| 1. |
- Bohman, Tony, et al.
(author)
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Concurrent validity of an isokinetic lift test used for admission to the Swedish Armed Forces
- 2018
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In: PLOS ONE. - : Public Library of Science. - 1932-6203. ; 13:11
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Journal article (peer-reviewed)abstract
- The aim of this study was to assess the concurrent validity of the IsoKai isokinetic lift test peak force (IsoKai(Peak))1 in comparison to a submaximal 5-1ORM deadlift test (5-10RM(DL)), and to develop an equation for converting the IsoKai(Peak) in Newton (N) to an estimated 1 RM (1 RMest) deadlift load in kilograms (kg). The participants included 28 males and 16 female employees in the Swedish Armed Forces (20-59 years). Each participant conducted the IsoKai lift test, followed by the 5-1ORM(DL) test at one occasion. The Pearson's correlation coefficient, with a 95% confidence interval was calculated to evaluate the validity between the IsoKai(peak) and the 1 RMest deadlift load derived from the 5-10RM(DL) test. Univariate and multivariable linear regressions were used to derive the equation for calculating the 1 RMest deadlift load based on the IsoKai(Peak)- The IsoKai(p)(eak) showed good- to-excellent correlation with the 1 RMest deadlift weight with a correlation coefficient of 0.84 (0.72-0.91) for the total sample, and 0.65 (0.37-0.83) and 0.81 (0.53-0.93) in males and females, respectively. The final equation, 1 RMest deadlift weight (kg) = -51.63 + (0.08 x IsoKai(Peak))1+ (2.28 x BMI), explained 72% (adjusted R-2 = 0.72) of the total variance in the 1 RMest, and had a standard error of the estimate (SEE) of 16.57 kg. In conclusion, the IsoKai isokinetic lift test could be considered a highly valid measure of maximal dynamic muscular strength in comparison to the 5-10RM(DL). The equation can be used to convert the IsoKai lift test (N) results to an 1 RMest deadlift load (kg), but with consideration of the relative large SEE.
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| 2. |
- Bohman, Tony, et al.
(author)
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Reliability and agreement of the IsoKai isokinetic lift test - A test used for admission to the Swedish Armed Forces
- 2018
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In: PLOS ONE. - : Public Library Science. - 1932-6203. ; 13:12
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Journal article (peer-reviewed)abstract
- This study was performed to evaluate the reliability and agreement of the IsoKai isokinetic lift test as it is currently administered in admission to the Swedish Armed Forces. The study included an intrarater (n = 534) and interrater reliability sample (n = 137), of Swedish male conscripts who performed the test on two test occasions about two hours apart. Two-to-four lifts were performed at each occasion, and the highest mean (IsoKai(MF)) and peak force (IsoKai(PF)) produced (N) were used for evaluation. All intraclass coefficients showed excellent reliability. The interrater analyses resulted in intraclass coefficients of 0.942 (95% CI; 0.920-0.959) and 0.858 (95% CI; 0.806-0.896) for the IsoKai(MF) and IsoKai(PF), respectively, while the corresponding coefficients for the intrarater analyses were 0.935 (95% CI; 0.923-0.946) and 0.865 (95% CI; 0.842-0.886). Agreement, the capability of a test to detect changes, was assessed by the standard error of measurement (SEM/SEM%) and the smallest real difference (SRD/SRD%). These estimate indicated that it is possible to achieve measurements relevant to use in real practice with the IsoKai isokinetic lift test. Bland and Altman analyses revealed no systematic errors in either sample. Based on these findings, the IsoKai isokinetic lift test is suggested to be a highly reliable test for maximal dynamic muscular strength. The test could be of use in selection procedures in order to accurately evaluate maximal dynamic muscular strength, and for evaluating longitudinal changes in strength.
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| 3. |
- Halvarsson, Alexandra, et al.
(author)
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Remarkable increase of musculoskeletal disorders among soldiers preparing for international missions - comparison between 2002 and 2012
- 2019
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In: BMC Musculoskeletal Disorders. - : Springer Science and Business Media LLC. - 1471-2474. ; 20:1
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Journal article (peer-reviewed)abstract
- Background:Musculoskeletal disorders (MSD) are common among soldiers and constitute the most common reason for discontinuing military service within different military populations worldwide. The aims of this study were to investigate the prevalence of musculoskeletal disorders in two cohorts, 10 years apart, in the Swedish Armed Forces, to explore differences between these cohorts and to determine associated factors with MSD.Method: Comparative cross-sectional study. Participants were recruited from the Swedish Armed Forces, i.e. soldiers preparing for international missions in 2002 and 2012. A total of 961 soldiers, 7% women, participated in the study.Data were collected using the Musculoskeletal Screening Protocol (MSP), which includes questions regarding prevalence of MSD in ten anatomical locations (neck, upper back, low back, shoulders, elbow, hand, hip, knee, lower limb and foot). An additional five questions concern perceived self-rated health, i.e. how the respondent perceives their own physical body, mental health, social environment, physical environment and work ability.Results: Over a ten-year period, both point prevalence and one-year prevalence of MSD in any body part increased significantly, with point prevalence increasing from 7.1 to 35.2% (p < 0.001) and one-year prevalence from 27.9 to 67.9% (p < 0.001). The knee was the most common anatomic location for MSD in both cohorts. Across each anatomical location (neck, upper back, low back, shoulders, elbow, hand, hip, knee, lower leg and foot), both point prevalence (p < 0.039) and one-year prevalence (p < 0.005) increased significantly from 2002 to 2012.Most soldiers reported good to excellent perceived health, i.e. self-perception of their physical body, mental health, physical and social environments, and work ability.The odds of reporting one-year prevalence of MSD in any body part was 5.28 times higher for soldiers in Cohort 2012, 1.91 times higher in age group 31–40 and 2.84 times higher in age group 41 and above.Conclusions: The prevalence of MSD increased remarkably over a ten-year period among Swedish soldiers preparing for international missions. With increasing age as one risk factor, systematic monitoring of MSD throughout the soldiers’ careers and implementation of targeted primary-to-tertiary preventive programs are thus important.
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| 4. |
- Halvarsson, Alexandra, et al.
(author)
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Self-reported musculoskeletal complaints and injuries and exposure of physical workload in Swedish soldiers serving in Afghanistan
- 2018
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In: PLOS ONE. - : Public library science. - 1932-6203. ; 13:4
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Journal article (peer-reviewed)abstract
- Background: Musculoskeletal complaints and injuries (MSCI) are common in military populations. However, only a limited number of studies have followed soldiers during international deployments and investigated the prevalence of MSCI during and at the end of their deployment. The aim was to describe the prevalence of MSCI in different military occupational specialties and categorise their most common tasks in terms of exposures to physical workloads during a six-month long international deployment in Afghanistan. Methods: Cross-sectional survey, including 325 soldiers (300 men), aged 20-62 participating in an international deployment in Afghanistan during the spring of 2012. Soldiers were clustered into different military occupational specialties: Infantry, Administration, Logistics, Logistics/Camp, Medical and Other. Data were collected through the use of the Musculoskeletal Screening Protocol at the end of the international mission. Results: Forty-seven percent reported MSCI during deployment, with 28% at the end. The most common locations of MSCI during the mission were lower back, knee, shoulders, upper back, neck and foot, while the knee and lower back prevailed at the end of the mission. Almost half of the soldiers who had MSCI reported affected work ability. The most common duties during the mission were vehicle patrolling, staff duties, guard/security duties, foot patrols and transportation. Soldiers reported that vehicle patrolling, staff duties and transportation were demanding with respect to endurance strength, guard/security duties challenged both maximum and endurance strength while foot patrolling challenged maximum and endurance strength, aerobic and anaerobic endurance and speed. Conclusions: MSCI during international deployment are common among Swedish soldiers. The results indicate the need to further develop strategies focusing on matching the soldiers' capacity to the job requirements, with relevant and fair physical selection-tests during the recruitment process and proactive interventions targeting MSCI before and during deployment, in order to enhance soldiers' readiness and promote operational readiness.
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| 5. |
- Kierkegaard, Marie, et al.
(author)
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High physical exposure during female recruits’ basic military training in Sweden : a descriptive study
- 2024
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In: Military medicine. - : Oxford University Press. - 0026-4075 .- 1930-613X. ; 189:3-4, s. E674-E682
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Journal article (peer-reviewed)abstract
- Introduction: There is a knowledge gap concerning the occurrence of physical complaints/injuries, i.e., musculoskeletal disorders (MSD), among Swedish women who undergo basic military training (BMT). The aims were to describe prevalence and factors related to MSD and explore physical exposure and performance in Swedish female recruits during BMT.Materials and Methods: A total of 144 females (mean age 22 years) who underwent BMT in 2016 participated in this cross-sectional study. Data regarding self-reported MSD, physical performance, physical activity and exercise, motivation and mental and physical preparation, and physical exposure during BMT and perceived health were collected at the end of BMT through the Musculoskeletal Screening Protocol questionnaire. Additional data on muscle strength were retrieved from IsoKai isokinetic lift tests. Descriptive and analytic (paired samples t-test and logistic binary regression) statistics were used.Results: The prevalence of MSD was high, with 33% (n = 48) reporting MSD before BMT, 78% (n = 113) during, and 50% (n = 72) at the end of BMT. Knee and upper back were the most frequently reported MSD locations. Forty-four (30%) participants felt insufficiently physically prepared for BMT. The physical exposure was high with loaded marches/runs and carrying heavy loads as the most demanding tasks. The longest walking distance was reportedly 55 km, and the reported maximum load was 50 kg. Forty-five participants (31%) had carried a load representing over 50% of their body weight. Most participants reported good to excellent health at the end of BMT. There was a small (8 N) but significant (P = 0.045) increase in mean force over time. Two variables, MSD before BMT (odds ratio 2.24, P = 0.03) and being physically unprepared (odds ratio 3.03, P < 0.01), were associated with MSD at the end of BMT.Conclusion: This study showed that the prevalence of MSD in Swedish female recruits was high before, during, and at the end of BMT, with knee and upper back as the most frequent locations. Although the physical exposure during BMT was occasionally high, self-rated health was mainly perceived as good to excellent at the end of BMT. Previous MSD and being physically unprepared were related to MSD at the end of BMT. These important and relevant findings indicate the necessity for implementing interventions to increase physical fitness and treat MSD at the beginning of BMT.
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| 6. |
- Kierkegaard, Marie, et al.
(author)
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Test-Retest Reliability and Translation of the Musculoskeletal Screening Protocol Questionnaire Used in the Swedish Armed Forces
- 2023
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In: Military medicine. - : Oxford University Press. - 0026-4075 .- 1930-613X. ; 188:7-8
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Journal article (peer-reviewed)abstract
- INTRODUCTION: Musculoskeletal disorders (MSDs) in military personnel are common, and it is important to identify those at risk so that appropriate preventive and rehabilitative strategies can be undertaken. The Musculoskeletal Screening Protocol (MSP) questionnaire is part of the implemented prevention strategy to reduce MSDs in the Swedish Armed Forces. The aims of this study were to evaluate the questionnaire's reliability and to translate it into English.MATERIALS AND METHODS: One-week test-retest reliability of the questionnaire was evaluated in a sample of 35 Swedish military personnel. Reliability was evaluated by calculations of Cohen's kappa or quadratic-weighted kappa. Percent agreement was used as a parameter for measurement error. Translation into English included forward and backward translations and expert committee discussions.RESULTS: Kappa values relating to physical complaints/injuries were excellent (>0.75) except for knee and lower leg MSDs and for the intensity ratings, where Kappa values were mostly interpreted as fair-to-good (0.4-0.75). Kappa values of items pertaining physical performance, physical activity and exercise, eating and tobacco habits, sleep, and perceived health ranged between 0.72 and 1. Kappa values for feeling mentally or physical prepared were 0.47 and 0.65, respectively. Most percentage agreement values ranged between 90% and 100%. The English version was found to be satisfactorily equivalent to the Swedish MSP questionnaire.CONCLUSION: The Swedish MSP questionnaire was found to be highly reliable and was satisfactorily translated into English. This provides support for the questionnaire's ability to trustworthily capture the prevalence of MSDs and perceived health in military personnel. Future research is warranted on the psychometric properties of the English MSP questionnaire.
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| 7. |
- Larsson, Helena, et al.
(author)
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Content Validity Index and Intra- and Inter-Rater Reliability of a New Muscle Strength/Endurance Test Battery for Swedish Soldiers
- 2015
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In: PLOS ONE. - : Public library science. - 1932-6203. ; 10:7
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Journal article (peer-reviewed)abstract
- The objective of this study was to examine the content validity of commonly used muscle performance tests in military personnel and to investigate the reliability of a proposed test battery. For the content validity investigation, thirty selected tests were those described in the literature and/or commonly used in the Nordic and North Atlantic Treaty Organization (NATO) countries. Nine selected experts rated, on a four-point Likert scale, the relevance of these tests in relation to five different work tasks: lifting, carrying equipment on the body or in the hands, climbing, and digging. Thereafter, a content validity index (CVI) was calculated for each work task. The result showed excellent CVI (>= 0.78) for sixteen tests, which comprised of one or more of the military work tasks. Three of the tests; the functional lower-limb loading test (the Ranger test), dead-lift with kettlebells, and back extension, showed excellent content validity for four of the work tasks. For the development of a new muscle strength/endurance test battery, these three tests were further supplemented with two other tests, namely, the chins and side-bridge test. The inter-rater reliability was high (intraclass correlation coefficient, ICC2,1 0.99) for all five tests. The intra-rater reliability was good to high (ICC3,1 0.82-0.96) with an acceptable standard error of mean (SEM), except for the side-bridge test (SEM%>15). Thus, the final suggested test battery for a valid and reliable evaluation of soldiers' muscle performance comprised the following four tests; the Ranger test, dead-lift with kettlebells, chins, and back extension test. The criterion-related validity of the test battery should be further evaluated for soldiers exposed to varying physical workload.
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| 8. |
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| 9. |
- Tegern, Matthias, et al.
(author)
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A prospective cohort study on risk factors for cervico-thoracic pain in military aircrew
- 2023
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In: Aerospace Medicine and Human Performance. - : Aerospace Medical Association. - 2375-6314 .- 2375-6322. ; 94:7, s. 500-507
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Journal article (peer-reviewed)abstract
- Background: Military aircrew frequently report cervico-thoracic pain and injury. The relationship between risk factors and future pain episodes is, however, uncertain. The aim of this study was to identify risk factors for cervico-thoracic pain and to determine the 1-yr cumulative incidence of such pain.Methods: A total of 47 Swedish aircrew (fighter and helicopter pilots and rear crew) without pain in the cervico-thoracic region were surveyed about work-related and personal factors and pain prevalence using the Musculoskeletal Screening Protocol questionnaire. They also performed tests of movement control, active cervical range of motion, and isometric neck muscle strength and endurance. Aircrew were followed for a year with questionnaires. Logistic regressions were used to identify potential risk factors for future cervico-thoracic pain.Results: Previous cervico-thoracic pain (OR: 22.39, CI: 1.79-280.63), lower cervical flexion range of motion (OR: 0.78, CI: 0.64-0.96), and lower neck flexor muscular endurance (OR: 0.91, CI: 0.83-0.99) were identified as risk factors for reporting cervico-thoracic pain. At follow-up, 23.4% (CI: 13.6-37.2) had reported cervico-thoracic pain during the 12-mo follow-up period.Discussion: The Musculoskeletal Screening Protocol can identify risk factors for cervico-thoracic pain. The link between cervico-thoracic pain and previous pain, as well as lower performance of neck range of motion and muscular endurance, highlights the need for primary and secondary preventive action. The findings from this study can facilitate the development of such pain prevention programs for aircrew.
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| 10. |
- Tegern, Matthias, et al.
(author)
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Cervico-thoracic pain and associated impairments in air force personnel : a cross-sectional study
- 2021
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In: BMC Musculoskeletal Disorders. - : BioMed Central. - 1471-2474. ; 22:1
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Journal article (peer-reviewed)abstract
- Background: Pain and impaired function in the cervical region are common in Air Force personnel (AFP), but evidence is limited regarding the thoracic region. This cross-sectional cohort study examined associations between cervico-thoracic pain and physical performance among Swedish AFP and explored possible differences and similarities in test performance between fighter pilots (FP), helicopter pilots (HP) and rear crew (RC).Methods: AFP (n = 73) from one airbase performed eight tests of movement control of the spine, active cervical range of motion (ROM) in all six directions and isometric strength and endurance of the cervical flexors and extensors. The association between test performance and cervico-thoracic pain (based on the ‘Musculoskeletal screening protocol’ questionnaire) were analysed in a multiple binary logistic regression model.Results: For AFP with cervico-thoracic pain (30%), movement control was impaired in the ‘neck flexion test’ (OR [95%CI] =3.61 [1.06–12.34]) and the ‘forward lean test’ (OR [95%CI] =3.43[1.04–11.37]), together with reduced flexion ROM (OR [95%CI] =0.93 [0.87–0.99]). Test performance was in general similar between the three groups, but FP and HP could control the ‘forward lean test’ to a significantly higher degree than RC (p = 0.000). Further, FP showed significantly greater ROM in lateral flexion to the right compared to HP and RC (mean: 40.3°, 36.2° and 33.4°, respectively, p = 0.000), and they showed higher, although not significant, flexor strength than RC (p = 0.026).Conclusions: The impaired function associated with cervico-thoracic pain highlights the need for a deeper understanding of such relationships when designing tools to systematically optimize the physical performance and prevent pain among AFP. Studies with a longitudinal design are warranted to examine any causative associations between pain and impairments.
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| 11. |
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| 12. |
- Tegern, Matthias, et al.
(author)
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Inter-rater and test-retest reliability of movement control tests for the neck, shoulder, thoracic, lumbar, and hip regions in military personnel
- 2018
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In: PLOS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 13:9
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Journal article (peer-reviewed)abstract
- Strategies are needed to mitigate the high rates and related risks of musculoskeletal complaints and injuries (MSCI) in the military aviator community. Previous work on Swedish Armed Forces (SwAF) soldiers have shown that proper screening methods have been successful in reducing early discharge from military training. Research has pointed at the importance of optimal spinal movement control in military aviators. The aim of this work was to investigate the inter-rater and test-retest reliability of a battery of clinical tests for evaluating movement control in the neck, shoulders, thoracic, lumbar, and hip regions in a population of SwAF military personnel. Inter-rater and test-retest reliability of 15 movement control tests were assessed by crude and prevalence-adjusted kappa coefficient. The study included 37 (inter-rater) and 45 (test-retest) SwAF personnel and was performed with two physiotherapists simultaneously observing and rating the movements on the first occasion and repeated with one physiotherapist on the second occasion. For inter-rater reliability, the kappa coefficient ranged from .19 to .95. Seven tests showed substantial to almost perfect agreement (kappa > .60). With the adjusted kappa, three more tests reached the level of substantial agreement. The corresponding values for test-retest reliability ranged from .26 to .65. Substantial agreement was attained for two tests, three with adjusted kappa. The following tests can reliably be used when screening for biomechanically less advantageous movement patters in military aviators: Shoulder flexion, and rotation, Neck flexion in sitting and supine, Neck extension and rotation in sitting, Pelvic tilt, Forward lean and Single and Double knee extension tests. Grading criteria for tests in supine and quadruped positions need to be further elaborated.
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| 13. |
- Tegern, Matthias, et al.
(author)
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Musculoskeletal disorders and their associations with health- and work-related factors : a cross-sectional comparison between Swedish air force personnel and army soldiers
- 2020
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In: BMC Musculoskeletal Disorders. - : Springer Science and Business Media LLC. - 1471-2474. ; 21:1
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Journal article (peer-reviewed)abstract
- BACKGROUND: The high numbers of musculoskeletal disorders (MSD) among soldiers in the Swedish Armed Forces has led to the implementation of an effective prevention program, the musculoskeletal screening protocol (MSP), including questionnaires, physical tests and individual intervention of their MSD. A corresponding MSP for the Swedish Air Force is also needed due to earlier reported high prevalence of MSD. We therefore investigated the prevalence of MSD in Swedish Air Force personnel (AF) and compared this to Swedish Army deployed soldiers (DS). Individual, health- and work-related factors associated with MSD were also investigated.METHODS: Cross-sectional questionnaire-based study on 166 male AF and 185 DS. AF consisted of fighter pilots, helicopter pilots and rear crew from one Swedish air base.RESULTS: The one-year and point prevalence, respectively, of MSD were significantly higher for AF compared to DS with regard to both the upper quarter of the body (i.e. neck, shoulder and thoracic regions) (AF = 54.8 and 31.3%, DS = 26.1 and 13.6%, p = 0.01) and the lumbar region (AF = 38.0 and 18.7%, DS = 22.2 and 7.1%, p = 0.00). No significant differences were present between fighter pilots, helicopter pilots and rear crew regarding MSD prevalence. Factors significantly associated with having both upper quarter and lumbar regions MSD were group (i.e. greater odds for AF than DS) and self-reported physical health as less than excellent. Additionally, being older and taller were also factors associated with lumbar region MSD.DISCUSSION: Despite a generally healthy lifestyle, MSD were commonly reported by AF and DS, with generally higher prevalence in AF who mainly reported MSD in the upper quarter of the body. The results from this study indicate that the MSP can be a meaningful tool to prevent MSD in air force personnel and that questions regarding general health and MSD in specific body regions should be included in screening protocols. The development of the preventive program MSP is therefore recommended for the Swedish Air Force.
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| 14. |
- Tegern, Matthias, 1982-
(author)
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Musculoskeletal disorders in Swedish military aircrew : screening and clinical examination of the cervico-thoracic region
- 2021
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Doctoral thesis (other academic/artistic)abstract
- Musculoskeletal disorders (MSD) are a common and growing occupational problem in military aircrew. Intervention studies attempting to reduce such issues have only showed limited preventive effects. Furthermore, in-depth knowledge of the clinical presentation of aircrew members with painful episodes is lacking. This thesis was conducted to add evidence to the ongoing work of the Swedish Armed Forces (SAF) for the prevention of MSD. The overall aim of this thesis was to estimate the occurrence of MSD in general and specifically cervico-thoracic pain and its associated factors among SAF aircrew and to evaluate clinically relevant tests, prior to the adaptation of a musculoskeletal screening protocol (MSP) for use in the SAF medical health care system. All participants included in the four studies of this thesis were employed in the SAF. Two cross-sectional studies (Study I; n=351, Study III; n=73) aimed to establish the occurrence of MSD in aircrew compared with army deployed soldiers (Study I) and between fighter pilots, helicopter pilots and rear crew (Study I), as well as identify associated factors of cervical, thoracic and shoulder region pain (Study I) and cervico-thoracic pain (Study III). Study II had a test-retest design and aimed to examine inter-rater (n=37) and test-retest (n=45) reliability of movement control tests. In study III, test performance was compared between fighter pilots, helicopter pilots and rear crew. Study IV had a cross-sectional (n=18) and a prospective observational cohort (n=47) design and aimed to explore physical symptoms and functional limitations in aircrew with cervico-thoracic pain, establish 12-month cumulative incidence and to identify risk factors for cervico-thoracic pain.The main findings of this thesis were that when compared to deployed soldiers, military aircrew reported higher prevalence of MSD in the cervical, thoracic, shoulder, and lumbar regions (80% reported at least one painful area during the previous year). Working as aircrew, and a lower rating of one’s physical health, were significantly associated with pain in the cervical, thoracic and shoulder regions (Study I). Two physical therapists could reliably rate movement patterns for the majority of movement control tests in the affected areas. Lower reliability was however seen for test-retest conditions (Study II). Movement control and measures of cervical range of motion (ROM), but not cervical strength and endurance, were associated with cervico-thoracic pain among military aircrew. Specifically, less control of both neck and lumbar flexion movements, and lesser cervical flexion ROM were associated with cervico-thoracic pain. Differences were found between fighter pilots, helicopter pilots and rear crew for lumbar flexion movement control and cervical lateral flexion ROM (Study III). Physical symptoms and functional impairments of aircrew with high (pain) intensity, flight-elicited and work-affecting cervico-thoracic pain showed an individual presentation. Previous pain episodes, lesser cervical flexion ROM, and lesser cervical flexor muscle endurance were identified as risk factors for future cervico-thoracic pain, which had a 12-month cumulative incidence of 23% (Study IV).Findings from this thesis strongly indicate that MSD in SAF aircrew is an occupational problem that need to be solved. The cervico-thoracic region was especially common in SAF aircrew. Movement control can reliably be assessed, but with less stability for repeated measures. While pain history and physical performance can to some degree be used to identify aircrew at risk for further cervico-thoracic pain, the clinical presentation of their physical symptoms showed individual presentation. The effects of implementing the MSP in the SAF as a primary and secondary preventive intervention, as well as rehabilitative strategies, need be systematically evaluated.
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