Demonstration of stable, long-term operation of a nanosecond pulsed DPSSL at 10 J, 100 Hz.

We report on stable, long-term operation of a diode-pumped solid-state laser (DPSSL) amplifying 15 ns pulses at 1029.5 nm wavelength to 10 J energy at 100 Hz pulse rate, corresponding to 1 kW average power, with 25.4% optical-to-optical efficiency. The laser was operated at this level for over 45 minutes (∼3 · 105 shots) in two separate runs with a rms energy stability of 1%. The laser was also operated at 7 J, 100 Hz for 4 hours (1.44 · 106 shots) with a rms long-term energy stability of 1% and no need for user intervention. To the best of our knowledge, this is the first time that long-term reliable amplification of a kW-class high energy nanosecond pulsed DPSSL at 100 Hz has been demonstrated.

Community Priorities for Outcomes Targeted During Professional Supports for Autistic Children and their Families.

PURPOSE: Professional supports play an important role in aiding autistic children's learning, participation, and overall wellbeing. Yet, limited research exists on stakeholders' perspectives and preferences regarding targeted outcomes for children undergoing support facilitated by professionals. This study investigated stakeholder views on the priority and appropriateness of outcomes intentionally targeted during the provision of supports to autistic children. METHOD: A survey of 181 participants (including 72 autistic adults, 85 parents, and 69 professionals) from Australia and New Zealand was conducted. Participants rated the appropriateness and priority of 47 potential child and parent outcomes within the context of support. RESULTS: The highest priority outcome was improving child mental wellbeing, with the lowest being reducing sensory seeking or avoidant behaviours. Priority ratings for certain outcomes differed based on the child's age. Over half of the participants rated reducing sensory seeking/avoidant behaviours and reducing focused interests as inappropriate outcomes of supports. Further, variations in the appropriateness of outcomes differed among participant groups. CONCLUSION: Reflecting the growing acceptance of neurodiversity-affirming practices, these results underscore support for targeting outcomes that are meaningful to the autistic and autism communities, with less emphasis on those which reflect neurotypical behavioural standards.

Self-compassion improves emotion regulation and mental health outcomes: A pilot study of an online self-compassion program for autistic adults.

LAY ABSTRACT: Self-compassion is when we are aware of our feelings and thoughts, are friendly toward ourselves, and realize everyone feels pain and makes mistakes. Self-compassion is associated with having better mental health and well-being in autistic and non-autistic people. But we do not know if autistic people's self-compassion can be improved through psychoeducation and self-compassion practices. We co-produced an online self-guided self-compassion program based on evidence-based self-compassion practices for autistic adults called the Self-compassion Program for Autistic Adults. This program included live-experiences videos of autistic adults reflecting on their self-compassion and self-critical experiences. This study piloted the program with 39 autistic adults. We wanted to see if these autistic adults' self-compassion, emotion regulation, mental health, and psychological well-being improved after completing this program. We found that the autistic participants' self-compassion, emotion regulation, mental health, and psychological well-being improved significantly after completing the program over 5 weeks. We also found that just over half of the participants reported experiencing negative reactions associated with self-compassion practices. We suggested some clinical implications, including a recommendation for emotion regulation interventions to incorporate self-compassion to help promote access to the affiliative system. In addition, autistic adults who are psychologically vulnerable may need to work with mental health professionals while developing self-compassion to help manage the possible negative reactions associated with some self-compassion practices.

A qualitative exploration of an autism-specific self-compassion program: The ASPAA.

LAY ABSTRACT: Autistic people often struggle to find the right support for their mental health. We wanted to change that by trying a new approach to help autistic adults with their emotions and well-being. We focused on something called "self-compassion," which is a way of being kind and understanding toward ourselves. This approach has worked well for many people, but we didn't know if it would work for autistic individuals. We invited 39 autistic adults to join an online program that taught them about self-compassion. The program lasted 5 weeks and included educational materials, meditation exercises, and self-reflection activities. We asked the participants for feedback each week and at the end of the program. From their responses, we discovered four important things. First, self-compassion had a big positive impact on the well-being of autistic adults. Second, they faced some challenges during the program. Third, they saw self-compassion as a journey that takes time and practice. Finally, they described how they valued changes to help autistic people engage with the program. Our findings show that self-compassion can really help autistic adults. We learned about the benefits they experienced and the difficulties they faced. Most importantly, we found that personalized support is crucial for autistic individuals. By creating programs that consider their specific needs, we can improve their mental health and make their lives better.

Associations Between Rank, Sex, and Parity With Musculoskeletal Injuries Sustained During Annual Military Physical Fitness Test.

ABSTRACT: Edwards, CM, da Silva, DF, Puranda, JL, Souza, SCS, Semeniuk, K, and Adamo, KB. Associations between rank, sex, and parity with musculoskeletal injuries sustained during annual military physical fitness test. J Strength Cond Res 38(2): 367-373, 2024-Musculoskeletal injuries pose a significant threat to the well-being of military personnel. Attempts to use physical employment standard test results as predictors of injury are underway, but little is known about injuries sustained during the tests. This study sought to identify body regions most likely to be reported as injured during the annual Canadian Armed Forces (CAF) physical fitness evaluation. In addition, sex, rank, and parity status are explored as possible associated factors for injury. A total of 1,796 actively serving CAF members were categorized by sex (1,030 male participants; 766 female participants), rank (1,142 Non-Commissioned Members [NCM]; 638 Officers), and parity (314 parous female participants; 435 nulliparous female participants). Sex, rank, and parity were associated with body regions reportedly injured during an annual CAF fitness assessment (significance p ≤ 0.05). When compared with male participants, female participants were more likely to be injured {aOR: 1.797 (95% [confidence interval] CI: 1.45-2.23)} and more prone to injury of the wrist (adjusted odds ratio [aOR]: 1.933 [95% CI: 1.20-3.12]), hip (aOR: 3.445 [95% CI: 2.07-5.728]), or lower back (aOR: 1.55 [95% CI: 1.18-2.04]). Non-Commissioned Members were more likely to injure the neck (aOR: 2.14 [95% CI: 1.18-3.88]) or shoulder (aOR: 2.03 [95% CI: 1.31-3.15]), when compared with Officers. Parous female participants reported pelvis/abdomen injury at a higher rate than the nulliparous group (5 vs. 1.7%, p = 0.019). Injuries sustained during an annual CAF fitness assessment differ based on sex, rank, and parity. Canadian Armed Forces female participants, NCM, and parous female participants may require specific physical fitness support in preparation for the annual physical fitness test.

Chronic effects of stretching on range of motion with consideration of potential moderating variables: A systematic review with meta-analysis.

BACKGROUND: It is well known that stretch training can induce prolonged increases in joint range of motion (ROM). However, to date more information is needed regarding which training variables might have greater influence on improvements in flexibility. Thus, the purpose of this meta-analysis was to investigate the effects of stretch training on ROM in healthy participants by considering potential moderating variables, such as stretching technique, intensity, duration, frequency, and muscles stretched, as well as sex-specific, age-specific, and/or trained state-specific adaptations to stretch training. METHODS: We searched through PubMed, Scopus, Web of Science, and SportDiscus to find eligible studies and, finally, assessed the results from 77 studies and 186 effect sizes by applying a random-effect meta-analysis. Moreover, by applying a mixed-effect model, we performed the respective subgroup analyses. To find potential relationships between stretch duration or age and effect sizes, we performed a meta-regression. RESULTS: We found a significant overall effect, indicating that stretch training can increase ROM with a moderate effect compared to the controls (effect size = -1.002; Z = -12.074; 95% confidence interval: -1.165 to -0.840; p < 0.001; I2 = 74.97). Subgroup analysis showed a significant difference between the stretching techniques (p = 0.01) indicating that proprioceptive neuromuscular facilitation and static stretching produced greater ROM than did ballistic/dynamic stretching. Moreover, there was a significant effect between the sexes (p = 0.04), indicating that females showed higher gains in ROM compared to males. However, further moderating analysis showed no significant relation or difference. CONCLUSION: When the goal is to maximize ROM in the long term, proprioceptive neuromuscular facilitation or static stretching, rather than ballistic/dynamic stretching, should be applied. Something to consider in future research as well as sports practice is that neither volume, intensity, nor frequency of stretching were found to play a significant role in ROM yields.

Improved stability second harmonic conversion of a diode-pumped Yb:YAG laser at the 0.5 kW level.

We report on efficient and stable, type-I phase-matched second harmonic conversion of a nanosecond high-energy, diode-pumped, Yb:YAG laser. With a frequency-doubling crystal in an enclosed, temperature controller with optical windows, 0.5% energy stability was achieved for approximately half an hour. This resulted in 48.9 J pulses at 10 Hz (489 W) and a conversion efficiency of 73.8%. These results are particularly important for stable and reliable operation of high-energy, frequency-doubled lasers.

Exploring Identity Importance for Autistic Adults and Associations with Disclosure Experiences: A Brief Report.

Background: A strong autistic identity can help to support mental well-being, reduce anxiety and depression, increase self-esteem, and strengthen a shared community for autistic people. Autistic people are regularly faced with a decision to disclose their autistic identity to others and report a range of experiences after disclosure. The purpose of this brief report was to examine the association between identity and disclosure decisions in a sample of autistic adults to gather preliminary evidence justifying future research. Specifically, we were interested in learning more about how autistic identity is associated with one's approach to disclosure, while also exploring associations with other identities such as ethnic, gender, sexual, and religious identity. Methods: Participants (N = 111) completed an online questionnaire about their intersecting identities and their approach to disclosure. The research team that conducted this study was composed of both autistic and nonautistic researchers. Results: Results demonstrated that participants who felt their autistic identity and sexual identity were highly important also reported frequent disclosure of being autistic. Religious, gender, and ethnic identity were not associated with one's disclosure decisions or their disclosure outcomes. Conclusion: Overall, the results of this study emphasize the link between autistic and sexual identities and autism disclosure, but more research in this space is needed to better support the wider autism community.

Why is this an important issue?: Autistic identity is when a person feels a connection to others who are autistic, or to the larger autistic community. Disclosure, or sharing being autistic, is a complex decision that can have a significant impact on an autistic person's life. Both disclosure and autistic identity can be linked to the quality of life for many autistic adults. What was the purpose of this study?: We wanted to know whether autistic identity and disclosure were connected. We wondered whether people who felt a stronger sense of autistic identity would be more likely to share that they were autistic with other people. We also studied other identities such as religious identity, sexual identity, and gender identity­to see whether they were also connected to a person's autism disclosure decisions. What did the researchers do?: We used an online survey to ask 111 autistic adults about their identity and their autism disclosure decisions. The research team that conducted this study included both autistic and nonautistic researchers. What were the results of the study?: Autistic participants in our study who felt their autistic identity and sexual identity were highly important also told us they disclosed their autistic identity often to others in their life. Other identities, such as religious identity and ethnic identity, did not seem to relate to a person's autism disclosure in our study. What do these findings add to what was already known?: This research is the start of what we know about the connection between the identities of an autistic person and their disclosure decisions. Preliminary research like this study helps to show a reason for more research on this topic to increase knowledge and acceptance. What are potential weaknesses in the study?: This study does not cover the experiences of all autistic people, only those who could use technology to complete an online survey. Also, the design of the study only allows us to conclude that disclosure and identity are related, but we cannot yet say whether one influences the other. How will these findings help autistic adults now or in the future?: This research can help to justify additional investigations into this topic and demonstrate the importance of listening to autistic voices to understand their experiences with disclosure and how they may be influenced by their identities. For practitioners such as educators or therapists who work with autistic adults, this research can lead to knowledge that supports mental well-being.

Using Experience Sampling Methodology to Capture Disclosure Opportunities for Autistic Adults.

Background: Despite a recent surge in literature contributing to our understanding of autistic individuals' disclosure experiences, the findings remain mixed. Research based on autistic people's perspective often indicates negative outcomes, while research that focuses on nonautistic perspectives is more positive. In addition, no disclosure study has used ecologically valid research methods, which help to reduce the risk of memory biases and are more representative of real-world experiences. The aim of this research was to capture outcomes from real-world disclosure opportunities as reported by a diverse range of autistic adults. Methods: Thirty-six autistic adults reported their disclosure opportunities through experience sampling methodology (58% female, 28% male, and 14% nonbinary), multiple times per day or week for 2 months. Importantly, we embedded coproduction from conception to dissemination, ensuring that the outputs are relevant and beneficial for the autistic community. Results: In total, participants recorded 231 disclosure opportunities (M = 6.42, SD = 4.83). Two-thirds of opportunities (n = 153) were categorized as disclosure, where the participants decided to share they were autistic, and 33.8% (n = 78) were labeled nondisclosure, where the participants decided not to share that they were autistic. Qualitative thematic analysis of open responses resulted in five themes that illustrated the thought processes during disclosure opportunities, the reactions of others, and reflections following disclosure for autistic adults in our study. Conclusion: These findings show that disclosure decisions and outcomes are complex and are influenced by both internal and external factors. Both support for autistic adults navigating this process and knowledge for nonautistic individuals on the experiences of their autistic friends, family, and community members will help to alleviate negative experiences and improve the mental well-being of autistic adults who face these decisions daily.

Why is this an important issue?: Disclosure is choosing to tell someone that you are autistic. Nondisclosure is choosing not to tell someone you are autistic. This can be difficult for many people and can have a significant impact on their life. What was the purpose of this study?: We wanted to explore disclosure opportunities for autistic people. We wanted to know what these experiences looked like over 2 months and on a daily basis. What did the researchers do?: The research team asked autistic adults to complete a survey through a smartphone application every time they considered sharing that they were autistic over 2 months. The questions asked participants about their thoughts, feelings, and behaviors right after the experience. What were the results of the study?: Our participants shared 231 disclosure opportunities with us over 2 months. Some people shared no experiences, while others shared up to 19 experiences. On average, people shared six experiences. People told us how these opportunities went, and we found five common threads ("themes") across their experiences. First, when deciding whether to disclose or not, autistic people considered how safe they felt in their environment and with the people around them. Autistic people often thought about what they were hoping to gain by disclosing, and if there was nothing to gain, they decided against it. We learned that disclosure takes a lot of energy. We also learned that other people responded to disclosure in positive, neutral, and negative ways across all contexts. Finally, we found that our participants tried to learn from their experiences before the next time they thought about disclosure. What do these findings add to what was already known?: Our findings were similar to previous research that explored how complex autistic disclosure is. However, by gathering information in real time (instead of relying on recall), we learned that a decision to disclose is not only weighing up personal advantages and disadvantages, but also takes into consideration how safe the person feels in a particular environment and how much energy they feel they have at the time. We also learned that sometimes people do not disclose because they are worried about how someone might respond, but other times they simply feel there is no benefit to disclosure. What are the potential weaknesses in the study?: We understand that the experiences of our participants may not apply to all autistic people. Also, because participants had to use a computer or smartphone to be in the study, the findings may be different for individuals who were not able to participate. How will these findings help autistic adults now or in the future?: The findings help us to listen to autistic voices and learn about their experiences. We have used the results to make resource guides. This includes a guide for autistic people (including an easy English version) and a guide for nonautistic people. These resource guides can be found within the Supplementary Data, on our research website, or by getting in touch with the authorship team.Link to "a guide for autistic people" https://www.autismspectrum.org.au/uploads/documents/Research/Disclosure-opportunities-resource-guide-for-Autistic-people-Easy-English.pdf Link to "easy English version" https://www.autismspectrum.org.au/uploads/documents/Research/Disclosure-opportunities-resource-guide-for-Autistic-people_2022-12-12-005526_vgvt.pdf Link to "non-autistic people" https://www.autismspectrum.org.au/Supporting-Autistic-people-who-may-want-to-disclose.

A Single-Center Retrospective Review of Patients with Suspected Malignant Hyperthermia Susceptibility.

Purpose The diagnosis of malignant hyperthermia susceptibility (MHS) has significant implications for the perioperative period that may persist for generations. Anesthetic medication options are reduced, anesthetic workstations require preparation to reduce exposure to inhaled volatile anesthetics, and patients may be excluded from surgery at ambulatory centers. In this study, we sought to better characterize the etiology of MHS diagnoses in our health system and the downstream effects of this diagnosis on anesthetic care. Methods We retrospectively reviewed the electronic medical records of 55 patients with a documented concern for MHS who received care at University of Florida (UF) Health between 2014 and 2020. We characterized the etiology of the patient's MHS diagnosis, whether this diagnosis was supported by formal genetic or muscle contracture testing, and the details of the recorded anesthetics that were delivered to these patients. Results The 55 patients with suspected MHS were evenly split between those with a family history of malignant hyperthermia (MH) (28/55) and those with a concern for MHS in their personal medical history (27/55). Of the 28 patients with a family history of MH, 16 reported that the affected family member was a first-degree relative, and two of these 16 reported that the affected family member had undergone confirmatory muscle contracture testing. Of the 27 patients with a personal history suspicious for MHS, two had undergone confirmatory genetic testing, and two patients had anesthetic records available for review where intraoperative MH was suspected and treated with dantrolene. An additional four patients were told of a concern about MHS due to another underlying diagnosis. No patients with a personal history suspicious of MHS had undergone confirmatory muscle contracture testing. These 55 patients underwent 87 anesthetics, and exclusively non-triggering anesthetic techniques were utilized in nearly all cases. In pediatric patients, some perioperative challenges were identified, related to the avoidance of mask inhalational induction. Only six of these 87 anesthetics occurred at our ambulatory surgery centers, a proportion (6.9%) lower than that of the general surgical population at UF Health (20.0%). Conclusions Among patients suspected to be MH susceptible in our health system over a six-year period, a minority (8/55) were supported by clear records of a prior MH event, confirmatory genetic or muscle contracture testing, or an underlying diagnosis closely linked to MH. The vast majority had limited documentation supporting their MH risk but continued to be treated with non-triggering anesthetics and were less likely to have surgery at an ambulatory surgery center than our overall surgical population. Among pediatric patients, some anesthetic challenges related to delivering non-triggering anesthetics were identified. Improving the documentation of index cases of MH and increasing referrals to clinical geneticists and genetic testing may be a viable route to decreasing the proportion of suspected MHS patients with a poorly characterized risk profile.

'Most people have no idea what autism is': Unpacking autism disclosure using social media analysis.

LAY ABSTRACT: Autism disclosure - that is sharing their autism diagnosis or identity with a person or people - is a difficult decision for many autistic people. While telling people they are autistic can be positive and helpful, it can also create a lot of problems. What we have learnt is that disclosure is really complicated. Rather than asking research participants questions about what might happen, we looked at what people were saying on public social media posts (Reddit and Twitter) about what did happen. We used three years of posts that were related to autism disclosure from a wide range of adults (autistic and non-autistic). Four main ideas were created from our data, with the key finding being that society does not understand autism. This lack of understanding creates problems for autistic people in work, dating, healthcare and mental health. The remaining ideas were that autistic people should have privacy and be treated with respect, that autistic representation can help society and that non-autistic people need to do more to help autistic people. Our findings support that society needs to do more through autism advocacy, better media representation and more public role models. Increasing the accuracy of understanding of autism across society will mean that autistic people can feel safer to disclose if they want to.

Does a history of childbirth impact injury prevalence and mental health in female military members?

The effect of parity status on the prevalence and impact of musculoskeletal injury (MSKi) among female Canadian Armed Forces (CAF) members is unknown. This study aims to identify whether a history of childbirth and pregnancy-related complications are associated with MSKi occurrence among female members of the CAF. From September 2020 to February 2021, data were collected via an online questionnaire that assessed MSKi, reproductive health, and barriers to recruitment and retention in the CAF. Actively serving, female members were included in this analysis stratified by parous (n = 313) or nulliparous (n = 435) status. Descriptive analysis and binary logistic regressions were used to identify prevalence and adjusted odds ratios (aOR) of repetitive strain injuries (RSI), acute injuries, and body regions affected. Covariates included in aOR: age, body mass index, and rank. A p value of <0.05 was considered significant and 95% confidence intervals (CI) were reported. Female members with a history of childbirth were more likely to report an RSI (80.9% vs. 69.9%, OR = 1.57, CI: 1.03 to 2.40), and when stratified by body region, were more likely to have an RSI of the wrist (30.0% vs. 20.5%, aOR = 1.62, CI: 1.09 to 2.40), and foot (39.3% vs. 24.1%, aOR = 1.79, CI: 1.24 to 2.59). When compared to the nulliparous group, parity did not influence prevalence of acute injuries. MSKi and mental health perceptions were different for females who experienced postpartum depression, miscarriage, or preterm birth. Childbirth and pregnancy-related complications impact prevalence of some RSI among female CAF members. Thus, specific health and fitness support may be needed for parous female CAF members.

Quantitative ultrasound to assess efficacy of treatment for neck somatic dysfunctions: a feasibility study.

CONTEXT: Neck pain is a common complaint in healthcare clinics. Although the pathogenesis of neck pain is often multifactorial, trapezius muscle dysfunction has been commonly linked to neck pain. Osteopathic manipulative treatment (OMT) has been demonstrated to be an effective treatment modality in treating trapezius muscle dysfunction and neck pain. However, there is a current lack of objective, quantitative measures to assess the effectiveness of OMT. Through previous research, ultrasound technology has been shown to be promising in its ability to quantify tissue changes both pre- and post-OMT. OBJECTIVES: The objectives of this study are to evaluate the feasibility of shear wave elastography (SWE) in assessing upper trapezius muscles with pain and hypertonicity, as well as the changes in these muscles post-OMT for cervical somatic dysfunctions. METHODS: After obtaining approval from the Rocky Vista University Institutional Review Board and written informed consent from participants, SWE and osteopathic assessments were performed on 22 adult participants with and without cervical spine somatic dysfunction. Participants with positive osteopathic assessments of tissue texture, asymmetry, restricted motion, and/or tenderness (TART) were treated utilizing OMT. Shear wave velocity (SWV, m/s) and shear wave velocity rate [SWVR = (SWV contraction - SWV relaxation)/ SWV relaxation] of the upper trapezius muscles with and without pain and hypertonicity, and before and after OMT, were examined utilizing a two-tailed t-test. RESULTS: SWV in muscle contraction and SWVR were significantly lower in muscles with pain compared to muscles without pain (p≤0.01). SWV in muscle contraction was also significantly lower in hypertonic muscles compared to normotonic muscles (p<0.01). Following OMT, SWV in muscle contraction and SWVR in muscles with pain and hypertonic increased significantly (p≤0.01). Overall TART score of all muscles with somatic dysfunction (SD) after OMT significantly decreased (p<0.01). SWV in muscle contraction and SWVR in hypertonic muscles were also significantly increased (p≤0.03), with an improvement index of 0.11 and 0.20. CONCLUSIONS: This study's results demonstrate the feasibility of utilizing SWE to evaluate somatic dysfunctions of the upper trapezius musculature and the efficacy of OMT for neck somatic dysfunctions.

Characteristics Associated with Pelvic Floor Disorders among Female Canadian Armed Forces Members.

OBJECTIVES: Urinary incontinence (UI) and pelvic organ prolapse (POP) are prevalent pelvic floor disorders (PFDs) among the female population. In the military environment, being a non-commissioned member (NCM), and physically demanding occupations are factors associated with higher PFD risk. This study seeks to characterize the profile of female Canadian Armed Forces (CAF) members reporting symptoms of UI and/or POP. METHODS: Present CAF members (18-65 years) responded to an online survey. Only current members were included in the analysis. Symptoms of UI and POP were collected. Multivariate logistic regressions analyzed the relationships between PFD symptoms and associated characteristics. RESULTS: 765 active members responded to female-specific questions. The prevalence of self-reported POP and UI symptoms were 14.5% and 57.0%, respectively, with 10.6% of respondents reporting both. Advanced age (adjusted odds ratio [aOR]: 1.062, CI 1.038-1.087), a body mass index (BMI) categorized as obese (aOR: 1.909, [1.183-3.081]), parity ≥1 (e.g., aOR for 1: 2.420, [1.352-4.334]) and NCMs (aOR: 1.662, [1.144-2.414]) were factors associated with urine leakage. Parity of ≥2 (aOR: 2.351, [1.370-4.037]) compared to nulliparous and having a perception of a physically demanding job (aOR: 1.933, [1.186-3.148]) were associated with experiencing POP symptoms. Parity of ≥2 increased the odds of reporting both PFD symptoms (aOR: 5.709, [2.650-12.297]). CONCLUSION: Parity was associated with greater odds of experiencing symptoms of UI and POP. Higher age, higher BMI, and being an NCM were associated with more symptoms of UI, and the perception of having a physically demanding role increased the likelihood of reporting POP symptoms.

Sex disparities in self-reported musculoskeletal injuries in the Canadian Armed Forces.

Recent comprehensive systematic reviews indicate that females are at greater risk of musculoskeletal injuries (MSKi) than males in military populations. Considering the Canadian Armed Forces (CAF) goal of increasing female representation in the next few years, exploring these trends is essential. We aimed to determine the association between biological sex and MSKi in the CAF. An online survey was conducted with active-duty and former CAF members aged 18-65 years. Sex disparities in MSKi (acute or repetitive strain [RSI]) were analyzed using bivariate associations and binary logistic regressions with significance level at p < 0.05. Analyses were stratified by military environment (i.e., Army, Navy, and Air Force). From the 1947 respondents whose biological sex was reported, 855 were females and 1092 were males. Rates of RSI sustained by females and males while serving were 76.2% and 70.5% (p = 0.011), respectively, whereas 61.4% of females reported acute injuries compared to 63.7% of males (p = 0.346). Females were more likely to report overall RSI (adjusted odds ratio [aOR]: 1.397; 95% confidence intervals [CI]: 1.068-1.829), RSI having a greater impact on daily activities (aOR [95%CI]: 2.979 [2.093-4.239]) and greater impact on career progress/length (aOR [95%CI]: 1.448 [1.066-1.968]). Acute injuries, also more prevalent in females, were reported to have a greater impact on daily activities (aOR [95%CI]: 1.688 [1.198-2.379]). This study highlights sex disparities in MSKi prevalence and outcomes. Females within the CAF sample presented greater likelihood of reporting RSI, perceived impact of RSI on daily activities and career progress/length, and perceived impact of acute injuries on daily activities.

Corticospinal excitability and reflex modulation in a contralateral non-stretched muscle following unilateral stretching.

PURPOSE: Muscle stretching effect on the range of motion (ROM) and force deficit in non-stretched muscle, and the underlying mechanisms, is an ongoing issue. This study aimed to investigate crossover stretching effects and mechanisms on the plantar flexor muscles. METHODS: Fourteen recreationally active females (n = 5) and males (n = 9) performed six sets of 45-s static stretching (SS) (15-s recovery) to the point of discomfort of the dominant leg (DL) plantar flexors or control (345-s rest). Participants were tested for a single 5-s pre- and post-test maximal voluntary isometric contraction (MVIC) with each plantar flexor muscle and were tested for DL and non-DL ROM. They were tested pre- and post-test (immediate, 10-s, 30-s) for the Hoffman (H)-reflex and motor-evoked potentials (MEP) from transcranial magnetic stimulation in the contralateral, non-stretched muscle. RESULTS: Both the DL and non-DL-MVIC force had large magnitude, significant (↓10.87%, p = 0.027, pƞ2 = 0.4) and non-significant (↓9.53%, p = 0.15, pƞ2 = 0.19) decreases respectively with SS. The SS also significantly improved the DL (6.5%, p < 0.001) and non-DL (5.35%, p = 0.002) ROM. The non-DL MEP/MMax and HMax/MMax ratio did not change significantly. CONCLUSION: Prolonged static stretching improved the stretched muscle's ROM. However, the stretched limb's force was negatively affected following the stretching protocol. The ROM improvement and large magnitude force impairment (statistically non-significant) were transferred to the contralateral muscles. The lack of significant changes in spinal and corticospinal excitability confirms that the afferent excitability of the spinal motoneurons and corticospinal excitability may not play a substantial role in non-local muscle's ROM or force output responses.

Association Between Reproductive Health Factors and Musculoskeletal Injuries in Female Canadian Armed Forces Members.

Background: Musculoskeletal injuries (MSKi) play a role in member retention in the military. In general, female military members have higher rates of MSKi than males and female reproductive health characteristics may be contributing to these disparities. This study seeks to characterize reproductive health factors in female Canadian Armed Forces (CAF) members and their relationship with MSKi. Materials and Methods: An electronic survey (SurveyMonkey®) was made available to present and former CAF members 18-65 years of age. Responses were collected between September 2020 and February 2021. Seven female reproductive characteristics were assessed: age of menarche, menstrual cycle regularity, birth control use, having given birth while serving, endometriosis, early menopause, and secondary oligomenorrhea/amenorrhea. Binary logistic regressions were used to analyze associations between reproductive characteristics with repetitive strain (RSI) and acute injuries. Results: A total of 2,001 participants consented to the survey with 855 respondents being female. Females reporting menstrual cycles as never regular, irregular for a few months, who never had a period, and whose periods stopped while serving presented a greater likelihood of reporting RSI compared to their peers who reported regular menstrual cycles (adjusted odds ratio [aOR]: 1.898, confidence interval [CI]: 1.138-3.166). Participants who have experienced endometriosis presented a higher likelihood of reporting acute injuries than those who did not (aOR: 2.426, CI: 1.030-5.709). Conclusion: This examination of females within the CAF suggests that irregular menstrual cycles or absent periods increase the likelihood of experiencing MSKi, namely those categorized as RSI injuries and reporting endometriosis were associated with greater rates of acute injuries.