Parental decision-making surrounding complicated births: the impact on parent-infant and infant-marital relationships

This paper reviews current research regarding the impact of birth complications on parental decisionmaking, and the resulting effects on parent-infant and infant-marital relationships. It discusses the importance of informed decision-making on parental satisfaction of the birthing experience, and the benefits of certain strategies, such as kangaroo care, in the facilitation of greater levels of attachment and improved relationships. The paper concludes with suggestions for future research areas to focus on finding better ways to prepare and support parents in these situations, thus improving the quality of relationships between parents and with their child.

Hormone therapy is associated with smaller achilles tendon diameter in active post-menopausal women

The effects of hormonal status and activity levels on Achilles tendon structure were examined in asymptomatic post-menopausal women. It was hypothesized that women using hormone replacement therapy (HRT) would have better tendon structure than those not using HRT and that active women would have poorer tendon structure than inactive women. Eighty-five women including 53 active women (regular golf players) and 32 controls (healthy but inactive women) recorded their HRT and menopausal history and underwent basic anthropometric measurements. Women were divided into two groups based on their hormonal status: those currently using HRT; and those who had never used HRT or ceased using HRT at least 12 months prior to the study. Achilles tendons were examined with ultrasound and categorized as normal or abnormal, and the diameter of each tendon (mm) was recorded. Active women had a greater prevalence of tendon abnormality ( P=0.10) and thicker Achilles tendons than inactive women ( P<0.05). Active women on HRT had less tendon abnormality ( P=0.056) than active women not on HRT and significantly less tendon thickness ( P<0.05). This study indicates that Achilles tendon diameter is greater in active post-menopausal women. Hormone replacement therapy appeared to ameliorate this effect in active women. A similar effect from HRT on the Achilles tendons of inactive women was not apparent.

Does family intervention for adolescent substance use impact parental mental health? A systematic review

Adolescent substance abuse is a prevalent problem and both individual and group family interventions are increasingly being used to assist families to cope. A literature review was conducted to identify whether individual and group family interventions for adolescent substance abuse enhance the mental health of parents and other family members. The review also sought to identify direct and indirect effects of family intervention processes on depressive symptoms and general distress. Based on quality criteria a total of nine studies were included. Of these, six quantitatively examined family intervention outcomes on family member mental health, with all six reporting positive effects. Four of the nine studies measured levels of depressive symptoms and three of these four studies reported significant direct effects of family intervention on parental depression. The positive effects were also found in the three qualitative studies included in the review. Indirect therapeutic mechanisms that contributed to mental health improvements included: reduction of stress symptoms, improved coping, improved family functioning, more effective parenting behaviours, attitude changes, perceived changes in relative’s substance use, and improved social support. The available literature suggests that a number of determinants of family mental health may potentially be impacted through family intervention for adolescent substance abuse. However, definitive conclusions cannot be made at this point as the literature is mostly descriptive and there have been few longitudinal studies or randomised controlled trials.

Parental awareness and attitudes about food advertising to children on Australian television

Objective: To assess parents' concern regarding television food advertising to children and the marketing methods used, their awareness of existing regulations and support for strengthening restrictions, and to determine whether these factors differ across sociodemographic groups.

Methods: A randomly selected sample of 400 parents of children under 14 years in all Australian States and Territories completed the cross-sectional telephone survey in March 2007. Data were weighted by metropolitan and regional population proportions.

Results: Parents were concerned about unhealthy food advertising to children (67.3%), use of popular personalities (67.7%), toys (76.4%), and advertising volume (79.7%). Older parents, of high socioeconomic status (SES), with fewer household televisions were more likely to be concerned. Only 47.4% of parents were aware of current regulations and those with a tertiary education were more likely to be aware: odds ratio (OR) 2.96 (95% CI: 1.55-5.65). Parents supported a change from self-regulation (92.8%), a ban on unhealthy food advertising to children (86.8%) and, to a lesser extent, a ban on all food advertising (37.3%).

Conclusions and implications: There was widespread parental concern about food advertising and strong support for tighter restrictions. Given that the existing regulations rely on complaints and awareness is low, particularly among parents with lower education levels, a system of external monitoring and enforcement is essential. Clearly more effective regulations are needed to protect children and parental support for this is high.

Are parental concerns about children's inactivity warranted, and are they associated with a supportive home environment?

This paper explores parental concern about children's activity levels and whether parents who are concerned about their child's activity provide a supportive environment, a sample of 615 parents of 5-6-year-old children and 947 parents of 10-12-year-old children completed a questionnaire. Just over 50% of parents reported they were concerned their child was not getting enough activity. Children of concerned parents were less active than those whose parents were not concerned. These findings suggest that parents who are concerned about their child's physical activity levels provided a less supportive environment for physical activity than parents who are not concerned. The challenge for public health will be to harness parental concerns and translate them into action.

Physiological, morphological and behavioural effects of selecting zebra finches for divergent levels of corticosterone

The effects of environmental stress on the physiology and behaviour of higher vertebrates has become an important avenue of research in recent years. Evidence from recent studies has suggested that the avian stress-related hormone corticosterone (CORT) may play a role in immunocompetence and sexual selection. We tested whether CORT is immunosuppressive by studying humoral and cell-mediated immune responses in populations of captive zebra finches selected for divergent peak levels of CORT. We also investigated whether selection for peak CORT has an effect on the quality of several sexually selected regions of the male zebra finch; in addition we compared morphometric parameters and the dominance ranking in males from the different selection lines. We also tested whether different components of the immune system compete for limited resources. We found that selection for divergent levels of peak CORT had little effect on humoral immunity, male sexual signal quality or dominance ranking. However, contrary to expectations, we did find a positive relationship between CORT titre and cell-mediated immunity, as well as a greater cell-mediated response in the birds selected for high CORT titre than those selected for low CORT titre. Consistent with predictions, significant negative relationships were found between both testosterone and CORT titre on humoral immunity. Birds from the low CORT lines were significantly larger in terms of skeletal size than those from the high CORT lines. Overall, our results suggest that the cell-mediated immune response is associated with a reduction in the humoral response, but only in males, and that there is no simple relationship between peak CORT levels and immune function.

Isolation and restraint stress results in differential activation of corticontrophin-releasing hormone and arginine vasopressin neurones in sheep

This study investigated sex differences in the stress-induced activation of neurons containing corticotrophin-releasing hormone (CRH), arginine vasopressin (AVP) and enkephalin in the paraventricular nucleus (PVN) of gonadectomized male and female sheep. Groups (n=3) of both sexes were either subjected to 90 min isolation and restraint stress (stress group) or were not stressed. Blood samples were taken every 10 min for 90 min prior to and after stress to monitor cortisol levels in plasma. Brains were harvested after 90 min of stress. Stress caused elevation of plasma cortisol levels to a similar extent in both sexes. Double-labeling immunohistochemistry for Fos and either CRH, AVP or enkephalin was undertaken to quantify the numbers of neurons staining for CRH, AVP and enkephalin that also immunostained for Fos. Stress increased Fos immunostaining in all cell types. There was a greater proportion of CRH than AVP neurons activated in stressed animals. There were no sex differences in the activation of CRH and AVP neurons although females had a greater proportion of enkephalin cells staining for Fos than males in both control and stressed animals. There were no differences between control and stressed animals in the proportion of cells co-staining for CRH and AVP. We conclude that isolation and restraint stress activates neurons producing CRH, AVP and enkephalin in sheep and that CRH may play a greater role than AVP in regulating adrenocorticotrophic hormone secretion in response to this stressor in sheep. Finally, isolation and restraint stress does not influence co-localization of CRH and AVP in sheep.

Is sex-specific mass gain in Cory's shearwaters Calonectris diomedea related to begging and steroid hormone expression?

Mass differences between the sexes of dimorphic bird species often appear early in the nestling development. But how do adults know how much to feed a chick in a sexually dimorphic species? Do chicks of the heavier sex beg more? We studied begging in Cory’s shearwaters Calonectris diomedea, a species with heavier adult and juvenile males than females. We found that begging rates and call numbers were not different between male and female chicks, but parameters of begging intensity differed between the sexes in their relationship to chick body condition. For the same body condition, males had significantly higher begging call numbers and rates. Acoustical parameters, which were analysed semi-automatically, included the lengths of call and silence intervals, the minimum, mean and maximum frequency in a call and the number of frequency peaks within a call. We found no consistent differences of acoustic begging call elements between the sexes. Male and female chicks did not differ in the levels of the steroid hormones testosterone or corticosterone in the second quarter of the nestling period, and the mechanism leading to sex-related differences in begging rates for a given body condition remains unknown.

Prolactin, body condition and the cost of good parenting: an interyear study in a long-lived seabird, Gould's Petrel (Pterodroma leucoptera)

1. The pituitary hormone prolactin is thought to play an important role in the promotion of parental care in birds and mammals. The level of care parents provide is, however, likely to be influenced by additional factors, such as their physiological condition at the time of breeding.

2. We examined relationships between parental body condition, plasma prolactin levels and reproductive performance in Gould's Petrels (Pterodroma leucoptera), a long-lived seabird. We predicted that parental body condition would correlate positively with both prolactin level and parenting intensity, as measured by the quality of the chick they produced. We also examined the effects of parenting intensity on parental body condition and reproductive success in the subsequent breeding season.

3. Body condition of male parents positively correlated with prolactin levels at the start of their second protracted incubation bout. The body condition of both parents correlated positively with the body condition of their chick at its peak mass. However, producing a good-quality chick did not negatively affect parental body condition or reproductive success the following year.

4. These results suggest that prolactin reinforces parental behaviour in parents in good body condition, which facilitates production of good-quality chicks. Moreover, good-quality parents consistently produce good-quality chicks with no apparent trade-off to their physical condition.

Parental exercise is associated with Australian children's extracurricular sports participation and cardiorespiratory fitness : a cross-sectional study

Background: The relationship between parental physical activity and children's physical activity and cardiorespiratory fitness has not been well studied in the Australian context. Given the increasing focus on physical activity and childhood obesity, it is important to understand correlates of children's physical activity. This study aimed to investigate whether parental exercise was associated with children's extracurricular sports participation and cardiorespiratory fitness.

Methods: The data were drawn from a nationally representative sample (n = 8,484) of 7–15 year old Australian schoolchildren, surveyed as part of the Australian Schools Health and Fitness Survey in 1985. A subset of 5,929 children aged 9–15 years reported their participation in extracurricular
sports and their parents' exercise. Cardiorespiratory fitness was measured using the 1.6 km (1- mile) run/walk and inaddition for children aged 9, 12 or 15 years, using a physical work capacity test (PWC170).

Results: While the magnitude of the differences were small, parental exercise was positively associated with children's extracurricular sports participation (p < 0.001), 1.6 km run/walk time (p < 0.001) and, in girls only, PWC170 (p = 0.013). In most instances, when only one parent was active, the sex of that parent was not an independent predictor of the child's extracurricular sports participation and cardiorespiratory fitness.

Conclusion: Parental exercise may influence their children's participation in extracurricular sports and their cardiorespiratory fitness levels. Understanding the correlates of children's extracurricular sport participation is important for the targeting of health promotion and public health interventions, and may influence children's future health status.

Study of the natriuretic peptide hormone system in plants

In this study, both physiological and cellular effects are elicited by natriuretic peptides (NPs), a novel type of plant hormone. It was found that rat ANP (rANP) influenced stomatal opening movement in Tradescantia sp., where a significant increase in stomatal opening was observed in the presence of 1 µM rANP. Furthermore, this effect is mediated by cGMP, a (putative) second messenger of NPs. Two inhibitors of guanylyl cyclase, LY 83583 and methylene blue, inhibited rANP-induced stomatal opening. In contrast, stomatal opening is induced in a concentration dependent manner by the cell permeant cGMP analogue 8-Br-cGMP. In addition it was found, that like in animals, the secondary structure of rANP is essential for rANP responses. Linearised rANP is biologically inactive. Since ANP elicit plant responses, an attempt was made to isolate NP analogues from plants. A protocol for partially purifying NP from plants was developed. It was found that two fractions eluted from an immunoaffinity chromatography column (0.5 M KCI eluted fraction and 0.75 M KCI eluted fraction) were biologically active. The level of cGMP in response to NPs was also tested. It is suggested that the receptor of NP is specific since only 0.75 M KCI eluted fractions increased cGMP levels in Zea mays root stele tissue. rANP did not elicit an effect on cGMP levels in this tissue and LY 83583 did not affect this response. It is therefore argued that a plant specific biologically active NP system is present in the stele and it is predicted that NPs modulate solute movement in this tissue. NPs also influence K⁺, Na⁺ and H⁺ fluxes in Zea mays root stele. Increase in both K⁺ and Na+ uptake were observed after 30 min., while H⁺ flux shifted immediately toward influx in the presence of both 0.5 and 0.75 KCI eluted fractions. Finally, a model is proposed for the effect of NPs on solute movement and its signalling system in plants.

The impact of parental multiple sclerosis on the adjustment of children and adolescents.

Thirty-one parents with multiple sclerosis (MS) participated in a study to investigate the adjustment of their children, 24 boys and 24 girls aged 4 to 16 years. The majority of parents believed that their illness had an effect on their children. The perception of parents regarding their children's problems in the areas of emotions, concentration, behavior, or social interactions indicated that the children were at three times greater risk than the general community of developing psychological problems. In contrast, actual symptom scores reported by parents revealed that, although these children were at greater risk than the general community of developing peer problems, little difference was found on hyperactivity, emotional symptoms, conduct problems, or total difficulties. Parental negative affect predicted both parental reports of peer problems and perceptions that the parents' illness had an effect on their children. Parental relationship satisfaction and family income did not predict parental reports of children's level of adjustment. These results indicate that children of parents with MS demonstrate more difficulties in how they relate to others, the distress they experience, and how they manage their lives, rather than revealing higher levels of symptoms. Since the data were based on parental reports of their children's problems, the results may also be due to negative affect among the parents.

Parental status and childhood obesity in Australia

The overall aim of this study was to examine obesogenic factors in children from single and dual parent families. Data from the Longitudinal Study of Australian Children (LSAC) (8,717 children) were analyzed to examine the differences in children ’ s activity levels, dietary intake and BMI according to parental status and determine the likelihood of childhood overweight and obesity in a single-parent household. There were higher rates of overweight and obesity in girls aged four to nine whose parents were single (OR 1:60). Children in single-parent households watched more television, ate more food high in fat and sugar and less fresh fruit and vegetables than children from dual-parent households. The findings suggested that an additive effect of dietary and activity variables may contribute to the higher rates of overweight and obesity in Australian children, and that girls from single-parent households may be particularly at risk.

Physical activity in young children : a systematic review of parental influences

The primary aim of this review was to identify and evaluate the strength of associations of the key parental factors measured in studies examining early childhood physical activity (PA). A systematic review of the literature, using databases PsychINFO, Medline, Academic Search Complete, PSYCHinfo, and CINHAL, published between January 1986 and March 2011 was conducted; 20 papers were relevant for the current review. While 12 parenting variables were identified, only 5 of these had been investigated sufficiently to provide conclusive findings. There were inconsistencies in the findings involving the social learning variable parental enjoyment and variables involving parental behaviours such as maternal depression and self-efficacy, and rules for sedentary behaviour, and parental perceptions, which included perceived importance of PA, fear of safety, and perception of child’s motor competence. Given these inconsistencies, a metaanalysis was conducted to determine whether the method of measuring PA (objective or subjective) influenced the strength of associations between the parental factors and young children’s PA. There was no difference in the strength of associations in the studies that used objective or subjective measurement (via parent self-report). Further investigation is needed to clarify and understand the specific parental influences and behaviours that are associated with PA in young children. In particular, longitudinal research is needed to better understand how parental influences and PA levels of children during the formative preschool and early elementary school years are associated.

Family functioning, parental psychological distress and child behaviours : evidence from the Victorian child health and wellbeing study

We examined, using data from the 2006 Victorian Child Health and Wellbeing Study (VCHWS), whether family functioning is associated with parental psychological distress and children’s behavioural difficulties. The VCHWS was a statewide cross-sectional telephone survey to 5,000 randomly selected primary caregivers of 0- to 12-year-old children between October 2005 and March 2006. Only parents or guardians of children aged 4–12 years (n = 3,370) were included in this study. After adjusting for sociodemographic variables and ethnicity, parents or guardians scoring higher on the family functioning scale (i.e., from poorly functioning households) were at greater risk of psychological distress and had children with lower levels of prosocial behaviour and higher levels of behavioural difficulties relative to those from healthily functioning households. Mental health prevention programmes addressing child mental and conduct problems should consider the family environment and target those families functioning poorly.