Clinical measures associated with dynamic balance and functional movement.

Decreased balance and impaired functional movement have been linked with increased injury risk. The purpose of our study was to determine the association between specific measures of power, strength, flexibility, balance, and endurance compared with more global measures of dynamic balance, using the Y-Balance Test (YBT), and functional movement, using the functional movement screen (FMS), in healthy soldiers. Our participants (n = 64; 53 men, 11 women) were healthy active duty service members (25.2 ± 3.8 years, 25.1 ± 3.1 kg·m(-2)). Seventeen tests with 38 associated measures of strength, power, flexibility, endurance, balance, and functional measures were assessed. A significant Pearson product moment correlation (r > 0.2 and p < 0.01) was used to narrow the number of variables of interest. Two hierarchical stepwise regression analyses were performed to determine the most parsimonious set of variables associated with the YBT and FMS performance scores. Our results included a 4 variable model (F = 13.4, p < 0.001) that was associated with YBT scores (R = 0.72, R2 = 0.51). Superior performance on the YBT was associated with better performance on the FMS lunge and upper trunk mobility tests, decreased number of hops during a 6-m hop test, and greater gastrocnemius flexibility. A second 4 variable model (F = 11.813, p < 0.001) was associated with FMS scores (R = 0.70, R2 = 0.50). Superior performance on the FMS was associated with greater anterior reach on the YBT, greater distance on the crossover hop test, increased hamstring flexibility, and higher levels of self-reported function through the lower-extremity functional scale. Physical fitness leaders and clinicians could use these models to inform decision making when developing and assessing the outcomes of a personalized intervention program for those with low FMS and YBT scores.

Prevalence of Musculoskeletal Injuries in a Security Force Assistance Brigade Before, During, and After Deployment.

INTRODUCTION: The Security Force Assistance Brigades (SFABs) are specialized units designed to strengthen allied and partnered nations through advising, supporting, liaising, and assessing in support of U.S. national security interests and combatant commanders' war fighting objectives. As the 1st SFAB was the pioneer unit, descriptive analysis of the musculoskeletal injures and body regions occurring before, during, and after deployment was previously unavailable, limiting the ability of embedded holistic health and fitness teams to proactively address the unit's musculoskeletal needs and medical readiness. MATERIALS AND METHODS: Physical therapists collected and retrospectively analyzed data from 4597 encounters over 19 months: 4 months before, 9 months during, and 4 months after deployment using descriptive statistics. RESULTS: Physical therapy encounters averaged 124 per month during pre-deployment preparation, 363 per month during deployment, and 206 per month post-deployment. The most common musculoskeletal injuries identified during pre-deployment were to the lumbar spine (31.8%), knee (18.1%), and shoulder (9.1%). The most common areas of injury during deployment were to the lumbar spine (28.4%), thoracic spine (18.3%), and shoulder (14.0%). The most common post-deployment injuries consulted were to the lumbar spine (21.3), shoulder (19.6%), and knee (17.8%). CONCLUSION: Musculoskeletal injuries are a concern that may limit medical readiness in the SFABs in the time of before, during, and after deployment. Low back pain is the primary musculoskeletal injury of the 1st SFAB throughout the entire deployment cycle. Based on these findings, recommendations include embedding injury prevention programs to address low back pain to improve medical readiness. More research is required to assess the effectiveness of these programs in reducing incidents of musculoskeletal injuries before, during, and after deployment cycles.

Y-balance test: a reliability study involving multiple raters.

The Y-balance test (YBT) is one of the few field expedient tests that have shown predictive validity for injury risk in an athletic population. However, analysis of the YBT in a heterogeneous population of active adults (e.g., military, specific occupations) involving multiple raters with limited experience in a mass screening setting is lacking. The primary purpose of this study was to determine interrater test-retest reliability of the YBT in a military setting using multiple raters. Sixty-four service members (53 males, 11 females) actively conducting military training volunteered to participate. Interrater test-retest reliability of the maximal reach had intraclass correlation coefficients (2,1) of 0.80 to 0.85 with a standard error of measurement ranging from 3.1 to 4.2 cm for the 3 reach directions (anterior, posteromedial, and posterolateral). Interrater test-retest reliability of the average reach of 3 trails had an intraclass correlation coefficients (2,3) range of 0.85 to 0.93 with an associated standard error of measurement ranging from 2.0 to 3.5cm. The YBT showed good interrater test-retest reliability with an acceptable level of measurement error among multiple raters screening active duty service members. In addition, 31.3% (n = 20 of 64) of participants exhibited an anterior reach asymmetry of >4cm, suggesting impaired balance symmetry and potentially increased risk for injury.