Effects of Different Types of Exercise Training on the Cortisol Awakening Response in Children

Do movement behaviours influence the association between early menarche and depression symptoms among Brazilian adolescents?

Early menarche has been associated with adverse health outcomes, such as depressive symptoms. Discovering effect modifiers across these conditions in the pediatric population is a constant challenge. We tested whether movement behaviours modified the effect of the association between early menarche and depression symptoms among adolescents. This cross-sectional study included 2031 females aged 15-19 years across all Brazilian geographic regions. Data were collected using a self-administered questionnaire; 30.5% (n = 620) reported having experienced menarche before age 12 years (i.e., early menarche). We used the Patient Health Questionnaire (PHQ-9) to evaluate depressive symptoms. Accruing any moderate-vigorous physical activity during leisure time, limited recreational screen time, and having good sleep quality were the exposures investigated. Adolescents who experienced early menarche and met one (B: -4.45, 95% CI: (-5.38, -3.51)), two (B: -6.07 (-7.02, -5.12)), or three (B: -6.49 (-7.76, -5.21)), and adolescents who experienced not early menarche and met one (B: -5.33 (-6.20; -4.46)), two (B: -6.12 (-6.99; -5.24)), or three (B: -6.27 (-7.30; -5.24)) of the movement behaviour targets had lower PHQ-9 scores for depression symptoms than adolescents who experienced early menarche and did not meet any of the movement behaviours. The disparities in depressive symptoms among the adolescents (early menarche vs. not early menarche) who adhered to all three target behaviours were not statistically significant (B: 0.41 (-0.19; 1.01)). Adherence to movement behaviours modified the effect of the association between early menarche and depression symptoms.

Salivary Cortisol Levels after Hydrotherapy and Land-Based Therapy as a Marker of Stress in Children with Psychomotor Developmental Disorders: A Pilot Study

Background: The number of children experiencing postnatal situations of neurological risk (such as psycho-motor developmental disorders and delays) after birth has increased in recent years. These infants often require multiple pediatric interventions to address functional problems that might generate stress, anxiety, and discomfort. The aim of the present study is to determine whether the level of salivary cortisol, as a stress marker, increases after hydrotherapy and land-based therapy in children at risk of or currently presenting delayed psycho-motor development. Methods: Saliva samples were collected from 25 children (aged 3-36 months) between June 2022 and January 2023 at the Rehabilitation and Physical Medicine Clinical Management Unit of the Virgen de las Nieves University Hospital, Granada, Spain. Three samples were collected from each child, representing baseline, post-hydrotherapy and post-land-based therapy. Result: All salivary cortisol levels were within the normal range. Resting values were the highest, and both modes of therapy decreased salivary cortisol levels. There were no statistically significant differences between the two therapies. Conclusions: Both therapies appear to be useful for treating children with psychomotor developmental disorders without increasing stress during physiotherapy sessions. Although cortisol levels were slightly higher with hydrotherapy than with land-based therapy, this may be due to the small sample size.

Associations between anxiety disorders and depression symptoms are related to 24-hour movement behaviors among Brazilian adolescents

BACKGROUND

We tested whether 24-hour movement behaviors modified the effect of the association between anxiety and depression symptoms among adolescents.

METHODS

This cross-sectional study included 4141 adolescents aged 15 to 19 years (50.0 % females) across all Brazilian geographic regions. Using self-reported data, 4.4 % (n = 180) reported having been diagnosed with anxiety disorders. We used the Patient Health Questionnaire (PHQ-9) to evaluate depressive symptoms. Accruing moderate-vigorous physical activity during leisure time, <3 h/day of recreational screen, and good sleep quality were the exposures investigated. We evaluated interactions between anxiety and movement behaviors in the association with depression symptoms adjusted by covariates.

RESULTS

Adolescents diagnosed with anxiety who met two (B: -4.93; 95%CI: -6.43; -3.44) or three (B: -5.71; 95%CI: -7.85; -3.57) movement behavior targets, and adolescents without diagnosis of anxiety who met one (B: -6.97; 95%CI: -8.15; -5.79), two (B: -8.21; 95%CI: -9.38; -7.03), or three (B: -8.46; 95%CI: -9.66; -7.27) of the movement behavior targets had lower PHQ-9 scores for depression symptoms than adolescents with anxiety who did not meet any of the movement behaviors. There was a significant interaction (B: -1.89; 95%CI: -3.24; -0.55) between anxiety disorders status and meeting the movement behavior targets.

LIMITATIONS

The cross-sectional design is a limitation.

CONCLUSIONS

Variations in meeting movement behaviors modified the effect of the association between anxiety disorders status and depressive symptoms, with favourable modifications seen in adolescents without anxiety who met one, two or three of the movement behavior targets and in adolescents with anxiety who met two or three of the behaviors.

The effect of 8 weeks of child designed vs teacher designed games on physical fitness and creativity in children 8-10 years

A healthy and active lifestyle should start from an early age, as habits learned in childhood are more likely to endure. This study aimed to compare the effectiveness of child-designed games and teacher-designed games on the physical fitness and creativity of children aged 8-10 years. Thirty children participating in a sports club were randomly divided into two groups: teacher-designed games (TDG) and child-designed games (CDG). Subjects practiced two sessions per week for eight weeks, each session lasting 60 min. Fitness factors, such as strength, muscle endurance, aerobic fitness, agility, speed, and creativity were assessed by valid tests before and after the protocols. A repeated measure analysis of variance (ANOVA) was used to analyze the data. The TDG intervention led to a significant improvement in KTK (37.1% vs. -3.2%) and agility (-3.7% vs. -0.4%) compared to CDG intervention, while CDG intervention was associated with a significant improvement in aerobic capacity (10.1% vs. 3.6%) and in the elaboration of creativity test (23.3% vs. 8.6%). Both groups demonstrated substantial improvements in handgrip strength, static balance, long jump, flexibility, core endurance, and creativity tests, with no significant difference between groups. There were no significant changes in anthropometric features following the intervention. The implementation of combined teacher-designed and child-designed approaches in children's classrooms, in addition to promoting all aspects of physical fitness, may be effective in enhancing physical fitness and creativity.

Effect of acute game-based exercises on steroid hormones and cognitive performance in adolescents

PURPOSE

While exercise was found to affect cognitive performance in adolescents, the underlying mechanisms need to be considered. This study compared the effect of a 20 min game-based exercise with different intensities on hormonal responses and potential links to cognitive performance.

METHODS

37 adolescents (24 girls and 13 boys; 15-16 years of age) were randomly assigned into light intensity (LIG; 58.64% HR_max), vigorous intensity (VIG; 89.51% HR_max), and control group (CON). The concentration of salivary Testosterone and Cortisol was measured before, immediately after, 20 min and 60 min after the intervention.

RESULTS

Repeated-measure ANOVA revealed that neither light nor vigorous game-based exercise acutely affects Testosterone, while Cortisol was higher in the VIG, 20 min after the intervention compared to the LIG and CON. Furthermore, changes in Testosterone were negatively associated with changes in cognitive performance after the acute vigorous intensity exercise (r = -0.63, p = .039) and control condition (r = -0.78, p = .003), but positively associated with post-intervention cognitive performance after the acute light intensity exercise (r = 0.67, p = .012).

CONCLUSION

The intensity of game-based exercise affected Cortisol concentration in adolescents, while Testosterone concentration did not change after the intervention. On the other hand, exercise intensity plays an important role in the association between Testosterone concentration and cognitive performance.

The impact of gender differences, school adjustment, social interactions, and social activities on emotional and behavioral reactions to the COVID-19 pandemic among Japanese school children

The COVID-19 pandemic has had negative psychological effects, such as increased depression, anxiety, and suicide, on children worldwide, including in Japan. To effectively mitigate the negative impact of the pandemic among Japanese children, it is necessary to increase understanding of the culturally specific psychological effects on Japanese children, including age and gender differences, as well as related risk and protective factors. However, no previous research has quantitatively evaluated changes in Japanese children's emotional functioning before and after the pandemic began. The present study examined changes in Japanese children's emotional functioning with pre- and mid-pandemic questionnaires, particularly focusing on age and gender differences. The present study also explored the effects of school adjustment, social interactions, and lifestyle activities on children's emotional and behavioral functioning during the pandemic. Data were analyzed from 293 children from the southwestern region in Japan. The pre-pandemic questionnaire assessed emotional and behavioral functioning and school adjustment, while the mid-pandemic questionnaire assessed emotional and behavioral functioning, social interactions, and lifestyle activities. The results indicated that the COVID-19 pandemic negatively impacted the emotional functioning of Japanese children, especially younger boys. Pre-pandemic school adjustment negatively influenced emotional functioning. Spending time alone, spending little time with one's mother, poor sleep regulation, a lack of exercise, and a high frequency of playing video games were related to poor emotional and behavioral functioning. The findings imply that Japanese children, especially younger boys, may benefit from psychological interventions that promote social interactions, especially with their mothers, regulated sleep patterns, adequate exercise, and that support children in managing video game engagement, to mitigate the pandemic's negative psychological impact.

Exercise types and working memory components during development

Working memory is crucial to learning and academic success. Exercise has been found to benefit working memory in late life, but its effects during cognitive development are less clear. Building on findings that working memory is supported by the motor system, we highlight the sensitivity of different working memory components to acute and long-term exercise in children and adolescents. We also consider how the specific skill demands of endurance and coordinative exercise influence this sensitivity. Distinct effects of these exercise types are further linked with neurocognitive and neuroendocrine pathways. Our review suggests long-term rather than acute benefits of exercise for children and adolescents' working memory, which are more pronounced and specific for exercise with high coordinative demands.

Therapeutic Riding or Mindfulness: Comparative Effectiveness of Two Recreational Therapy Interventions for Adolescents with Autism

Therapeutic riding (THR) and HeartMath (HM) mindfulness-based interventions have promise for reducing stress in adolescents with autism spectrum disorder. In three 10-week periods, this study compared THR, HM, and control on salivary cortisol, self-reported stress, parent-reported social responsiveness, and heart-rate variability. This crossover design included 27 participants (12-21 years) randomly assigned to order of intervention. Findings suggest that HM and THR manualized protocols are equally beneficial in decreasing cortisol levels immediately following a session, but HM sessions had more impact on heart-rate variability. There was no significant effect on follow-up cortisol levels within a week after either intervention, but THR had more impact on decreasing some self-reported stressors.

Stress and Learning in Pupils: Neuroscience Evidence and its Relevance for Teachers

Our understanding of how stress affects primary school children's attention and learning has developed rapidly. We know that children experience differing levels of stressors (factors that cause stress) in their environments, and that this can influence how they respond to new stressors when they occur in educational contexts. Here, we review evidence showing that stress can increase children's attention and learning capacities in some circumstances but hinder them in others. We show how children differ in their attention and learning styles, dependent on stress levels: for example, more highly stressed children may be more distracted by superficial features and may find it harder to engage in planning and voluntary control. We review intervention research on stress management techniques in children, concentrating on psychological techniques (such as mindfulness and stress reappraisal), physiological techniques (such as breathing exercises) and environmental factors (such as reducing noise). At the current time, raising teachers' awareness of pupils' differing stress responses will be an important step in accommodating the differing needs of children in their classrooms.

A randomized controlled trial on the influence of two types of exercise training vs control on visuospatial processing and mathematical skills: The role of cortisol

While physical exercise training (PET) is undoubtedly very important for children and adolescents, there is still a lack of research dealing with the specific impact of different types of PET on cognitive and academic performance and the activity of the hypothalamic-pituitary-adrenal (HPA) axis. The purpose of this study was to compare the impact of two different types of exercise training on visuospatial processing and mathematical skills in adolescents with the analysis of cortisol. We randomly assigned 135 adolescents (12-15 years of age) into three groups: coordinative exercise (CE), cardiovascular exercise (CVE), and control (CON) group. Computerized cognitive test (matching grids), mathematical skills and salivary cortisol level were evaluated before and after 10 weeks of PET (three times per week for 45 min) after school. Reaction time of the matching grids task decreased in all groups while the accuracy was better in CE comparing to control. In addition, the CE group improved the mathematical skills. The participants who improved visuospatial performance had higher mathematics scores after the intervention. However, we did't find any effect of the exercise training intervention on salivary cortisol nor on the link between cortisol and visuospatial processing. Future research should analyze the moderators that influence this link.

The postnatal testosterone rebound in first-time fathers and the quality and quantity of paternal care

In human males, testosterone (T) decreases in the period following the birth of offspring. This decline has been widely interpreted as a facultative neuroendocrine response that facilitates parenting effort. Conversely, research on if (or when) this decline in T would be followed by an eventual recovery and subsequent shift away from parenting effort is lacking. In a U.S. community sample of 225 males transitioning to first-time fatherhood, we measured T at three occasions: third trimester, infant 3 months postnatal, and infant 9-10 months postnatal. Using a piecewise latent growth curve model (GCM), we detected a T rebound from when infants were 3 months old to when infants were 9-10 months old. The slope of this rebound was able to predict paternal care using two distinct measures: (a) an experience sampling method (ESM) that gathered data on paternal time allocation over the course of the study period and (b) independent coders rating fathers for the quality of paternal care during a structured task designed to elicit an infant fear response. As predicted, the more accelerated one's T rebound (slope), the less time fathers invested in their infants across the study period. However, we found a positive relationship between T rebound and quality of paternal care during a challenging activity. Discussion will focus on nuanced reasons that contribute to these findings as well as speculate on the ultimate function of a human paternal T rebound.

The effects of an exercise training on steroid hormones in preadolescent children - a moderator for enhanced cognition?

OBJECTIVE

Research demonstrates a variety of cognitive benefits induced by different chronic physiological stressors (e.g. motor vs. cardiovascular exercise training) and acute exercise to affect steroid hormone secretion, the present study aims to investigate 1.) motor vs. cardiovascular exercise training and their impact on salivary Testosterone, Estradiol and Progesterone and 2.) whether alterations in steroid hormones might moderate exercise-induced cognitive benefits.

METHODS

In a randomized control trial, 71 preadolescent children (39 girls) at the age of 9-10 years were randomly assigned to a cardiovascular exercise group (CE), a motor exercise group (ME) as well as a control group (CON) in which students were attending assisted homework. The participants attended their program three times per week, for a total of 10 weeks. Steroid hormones in the saliva, working memory performance and state-trait anxiety levels were determined before and after the intervention.

RESULTS

Statistical analysis showed no chronic changes in hormones through the interventions. Stepwise hierarchical regression revealed the Testosterone*ME-interaction to be a significant moderator for working memory performance post-intervention (β = 0.48, p = 0.014). Within the ME, increases of Testosterone from t₁ to t₂ were predicting higher working memory performance post-intervention (β = 0.45, R² = 0.16, p = 0.038).

CONCLUSION

Our findings suggest 1.) that motor-exercise-induced cognitive benefits are moderated by changes in Testosterone and 2.) that a 10-week exercise training of moderate intensity and with a motor demanding vs a cardiovascular character does not affect the chronic concentration of salivary Testosterone, Estradiol and Progesterone nor anxiety levels in preadolescent children.

The role of maternal environment on calibrating "Mini Puberty" in early infant development

The postnatal period is a time of increased brain development and plasticity which have enduring influences on brain and behavior. Infants demonstrate a transient surge in testosterone (T) during development referred to as "mini puberty". The utility of studying mini puberty in psychobiology has only recently emerged. Life-history theory postulates that infants "use" the maternal environment-pre and postnatally-to calibrate growth and timing of sexual maturity. As such, variability in infant T levels is not arbitrary and can be predicted by theory. We examine the role of maternal pre- and postnatal cortisol. Using saliva samples (n = 193 dyads), we predicted that higher levels of maternal cortisol are associated with higher levels of infant T. We found only maternal postnatal cortisol had a relationship with infants' mini puberty. This relationship was in the predicted direction and remained after controlling for numerous variables. Discussion will include the potential role of mini puberty as an inflection point where systems related to growth, sexual maturation, and psychosexual behavior can be calibrated and coordinated.

The effect of concurrent resistance-aerobic training on serum cortisol level, anxiety, and quality of life in pediatric type 1 diabetes

Background Given the importance of anxiety and quality of life for the mental health of children with type 1 diabetes (T1D), exercise prescription can be of crucial significance. The present study aims to explore the effect of concurrent resistance-aerobic training on serum cortisol level, anxiety, and quality of life among pediatric T1D. Methods Forty children (aged 8-14 years) were randomly assigned to experimental (n = 20) and control groups (n = 20) for 16 weeks. The exercise training program was composed of 16 weeks of interval concurrent resistance-aerobic training with a duration of 60 min performed three times a week. The subjects first performed the resistance training (20 min of Pilates exercises and 20 min of body weight-bearing exercises). Then, the aerobic exercises were performed with an intensity of 50-75% of maximum heart rate. Before and after the training, blood tests including cortisol were carried out on the subjects by RIA kit. Anxiety and quality of life were measured by the Revised Children's Manifest Anxiety Scale (RCMAS) and Pediatric Quality of Life (PedsQL), respectively. Body composition was measured by InBody. Data were analyzed by paired and independent t-test at p < 0.05 significance level. Results Sixteen weeks of concurrent resistance-aerobic exercise significantly reduced the anxiety index (p = 0.001) and increased the quality of life (p = 0.003). Although the cortisol index was increased, it did not reveal any significant differences between the experimental and control groups (p = 0.781). No significant differences were observed in the indices of quality of life, anxiety, and cortisol in the control group. Conclusions A 16-week program of concurrent resistance-aerobic training can improve the quality of life and anxiety among children suffering from T1D, but it may not influence the cortisol level (p > 0.05).