Background: Inconsistent associations have been reported for impact-related ground reaction force variables and running injuries when grouping all together. However, previous work has shown more consistent focusing on specific injuries. Purpose: To compare between healthy injured runners as a group within common Study Design: Controlled laboratory study. Methods: A total of 125 presenting with patellofemoral pain, tibial bone stress injury, plantar fasciitis, Achilles tendinopathy, or...

ABSTRACT The degree to which standard laboratory gait assessments accurately reflect impact loading in an outdoor running environment is currently unknown. Purpose To compare tibial shock between treadmill and road marathon conditions. Methods One hundred ninety-two runners (men/women, 105/87; age, 44.9 ± 10.8 yr) completed a assessment while wearing tibial-mounted inertial measurement unit, several days before completing race. Participants ran at 90% of their projected race speed 30 s data...

Despite the health benefits of running, prevalence running-related injuries (RRI) remains high. The underlying risk factors between these are still not well understood. Therefore, aim this study was to compare biomechanical, anthropometric, and demographic injury different locations in injured recreational runners.In retrospective case-control analysis, 550 runners (49.6% female) with a medically diagnosed RRI were included. All had undergone an instrumented treadmill analysis determine...

Shock attenuation may be a clinically feasible method to assess changes in lower extremity joint loading induced by gait modifications, such as decreasing foot strike angle (forefoot striking). The purpose of this study was identify shock between habitual and forefoot conditions. Eighteen participants ran on treadmill with their an instructed gait. measured inertial measurement units the ratio proximal distal peak resultant/vertical accelerations, three sensor combinations: ankle below/above...

Musculoskeletal injuries (MSI) are an important concern in military populations. The purpose of this study was to describe the burden MSI and associated financial cost, a sample US Air Force Special Operations Command Tactics Operators.In cross-sectional study, medical records Operators were reviewed during years 2014-2015. that occurred 1-year period prior date review described. attributes described included incidence, anatomic location, cause, activity when occurred, type lifetime cost...

The purpose of this study was to identify and compare energy requirements specific Special Operations Forces in field training, both cool hot environments. Three separate training sessions were evaluated, 2 a environment (n = 21) 1 8). Total expenditure calculated using doubly labeled water. Dietary intake assessed via self-report at the end each mission day, macronutrient intakes calculated. Across 3 missions, mean (4618 ± 1350 kcal/day) exceeded (2429 838 by an average 2200 kcal/day....

Musculoskeletal injury rates in military personnel remain unacceptably high. Application of machine learning algorithms could be useful multivariate models to predict this population. The purpose study was investigate if interaction between individual predictors, using a decision tree model, used develop population-specific algorithm lower-extremity (LEI) risk.One hundred forty Air Force Special Forces Operators (27.4 ± 5.0 yr, 177.6 5.8 cm, 83.8 8.4 kg) volunteered for prospective cohort...

After a concussion, athletes may be at increased risk of musculoskeletal injuries. Altered perception action boundaries (ABP), or the limits one's capabilities, is one possible mechanism for this increase in injury after concussion.To evaluate differences symptoms, neurocognitive, vestibular/oculomotor, and boundary function between subjects with no concussion history (NoHx) (ConcHX).Cross-sectional study.Laboratory University Pittsburgh.ConcHx (n = 22; age: 21.8 ± 3.0 years, height: 174.0...

Inertial measurement units (IMUs) attached to the distal tibia are a validated method of measuring lower-extremity impact accelerations, called tibial accelerations (TAs), in runners. However, no studies have investigated effects small errors IMU placement, which would be expected real-world, autonomous use IMUs. The purpose this study was evaluate effect proximal shift location on mean TAs and relationships between ground reaction force loading rates. IMUs were strapped 18 injury-free...

Ankle injury is one of the most common conditions in athletics and military activities. Strength asymmetry (SA) imbalance may represent a risk factor for injury, but past investigations have produced ambiguous conclusions. Perhaps explanation this ambiguity fact that these authors used univariate models to predict injury.To evaluate predictive utility SA calculations ankle multivariate prediction models.Prospective cohort study.Laboratory.A total 140 male US Air Force Special Forces.Baseline...

Abstract Johnson, CD, Whitehead, PN, Pletcher, ER, Faherty, MS, Lovalekar, MT, Eagle, SR, and Keenan, KA. The relationship of core strength activation performance on three functional movement screens. J Strength Cond Res 32(4): 1166–1173, 2018—Current measures stability used by clinicians researchers suffer from several shortcomings. Three screens appear, at face-value, to be dependent the ability activate control musculature. These 3 may present a viable alternative current stability....

BACKGROUND: The perception-action coupling task (PACT) was designed as a more ecologically valid measure of alertness/reaction times compared to currently used measures by aerospace researchers. purpose this study assess the reliability, within-subject variability, and systematic bias associated with PACT. METHODS: There were 16 subjects (men/women = 9 / 7; age 27.8 ± 3.6 yr) who completed 4 identical testing sessions. PACT requires make judgements on whether virtual ball could fit into an...

Abstract Background Patellofemoral pain (PFP) is among the most common injuries in runners. While multiple risk factors for patellofemoral have been investigated, interactions of variables contributing to this condition not explored. This study aimed classify runners with using a combination including biomechanical, anthropometric, and demographic through Classification Regression Tree analysis. Results Thirty-eight PFP 38 healthy controls (CON) were selected mean (standard deviation) age 33...

Abstract Nagle, EF, Sanders, ME, Gibbs, BB, Franklin, BA, JA, Prins, PJ, Johnson, CD, and Robertson, RJ. Reliability accuracy of a standardized shallow water running test to determine cardiorespiratory fitness. J Strength Cond Res 31(6): 1669–1677, 2017—A fitness assessment is critical for the development an individualized exercise prescription. Although benefits aquatic have been well established, there remains need nonswimming protocol accurately assess (CRF) in water. The present...

While some studies have found strong correlations between peak tibial accelerations (TAs) and early stance ground reaction forces (GRFs) during running, others reported inconsistent results. One potential explanation for this is the lack of a standard orientation sensors used to collect TAs. Therefore, our aim was test effects an established sensor reorientation method on Tas their with GRFs. Twenty-eight runners had TA GRF data collected while they ran at self-selected speed instrumented...