Germ aversion is a risk factor for chronic low back pain and shoulder pain under the COVID-19 pandemic: an internet-based panel study.

The COVID-19 pandemic has increased germ aversion, an aversive affective response to a high likelihood of pathogen transmission. While psychological factors are associated with chronic pain, the relationship between germ aversion and chronic pain remains unexplored. This study aimed to examine the relationship between germ aversion and new-onset and prognosis of chronic pain using longitudinal data collected during the COVID-19 pandemic. We conducted web-based surveys of full-time workers at baseline and after three months. Data were collected on demographic characteristics, psychological factors, and chronic pain. Germ aversion was assessed using a modified Perceived Vulnerability to Disease scale. We analyzed responses from 1265 panelists who completed the survey twice. The prevalence of chronic low back pain (CLBP) and chronic neck and shoulder pain (CNSP) was associated with sex, short sleep duration, psychological distress, loneliness, and germ aversion. Stratified analyses showed that germ aversion was a risk factor for CLBP at three months in both individuals with and without CLBP at baseline, and for CNSP at three months in those with CNSP at baseline, even after adjustment for confounders. In conclusion, this preliminary study suggests that high germ aversion is a risk factor for CLBP and CNSP in young and middle-aged workers.

Exercise effect on pain is associated with negative and positive affective components: A large-scale internet-based cross-sectional study in Japan.

Pain is a global health problem that leads to sedentary behavior and tends to cause negative emotion. In contrast, exercise is widely recommended for a health promotion, while pain often worsens with physical activity. Although exercise therapy is often prescribed to people with pain, the mechanisms of exercise effect on pain remains unclear. In this study, we tried to identify a universal association factor between regular exercise and pain intensity utilizing a cross-sectional web-based survey involving 52,353 adult participants from a large national study conducted in Japan. Using principal component analysis, we uncovered a mediation model of exercise effect on pain through psychological components. Analyses were performed in half of the population with pain (n = 20,330) and validated in the other half (n = 20,330), and showed that high-frequency exercise had a significant association with reduction in pain intensity. We also found Negative Affect and Vigor, two psychological components, are fully associating the exercise effect on pain (indirect effect = - 0.032, p < 0.001; association proportion = 0.99) with a dose-dependent response corresponding to the frequency of exercise. These findings were successfully validated (indirect effect of high-frequency exercise = - 0.028, p < 0.001; association proportion = 0.85). Moreover, these findings were also identified in subpopulation analyses of people with low back, neck, knee pain, and the tendency of the exercise effect on pain was increased with older people. In conclusion, the effect of exercise on pain is associated with psychological components and these association effects increased in parallel with the frequency of exercise habit regardless pain location.

Association between smoking and central sensitization pain: a web-based cross-sectional study.

PURPOSE: This study aimed to investigate whether smoking is an independent risk factor for central sensitization syndrome (CSS) in individuals with pain as measured by the Central Sensitization Inventory (CSI). METHODS: In 2020, we conducted an Internet survey targeting 2000 ordinary residents of Japan (aged 20-69 years) who had pain symptoms from October to November 2020. A multiple regression analysis was performed on the association between smoking status (nonsmokers and current smokers; Brinkman index) and CSI values. Moreover, compared to nonsmokers, the relative risk (RR) of the CSI cut-off score of 40 points or higher among current smokers was calculated using a modified Poisson regression model. Covariates included age, sex, body mass index, marital status, equivalized income, exercise habits, history of hypertension, history of hyperlipidemia, history of diabetes, pain chronicity, and Pain Catastrophizing Scale score. RESULTS: This study analyzed 1,822 individuals (1,041 men and 781 women). Among those experiencing pain, current smoking was associated with the increase in CSI values (ß = 0.07). The Brinkman index was also significantly associated with the increase in CSI values (ß = 0.06). Current smoking also increased the risk of being over the CSI cut-off score, with a relative risk (RR) of 1.29 (95% confidence intervals, 1.04-1.60). Younger age, being women, experiencing chronic pain, and higher pain catastrophizing thinking were also significantly associated with increased CSS severity, independent of smoking status. CONCLUSION: Smoking is an independent risk factor for CSS. This indicates that smoking may be an important factor in the management of central pain disorders.

Impact of continued mindfulness practice on resilience and well-being in mindfulness-based intervention graduates during the COVID-19 pandemic: A cross-sectional study.

Aim: The coronavirus disease 2019 (COVID-19) pandemic has caused unprecedented stress. Mindfulness-based interventions (MBIs) are known to be effective in reducing stress. However, it is unclear how long-term outcomes differ between those who continue mindfulness practice after MBIs and those who do not. In this study, we hypothesized that those who continued mindfulness practice would have higher stress tolerance, and we examined this hypothesis through a survey of MBI graduates. In this study, we examined the association between the continuation of mindfulness practice among MBI completers and individual stress during the COVID-19 epidemic. Methods: A cross-sectional survey of MBI graduates was conducted. The physical and mental health states were compared between those who established a habit of mindfulness practice (practice group) and those who did not (no practice group). Results: The data were collected from 95 participants (response rate: 53.7%). Of the total respondents, 66 (69.5%) practiced mindfulness. Although the degree of perceived stress due to the COVID-19 pandemic was not statistically different between the practice and no practice groups, the practice group showed significantly lower levels of depression (p = 0.007), higher levels of resilience (p = 0.006), higher levels of overall health (p = 0.006), and higher levels of mental health (p = 0.039). The effect of mindfulness practice on reducing depression was fully mediated by resilience. Conclusion: Among MBI graduates, those who regularly practiced mindfulness had lower levels of depression and higher levels of physical and mental health. Thus, the continuation of mindfulness practice increases resilience, buffers against new stressors such as the COVID-19 pandemic, and has the potential to prevent depression.