, during, and after the injections. Three-dimensional force components were measured simultaneously with surface electromyography (EMG) from elbow flexors and auxiliary muscles. Results showed that force variability was increased during pain compared to baseline for contractions using one-dimensional feedback (P < .05), but no significant differences were found for three-dimensional feedback. During painful contractions (1) EMG activity from m. trapezius was increased during contractions using both one-dimensional and three-dimensional feedback (P < .05), and (2) the complexity of EMG from m. triceps brachii and m. deltoid was higher for the three-dimensional feedback (P < .05). In conclusion, the three-dimensional feedback reduced the pain-related functional distortion at the cost of a more complex control of synergistic muscles.     

Sex comparisons of the bilateral deficit in proximal and distal upper body limb muscles

Bilateral deficit (BLD) describes a phenomenon that the force produced during maximal simultaneous bilateral contraction is lower than the sum of those produced unilaterally. The aim of this study was to examine the potential sex-related differences in BLD in upper body proximal and distal limb muscles. Ten men and eight women performed single-joint maximal contractions with their elbow flexors and index finger abductors at separate laboratory visits, during which the maximal isometric voluntary contractions (MVICs) were performed unilaterally and bilaterally with a randomized order in the designated muscle group. Surface electromyographic (EMG) signals were recorded from the prime movers of the designated muscle groups (biceps brachii and first dorsal interosseous) during the maximal contractions. Both men and women demonstrated BLD in their elbow flexors (deficit: men = −11.0 ± 6.3%; women = −10.2 ± 5.0%). Accompanied by this force deficit was the reduced EMG amplitude from the dominant biceps brachii (collapsed across sex: p = 0.045). For the index finger abductors, only men (deficit = −13.7 ± 6.1%), but not women showed BLD. Our results suggested that the BLD in the proximal muscle group is likely induced by the decreased maximal muscle activity from the dominant prime mover. The absence of BLD in women’s index finger muscle is largely due to the inter-subject variability possibly related to the sex hormone flux and unique levels of interhemispheric inhibition.     

Infant feeding and maternal attitudes among mothers of low-income

Demographic variables, maternal attitudes, knowledge, practices, and support systems were examined in a sample of 50 women attending a public health clinic for well baby visits. Black women were nonsystematically selected an approached as they were waiting for their babies. Because the number of white women attending the clinic was small, an effort was made to include all of them. Data were obtained through individual interviews conducted by a trained interviewer. A questionnaire was constructed to obtain demographic information, information regarding prenatal awareness, delivery, mother infant interaction in the hospital, nutrition and infant care during the 1st year of life, and attitudes. 68% of the women were black and 32% were married. Most unmarried mothers lived with parents (50%), other relatives (26.5%), or ex husbands/boyfriends (5.9%). The mean educational level of 11.8 years was higher than anticipated for studies of public health department clinic populations. Teenagers made up 38% of the sample. 74% of the women reported family incomes below $8000. 64% had more than 1 child. Only 2 mothers in the sample had attended childbirth classes. 2/3 of the mothers recalled receiving no prior information about labor and delivery procedures and medications. Practices during the 1st few days after delivery indicate that only 20% of the mothers held their babires in the 1st hour after delivery and none of the mothers had the baby rooming in with them. 54% of the babies spent some time in the high risk nursery. This limited the mothers' opportunities to interact with and feed them. Only 3 of the mothers breastfed their babies for any length of time. 2 of them decided to breastfed because that was the best nutrition for the baby, and 1 did so because her mother had breastfed. The most common reasons given for bottlefeeding were not wanting to nurse (43.5%) and inconvenience (26.1%). Only 13% mentioned the necessity of back to school/work as a reason for not breastfeeding. No differences were observed between teenage mothers and older mothers in regard to the reasons for not breastfeeding. Since the number of breastfeeding mothers in this study was too small to permit statistical analysis, only scores for bottlefeeding mothers were compared. Bottlefeeding mothers of the low income group had statistically significant higher mean scores on 3 attitudinal scales: seclusion of the mother, acceleration of development, and mother's covert attitudes toward breastfeeding. Lower scores alone or with their spouses suggest that, when the childrearing responsibility was shared with extended family, mothers tended to be stricter with their children and minimized physical and emotional dependence of the children on them. Mothers who lived with spouses or alone tended to be more nurturing and less strict with their children.     

Measuring desire for control of health care processes

We conducted three known-groups studies to obtain discriminant validity information among potential self-report measures of the construct desire for control over health care processes. In the first study we looked at types of preparation for childbirth; in Studies 2 and 3 we investigated choice of a place in which to die and signing a Living Will. With none of the measures could we adequately distinguish those who had signed a Living Will (or intended to) from those who did not intend to sign one. The best discriminator of a choice of a place to die (hospital vs. home or hospice) and type of preparation for childbirth (Lamaze vs. other types of classes vs. no classes) was the Information subscale of Krantz's Health Opinion Survey (KHOS; Krantz, Baum, & Wideman, 1980). With the Behavioral Involvement subscale of the KHOS and our newly designed situation-specific measure of desire for control, we could only inconsistently discriminate among the groups. The generalized measure, Burger and Cooper's (1979) Desire for Control Scale, did not help us to discriminate among these groups. Correlations of these measures with demographic variables are provided and discussed.     

Intent and Choice Regarding Maternal Employment Following Childbirth

This study examined the impact of personal values, perceived spouse preference, and family income on maternal employment intent and maternal employment following childbirth. This study followed a sample of 70 expectant working mothers from the last trimester of pregnancy to 6 months following childbirth. Traditional gender role values and perceived spouse preference influenced maternal employment intent measured prior to childbirth. Maternal employment intent and marital partner's income influenced maternal employment 6 months after childbirth. The results of this study provided support for Brown's (1996) value-based theory of career choice. Results also suggested that some women who preferred to be withdrawn from the labor force had to work to provide greater family income.     

Pre- and Postpartum Fear of Childbirth in Nulliparous and Parous Women

The link between fear of childbirth and theories of anxiety in general is discussed. A possible expression of trait (T-fear) and state (S-fear) aspects of fear of childbirth was investigated in 77 nulliparous and 85 parous women based on data from gestational week 32, at 2 hours and at 5 weeks after childbirth. Data are based on the State Trait Anxiety Inventory and the Wijma Delivery Expectancy/Experience Questionnaire. According to their scores on the Wijma Delivery Expectancy/Experience Questionnaire during late pregnancy, women were divided into 3 groups: high, moderate and low levels of fear of childbirth. In gestational week 32, women in the low level of fear of childbirth group had lower trait anxiety than those in the moderate level of fear of childbirth group, who had lower trait anxiety than the women in the high level of fear of childbirth group. Nulliparous women had a higher level of fear of childbirth but a lower level of trait anxiety than did parous women. There was a significant decreasing trend in fear of childbirth from 2 hours to 5 weeks after delivery, in a parallel way for all 3 groups. Differences in fear of childbirth between nulliparous and parous women disappeared after delivery. These findings suggest that fear of childbirth comprises a considerable part of T-fear, with the risk of a vicious cycle, i.e. that during labour women experience what they are afraid of, which also influences the women's postpartum cognitive appraisal of the delivery.     

不同浓度罗哌卡因的硬膜外镇痛效应对自然分娩的影响

观察不同浓度的罗哌卡因与固定浓度的芬太尼配伍行硬膜外自控分娩镇痛的临床效果。随机选择80例ASAI级～Ⅱ级、头位、单胎足月妊娠要求分娩镇痛的初产妇,按双盲原则分为四组。观察产妇的生命体征、疼痛程度、运动能力、感觉变化、宫缩情况、产程及分娩情况,以及产妇满意度等。不同浓度的镇痛药其镇痛效果无显著性差异。0．15％罗哌卡因与2μg／ml芬太尼混合液用于硬膜外分娩镇痛效果良好,药量适中,基本无运动及感觉阻滞,对产程及新生儿无明显影响,是较为适合用于分娩镇痛的浓度。     

Standardized Goals and Performance Feedback Aggregated Beyond the Work Unit: Optimizing the Use of Engineered Labor Standards and Electronic Performance Monitoring

Electronic performance monitoring can monitor employee performance, while providing proximal goals and immediate feedback. A warehouse management system was enhanced to depict goal and performance on handheld wireless computers to improve order selection in an auto-parts aftermarket distribution center. Upon the onset of the intervention of an engineered labor standard and electronic performance monitoring, performance immediately increased by 24 units picked per hour per person and was maintained for the duration of the study, an increase of 12.9%. Evidence from this study suggests that performance goals and feedback can be aggregated beyond the work-unit level without decreasing the effectiveness of the intervention.     

面部反馈在微表情识别过程中的作用

本研究采用JACBART范式,通过考察增强面部反馈对高强度微表情识别的影响（实验1）和增强面部反馈对低强度微表情识别的影响（实验2）来探究面部反馈在微表情识别过程中的作用。结果发现：（1）增强面部反馈不能提高被试对高强度微表情识别的准确率;（2）增强面部反馈降低了低强度微表情的识别准确率。研究提示面部反馈参与了微表情的识别过程,但它是一种对微表情识别“有害”的抑制性线索,且这一线索的作用受微表情强度的调节。     

幼儿教师情绪劳动策略与职业倦怠的关系:基于潜在剖面分析

基于个体中心的视角考察幼儿教师情绪劳动策略和职业倦怠的关系,采用幼儿教师情绪劳动策略量表和职业倦怠量表对495名幼儿教师进行问卷调查。运用潜在剖面分析方法进行数据分析,结果表明：（1）幼儿教师情绪劳动策略可以分为四种潜在类别：积极型、内热型、珍爱型和冷淡型,其中积极型人数最多,冷淡型人数最少;（2）幼儿教师的职业倦怠得分在这四种潜在类别上有显著差异,冷淡型的职业倦怠得分最高,积极型次之,内热型和珍爱型的职业倦怠得分最低且无显著差异。研究结果为幼儿教师情绪劳动与职业倦怠的关系探讨提供了新的视角。     

Appraisals of Childbirth Experience and Newborn Characteristics: The Role of Hardiness and Affect

ABSTRACT Prior research has suggested an overlap between hardiness and negative affect in the prediction of self-reported health outcomes. A prospective study, investigating the relationships between hardiness and negative and positive affectivity in the prediction of postdelivery outcomes was conducted. Maternal appraisals of childbirth difficulty and success in coping with labor, maternal perceptions of the infant, and the amount of analgesic intake, as well as the objectively assessed difficulty of labor, were the outcome variables. Subjects were 73 pregnant women expecting their first baby. Hardiness and negative and positive trait affect were evaluated during the second trimester of pregnancy, while the dependent measures were assessed during labor and 48 hours after. Hardiness measured as an additive construct did not predict appraisals of the observed health event independent of negative affect. However, two hardiness subscales—commitment and challenge—and the interaction between challenge and control were found to predict outcomes independent of negative affectivity. The pattern of relationships between negative affect with both subjective and objective assessments of childbirth difficulty confirms previous research findings on symptom perception. Findings suggest an anxious cognitive style among nonhardy subjects and underscore the importance of the study of hardiness as an interactive construct.     

Women in labor: some issues about informed consent

Women wishing hospital admission for childbirth are asked to sign very general pre-admission consent forms. The use of such forms suggests that women in labor are considered incompetent to give informed consent. This paper explores some of the problems with advance directives and general consent, and argues that since women in labor are not generally incompetent, it is not appropriate to require this kind of consent of them.     

The effects of initial testing on false recall and false recognition in the social contagion of memory paradigm

In three experiments, participants studied photographs of common household scenes. Following study, participants completed a category-cued recall test without feedback (Exps. 1 and 3), a category-cued recall test with feedback (Exp. 2), or a filler task (no-test condition). Participants then viewed recall tests from fictitious previous participants that contained erroneous items presented either one or four times, and then completed final recall and source recognition tests. The participants in all conditions reported incorrect items during final testing (a social contagion effect), and across experiments, initial testing had no impact on false recall of erroneous items. However, on the final source-monitoring recognition test, initial testing had a protective effect against false source recognition: Participants who were initially tested with and without feedback on category-cued initial tests attributed fewer incorrect items to the original event on the final source-monitoring recognition test than did participants who were not initially tested. These data demonstrate that initial testing may protect individuals’ memories from erroneous suggestions.     

The effect of unilateral hand contractions on psychophysiological activity during motor performance: Evidence of verbal-analytical engagement

ObjectivesConscious engagement in movement control can influence motor performance. In most cases, the left hemisphere of the brain plays an important role in verbal-analytical processing and reasoning, so changes in the balance of hemispheric activation may influence conscious engagement in movement. Evidence suggests that unilateral hand contractions influence hemispheric activation, but no study has investigated whether there is an associated effect of hand contractions on verbal-analytical processing during motor performance. This study utilized psychophysiological (and behavioural) measures to examine whether pre-performance unilateral hand contraction protocols change verbal-analytical engagement during motor performance.DesignA repeated measures crossover design was employed.MethodsTwenty-eight participants completed three hand contraction protocols in a randomised order: left-, right- and no-hand contractions. Electroencephalography (EEG) measures of hemispheric asymmetry were computed during hand contractions. A golf putting task was conducted after each protocol. EEG connectivity between sites overlying the left verbal-analytical temporal region (T7) and the motor planning region (Fz) was computed for the 3 sec prior to movement initiation. Additionally, electrocardiography (ECG) and electromyography (EMG) signals were analysed 6 sec prior to movement initiation until 6 sec after. Golf putting performance (distance from the target) and putter swing kinematics were measured.ResultsContralateral hemisphere activity was revealed for the left-hand and right-hand contraction conditions. During motor planning, the left-hand contraction protocol led to significantly lower T7-Fz connectivity, and the right-hand contraction protocol led to significantly higher T7-Fz connectivity than the other conditions. EMG, ECG and kinematic measures did not differ as a function of condition. Importantly, T7-Fz connectivity mediated the relationship between hand squeezing and motor performance (distance from the target).ConclusionThe EEG results suggest that pre-performance unilateral hand contractions influence the extent of verbal-analytical engagement during motor planning, which in turn influences motor performance. However, the hand contractions did not influence cardiac activity, muscle activity or kinematics.     

Do Unilateral Right and Left Face Contractions Induce Positive and Negative Emotions? A Further Test of Schiff and Lamon's (1989) Hypothesis

Schiff and Lamon (1989) proposed that unilateral face contractions induce positive or negative changes in emotion depending on the side of contraction; support for this proposal, however, has been mixed. In a new test, 40 right-handed and 38 left-handed men performed four alternating face contractions (LRLR or RLRL) and, after each one, completed a different version of the Depression Adjective Checklist (Lubin, 1994). A repeated-measures ANCOVA failed to reveal any significant effect of side of face contraction or handedness on direction of emotion change. Instead, regardless of side of contraction, the subjects' negative emotional state increased significantly across the four contractions with the degree of change being significantly related to the subjects' reported level of difficulty in holding the contraction irrespective of whether the more difficult side was the left or the right.