Anxiety Clinical Trial
Official title:
The Influence of Hatha Yoga Practice on Stress and Cognitive Performance
Verified date | May 2023 |
Source | University of Vienna |
Contact | n/a |
Is FDA regulated | No |
Health authority | |
Study type | Interventional |
It has been indicated in recent research that Mindfulness-based interventions may offer possibilities of promoting human stress processing and reducing anxiety or depression. They also appear to positively influence cognitive performance. One mindfulness-based intervention next to a variety of others is yoga, a combination of physical, spiritual, and mental practices of Indian origin that arose to alleviate suffering and enhance psychological and physical well-being. The goal of the study is to find out how Hatha Yoga, the most common form of yoga, consisting of stretches, yoga postures and conscious breathing, affects emotional and cognitive processes. An essential part of yoga seems to be the increase of self-regulation and consequently the regulation of stress processing and of cognitive processes in general. Building on the Attentional Control Theory, it is hypothesized that anxiety and stress limit inhibitory function - the ability to block distracting, irrelevant information - and also impair the shifting of attention that normally accompanies smooth switching between different tasks and their processing requirements. In a randomized controlled trial with an experimental and a waiting group, the investigators aim to investigate whether active participation in a 60-minute hatha yoga class (intervention) at least three times a week for two months leads to less experienced stress and improves inhibition and attentional shifting. The intervention period with pre- and postmeasurements is expected to start in early January 2022 and end in December 2022. To measure the effect of the intervention, the investigators use three experimental test tasks, one each to examine inhibition function (here, measured by distractor interference in visual search), switching between different tasks or sensory modalities (here, collected by comparing performance after passagewise alternation vs. repetition of a sound vs. light discrimination), and alternation between different stimulus features (here, determined by comparing passagewise repetition vs. alternation of target stimulus color in visual search). In all of the experimental tasks, behavioral data (reaction times and error rates) and, in two, additional electrophysiological measures (event-related potentials) are collected using EEG. To investigate the role of stress the investigators use questionnaires as well as biological stress markers from saliva. In addition, participants will receive a link to questionnaires to complete by the start of the yoga intervention. On top, trait mindfulness will be examined as a potential mechanism underlying the effects of yoga practice on attention and stress. The subjects' trait mindfulness will be assessed by questionnaire as well.
Status | Completed |
Enrollment | 98 |
Est. completion date | August 10, 2022 |
Est. primary completion date | August 10, 2022 |
Accepts healthy volunteers | Accepts Healthy Volunteers |
Gender | All |
Age group | 18 Years to 40 Years |
Eligibility | Inclusion Criteria: - healthy individual without mental or neurological disorder or disease - 18-40 years Exclusion Criteria: - Insufficient comprehension of the German language - Current mental or neurological disorders (except eating disorders) - Current or regular yoga practice in the past - Uncorrected visual or auditive impairment - Scull fractures or head concussions within the last 6 weeks - Non-existence of a vaccination or convalescence certificate of COVID-19 |
Country | Name | City | State |
---|---|---|---|
Austria | University of Vienna | Vienna |
Lead Sponsor | Collaborator |
---|---|
University of Vienna |
Austria,
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de Jong R, Toffanin P, Harbers M. Dynamic crossmodal links revealed by steady-state responses in auditory-visual divided attention. Int J Psychophysiol. 2010 Jan;75(1):3-15. doi: 10.1016/j.ijpsycho.2009.09.013. Epub 2009 Oct 9. — View Citation
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Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Change in switching between Attentional Control Sets | Switching between Attentional Control Sets will be measured by switching costs, meaning longer response times (RTs) for trial-by-trial switches than repetitions of a task, and hit rate. Both variables will be combined to assess the change in ability to switch between processing different features which is expected in the intervention group in comparison to the waiting control group. | Baseline plus 8 weeks | |
Primary | Change in task switching between modalities | Task switching between modalities will be measured by speed regarding switches between modalities and error rate in the respective (auditive and visual) modalities. The ability to switch between different modalities is expected to have changed in the intervention group in comparison to the waiting control group. Switching speed will be analyzed by using steady-state visual evoked potentials and auditory steady-state potentials (both measured with EEG) with tagged frequencies.
Switching speed and error rate will be combined to report task switching ability between modalities. |
Baseline plus 8 weeks | |
Primary | Change in inhibition function | Inhibition function will be measured by response time, hit rate and number of false alarms.
In addition, dependent electrophysiological variables will be the mean amplitudes of two event-related potential components, named N2-posterior contralateral (N2pc) and distractor positivity (Pd). Named variables will be combined to assess the change in inhibition function that is expected in the intervention group vs. the control group. |
Baseline plus 8 weeks | |
Primary | Change in attention shifting | Attention shifting will be measured by an event-related potential named N2-posterior-contralateral (N2pc) with EEG. When target-similar items are processed, N2pc should be different in the intervention group than in the control group. | Baseline plus 8 weeks | |
Primary | Change in self-reported stress | Self-reported stress will be measured with the Perceived Stress Scale (PSS), ranging from 0 to 40 points, with higher scores indicating higher perceived stress. | Baseline plus 8 weeks | |
Primary | Change in physiological stress | Physiological stress levels will be measured by biological markers (cortisol and alpha-amylase). Both are expected to have changed in the intervention group in comparison to the waitlisted control group, indicated by changed cortisol levels as well as changed alpha-amylase concentration.
Both cortisol and alpha-amylase levels will be combined to report physiological stress. |
Baseline plus 8 weeks | |
Primary | Change in self-reported anxiety | Self-reported anxiety will be measured with the State-Trait-Anxiety Inventory (STAI) form Y, ranging from 20 to 80, with higher scores correlating with higher anxiety.
Self-reported anxiety is expected to have changed in the intervention group in comparison to the waitlisted control group. |
Baseline plus 8 weeks |
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