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Military Medicine Jun 2024Several challenges face the U.S. Marine Corps (USMC) and other services in their efforts to design recruit training to augment warfighter mobility and resilience in both...
Unsupervised Machine Learning in Countermovement Jump and Isometric Mid-Thigh Pull Performance Produces Distinct Combat and Physical Fitness Clusters in Male and Female U.S. Marine Corps Recruits.
INTRODUCTION
Several challenges face the U.S. Marine Corps (USMC) and other services in their efforts to design recruit training to augment warfighter mobility and resilience in both male and female recruits as part of an integrated model. Strength and power underpin many of the physical competencies required to meet the occupational demands one might face in military. As the military considers adopting force plate technology to assess indices of strength and power, an opportunity presents itself for the use of machine learning on large datasets to deduce the relevance of variables related to performance and injury risk. The primary aim of this study was to determine whether cluster analysis on baseline strength and power data derived from countermovement jump (CMJ) and isometric mid-thigh pull (IMTP) adequately partitions men and women entering recruit training into distinct performance clusters. The secondary aim of this study is then to assess the between-cluster frequencies of musculoskeletal injury (MSKI).
MATERIALS AND METHODS
Five hundred and sixty-five males (n = 386) and females (n = 179) at the Marine Corps Recruit Depots located at Parris Island and San Diego were enrolled in the study. Recruits performed CMJ and IMTP tests at the onset of training. Injury data were collected via medical chart review. Combat fitness test (CFT) and physical fitness test (PFT) results were provided to the study team by the USMC. A k-means cluster analysis was performed on CMJ relative peak power, IMTP relative peak force, and dynamic strength index. Independent sample t-tests and Cohen's d effect sizes assessed between-cluster differences in CFT and PFT performance. Differences in cumulative incidence of lower extremity %MSKIs were analyzed using Fisher's exact test. Relative risk and 95% confidence intervals (CIs) were also calculated.
RESULTS
The overall effects of cluster designation on CMJ and IMTP outcomes ranged from moderate (relative peak power: d = -0.68, 95% CI, -0.85 to -0.51) to large (relative peak force: d = -1.69, 95% CI, -1.88 to -1.49; dynamic strength index: d = 1.20, 95% CI, 1.02-1.38), indicating acceptable k-means cluster partitioning. Independent sample t-tests revealed that both men and women in cluster 2 (C2) significantly outperformed those in cluster 1 (C1) in all events of the CFT and PFT (P < .05). The overall and within-gender effect of cluster designation on both CFT and PFT performance ranged from small (d > 0.2) to moderate (d > 0.5). Men in C2, the high-performing cluster, demonstrated a significantly lower incidence of ankle MSKI (P = .04, RR = 0.2, 95% CI, 0.1-1.0). No other between-cluster differences in MSKI were statistically significant.
CONCLUSIONS
Our results indicate that strength and power metrics derived from force plate tests effectively partition USMC male and female recruits into distinct performance clusters with relevance to tactical and physical fitness using k-means clustering. These data support the potential for expanded use of force plates in assessing readiness in a cohort of men and women entering USMC recruit training. The ability to pre-emptively identify high and low performers in the CFT and PFT can aid in leadership developing frameworks for tailoring training to enhance combat and physical fitness with benchmark values of strength and power.
Topics: Humans; Female; Male; Military Personnel; Physical Fitness; Adult; Unsupervised Machine Learning; Cluster Analysis; Muscle Strength; Exercise Test; United States; Adolescent; Thigh
PubMed: 38920035
DOI: 10.1093/milmed/usad371 -
Military Medicine Jun 2024Injury epidemiology research with military populations typically utilizes data obtained through medical chart review (MCR) or injury self-reports (ISRs). MCR data will...
INTRODUCTION
Injury epidemiology research with military populations typically utilizes data obtained through medical chart review (MCR) or injury self-reports (ISRs). MCR data will not capture musculoskeletal injury (MSKI) data for which medical care was not sought, which is common during military recruit training. Injury self-report is affected by issues with recall, especially for MSKIs perceived as less severe. U.S. Marine Corps (USMC) recruits participate in an intense 13-week recruit training program during which they are susceptible to MSKIs. The purpose of the current analysis was to utilize a novel statistical method, the capture-recapture (CRC) technique, to account for the undercounting inherent in MSKI data sources and estimate the ascertainment-corrected cumulative incidence of MSKIs during USMC recruit training.
MATERIALS AND METHODS
Data for the current study were derived from a larger study, the USMC Gender-Integrated Recruit Training Study, which was initiated to provide data-driven recommendations to increase gender integration in USMC recruit training. The estimated cumulative incidence of MSKIs during 13-weeks of USMC recruit training was calculated from the 2 sources of MSKI data (MCR, ISR) and using CRC analysis. Medical charts were reviewed to extract data about MSKIs that occurred during recruit training. Self-reported MSKI data for the same period were obtained from recruits at the end of recruit training. MSKIs were classified according to their anatomical location and type. The Chapman modification of the Lincoln-Peterson estimator was utilized to conduct the CRC analysis.
RESULTS
Medical chart review and ISR MSKI data were available for 464 USMC recruits (age: 19.1 ± 1.9 years; gender: men 70.0%). The observed 13-week cumulative incidence of MSKI in the sample was 21.8% in the MCR and 28.4% in the ISR, while the CRC incidence was much higher (62.0%). The MCR and ISR ascertainment were 35.1% and 45.9%, respectively, while the overall ascertainment or completeness of MSKI data when 2 sources were used was moderate (65.0%). When stratified by MSKI anatomical location, the overall ascertainment varied by anatomical location of the MSKI. It was highest for lower extremity MSKIs (64.8%), but lower for upper extremity (38.9%) and spine (33.3%) MSKIs. The overall ascertainment also varied by MSKI type; it was highest for sprain (55.1%), followed by strain (54.8%), and the pain/spasm/ache (43.3%).
CONCLUSIONS
This was the first study to utilize the CRC technique to access the ascertainment-corrected incidence of MSKIs among USMC recruits. There was significant undercounting in both sources of the data analyzed, and the extent of undercounting varied by both MSKI anatomical location and type. When 2 sources of data were utilized simultaneously, the percent of CRC-estimated MSKIs observed from 2 sources of data was more complete. There is a need for further application of the CRC technique to MSKI data in military populations to provide a more complete assessment of MSKIs. Identification of modifiable factors that influence completeness of MSKI data obtained during military recruit training is also warranted.
Topics: Humans; Military Personnel; Incidence; Male; Female; United States; Musculoskeletal System; Adult; Musculoskeletal Diseases; Young Adult; Self Report
PubMed: 38920034
DOI: 10.1093/milmed/usae129 -
Aging and Disease Jun 2024Aging is a multifactorial process that ultimately leads to a decline in physiological function and a consequent reduction in the health span, and quality of life in... (Review)
Review
Aging is a multifactorial process that ultimately leads to a decline in physiological function and a consequent reduction in the health span, and quality of life in elderly population. In musculoskeletal diseases, aging is often associated with a gradual loss of skeletal muscle mass and strength, resulting in reduced functional capacity and an increased risk of chronic metabolic diseases, leading to impaired function and increased mortality. Autophagy is a highly conserved physiological process by which cells, under the regulation of autophagy-related genes, degrade their own organelles and large molecules by lysosomal degradation. This process is unique to eukaryotic cells and is a strict regulator of homeostasis, the maintenance of energy and substance balance. Autophagy plays an important role in a wide range of physiological and pathological processes such as cell homeostasis, aging, immunity, tumorigenesis and neurodegenerative diseases. On the one hand, under mild stress conditions, autophagy mediates the restoration of homeostasis and proliferation, reduction of the rate of aging and delay of the aging process. On the other hand, under more intense stress conditions, an inadequate suppression of autophagy can lead to cellular aging. Conversely, autophagy activity decreases during aging. Due to the interrelationship between aging and autophagy, limited literature exists on this topic. Therefore, the objective of this review is to summarize the current concepts on aging and autophagy in the musculoskeletal system. The aim is to better understand the mechanisms of age-related changes in bone, joint and muscle, as well as the interaction relationship between autophagy and aging. Its goal is to provide a comprehensive perspective for the improvement of diseases of the musculoskeletal system.
PubMed: 38913046
DOI: 10.14336/AD.2024.0362 -
The Indian Journal of Radiology &... Jul 2024Hydroxyapatite crystal deposition disease (HADD) is a common disorder resulting from the deposition of calcium hydroxyapatite crystals in various soft tissues, typically...
Hydroxyapatite crystal deposition disease (HADD) is a common disorder resulting from the deposition of calcium hydroxyapatite crystals in various soft tissues, typically in periarticular distribution, including tendons, tendon sheaths, joint capsules, ligaments, bursae, periarticular soft tissues, and occasionally within the joints. The more commonly known subtypes of HADD are calcific tendinopathy and calcific periarthritis. Carpal tunnel syndrome (CTS) can be rarely caused by calcific deposits within the carpal tunnel in the setting of HADD-related calcific periarthritis. Imaging, particularly ultrasound and radiographs, is crucial in distinguishing this entity from the conventional form of CTS that tends to be idiopathic. We describe a rare presentation of CTS secondary to calcific periarthritis in a 45-year-old patient, with imaging demonstrating mass-like calcification within the carpal tunnel, with typical features of those seen with HADD. The patient was treated with ultrasound-guided barbotage, with significant clinical improvement. The case highlights a lesser-known cause of CTS as well as a presentation of HADD, and the role of ultrasound-guided barbotage, a minimally invasive procedure, as a viable first-line management option as an alternative to surgery.
PubMed: 38912254
DOI: 10.1055/s-0043-1778650 -
Hong Kong Journal of Occupational... Jun 2024Wearable sensors are increasingly applied to rehabilitation for arm movement analysis. However, simple and clinically relevant applications are scarce.
INTRODUCTION
Wearable sensors are increasingly applied to rehabilitation for arm movement analysis. However, simple and clinically relevant applications are scarce.
OBJECTIVES
To investigate the feasibility of single smart watch-based parameters for functional assessment in upper limb rehabilitation for musculoskeletal injuries using a commercial smart watch.
METHOD
Ten patients with unilateral shoulder pain and range-of-motion limitations were enrolled. They wore Galaxy Watch and performed three sets of upper extremity tasks consisting of gross activities-of-daily-living tasks, Wolf Motor Function Test (WMFT), and Upper Extremity Functional Index (UEFI), and the acceleration and angular velocities were acquired. The motion segment size (MSS), representing motion smoothness from a clinical perspective, and various sensor-based parameters were extracted. The correlation between the parameters and clinical outcome measures were analyzed. The percent relative range (PRR) of the significant parameters was also calculated.
RESULTS
For overhead and behind body activity task set, mean MSS for elbow flexion/extension axis significantly correlated with WMFT score (R = 0.784, = .012). For planar tasks, mean MSS for the forearm supination/pronation (R = 0.815, = .007) and shoulder rotation (R = 0.870, = .002) axes significantly correlated with WMFT score. For forearm and fine movement task set, mean MSS of the elbow flexion/extension angle showed significant correlation with WMFT (R = 0.880, < .001) and UEFI (R = 0.718, = .019). The total performance time (R = -0.741, = .014) also showed significant correlation with WMFT score. The PRR for mean MSS in forearm supination (71.5%, planar tasks) and mean MSS in -direction (49.8%, forearm and fine motor movements) were similar to the PRR of WMFT (58.5%), suggesting sufficient variation range across different degree of impairments.
CONCLUSION
The commercial smart watch-based parameters showed consistent potential for use in clinical functional assessments.
PubMed: 38912103
DOI: 10.1177/15691861241241775 -
Revista Brasileira de Ortopedia Jun 2024To investigate the epidemiology of injury types among jiu-jitsu practitioners, as well as the incidence regarding different skill and experience levels, through the...
To investigate the epidemiology of injury types among jiu-jitsu practitioners, as well as the incidence regarding different skill and experience levels, through the question: "What are the characteristics and prevalence of musculoskeletal injuries in Jiu-Jitsu practitioners?". Since the beginning of the study, in August 2020, we conducted a search on the MEDLINE, LILACS, and SciELO electronic databases. We included cross-sectional studies published between 2018 and 2023 on the epidemiology of the types of injuries among jiu-jitsu practitioners that compared their incidence regarding different levels of ability and experience. Two independent researchers performed the data extraction and assessed the risk of bias. Seven studies were included. The common outcomes involved 2,847 jiu-jitsu practitioners. A high prevalence in the knee joint and chest and rib areas was reported. Considering the difference in experience level among the practitioners, we could observe that most of the individuals included were beginners. Among the age groups observed, male practitioners older than 30 years of age were the ones who presented the highest rate of musculoskeletal injury, especially during training sessions. There is a high prevalence of musculoskeletal injuries among jiu-jitsu practitioners. The most affected anatomical segments are the knee joint, the chest, and the rib region, followed by the shoulder joint. The related factors change according to certain variables, being more common during training in male individuals over 30 years of age and beginners in the sport.
PubMed: 38911890
DOI: 10.1055/s-0044-1785662 -
TheScientificWorldJournal 2024Exercise is beneficial for improving general health, wellbeing, and specific medical conditions. In musculoskeletal conditions such as chronic low back and neck pain,...
INTRODUCTION
Exercise is beneficial for improving general health, wellbeing, and specific medical conditions. In musculoskeletal conditions such as chronic low back and neck pain, prescribed exercise has been found to be moderately effective in decreasing pain and improving function. Osteopaths are primary contact health professionals who manage predominantly musculoskeletal complaints. This work presents a secondary data analysis of the Australian osteopathy practice-based research network and profiles the characteristics of osteopaths who often use exercise prescription in patient care. . Secondary analysis of a cross-sectional survey of 992 osteopaths was registered with the Osteopathy Research and Innovation Network, an Australian practice-based research network. Demographics, practice, and treatment characteristics of Australian osteopaths who "often" use exercise prescription in patient care were examined.
RESULTS
Seven-hundred and thirty-three Australian osteopaths (74%) indicated that they use exercise prescription "often" in patient care. Australian osteopaths who often use exercise prescription are more likely to be colocated with another osteopath (ORa 1.54) and send referrals to an exercise physiologist (ORa 1.94) and a specialist medical practitioner (ORa 1.72). Those osteopaths who often used exercise prescription were also more likely to discuss physical activity (ORa 5.61) and nutrition (ORa 1.90). Australian osteopaths who use exercise prescription often were more likely to treat patients with sports injuries (ORa 2.43) and use soft tissue techniques (ORa 1.92), trigger point techniques (ORa 2.72), and sports taping (ORa 1.78).
CONCLUSION
Osteopaths who utilise exercise prescription were more likely to discuss physical activity, diet, and nutrition and utilise referral networks with specialist medical practitioners and exercise physiologists. Australian osteopaths who often use exercise prescriptions were also more likely to treat patients with sport injury. The results suggest that most Australian osteopaths use exercise prescription and have referral networks with other health professionals for patient management. Further work is required to explore the type of exercise prescription used and for what conditions.
Topics: Humans; Australia; Female; Male; Adult; Middle Aged; Cross-Sectional Studies; Exercise Therapy; Exercise; Osteopathic Medicine; Practice Patterns, Physicians'; Osteopathic Physicians; Prescriptions
PubMed: 38911694
DOI: 10.1155/2024/1977684 -
Annals of Translational Medicine Jun 2024
PubMed: 38911558
DOI: 10.21037/atm-24-10 -
The Lancet Regional Health. Western... Jun 2024The Australian population aged 70 and above is increasing and imposing new challenges for policy makers and providers to deliver accessible, appropriate and affordable...
Pre-COVID life expectancy, mortality, and burden of diseases for adults 70 years and older in Australia: a systematic analysis for the Global Burden of Disease 2019 Study.
BACKGROUND
The Australian population aged 70 and above is increasing and imposing new challenges for policy makers and providers to deliver accessible, appropriate and affordable health care. We examine pre-COVID patterns of health loss between 1990 and 2019 to inform policies and practices.
METHODS
Using the standardised methodology framework and analytical strategies from GBD 2019 methodologies, we estimated mortality, causes of death, years of life lost (YLLs), years lived with disability (YLDs), disability-adjusted life years (DALYs), life expectancy at age 70 and above (LE-70), and healthy life expectancy (HALE-70) in Australia comparing them globally and with high socio-demographic index (SDI) groups.
FINDINGS
DALY rates have been improving steadily over the past 30 years among Australians aged 70 and above. Decreases in DALY rates were primarily attributed to a fall in YLLs attributable to cardiovascular diseases (60%) and chronic respiratory disorders (30.2%) and transport injuries (56.9%), while the non-fatal burden remained stable from 1990 to 2019. According to the DALY rates, the top five leading causes are ischemic heart disease, Alzheimer's disease, COPD, stroke, and falls, where falls exhibited the largest increase since 1990.
INTERPRETATION
This study provides an in-depth report on the main causes of mortality and disability in Australia's population aged 70 and above. It sheds light on the shifts in burden over three decades, emphasising the need for the Australian health system to enhance its readiness in addressing the escalating demands of an ageing population. These findings establish pre-COVID baseline estimates for Australia's population aged 70 and above, informing healthcare preparedness.
FUNDING
Bill & Melinda Gates Foundation.
PubMed: 38911261
DOI: 10.1016/j.lanwpc.2024.101092 -
Orthopaedic Journal of Sports Medicine Jun 2024While prevention protocols have been implemented, skiing-related musculoskeletal injuries and concussions continue to present to emergency departments in the United...
BACKGROUND
While prevention protocols have been implemented, skiing-related musculoskeletal injuries and concussions continue to present to emergency departments in the United States. Previous literature has suggested the pediatric population may constitute up to 40% of skiing-related injuries.
PURPOSE
To assess injury trends and the underlying mechanisms of skiing injuries in pediatric patients seen at emergency departments in the United States.
STUDY DESIGN
Descriptive epidemiology study.
METHODS
The National Electronic Injury Surveillance System (NEISS) was queried for pediatric (age ≤18 years) skiing injuries between January 1, 2012, and December 31, 2022. Injury mechanism, location, disposition, and diagnosis were recorded, and the statistical sample weight assigned by NEISS by hospital was used to calculate national estimates (NEs). Injury trends were evaluated with linear regression analysis.
RESULTS
Overall, 2951 pediatric skiing injuries were included (NE = 123,386). The mean age of the patients was 12.4 ± 3.5 years, with 61.3% of the injuries occurring in male patients. Impact with the ground was the most common injury mechanism (NE = 87,407; 70.8%). Fractures were the most common diagnosis (NE = 38,527, 31.2%), followed by strains/sprains (NE = 22,562, 18.3%), contusions/abrasions (NE = 16,257, 13.2%), and concussions (NE = 12,449, 10.1%). The lower leg was the most common fracture site (NE = 9509, 24.7%), followed by the shoulder (NE = 7131, 18.5%) and lower arm (NE = 5876, 15.3%). Analysis of annual injuries revealed no significant trend between 2012 and 2022 ( = .17), with fluctuations apparent throughout the study period. Significant decreases were seen in strains/sprains ( < .01) and contusions/abrasions ( < .01), but not in concussions ( = .57) or fractures ( = .70).
CONCLUSION
Impacts with the snow/ground made up 70.8% of all injuries. Fractures were the most common injury diagnosis, followed by strains/sprains, with the lower leg being most frequently fractured. While strains/sprains and contusions/abrasions showed a significant decline, there were no significant trends in fractures and concussions between 2012 and 2022.
PubMed: 38911123
DOI: 10.1177/23259671241255704