Frequent Exposure Research Articles

Measurement Invariance of the Four-Item Entrapment Scale Short-Form (E-SF): A Transnational Examination Across Race/Ethnicity, Sexual Orientation, and Suicide Attempt History Among Minoritized Adults.

Feelings of entrapment-posited to arise when attempts to escape from defeating or humiliating circumstances are blocked-may confer increased risk for psychopathology and suicidal thoughts and behaviors (STB), particularly among minoritized individuals who often have more frequent exposure to such experiences. Including entrapment in empirical models may aid research efforts in further exploring its role in minority mental health. The Entrapment Scale Short-Form (E-SF), a brief version of the 16-item Entrapment Scale, is one tool that may be utilized toward this end; however, to do so meaningfully, its psychometric properties and measurement invariance must be evaluated in diverse samples. This study aimed to examine the factor structure, measurement invariance, and convergent validity of the E-SF across race/ethnicity and sexual orientation in a combined transnational sample of minoritized adults (total N = 1,194). Results supported a one-factor model of the E-SF that was invariant across samples, race/ethnicity, sexual orientation, and history of suicide attempt. Furthermore, significant positive correlations observed between theoretically relevant constructs of anxiety, depression, and posttraumatic stress disorder symptoms supported its convergent validity. Implications include disproportionate levels of entrapment experienced by minoritized individuals-particularly by sexual minorities-which likely reflect the discrimination frequently endured by these individuals.

Night Shift Work Associates with All-Cause and Cause-Specific Mortality: A Large Prospective Cohort Study.

Health problems associated with shift work and night shift work are gaining increasing public attention. To investigate the association between night shift work and the hazard of mortality. Prospective cohort study. A total of 283,579 individuals with paid employment or self-employment aged 37-73years were included from the UK Biobank with a median follow-up period of 14.0years. Participants were divided into day workers and shift workers, including the frequency of night shifts, to evaluate the association between baseline work schedules and all-cause and cause-specific mortality using the Cox proportional hazards model. Additionally, 75,760 participants with work histories were assessed for the association between average frequency and cumulative years of exposure to night shift work and all-cause and cause-specific mortality. Compared with that of day workers, the adjusted hazard of all-cause mortality was increased by 12.0% (hazard ratio [HR], 1.12; 95% confidence interval [CI], 1.07-1.18) in shift workers, particularly in those with no or rare night shifts (approximately 16.1%; HR, 1.16; 95% CI, 1.08-1.25) and those with irregular night shifts (approximately 9.2%; HR, 1.09; 95% CI, 1.00-1.19). Moreover, a non-linear relationship was identified between cumulative night shift years and all-cause and cause-specific mortality. Only individuals who worked night shifts for 20-30years exhibited a substantially increased hazard of all-cause (HR, 1.52; 95% CI, 1.15-2.00) and cardiovascular disease (CVD; HR, 2.08; 95% CI, 1.16-3.71) mortality. Shift workers, particularly those with rare or irregular night shifts, exhibited an increased hazard of mortality. Additionally, participants who worked night shifts for 20-30years exhibited a substantially increased hazard of all-cause and CVD mortality.

Sub-Concussive Impact Analysis in Collegiate Football Athletes

Contact athletes are at a significantly elevated risk of experiencing sub-concussive impacts—those that do not reach the threshold to cause typical concussion symptoms but may still contribute to long-term neurological damage (Johnson et al., 2014). Current literature suggests that repeated exposure to these impacts may be linked to neurodegeneration, potentially resulting in long-term cognitive deficits and neurodegenerative disorders in this group (Stern et al., 2011). Previous research has relied on helmet accelerometers to detect and quantify the magnitude of these impacts by measuring peak linear acceleration and peak rotational velocity(Champagne et al., 2019). However, numerous studies have revealed that helmet-mounted accelerometers often overestimate both the acceleration and the severity of impacts, leading to inaccuracies in data collection (Camarillo et al., 2013, Greybe et al., 2020, O’Connor et al., 2017). To overcome this limitation, we hypothesize that acceleration measurements obtained from mouthguard accelerometers will show significantly lower peak linear and rotational accelerations compared to helmet-mounted accelerometers when measuring impacts over the same duration in Queen's University Football players. Each participating player will be fitted with a custom boil-and-bite mouthguard accelerometer engineered by Prevent Biometrics, ensuring a closer coupling to the skull for enhanced measurement accuracy. The players will wear these mouthguards throughout training camp and the season, with each impact exceeding a 15-g threshold validated through video analysis. We expect that the study’s findings will include lower recorded peak linear velocity, peak rotational velocity and more frequent sub-concussive exposure due to the increased sensitivity of the device. These findings will support the current literature that mouthguard accelerometers offer an accurate representation of the forces experienced by athletes. These findings will contribute to the growing body of knowledge on sub-concussive exposure in football players. The research has the potential to identify high-risk hitting patterns and influence new protocols for concussion management. Ultimately, this could increase player safety and promote healthier athletic development across all levels of competition.

Synthesis and characterization of MWCNTs nanocomposite for fabrication of tensometric transducers

A nanocomposite was prepared using MWCNTs and micro-sized bronze particles dispersed in elastomer silicone organic compound (SILAGER 8030). The nano-composite was characterized by FT-IR, SEM, EDS and Raman spectroscopy; showing the rough surface of the composite with interweaving of nano threads. This nano-composite was used to manufacture strain gauge. The conductivities were measured concerning wt% of micro-sized bronze, compression and time. The maximum electrical conductivity obtained was 2.1 S/m at 5.0 wt% bronze metal alloy and MWCNT (3.0 wt%) at 16% compression. With increasing amplitude and frequency of ultrasonic exposure, an increase in the pressure associated with cavitation in the liquid was observed. Each value of ultrasound exposure corresponded to a certain value of electrical resistance. At the same time, with an increase in the intensity of the cavitation effect on the strain gauge transducer, extremum points appeared, which corresponded to a decrease in resistance. The developed material is highly useful for manufacturing strain gauges to be used in liquid ring vacuum pumps as a measuring transducer of liquid ring pressure into signals associated with changes in resistance. This allows liquid ring vacuum pumps to be precisely controlled; improving their energy efficiency and reliability.

Mitigating the impact of secondary traumatic stress and compassion fatigue among forensic interviewing professionals: utilization of the four quadrants of self-preservation to promote post-traumatic growth

Forensic interviewing professionals, who regularly engage with children and youth reporting traumatic experiences, are particularly susceptible to secondary traumatic stress (STS) and compassion fatigue (CF). This conceptual article delves into the occupational hazards associated with forensic interviewing, emphasizing the inevitability of STS and CF due to frequent exposure to harrowing accounts of abuse. The article underscores the importance of recognizing these phenomena and differentiating them from burnout—a critical distinction that guides appropriate interventions. Utilizing the "Four Quadrants of Self-Preservation," a trauma- informed framework, the article offers practical strategies for forensic interviewers to mitigate the impacts of STS and CF. This approach promotes resilience through intentional self-care practices across four stages of secondary trauma exposure: before, during, immediately after, and ongoing post-exposure to traumatic material. The article advocates for organizational support in implementing these strategies, emphasizing the ethical imperative to safeguard the well-being of forensic interviewers. The findings suggest that addressing STS and CF not only enhances the personal resilience of professionals but also improves client outcomes, by reducing the likelihood of turnover and professional errors. This article contributes to the growing body of literature calling for trauma-informed practices in forensic settings, highlighting the need for continued research and organizational commitment to support these professionals.

A novel approach to triazole fungicides risk characterization: Bridging human biomonitoring and computational toxicology

Brazil stands as the world's leading coffee producer, where the extensive use of pesticides is economically critical yet poses health and environmental risks due to their non-selective mechanisms of action. Specifically, triazole fungicides are widely used in agriculture to manage fungal diseases and are known to disrupt mammalian CYP450 and liver microsomal enzymes. This research establishes a framework for risk characterization of human exposure to triazole fungicides by internal-dose biomonitoring, biochemical marker measurements, and integration of high-throughput screening (HTS) data via computational toxicology workflows from the Integrated Chemical Environment (ICE). Volunteers from the southern region of Minas Gerais, Brazil, were divided into two groups: farmworkers and spouses occupationally and environmentally exposed to pesticides from rural areas (n = 140) and individuals from the urban area to serve as a comparison group (n = 50). Three triazole fungicides, cyproconazole, epoxiconazole, and triadimenol, were detected in the urine samples of both men and women in the rural group. Androstenedione and testosterone hormones were significantly reduced in the farmworker group (Mann-Whitney test, p < 0.0001). The data show a significant inverse association of testosterone with cholesterol, LDL, VLDL, triglycerides, and glucose and a direct association with HDL (Spearman's correlation, p < 0.05). In the ICE workflow, active in vitro HTS assays were identified for the three measured triazoles and three other active ingredients from the pesticide formulations. The curated HTS data confirm bioactivities predominantly related to steroid hormone metabolism, cellular stress processes, and CYP450 enzymes impacted by fungicide exposure at occupationally and environmentally relevant concentrations based on the in vitro to in vivo extrapolation models. These results characterize the potentially significant human health risk, particularly from the high frequency and intensity of exposure to epoxiconazole. This study showcases the critical role of biomonitoring and utility of computational tools in evaluating pesticide exposure and minimizing the risk.

Comparative analysis of artificial intelligence and expert assessments in detecting neonatal procedural pain

Assessing pain in newborns in the NICU is crucial due to their frequent exposure to painful stimuli, yet it's challenging due to the subjective nature of current methods. This study aimed to evaluate the effectiveness of an AI system designed for automatic facial recognition by comparing its performance with the expert opinion of health care provider. This is a secondary analysis from an eye-tracking study, assessing neonatal pain evaluations by healthcare professionals. The performance of AI software, FaceReader 9, was compared to experts' evaluations using a visual-analog scale, focusing on identifying specific facial action units associated with different pain levels. The study found significant differences in AI-generated metrics—arousal and valence—across three stimulus types: non-noxious thermal, short-noxious, and prolonged-noxious, with p-values below 0.001. A strong correlation (r = 0.84, p ≤ .001) was observed between AI metrics and expert ratings. Eleven facial action units were identified as relevant to describe neonatal pain. The findings highlight the AI system's potential in accurately detecting and analyzing newborn facial expressions in response to varying pain intensities, demonstrating a significant correlation with healthcare professionals' assessments. This suggests that AI technology could enhance objective pain assessment in neonates.

Re-Exposure to Culprit Medication Following Adverse Drug Event Diagnosis in Canadian Emergency Department Patients: A Cohort Study.

The magnitude of repeat exposures to culprit medications after hospital discharge is not well studied. We combined prospective cohort data with administrative health data to understand the frequency of repeat exposures to culprit medications after discharge and the risk factors for their occurrence. This was a retrospective analysis of three prospective cohorts of patients who presented to the hospital with an adverse drug event in British Columbia, from 2008 to 2015 (n = 849). We linked prospectively identified adverse drug events to administrative data to examine patterns of redispensing of culprit medications. We used Cox regression to assess risk factors for re-exposure, and conducted subgroup analyses for essential vs. nonessential medications. Among 849 diagnosed adverse drug events, 45.2% had subsequent culprit medication redispensing within a year of hospital discharge. The factors associated with re-exposures included atrial fibrillation, adverse drug event type (e.g. adverse reaction), culprit medication type, and longer historical duration of medication use. Re-exposures to culprit medications occurred in almost half of the adverse drug events diagnosed in emergency departments. Many of these were appropriate re-exposures to essential medications for indications in which the risk of uncontrolled disease likely outweighed the risk of a repeat adverse event. More research is needed to understand re-exposures to nonessential medications or medications with safer alternatives.

142: Utilization of a Silver-plated Dressing on Extracorporeal Membrane Oxygenation Cannulation Sites to Reduce Frequency of Insertion Site Exposure and Associated CLABSI Incidence

142: Utilization of a Silver-plated Dressing on Extracorporeal Membrane Oxygenation Cannulation Sites to Reduce Frequency of Insertion Site Exposure and Associated CLABSI Incidence

Occupational exposure and new-onset asthma in the population-based Telemark study: a 5-year follow-up

ObjectivesThis study aimed to estimate the incidence of asthma and assess the association between job exposure matrix (N-JEM) assigned occupational exposure, self-reported occupational exposure to vapour, gas, dust and fumes...

Night shift work and breast cancer risk – 2023 update of epidemiologic evidence

IntroductionNight shift work is a complex and frequent occupational exposure, and breast cancer stands as the most prevalent cancer in women. The International Agency for Research on Cancer (IARC) has twice classified night shift work as a probable breast carcinogen, with the latest classification in June 2019. Since that time, new epidemiologic data has emerged. MethodsWe searched PubMed for original articles based on cohort and case- control studies of “breast cancer and night shift work” published after the IARC evaluation in June 2019. ResultsIn total six cohorts and four case-control studies were included in our review. Overall, we observed some support for associations between persistent (long duration or high frequency) night shift work and an increase in breast cancer risk, though most studies were relatively small and statistically under-powered. Moreover, the recent studies do not contribute further evidence regarding the interaction with menopausal status, diurnal preference, hormonal subtypes of breast cancer or gene-environment aspects, which were issues that were left from the IARC evaluation. ConclusionThe available new results somewhat consolidate the epidemiological evidence from IARC's 2019 evaluation, and do not provide further evidence regarding interaction of interest, e.g. menopausal status, etc. Therefore, long term follow-up of prospective cohorts or nested case-control studies, including precise exposure assessment and examinations of relevant interactions such as menopausal status, diurnal preference, hormonal subtypes of breast cancer and gene-environment aspects, are warranted. Meanwhile, protective measures for the night workers should be considered.

Prevalence of tuberculosis among healthcare workers in India: a systematic review and meta-analysis.

Tuberculosis (TB) poses a significant occupational hazard for healthcare workers (HCWs) in India, a country bearing a substantial portion of the global TB burden. This systematic review and meta-analysis aim to determine the prevalence of TB among HCWs in India. Analyzing ten studies up to 2024, we found a pooled prevalence of 2391.6 cases per 100,000 individuals, underscoring the critical occupational risk. Factors contributing to this high prevalence include inadequate ventilation, insufficient personal protective equipment, and frequent exposure to multidrug-resistant TB strains. Our findings emphasize the urgent need for stringent infection control measures, routine TB screening, and comprehensive educational programs. Policy recommendations include developing national TB screening guidelines and improving healthcare infrastructure. Protecting HCWs is crucial to achieving India's goal of TB elimination by 2025.

Exposure to noise at home, emotional behaviour, and attention deficit hyperactivity disorder in 9-year-old children

The purpose of this study was to assess the relationship between noise disturbance at home, sleep disturbance, and neurodevelopmental problems in 9-year-old children. Noise exposure (frequency) perceived by 430 9-year-old children from the INMA cohort in Valencia, Spain, were reported by their mothers. The risk of developing attention deficit hyperactivity disorder, as well as internalizing and externalizing problems, were assessed using the Child Behaviour Checklist. The risk of internalizing (18%) and externalizing problems (11.7%) was higher compared to the risk of developing attention deficit hyperactivity disorder (1.4%) and were more prevalent in boys than in girls. The most common and bothersome noise exposures were generated at home (50.8-55.3%) and by neighbours (24.5%). The risk of neurodevelopmental problems was associated with sleep disturbances, particularly in relation with attention deficit hyperactivity disorder (16.1 vs 4%; p<0.001), with no differences observed between sex. Sleep disturbances were significantly more common in children exposed to noise from household or neighbours. High levels of noise exposure from street traffic and neighbours were linked to an increased risk of attention deficit hyperactivity disorder, while noise from other children at home was associated with a higher risk of internalizing and externalizing problems. These effects remained consistent even after adjusting for sleep disturbances. High levels of noise annoyance from various sources perceived at home are differently associated with the risks of different neurodevelopmental problems in 9-year-old boys and girls, with sleep disturbances not influencing this relationship.

Parental Hesitancy toward Seasonal Influenza Vaccination for Children under the Age of 18 Years and Its Determinants in the Post-Pandemic Era: A Cross-Sectional Survey among 1175 Parents in China.

Children's susceptibility to influenza increased after COVID-19 control measures were lifted. This study investigated parental hesitancy toward seasonal influenza vaccination (SIV) for children and its determinants in the post-pandemic era. An online survey of full-time adult factory workers was conducted in Shenzhen, China in December 2023. This analysis was based on 1175 parents who had at least one child under the age of 18 years. Among all parents, 37.1% were hesitant to have their index child receive SIV. Mothers exhibited lower parental hesitancy toward SIV compared to fathers (31.9% versus 41.3%, p < 0.001). After adjusting for significant background characteristics, mothers and fathers who were more satisfied with the SIV health promotion materials, perceived more severe consequences of seasonal influenza for their children, and perceived more benefits, cues to action, and self-efficacy related to their children's SIV were less likely to exhibit hesitancy toward SIV. Higher frequency of exposure to information about the increasing number of patients or severe cases due to seasonal influenza and other upper respiratory infections on social media was associated with lower parental hesitancy toward SIV among fathers but not mothers. There is a strong need to address parental hesitancy toward SIV for children in the post-pandemic era.

The relationship between youth's exposure to unhealthy digital food marketing and their dietary intake in Canada.

There is limited evidence on how exposure to digital marketing of unhealthy foods affects youth's dietary behaviours. This study therefore aimed to examine the association between youth's self-reported digital food marketing exposure and dietary intakes, and explore predictors of frequent unhealthy food consumption. A survey was conducted among 1075 youth in Canada (aged 10-17 years) in April 2023. Proportional odds models examined associations between frequency of exposure to digital marketing of unhealthy foods and frequency of consumption of those foods, adjusted for sociodemographic characteristics and digital device usage. Compared with participants reporting no exposure to digital fast-food marketing in the past week, those exposed ≥4 times per week were more likely to consume fast food more frequently. Youth exposed to digital marketing of sugary drinks and salty/savoury snacks ≥1 time(s) in the previous week were more likely to consume these foods on a greater number of days, compared with those reporting no exposure to this marketing in the past week. Reporting exposure to digital marketing of desserts/sweet treats every day or more than once a day was associated with more frequent consumption of desserts/sweet treats. Province of residence (Ontario/Quebec) and total daily time spent online predicted more frequent consumption of fast-food, sugary drinks, salty/savoury snacks and desserts/sweet treats. Overall, more frequent self-reported exposure to digital marketing of unhealthy foods is associated with more frequent consumption of these foods by Canadian youth. Regulations are needed to help protect youth from digital food marketing, which may help reduce their unhealthy food consumption.

“I was told that people might hurt me”: Experiences of religious discrimination among Jewish, Christian, and Alevi youth in Turkey

AbstractThis study investigates the experiences of young members of Alevi, Christian, and Jewish religious minorities in Turkey, a secular country with a Sunni Muslim majority. Data was collected through semi structured interviews with 29 participants aged from 17 to 24. A thematic analysis was employed to explore patterns of discrimination and exclusion in their everyday lives. The experiences of Jewish and Christian participants are characterized by ostracism, increased vulnerability to injury, and passing as a member of the majority. Alevi participants report being subjected to intense pressure to become assimilated into majority Sunni practices, as well as frequent exposure to harshly unfavourable stereotypes, and ongoing rejection of Alevi theology as a ‘true’ belief system. The discussion centres on the issue of misrecognition and, particularly, denial of identity, contextualizes the findings into broader dynamics of nation‐state politics, and focuses attention on the agency of minorities and majorities. Limitations of the study and recommendations for future research have also been presented. Please refer to the Supplementary Material section to find this article's Community and Social Impact Statement.

Chemical Substance Exposure of Some Cleaning Workers in Korea: Focusing on Inhalation Exposure

This study aimed to prevent health damage caused by chemical exposure among cleaning workers who use cleaning agents and disinfectants in facility management and kitchen areas. We analyzed 5 years of measurement data (2016–2020) for cleaning workers across various industries in Korea, and conducted an exposure survey and health risk assessment for the two most frequently measured substances (i.e., 2-butoxyethanol and sodium hydroxide) and representative substances generated by their combined use (i.e., chlorine and chloroform). The findings indicate that when chlorine was generated by mixing hypochlorite-based disinfectants (e.g., bleach) with acidic cleaners containing substances such as nitric, hydrochloric, or citric acid, the risk index for chlorine gas (based on the 95th percentile exposure values) was 5.65 in the facility management cleaning industry, exceeding the acceptable threshold of 1. Because of the high usage and exposure frequency of cleaning and disinfecting agents and the common practice of mixing multiple products to enhance cleaning efficacy, it is necessary to manage hazardous risk factors by providing education on appropriate working methods, supplying personal protective equipment, and installing ventilation systems for these workers. Further research on the health risk assessment of combined chemical use is needed.

Multiple Identities as Buffer or Catalyst? An Investigation of Psycho-Behavioral Effects of Sports Fans’ Exposure to Abusive Social Media Content

ABSTRACT Sports, traditionally pregnant with aggression and violence, are now a breeding ground for online abuse, where toxicity and malicious campaigns on social media have even afflicted national sports role models together with their huge fan base. Drawing on an online survey of 917 Chinese volleyball enthusiasts, this study investigated the psycho-behavioral outcomes of sports fans’ social media exposure to abusive messages about their idols through the lens of rejection-(dis)identification theory. Findings indicate that fans’ subjective frequency of negative social media exposure is significantly negatively associated with their sport-related well-being but has no direct connection with their offline sport engagement. The study particularly delves into the mediating roles of fans’ multiple identities, namely sport identity as a competitive mediator and national identity as a complementary mediator. Furthermore, with multi-group structural equation modeling and mediation analyses on gender sub-groups, gender differences were determined such that male fans, compared with female fans, were more likely to marshal their identity capital, which effectively enhanced their well-being and participation in sports. By linking classic theoretical propositions, this study offers a nuanced understanding of the sociopsychological consequences of online abuse in sports for ordinary social media users, contributing to both theoretical insights and practical implications.

Pandemic of sensitivity to acrylate containing nail cosmetic among young Israeli women? Result of patch testing 2-hydroxyethyl methacrylate in the European baseline series.

2-Hydroxyethyl methacrylate (HEMA) was added into the European baseline series (EBS) in 2019. There is limited data regarding the frequency, relevance, and sources of exposure to HEMA. To investigate the frequency and clinical relevance of positive reactions to HEMA in the EBS in Israel, and explore sources of exposure. Retrospective cohort study that included all patients who underwent patch testing with the EBS in a tertiary center in Israel between 2020 and 2023. Positive reactions to HEMA were stratified by sex, six age groups, and year of study. Sources of exposure to HEMA as well as occupational data were recorded. A total of 1671 consecutive patients underwent HEMA patch testing, with 135 (8.1%) showing positive reactions to HEMA (130 females, 5 males). The prevalence in women (11.0%) was significantly higher compared to men (1.0%) (p < 0.001). Stratification by age and sex revealed the highest frequency of HEMA sensitivity of 16.7% among women younger than 30 years of age, with odds ratio of 2.3 (95%CI: 1.6-3.3, p < 0.001) compared to older women. There was an increase in frequency among women between the years 2022 and 2023 when compared to 2020-2021 (OR 1.7, 95%CI: 1.5-2.1, p < 0.01) attributable to COVID-19 pandemic and social restrictions. Among men the frequency fluctuations over the study period and age categories were nonsignificant. 111 (84%) were judged to be of clinical relevance and nail cosmetics was responsible for 95% of them. Of 111 patients with relevant reaction (110 females, 1 males), 20 (18%) had occupational contact dermatitis (18 nails stylists, 2 dentists). Other culprit products included sanitary pads (n = 4), medical adhesives (n = 3), and paints (n = 2). We report the highest frequency of HEMA sensitivity to date of 8.1%, that was most common among young women and in vast majority of cases was attributable to nail cosmetics. Our findings reflect the popularity of nail cosmetics in Israel as well as the global trend of increasing sensitivity to (meth)acrylates.

Material composition and mechanical properties of the venom-injecting forcipules in centipedes

BackgroundCentipedes are terrestrial and predatory arthropods that possess an evolutionary transformed pair of appendages used for venom injection—the forcipules. Many arthropods incorporate reinforcing elements into the cuticle of their piercing or biting structures to enhance hardness, elasticity or resistance to wear and structural failure. Given their frequent exposure to high mechanical stress, we hypothesise that the cuticle of the centipede forcipule might be mechanically reinforced. With a combination of imaging, analytical techniques and mechanical testing, we explore the centipede forcipule in detail to shed light on its morphology and performance. Additionally, we compare these data to characteristics of the locomotory leg to infer evolutionary processes.ResultsWe examined sclerotization patterns using confocal laser-scanning microscopy based on autofluorescence properties of the cuticle (forcipule and leg) and elemental composition by energy-dispersive X-ray spectroscopy in representative species from all five centipede lineages. These experiments revealed gradually increasing sclerotization towards the forcipular tarsungulum and a stronger sclerotization of joints in taxa with condensed podomeres. Depending on the species, calcium, zinc or chlorine are present with a higher concentration towards the distal tarsungulum. Interestingly, these characteristics are more or less mirrored in the locomotory leg’s pretarsal claw in Epimorpha. To understand how incorporated elements affect mechanical properties, we tested resistance to structural failure, hardness (H) and Young’s modulus (E) in two representative species, one with high zinc and one with high calcium content. Both species, however, exhibit similar properties and no differences in mechanical stress the forcipule can withstand.ConclusionsOur study reveals similarities in the material composition and properties of the forcipules in centipedes. The forcipules transformed from an elongated leg-like appearance into rigid piercing structures. Our data supports their serial homology to the locomotory leg and that the forcipule’s tarsungulum is a fusion of tarsus and pretarsal claw. Calcium or zinc incorporation leads to comparable mechanical properties like in piercing structures of chelicerates and insects, but the elemental incorporation does not increase H and E in centipedes, suggesting that centipedes followed their own pathways in the evolutionary transformation of piercing tools.