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See detailHealth benefits of walking in nature: a randomized controlled study under conditions of real-life stress.
Olafsdottir, Gunnthora; Cloke, Paul; Schulz, André UL et al

in Environment & Behavior (2018)

We investigated the effects of recreational exposure to the natural environment on mood and psychophysiological responses to stress. We hypothesized that walking in nature has restorative effects over and ... [more ▼]

We investigated the effects of recreational exposure to the natural environment on mood and psychophysiological responses to stress. We hypothesized that walking in nature has restorative effects over and above the effects of exposure to nature scenes (viewing-nature-on-TV) or physical exercise alone (walking-on-a-treadmill-in-a-gym) and that these effects are greater when participants were expected to be more stressed. Healthy university students (N=90) were randomly allocated to 1 of 3 conditions and tested during an exam-free period and again during their exam time. Mood and psychophysiological responses were assessed before and after the interventions, and again after a laboratory stressor. All interventions had restorative effects on cortisol levels (p < .001), yet walking in nature resulted in lower cortisol levels than did nature viewing (p < .05) during the exam period. Walking in nature improved mood more than watching nature scenes (p < .001) or physical exercise alone (p < .05). [less ▲]

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See detailTelNa: Implementation eines telefonischen Nachsorgeangebots für Rehabilitanden nach stationärer Alkoholentwöhnung
Van Dyck, Zoé UL; Krüger, Tim; Michel, Elliot et al

in SuchtAktuell (2018), 01.18

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See detailZusammenhang zwischen interozeptiver Genauigkeit und kardiovaskulärer Veränderung nach akutem Stress bei gesunden Frauen
Rost, Silke UL; Van Dyck, Zoé UL; Schulz, André UL et al

in Schächinger, H. (Ed.) Abstractband 43. Tagung Psychologie und Gehirn (2017)

Einleitung:Interozeption als afferente und Stressverarbeitung als efferente Informationsverarbeitung können als komplementär hinsichtlich der Kommunikation zwischen Körper und Gehirn verstanden werden. Es ... [more ▼]

Einleitung:Interozeption als afferente und Stressverarbeitung als efferente Informationsverarbeitung können als komplementär hinsichtlich der Kommunikation zwischen Körper und Gehirn verstanden werden. Es wurde gezeigt, dass stressbedingte veränderte kardiovaskuläre Prozesse mit veränderter Interozeption zusammenhängen und in körperlichen Beschwerden resultieren können. Wenig erforscht ist in diesem Kontext jedoch die psychologische sowie physiologische Erregung, welche mit einem akuten mentalen Stressor einhergeht. Ziel der vorliegenden Studie ist es, diese Lücke zu schließen und den Zusammenhang zwischen interozeptiver Genauigkeit und kardiovaskulärer Reaktivität und Erholung nach einem mentalen Stressor in einer gesunden Stichprobe zu untersuchen. Methode: Es wurde die Pulsfrequenz von 69 Frauen (MAlter = 24.20 Jahre, Range 18-50 Jahre; MBMI = 23.19, Range 17.19-34.48) zur späteren Bestimmung der Herzratenvariabilität (HRV) gemessen. Zur Bestimmung der interozeptiven Genauigkeiten führten die Teilnehmerinnen eine Herzschlagzählaufgabe durch und als mentalen Stressor setzten wir eine choice reaction time task (CRTT) ein. Die Pulsfrequenz wurde während der CRTT sowie während einer 10-minütigen Erholungsphase aufgezeichnet um Werte der kardiovaskulären Stressreaktivität und – erholung zu erfassen. Ergebnisse: DieErgebnisse zeigten keinen Zusammenhang zwischen interozeptiver Genauigkeit und HRV-Reaktivität auf akuten mentalen Stress (r = .042, p = .785). Der Zusammenhang zwischen interozeptiver Genauigkeit und kardiovaskulärer Stresserholung nach der CRTT war negativ (r = -.377; p = .012). Diskussion: Ergebnisse der vorliegenden Studie liefern erste Hinweise dafür, dass eine gute Interozeptionsfähigkeit mit einer besseren kardiovaskulären Erholung nach einem mentalen Stressor zusammenhängen, d.h. kardiovaskuläre Prozesse positiv beeinflussen kann. Interventionen zur Verbesserung der Interozeptionsfähigkeit könnten kardiovaskuläre Erholung erleichtern und das damit einhergehende Risiko zukünftiger Herz-Kreislauf- Probleme verringern. [less ▲]

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See detailGreen exercise is associated with better cell ageing profiles
Olafsdottir, Gunnthora; Cloke, Paul; Epel, Elissa et al

in The European Journal of Public Health (2016, November 01), 26(Suppl 1), 165021

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See detailThe Water Load Test As a Measure of Gastric Interoception: Development of a Two-Stage Protocol and Application to a Healthy Female Population
Van Dyck, Zoé UL; Vögele, Claus UL; Blechert, Jens et al

in PLoS ONE (2016), 11(9), 0163574

The sensitivity for one’s own internal body signals (i.e., interoception) has been demonstrated to play an important role in the pathogenesis of eating and weight disorders. Most previous measures ... [more ▼]

The sensitivity for one’s own internal body signals (i.e., interoception) has been demonstrated to play an important role in the pathogenesis of eating and weight disorders. Most previous measures assessing interoceptive processing have not, or only partly, captured perception of hunger and satiety cues, which is a core aspect of interoceptive deficits in eating disorders. In addition, methods used to measure sensitivity to gastric signals are heterogeneous and findings inconsistent. The primary aim of the present study was to establish a standardised test to measure gastric interoception, and to provide normative data using a non-clinical adult sample. The two-step Water Load Test (WLT-II) involves ingestion of non-caloric water until perceived satiation (step 1) and until maximum fullness (step 2). The WLT-II consists of several variables: Besides volumes of water ingested until satiation and maximum fullness expressed in ml, percentage of satiation to maximum fullness is calculated as an individual index of gastric interoception that is not confounded with stomach capacity. Ninety-nine healthy women participated in the study. Measures included the WLT-II, the heartbeat tracking test, a self-report questionnaire assessing subjective sensations, and the Eating Disorder Inventory-2. Twenty-eight participants underwent test-retest of the WLT-II. Results suggest that the WLT-II is a valid and reliable measure of gastric interoception. Importantly, satiation volume and percentage of satiation to maximum fullness were strongly positively related to self-reported bulimic symptoms, indicating that the WLT-II could emerge as a useful clinical tool to measure interoceptive processing in the field of eating disorders. [less ▲]

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See detailGerman version of the Intuitive Eating Scale: Psychometric evaluation and application to an eating disordered population
Van Dyck, Zoé UL; Herbert, Beate M; Happ, Christian et al

in Appetite (2016), 105

Intuitive eating has been described to represent an adaptive eating behaviour that is characterised by eating in response to physiological hunger and satiety cues, rather than situational and emotional ... [more ▼]

Intuitive eating has been described to represent an adaptive eating behaviour that is characterised by eating in response to physiological hunger and satiety cues, rather than situational and emotional stimuli. The Intuitive Eating Scale-2 (IES-2) has been developed to measure such attitudes and behaviours on four subscales: unconditional permission to eat (UPE), eating for physical rather than emotional reasons (EPR), reliance on internal hunger and satiety cues (RHSC), and body-food choice congruence (B-FCC). The present study aimed at validating the psychometric properties of the German translation of the IES-2 in a large German-speaking sample. A second objective was to assess levels of intuitive eating in participants with an eating disorder diagnosis (anorexia nervosa, bulimia nervosa, or binge eating disorder). The proposed factor structure of the IES-2 could be confirmed for the German translation of the questionnaire. The total score and most subscale scores were negatively related to eating disorder symptomatology, problems in appetite and emotional awareness, body dissatisfaction, and self-objectification. Women with eating disorders had significantly lower values on all IES-2 subscale scores and the total score than women without an eating disorder diagnosis. Women with a binge eating disorder (BED) diagnosis had higher scores on the UPE subscale compared to participants with anorexia nervosa (AN) or bulimia nervosa (BN), and those diagnosed with AN had higher scores on the EPR subscale than individuals with BN or BED. We conclude that the German IES-2 constitutes a useful self-report instrument for the assessment of intuitive eating in German-speaking samples. Further studies are warranted to evaluate psychometric properties of the IES-2 in different samples, and to investigate its application in a clinical setting. [less ▲]

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See detailGastrische Modulation der Schreckreaktion und gastrisch-evozierte Potenziale: zwei neue psychophysiologische Indikatoren für Interozeption des gastrointestinalen Systems
Schulz, André UL; Schaan, L.; Van Dyck, Zoé UL et al

in Kathmann, N. (Ed.) 42. Tagung Psychologie und Gehirn Abstractband (2016)

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See detailVariants of early-onset restrictive eating disturbances in middle childhood
Kurz, Susanne; Van Dyck, Zoé UL; Dremmel, Daniela et al

in International Journal of Eating Disorders (2015), 49(1), 102-106

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See detailWahrnehmung körperinterner Signale bei Bulimia Nervosa und Binge-Eating-Störung
Van Dyck, Zoé UL; Schulz, André UL; Blechert, J. et al

in Wittchen, H.-U.; Härtling, S.; Hoyer, J. (Eds.) Abstractband - Wieviel Psychologie steckt in der Psychotherapie? (2015)

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See detailShort-term food deprivation increases amplitudes of heartbeat-evoked potentials
Schulz, André UL; Ferreira de Sá, D. S.; Dierolf, Angelika UL et al

in Psychophysiology (2015), 52(5), 695-703

Nutritional state, i.e. fasting or non-fasting, may affect the processing of interoceptive signals, but mechanisms underlying this effect remain unclear. We investigated 16 healthy women on two separate ... [more ▼]

Nutritional state, i.e. fasting or non-fasting, may affect the processing of interoceptive signals, but mechanisms underlying this effect remain unclear. We investigated 16 healthy women on two separate days: when satiated (standardized food intake) and after an 18 h food deprivation period. On both days, heartbeat-evoked potentials (HEPs) and cardiac and ANS activation indices (heart rate, nLF HRV) were assessed. The HEP is an EEG pattern that is considered an index of cortical representation of afferent cardiovascular signals. Average HEP activity (R-wave +455-595 ms) was enhanced during food deprivation compared to normal food intake. Cardiac activation did not differ between nutritional conditions. Our results indicate that short-term food deprivation amplifies an electrophysiological correlate of the cortical representation of visceral-afferent signals originating from the cardiovascular system. This effect could not be attributed to increased cardiac activation, as estimated by heart rate and nLF HRV, after food deprivation. [less ▲]

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See detailGastrische Modulation der Schreckreaktion: eine prä-attentive Methode zur Abbildung afferenter Signale aus dem gastrointestinalen System
Schulz, André UL; Van Dyck, Zoé UL; Lutz, Annika UL et al

in Kaiser, J.; Fiebach, C. (Eds.) 41. Tagung Psychologie und Gehirn - Abstracts der Beiträge (2015)

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See detailGastrisch-evozierte Potenziale: ein neurophysiologischer Indikator für die kortikale Repräsentation afferenter Signale aus dem gastrointestinalen System
Schaan, L.; Van Dyck, Zoé UL; Lutz, Annika UL et al

in Kaiser, J.; Fiebach, C. (Eds.) 41. Tagung Psychologie und Gehirn - Abstracts der Beiträge (2015)

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See detailInterozeptive Sensitivität bei Bulimia Nervosa und Binge-Eating-Störung
Van Dyck, Zoé UL; Schulz, André UL; Blechert, J. et al

in Kaiser, J.; Fiebach, C. (Eds.) 41. Tagung Psychologie und Gehirn - Abstracts der Beiträge (2015)

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See detailEarly-onset restrictive eating disturbances in primary school boys and girls
Kurz, Susanne; Van Dyck, Zoé UL; Dremmel, Daniela et al

in European Child & Adolescent Psychiatry (2014)

This study sought to determine the distribution of early-onset restrictive eating disturbances characteristic of the new DSM-5 diagnosis, avoidant/restrictive food intake disorder (ARFID) in middle ... [more ▼]

This study sought to determine the distribution of early-onset restrictive eating disturbances characteristic of the new DSM-5 diagnosis, avoidant/restrictive food intake disorder (ARFID) in middle childhood, as well as to evaluate the screening instrument, Eating Disturbances in Youth-Questionnaire (EDY-Q). A total of 1,444 8- to 13-year-old children were screened in regular schools (3rd to 6th grade) in Switzerland using the self-report measure EDY-Q, consisting of 12 items based on the DSM-5 criteria for ARFID. 46 children (3.2 %) reported features of ARFID in the self-rating. Group differences were found for body mass index, with underweight children reporting features of ARFID more often than normal and overweight children. The EDY-Q revealed good psychometric properties, including adequate discriminant and convergent validity. Early-onset restrictive eating disturbances are commonly reported in middle childhood. Because of possible negative short- and long-term impact, early detection is essential. Further studies with structured interviews and parent reports are needed to confirm this study’s findings. [less ▲]

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See detailDie Bedeutung der Interozeption für eine gesunde Regulierung des Essverhaltens
Van Dyck, Zoé UL; Vögele, Claus UL

Scientific Conference (2014, March 17)

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See detailZusammenhänge zwischen Essverhalten und Interozeption: Der Einfluss von kurzzeitiger Nahrungsdeprivation auf die Herzschlagdetektion
Van Dyck, Zoé UL; Schulz, André UL; Vögele, Claus UL

in Verleger, R.; Krämer, U.; Beyer, F. (Eds.) et al Abstractband 40. Tagung "Psychologie und Gehirn" (2014)

Einleitung: Eine reduzierte interozeptive Wahrnehmung ist ein wichtiges Kernmerkmal von Essverhalten, das mit einem erhöhten Risiko für die Entwicklung von Essstörungen und Adipositas einhergeht. Die ... [more ▼]

Einleitung: Eine reduzierte interozeptive Wahrnehmung ist ein wichtiges Kernmerkmal von Essverhalten, das mit einem erhöhten Risiko für die Entwicklung von Essstörungen und Adipositas einhergeht. Die Wahrnehmung körperinterner Signale von Hunger und Sättigung ist beeinträchtigt und das Essverhalten ist von kognitiver Kontrolle, äußeren Reizen oder auch Affektzuständen gesteuert. Auf der anderen Seite wurde gezeigt, dass die experimentelle Manipulation von Essverhalten durch kurzzeitiges Fasten, die Genauigkeit der Wahrnehmung interozeptiver Signale erhöht. Ziel: Die vorliegende Studie hatte zum Ziel, den Ein-fluss von Nahrungsentzug auf die verschiedenen Dimen-sionen der Interozeption bei Individuen mit angemesse-nem und unangemessenem Essverhalten zu untersuchen. Methode: Insgesamt nahmen 46 gesunde Frauen an zwei unterschiedlichen Tagen an der Studie teil. In randomisierter Reihenfolge wurden sie nach 16-stündigem Fasten und nach einem standardisierten Frühstück getestet. Die Genauigkeit der Wahrnehmung interozeptiver Signale wurde mit Hilfe eines Herzschlagdetektionstests (Schandry) erfasst. Zusätzlich wurde die subjektive Einschätzung der interozeptiven Wahrnehmungsgenauigkeit, sowie intuitives und unangemessenes Essverhalten per Fragebogen erfasst. Ergebnisse: Die Genauigkeit im Herzschlagdetektions-test war nach kurzzeitigem Fasten erhöht. Außerdem konnte eine verringerte Herzfrequenz festgestellt werden. Emotionale Esser zeigten eine verringerte Herz-schlagdetekionsgenauigkeit und intuitives Essverhalten korrelierte positiv mit interozeptiver Genauigkeit. Es ließ sich kein Zusammenhang zwischen selbstberichteter interozeptiver Wahrnehmung und kardialer interozepti-ver Genauigkeit aufzeigen.Diskussion: Unsere Ergebnisse stehen im Einklang mit vorhergehenden Studien die zeigten, dass kurzzeitiges Fasten die Genauigkeit in Herzwahrnehmungsaufgaben erhöht. Allerdings scheint dieser Anstieg unabhängig zu sein von sympathischer Aktivierung. Unsere Ergebnisse legen nahe, dass durch Essverhalten die Wahrnehmung von Körpersignalen verändert werden kann. Dies impliziert weitere Untersuchungen dieses Zusammen-hangs bei Essstörungen. [less ▲]

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See detailInvestigation of the food choice process using hand movements in binge eating disorder
Van Dyck, Zoé UL; Schulte-Mecklenbeck, Michael; Blechert, Jens et al

Scientific Conference (2014)

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See detailResisting high calorie foods: Heart rate variability as an indicator of self-regulatory processes in restrained eating behaviour
Lutz, Annika UL; Van Dyck, Zoé UL; Vögele, Claus UL

in André, C; Bohn, T; Evers, D (Eds.) et al Nutrition, chronic health complications, and healthy ageing (2013, October 25)

INTRODUCTION. In our affluent western society many people, especially young women, try to restrict their food intake in order to conform to the society’s thin ideal in spite of the omnipresence of high ... [more ▼]

INTRODUCTION. In our affluent western society many people, especially young women, try to restrict their food intake in order to conform to the society’s thin ideal in spite of the omnipresence of high-calorie foods. However, this dieting behaviour is often linked to eating binges, leads to weight gain in the long run, and is the best established risk factor for eating disorders. Therefore, it is of great importance to study the factors associated with successful vs. unsuccessful control of eating behaviour. Restrained eaters are people who habitually try to resist high calorie foods in order to restrict their food intake and have been shown to be prone to a breakdown of self-regulation. Heart rate variability (HRV) is a psychophysiological measure calculated from heart rate. It serves as an indicator of self-regulatory capacity and effort because of neural linkages between heart and brain. Resisting high calorie foods is associated with an increase of state-HRV and temporarily depletes self-regulatory resources, a mechanism which could explain breakdowns in self-regulation of food intake. Therefore, the current study investigated the changes in HRV during confrontation with high vs. low calorie foods in restrained and unrestrained eaters. METHOD. After a three hour-fast, 60 female university students were exposed to either high (brownie) or low calorie food (carrot). They were asked to look at the food and smell it, but to refrain from eating it. Heart rate was continuously recorded during exposure, as well as during rest before and after exposure. Restrained eating was assessed with the Dutch Eating Behavior Questionnaire. RESULTS. HRV increased during exposure. This increase was characterised by an interaction of exposure condition and restrained eating. In the high-calorie condition, HRV increase was related to restrained eating. The higher the restrained eating scores, the stronger was the increase in HRV. In the low-calorie condition there was no significant association between HRV and restrained eating. DISCUSSION. The results suggest increased self-regulatory effort in highly restrained eaters when exposed to high calorie foods. In addition, restrained eaters seem to have spared their self-regulatory resources when exposed to diet-congruent low calorie food. These findings provide first insights into dietary strategies at a basic self-regulation level, using psychophysiological methods. In the long run, a detailed understanding of basic self-regulatory mechanisms in dietary restriction will help to develop strategies for healthy eating behaviour in normal-weight and over-weight populations. [less ▲]

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