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.

BackgroundMusculoskeletal 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.MethodsCross-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.ResultsForty-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.ConclusionsMSCI 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.

Objective: The study describes and analyses the influence of a comprehensive intervention on premature discharges (i.e. the military training cannot be completed). Participants: 862 male soldiers from three military units were included. Methods: The intervention included a screening protocol with a questionnaire and physical tests for musculoskeletal complaints or injuries and functional limitations and, where needed, treatment, early rehabilitation and individually-adjusted physical training. The intervention also included organisation-based training in ergonomics and exercise physiology for officers plus enhanced teamwork between officers and physiotherapist. Not all the soldiers underwent the intervention as planned. Results: The discharge rate was lower in all three units after either of the intervention programmes comparing premature discharge figures with before-implementation study figures. However, significantly fewer soldiers were discharged from the group who underwent the intervention as planned 6.1% compared to the group with the less intensive intervention, 13.1% (p=0.002). Conclusions: The results indicate that the comprehensive intervention programme can reduce the number of premature discharges from the Swedish Armed Forces. The differences between the groups indicate that the effectiveness was greater when the intervention was fully implemented with regard to intensity.