Abstract
Objectives
Mindfulness skills have been shown to be an important attribute for mental and general well-being. The neurohormone oxytocin and resilience are established biological and psychological factors that are associated with mindfulness. This study aimed to elucidate the interaction of resilience and oxytocin levels as independent variables to predict mindfulness facets in university students.
Method
Participants (n = 96) were university students in Hong Kong who previously participated in a resilience study with no history of mental health disorders or substance abuse. Mindfulness and resilience were measured using the Chinese versions of the Five Facet Mindfulness Questionnaire and the Connor-Davidson Resilience Scale, respectively. Saliva samples were collected to measure oxytocin levels using an enzyme-linked immunosorbent assay kit. A moderator analysis was conducted to assess the associations between oxytocin levels (predictor) and the five facets of mindfulness (outcomes) under the moderation effect of resilience (moderator).
Results
The interaction between oxytocin and resilience levels predicted the nonreactivity facet of mindfulness. Specifically, oxytocin levels significantly and positively predicted nonreactivity in participants with low or moderate resilience levels, but not in those with high resilience.
Conclusion
This study showed the influence of oxytocin levels on mindfulness was significant only in participants with low or moderate resilience, suggesting that oxytocin might act on other factors instead of influencing mindfulness in individuals with high levels of resilience.
Pre-registration
This study is not pre-registered.
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The risk of experiencing psychological problems is particularly high among adolescents (Kessler et al., 2007; Pedrelli et al., 2015). Epidemiological data reveal that about 75% of the cases of mental health disorders start between the ages of 17 and 24 years (Mohr et al., 2014). A recent meta-analysis of 192 epidemiological studies showed that the onset of mental health disorders coincides with the manifestation of dramatic biological changes in the brain caused by the transition from childhood to adolescence (Solmi et al., 2022). Furthermore, the onset of mental health disorders was reported to reach its highest point by mid to late adolescence (Solmi et al., 2022). A higher number of cases of mental health disorders have been reported in university students when compared to the general population (Auerbach et al., 2016; Levecque et al., 2017; Stallman, 2010).
University students go through both the challenging transition to university life and a critical biological developmental period (Duffy et al., 2019; Wang et al., 2020). Students have described the transition as a “loss experience” suggesting that they experience a loss of their previous identity, social connections, and sense of place while confronting the challenges related to finding a new identity (Cage et al., 2021). At the same time, the adolescent brain is going through a fast-developmental phase characterized by heightened sensitivity to exposure to risks that are commonly found in the university environment (Duffy et al., 2019). For instance, university students may experience psychosocial stressors, financial strains, sleep disruption, pressure from academics and peers to conform, and high expectations from family members to excel (Duffy et al., 2019; Mohr et al., 2014; Ratanasiripong et al., 2018). Facing those stressors continuously and persistently contributes to the exacerbation or onset of mental health disorders among university students (Pedrelli et al., 2015). To confront the challenging environment at this critical period in life, skills such as resilience and mindfulness play an important supportive role (Davydov et al., 2010; Leary & DeRosier, 2012; Ramasubramanian, 2017).
Resilience refers to a process to adapt and recover when facing adversity, trauma, tragedy, threats, significant sources of stress, or other challenging life experiences (American Psychological Association, 2022; Davydov et al., 2010), which has been recently conceptualized as the outcome of a dynamic process to successfully adapt to stressors (Kalisch et al., 2019; Lau, 2022). Although resilience was traditionally viewed as a unitary construct, it involves the dynamic combination of factors, including biological factors such as genotype, psychological factors such as emotion regulation and coping strategies, and social factors such as social support (Kalisch et al., 2019). In the context of coping strategies, cultivating mindfulness is a promising approach to enhancing resilience due to its association with the promotion of positive affect (Pidgeon & Keye, 2014).
Mindfulness concerns lucid awareness as a way to understanding what is occurring before conceptual or emotional classification takes place (Brown et al., 2007). Dispositional mindfulness is therefore understood as the awareness that emerges through paying attention, in the present moment, intentionally and non-judgmentally. It is an important resilience factor associated with well-being (Brown & Ryan, 2003; Calvete et al., 2019). Dispositional mindfulness is distinct from mindfulness state, where the former is a natural and inherent ability in all individuals to be mindful in their daily lives; it is stable over time and is independent from mindfulness training (Burzler & Tran, 2022; Medvedev et al., 2017). On the other hand, state mindfulness is the degree of mindfulness of an individual at any particular point in time, and it refers to the act of actively engaging in mindfulness in a specific moment (Brown et al., 2007; Medvedev et al., 2017; Tanay & Bernstein, 2013). Although dispositional mindfulness is different from state mindfulness, they are highly associated, in which people with higher dispositional mindfulness are believed to be more frequently engaged in a mindful state. One of the most popular tools to assess mindfulness is the Five Facet Mindfulness Questionnaire (FFMQ; Baer et al., 2006), which measures mindfulness as an overall psychological construct having five dimensions, namely acting with awareness, describing, nonjudging, nonreactivity, and observing (Lecuona et al., 2021; Pelham et al., 2019). The FFMQ provides a summary of dispositional mindfulness and its specific components that provide measures of psychological well-being (Tang et al., 2019).
Higher levels of mindfulness have been associated with an increased use of adaptative coping strategies such as positive reappraisal and decreased use of maladaptive coping strategies such as rumination (Zhou et al., 2020). Increased awareness stimulates positive reappraisal of adversity leading to a better understanding of the situation, flexibility to reprioritize life areas, and the opportunity to build resilience as a response to facing negative events (Stefan & David, 2020). Research has shown that individual with “high mindfulness” and “non-judgmental” profiles of mindfulness reported less rumination when compared to individuals with “low mindfulness” and “judgmentally observing” profiles (Bravo et al., 2016, 2018).
Mindfulness training increases resilience, which leads to both positive emotion regulation (e.g., feeling calm and relaxed) and an increased ability to adapt in response to adversity (Ramasubramanian, 2017). The inclusion of mindfulness training has been recommended as a tool to reduce stress in university students and to improve resilience (Ramasubramanian, 2017). On the other hand, evidence shows that dispositional mindfulness can positively predict resilience in a large group of Japanese and Chinese university students (Yang & Oka, 2022). Another study conducted with university students found an association between mindfulness, resilience, and psychological well-being in which mindfulness and resilience predicted psychological well-being (Pidgeon & Keye, 2014). Therefore, exploring the levels of dispositional mindfulness and resilience in university students may indicate their ability to cope with adversity.
Given the beneficial effect of mindfulness on mental well-being, more recent studies tried to explore the underlying physiological mechanisms involved in mindfulness. One of the most commonly studied pathways is the oxytocin pathway. Oxytocin is a neuropeptide produced in the hypothalamus and secreted by the pituitary gland associated with the positive management of emotions and well-being due to its buffering effect on stress, depression, and anxiety (La Fratta et al., 2021; Takayanagi & Onaka, 2022; Tang et al., 2019). The role of oxytocin in mindfulness has come to light in studies evaluating the biological changes that occur after practicing mindfulness. For instance, mindfulness practice has been associated with high levels of oxytocin which suggests a synergic mechanism that involves the oxytocin system to improve emotional regulation and increase well-being. In a study with university students, salivary levels of oxytocin were measured after a brief mindfulness session, and increased levels of oxytocin in saliva were detected when compared to the control group (Bellosta-Batalla, Blanco-Gandía, et al., 2020). In another study, a mindful-based intervention did not only increase the levels of oxytocin but also empathy (Bellosta-Batalla, del Carmen Blanco-Gandía, et al., 2020). Furthermore, a mindfulness-based mental training program induced changes in oxytocin release as detected in plasma (Hoehne et al., 2022). Because mindfulness training has been shown to trigger an increase in oxytocin levels, it has been suggested that salivary oxytocin could be used as a biomarker to assess the effect of mindfulness-based interventions (Bellosta-Batalla, Blanco-Gandía, et al., 2020). These findings suggest the plausible involvement of oxytocin in mindfulness-induced positive changes in mental well-being.
To date, evidence on the role of oxytocin in mindfulness has mainly emerged from studies evaluating changes in oxytocin levels after mindfulness-based interventions, but the role of oxytocin in dispositional mindfulness is still not fully explored. To the best of our knowledge, only two studies reported the association between dispositional mindfulness and salivary oxytocin levels. For instance, salivary oxytocin levels were reported to negatively correlate with acting with awareness in a mixed group of lesbians, bisexual, and heterosexual women (Dickenson et al., 2019). In a Master’s thesis study, trait mindfulness was shown to negatively associate with salivary oxytocin levels during the recovery phase of a stress task at trend level (Bowlin, 2012). In contrast to the previous findings (Dickenson et al., 2019), dispositional mindfulness, as observed in the facet acting with awareness, has been associated with prosocial behavior and oxytocin is involved in social behavior processes (Churchland & Winkielman, 2012; Kil et al., 2021), which suggests a plausible positive association between dispositional mindfulness and oxytocin. For instance, people with higher level of awareness could be more aware of others’ needs in the social environment, which could facilitate prosocial behavior (Condon, 2019; Donald et al., 2019).
Oxytocin has also been reported to be a biological factor of resilience. A previous study has shown that oxytocin predicts greater positive emotions, which is associated with better resilience during stress situations (Young Kuchenbecker et al., 2021). Oxytocin can be a key supporting player in resilience because of its role in the regulation of social behaviors (e.g., pair bonding, recognition, and social interaction) (Feldman, 2020; Sharma et al., 2020). The activation of the oxytocin system is known to attenuate the stress response in social affiliative situations and is associated to increased resilience (Takayanagi & Onaka, 2022), suggesting another pathway that oxytocin could contribute to mental well-being in addition to the positive influence on mindfulness.
Mindfulness is shown to positively influence resilience and mental well-being through mindfulness intervention studies. On the other hand, the effect of mindfulness interventions could be moderated by resilience state before training. For instance, the effect of meditation intervention on improving mental well-being was found to be significant only in people with low to moderate levels of resilience but not in those with high resilience levels (Barczak-Scarboro et al., 2021). These findings suggest the moderating role of resilience in the positive effect of mindfulness. The modulating effect of resilience on dispositional mindfulness has been ignored in the current literature. Although oxytocin appears to positively be associated with both mindfulness and resilience, it remains unclear whether the association between oxytocin and dispositional mindfulness could be different in people with different resilience levels. For example, oxytocin can affect social support (Ozbay et al., 2007), a resilience factor that is independent from dispositional mindfulness. Hence, oxytocin may contribute more to resilience factors other than mindfulness in people with high resilience, which weakens the association between oxytocin and dispositional mindfulness.
This study aimed to investigate the moderation effect of resilience on oxytocin in predicting mindfulness facets in university students. Firstly, the association between dispositional mindfulness and oxytocin was determined, and secondly the modulating effect of resilience on the relationship between dispositional mindfulness and oxytocin was investigated. We hypothesized that there is a positive association between oxytocin with dispositional mindfulness and that this association may be moderated by resilience.
Method
Participants
A total of 96 participants from several universities in Hong Kong were included. Participants were students above 18 years of age who had simultaneously joined a related study that focused on the investigation of psycho-biophysiological markers of resilience using a stress-induction task (Lau et al., 2021). Baseline data were used in this study, and the resilience scores used in this study have been previously published (Lau et al., 2021). Participants were excluded if they had reported (1) a history of or currently suffering from any psychiatric or psychological disorders; (2) use of anti-inflammatory drugs; (3) pregnancy; (4) substance and/or alcohol abuse; and (5) with meditation background.
Procedure
The study was conducted in 2019 in Hong Kong before COVID-19. Power analysis for the statistic of multiple linear regression analysis with three independent variables (oxytocin levels, resilience scores, and their interaction term) was performed using the G*Power application to determine the sample size. The statistical power was set to 0.95 (β= 0.05), reliability of 95% (α= 0.05), and a moderate effect size of 0.15 (Pilot & Beck, 2006). The required sample size was 89. Participants were recruited through social media, poster advertisement, and an online platform using a snowball sampling method. On the experiment day, participants gave written consent and completed, in a quiet room, a set of questionnaires in Chinese to assess mindfulness and resilience. A separate questionnaire was used to collect the demographic information of the participants including age and gender. After completing the questionnaires, participants were guided by a researcher to provide a saliva sample (1 ml) using Salivette tubes (Starstedt, Nümbrecht, Germany). Participants were instructed to abstain from eating or drinking (except water) during the experiment and avoid consuming caffeinated products within 30 min prior to collection of the saliva sample. The saliva samples were centrifuged at 1000g for 2 min at 4°C, aliquoted, and stored at −80°C for further analysis.
Measurement of Oxytocin Levels in Saliva
Oxytocin levels in the saliva samples were measured using a commercially available enzyme-linked immunosorbent assay kit from Enzo Life Sciences (Farmingdale, NY, USA). Samples were processed in duplicate and analyzed according to the manufacturer’s instructions. The detection range of the oxytocin kit was 15.60–1000pg/ml. The intra-plate and inter-plate coefficients of variation were 5.32 and 3.01, respectively.
Measures
Mindfulness was measured using the FFMQ (Baer et al., 2006). The Chinese version of FFMQ was adopted in this study (Hou et al., 2014). It consists of 39 items capturing five facets of mindfulness namely observing (8 items; attention and focus on selective stimuli), describing (8 items; express experiences to self and others), acting with awareness (8 items; the movements chose based on quick judgment, rather than automatically), nonjudging (8 items; self-acceptance and empathy), and nonreactivity (7 items; detachment from negative affects). The questionnaire is rated on a 5-point Likert scale, ranging from 1 (never or very rarely true) to 5 (very often or always true) (Baer et al., 2006). A total of 19 negatively worded items (3 items from describing; all items from acting with awareness and nonjudging) were reverse scored. A higher score represented closer relevance to each description of the sub-scale, and that someone is more mindful in their everyday life. In this study, the inter-item consistency (Cronbach’s alpha) of the FFMQ ranged from 0.71 to 0.92, and the scale reliability (McDonald’s omega) of the FFMQ ranged from 0.67 to 0.92. The Cronbach’s alpha and McDonald’s omega values are listed in Table 1.
Resilience was measured using the Chinese version of the Connor-Davidson Resilience Scale (CD-RISC) (Connor & Davidson, 2003; Xiaonan & Jianxin, 2007). This scale consists of 25 items rated on a 5-point Likert scale from 0 (not true at all) to 4 (true nearly all the time). The sum of scores were calculated from the 25 items, higher scores represent higher resilience. In this study, the inter-item consistency (Cronbach’s alpha) of the CD-RISC was 0.89, and the scale reliability (McDonald’s omega) of the CD-RISC was 0.89.
Data Analyses
Statistical analyses were conducted using the Statistical Package for Social Science (IBM SPSS v28). A p < 0.05 was considered statistically significant. No missing data were observed in this study. Normality of continuous data was examined using the Kolmogorov-Smirnov test. Salivary oxytocin levels were found to be non-normally distributed. Therefore, non-parametric methods such as Spearman’s rho correlation and bootstrapping (5000 times) were adopted in this study. The association of oxytocin levels with resilience and the five facets of mindfulness was analyzed using Spearman’s rho correlation. To further investigate the association among oxytocin level, resilience, and the five facets of mindfulness, moderation analyses were performed using model 1 in the PROCESS macro v4.2 beta for SPSS (Hayes & Preacher, 2013). The association between oxytocin level (predictor) and the five facets of mindfulness (outcome variables) was tested under the moderation effect of resilience (moderator). The centered oxytocin level and resilience scores together with their interaction term were input into ordinary least squares regression models with 5000 bootstrap samples in predicting the five facets of mindfulness. Estimations of the independent variables (oxytocin levels and resilience) were performed for significant models to assess if the interaction of the independent variables predicts mindfulness facets. The significance of the interaction term is denoted by a significant increase in the R-squared (R2) value due to the inclusion of the interaction term in the model.
Results
Ninety-six young adults (mean age = 21.17 years; standard deviation, SD = 2.30) participated in this study (Table 1). Forty-seven of them were female (49%). The mean oxytocin levels in saliva were 38.31pg/ml (SD = 11.11). The resilience as well as the scores in each facet of FFMQ are shown in Table 1. Mean scores in each facet of FFMQ in our samples were compared with the Chinese community data (Hou et al., 2014). Scores in the observing and nonreactivity facets were significantly higher in our samples (p < 0.05) compared with those in the community samples (mean age = 49.14 years; SD =14.80, n = 230). On the other hand, scores in the nonjudging facet were significantly lower in our samples (p < 0.05) compared with those in the community samples (for more details, please refer to Table S1 in Supplementary Information). Spearman’s rho correlation analysis indicated a significant negative association between oxytocin levels and the nonjudging facet of mindfulness (rho= −0.22, p < 0.05), and a significant positive association between oxytocin level and the nonreactivity facet in FFMQ (rho = 0.30, p < 0.01), but not other mindfulness facets or resilience level (Table 2).
The ordinary least squares regression models that included the constant, centered oxytocin level, centered resilience level, and their interaction term in predicting the observing, describing, and nonreactivity facets of mindfulness were significant. However, the models that included the same independent variables in predicting the acting with awareness and nonjudging facets of mindfulness were non-significant (Table 3).
Estimations of the significant variables in predicting the observing, describing, and nonreactivity facets of mindfulness were conducted, and results are shown in Table 3. For predicting the observing facet, neither the oxytocin level, resilience level, nor their interaction were significant predictors of the observing facet. In the model predicting the describing facet of mindfulness, only resilience level (unstandardized β = 0.20, standard error = 0.04, t = 4.30, p < 0.001, 95% bias-corrected confidence interval ranged from 0.12 to 0.28), but not oxytocin level or their interaction, was found to significantly predict the describing facet of mindfulness. In the model predicting the nonreactivity facet of mindfulness, oxytocin level (unstandardized β = 0.11, standard error = 0.04, t = 3.21, p = 0.002, 95% bias-corrected confidence interval ranged from 0.05 to 0.20), resilience level (unstandardized β = 0.07, standard error = 0.03, t = 2.10, p = 0.04, 95% bias-corrected confidence interval ranged from 0.01 to 0.13), and their interaction (unstandardized β = −0.01, standard error = 0.00, t = -3.13, p = 0.002, 95% bias-corrected confidence interval ranged from −0.02 to −0.00) were significant predictors of the nonreactivity facet of mindfulness (Table 3). Specifically, the positive association between oxytocin levels and the nonreactivity facet of mindfulness was diminished with increasing levels of resilience (Fig. 1). At high resilience levels (i.e., 1 standard deviation plus the mean of resilience level), the association between oxytocin levels and the nonreactivity facet of mindfulness became non-significant (p = 0.88).
Discussion
The current study aimed to investigate the association between oxytocin levels and mindfulness facets as well as the moderation effect of resilience on their associations in a group of local university students. Our findings demonstrated a significant negative association of the salivary oxytocin level with the nonjudging facet of dispositional mindfulness, and a significant positive association with the nonreactivity facet of dispositional mindfulness in local university students. The moderation analysis further revealed that the positive association between oxytocin and the nonreactivity facet of mindfulness was moderated by resilience levels. Specifically, significant positive association between oxytocin and the nonreactivity facet of mindfulness was observed only in participants with low or moderate resilience levels and the association became non-significant in high resilient participants.
The mean scores of the describing and acting with awareness in our local university samples were comparable to those of the Chinese community samples (Hou et al., 2014). On the other hand, scores from the observing and nonreactivity facets in our samples were higher than those in the Chinese community samples, whereas scores from the nonjudging facet in our samples were lower than those in the Chinese community samples (Hou et al., 2014). Such discrepancy may be explained by the differences in age and education levels between the two samples. For instance, dispositional mindfulness has been reported to be higher in older adults in general (Shook et al., 2017), and when the community samples were mainly middle-aged adults (Hou et al., 2014), whereas our participants were all university students. Education level is another confounding variable to dispositional mindfulness with positive associations of education levels with the observing, describing, and nonreactivity facets of dispositional mindfulness has been reported (Lee & Zelman, 2019). In the community samples, around half of the participants completed primary or secondary school, whereas our participants were all university students. More importantly, the community sample included both meditators (n = 69) and non-meditators (n = 161), whereas our samples only included non-meditators. Such difference could impact our observed relationships between oxytocin and some of the mindfulness facets as well as the moderation effect of resilience on such relationships, since some mindfulness facets (i.e., observing, nonreactivity) are suggested to be compared only within populations with a similar level of cultivation of mindfulness (e.g., non-meditators or meditators), but not across populations (e.g., non-meditators versus meditators) (Burzler & Tran, 2022). We, therefore, expect a different finding may not be observed in meditators. As dispositional mindfulness is an important factor contributing to mental well-being, it is essential to understand its underlying biological mechanism that might inform better training paradigms.
In the present study, a significant negative association between oxytocin levels and the nonjudging facet of mindfulness was observed. Nonjudging of inner experience refers to taking a non-judgmental approach toward one’s thoughts and feelings (Baer et al., 2008). Several studies reported the positive association between oxytocin and cognitive appraisal, particularly in social cues, which may explain the negative association between oxytocin and nonjudging that we observed in the current study. For instance, oxytocin nasal spray has been shown to improve the accuracy of appraisal of affect from social cues, particularly positive social cues (Guastella & MacLeod, 2012), and reduce negative cognitive appraisal on social distress (Alvares et al., 2012). Similarly, intranasal oxytocin treatment has been shown to increase positive appraisal of one’s own overall relationship characteristics (Aguilar-Raab et al., 2019). In addition, salivary oxytocin has been reported to facilitate social awareness by drawing the attention to non-self-socioemotional cues such as facial expressions of others and environmental factors such as circumstances of cooperation versus competition, which helps us navigate social interactions appropriately and make decisions about pro-social or antisocial behavior toward others (Koven & Max, 2014). These findings suggest the involvement of oxytocin in cognitive appraisal that is opposite to the nature of nonjudging, which helps explain the negative association between nonjudging and salivary oxytocin levels. Nevertheless, describing and nonjudging were reported to be the only mindfulness facets that facilitate cognitive reappraisal (positive appraisal) resulting in an enhancement in resilience (Jones et al., 2019). Future studies are warranted to further understand the association of nonjudging with cognitive appraisal and reappraisal as well as the involvement of oxytocin. For instance, a randomized controlled trial can be conducted to investigate the effect of oxytocin nasal spray versus placebo on the ability of nonjudging, cognitive appraisal, and reappraisal as well as their concurrent changes.
Nonreactivity to inner experience is the tendency to witness feelings and thoughts come and go without being carried away by them, that is, without reacting (Baer et al., 2008). A significant positive association between oxytocin level and the nonreactivity facet of mindfulness was observed. Nonreactivity is known to buffer the reactivity to stress; improving the nonreactivity facet after mindfulness training helps reduce depression symptoms (Zou et al., 2020). High levels of nonreactivity facilitates the process to disengage from established but unhelpful responses by promoting mental states adaptively, inhibiting habitual responses or non-reacting which in turn gives time to generate new appraisals and solutions to challenging situations (Zou et al., 2020). It has been reported that nonreactivity is positively related to reappraisal and acceptance (Iani et al., 2019). The positive association between the nonreactivity facet of dispositional mindfulness and oxytocin may be explained by their mutual involvement in positive appraisal. Furthermore, oxytocin release from the oxytocinergic system is crucial for the mediation of self-soothing behaviors. Oxytocin release can be triggered by pleasant mental experiences such as positive thinking (e.g., thinking of a well-known or beloved person) or other pleasant situations, which inhibits the activity of noradrenergic neurons in the central nervous system leading to an anti-stress response (Uvnäs-Moberg et al., 2015). In this context, our results show a positive correlation between nonreactivity to inner experience and oxytocin levels which suggests that observing the inner experience without reacting could stimulate oxytocin release and have a self-soothing effect mediated by oxytocin.
The results of the ordinary least squares regression models demonstrated further that the positive association between nonreactivity and oxytocin was moderated by resilience levels. Specifically, the positive association between nonreactivity and oxytocin was observed only in participants with low to moderate levels of resilience but not in high resilient participants. The results indicate that oxytocin is important in contributing to nonreactivity when resilience levels are low. The oxytocin system facilitates adaptation, integration, and stability in changing environments; thus, it plays an important role in developing resilience (Takayanagi & Onaka, 2022). Previous studies have shown the buffering effect of oxytocin on stress reactivity (Love, 2018; Simeon et al., 2011), which is in line to the association between nonreactivity and oxytocin found in the present study. However, this association is only present in individuals with low resilience, which suggests that the role of the oxytocin system and the nonreactivity facet of mindfulness in individuals with low resilience is more significant. Building resilience may involve different resources and systems that work in conjunction in a direct or indirect, by acting on other subsystems, manner in order to enhance flexibility and resilience in the entire system (Feldman, 2021). Our results suggest that resources such as the oxytocin system and the nonreactivity facet of mindfulness are more significant resources that can be used in individuals with low resilience. Previous studies have shown that resilience mediates positive outcomes of mindfulness. For instance, a study on nursing students has shown that resilience mediates the negative relationship between dispositional mindfulness and burnout (Rees et al., 2015). Similarly, another study has shown that resilience mediates the negative relationship between mindfulness and stress (Bajaj et al., 2022). In addition, mindfulness and resilience has been previously reported to predict around 50% of the variance of psychological well-being in university students (Pidgeon & Keye, 2014). A study reported that low resilience levels tend to lead to increased gains following a mindfulness-based intervention opposite to what was observed in individuals with high resilience (Barczak-Scarboro et al., 2021). Evidence from previous studies and the moderating effect of resilience observed in this study suggest that mechanisms, such as pro-social behavior regulated by oxytocin, may be adopted by individuals with high levels of resilience rather than mindfulness.
In this study, the emphasis was on exploring the association between oxytocin, resilience, and dispositional mindfulness in university students. High trait mindfulness is associated with better cognitive functions and academic performance in college students (McBride & Greeson, 2023). Furthermore, cultivation of mindfulness and resilience are important for college students to buffer from distress encountered through university education and their future workplaces (Ng & Kong, 2022). Mindfulness-based programs, therefore, are recommended in university curricula. Our findings added to the literature that students with low to moderate resilience levels might be benefit more from these programs.
Limitations and Future Research
There are several limitations in this study. First, the saliva samples were collected after completing the questionnaires. The influence of the questionnaire task on the level of salivary oxytocin is unknown. According to the literature, most tasks that induced a fast release (below 30 min) of oxytocin involved proprioceptive stimulations (de Jong et al., 2015; Geva et al., 2020). On the other hand, stress-induced oxytocin release requires at least 30 min to elevate plasma oxytocin, which may take even longer to capture in saliva samples (Comes-Fayos et al., 2022; de Jong et al., 2015; Pierrehumbert et al., 2010). In our experiment, the duration of our participants to take the questionnaire before collecting the saliva samples was no more than 20 min. We, therefore, consider the effect of the questionnaire task on the level of salivary oxytocin to be minimal in our experiment. Nevertheless, future studies should consider collecting salivary samples before any tasks to be conducted in order to minimize any effect on the release of oxytocin. Moreover, although the moderation analysis provides valuable information on the hypothetical causal relationship among oxytocin, resilience, and mindfulness, the interpretation of findings is limited by the cross-sectional nature of the study. Clinical validations are, therefore, needed to evaluate the relationship among the variables and the mechanism behind the association. To prove the causal relationship, randomized controlled trials would be desired to determine the changes of oxytocin level before and after meditation practice in participants with different resilience levels. Double-blinded intranasal oxytocin versus placebo treatment could also be considered to determine the effect of oxytocin on mindfulness changes in participants with different resilience level. Last but not least, the current study relied on the use of self-report questionnaires to measure mindfulness, in which subjective bias is inevitable. Future studies may consider supplementing with the breath counting task (Levinson et al., 2014) as a more objective measure of mindfulness to more comprehensively capture mindfulness.
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This study was supported by the Early Career Scheme from the University Grants Committee (awarded to WKWL; Ref no: 28602319), and the Research Area Based Seed Fund from The Hong Kong Polytechnic University (awarded to BWML; Ref no: P0033824).
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WKWL contributed to the study conception and design, data collection and analysis, manuscript writing, and writing review and editing. DISV contributed to manuscript writing and writing review and editing. APLT, JNMC, and LHMN contributed to data collection. All authors contributed to the writing review and editing. All authors read and approved the final manuscript.
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Lau, W.KW., Sanchez Vidaña, D.I., Tai, A.PL. et al. The Differential Effect of Oxytocin on Mindfulness in People with Different Resilience Level. Mindfulness 14, 1882–1892 (2023). https://doi.org/10.1007/s12671-023-02186-5
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DOI: https://doi.org/10.1007/s12671-023-02186-5