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Effect of External Work Magnitude on Mechanical Efficiency of Sledge Jumping

Keitaro Seki and Heikki Kyröläinen

The mechanical efficiency of human locomotion has been studied extensively. The mechanical efficiency of the whole body occasionally exceeds muscle efficiency during bouncing type gaits. It is thought to occur due to elasticity and stiffness of the tendinomuscular system and neuromuscular functions, especially stretch reflexes. In addition, the lower limb joint kinetics affect mechanical efficiency. We investigated the impact of varying external work on mechanical efficiency and lower limb kinetics during repeated sledge jumping. Fifteen male runners performed sledge jumping for 4 minutes at 3 different sledge inclinations. Lower limb kinematics, ground reaction forces, and expired gases were analyzed. Mechanical efficiency did not differ according to sledge inclination. Mechanical efficiency correlated positively with the positive mechanical work of the knee and hip joints and the negative contribution of the hip joints. Conversely, it correlated negatively with both the positive and negative contributions of the ankle joint. This may be attributable to the greater workload in this study versus previous studies. To achieve greater external work, producing more mechanical energy at the proximal joint and transferring it to the distal joint could be an effective strategy for improving mechanical efficiency because of the greater force-generating capability of distal joint muscles.

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Effect of Mindful Sport Performance Enhancement in College Athletes for Reducing Sports-Caused Anxiety and Improving Self-Awareness: A Critically Appraised Topic

Shivam Garg, Nancy A. Uriegas, Zachary K. Winkelmann, Morgan Adams, and Amy L. Fraley

Mindful Sport Performance Enhancement (MSPE) training is a relatively new concept, which focuses on helping athletes manage a variety of stressors experienced throughout a season, including performing well academically, staying fit, having a productive season in their sport, and maintaining a healthy social life. A need for a critical appraisal is needed to assess the effectiveness of the intervention. Two cohort studies and one randomized control trial were included in the study and assessed using STROBE and PEDro Scale. Key results show, all 3 studies identified participants experiencing benefits after MSPE with aspects of awareness, acceptance, and emotion regulation. Furthermore, student-athletes who attended either all the sessions or more sessions after the 6-week course showed greater satisfaction with mental and physical health. Overall, there is level “B” evidence to support effectiveness of MSPE for college athletes in reducing sport anxiety and improving their overall well-being.

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Erratum. Effect of Mindful Sport Performance Enhancement in College Athletes for Reducing Sports-Caused Anxiety and Improving Self-Awareness: A Critically Appraised Topic

International Journal of Athletic Therapy and Training

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The Prevalence of Hypohydration in School-Sponsored Athletes Across and Within Practice Sessions

Grant G. Yee, Tiffanie M. Nolte, Tyler Z. Bouchard, Courtney M. Meyer, Brendon P. McDermott, Zachery T. Richards, Stephanie A. Rosehart, and Susan W. Yeargin

Hydration status monitoring through weight charts can help active individuals maintain optimal fluid balance and prevent health/performance impairments. This study aimed to determine the prevalence of athletes above an acute hypohydration threshold (within practices), a chronic hypohydration threshold (across practices), and the prevalence of athletes below the acute hypohydration threshold and above the chronic hypohydration threshold simultaneously (e.g., undetected chronic hypohydration). Second, involvement of baseline hydration verification (BV; with/without), sex, and competition level (high school, college/university) with acute hypohydration, chronic hypohydration, and undetected chronic hypohydration were also examined. Undetected chronic hypohydration was prevalent across sexes (6.4 ± 16.7% males; 1.4 ± 5.8% females) and competition levels (6.5 ± 16.4% high school; 5.4 ± 15.6% college/university). No significant differences existed across BV status for average acute hypohydration (with BV = 0.8; without BV = 0.8) or chronic hypohydation (with BV = 0.7; without BV = 0.8). All three calculations, absolute body mass loss, acute hypohydration, and chronic hypohydration, should be utilized to determine the prevalence of hypohydration, and they should also be used to assist athletic trainers while making clinical decisions regarding appropriate rehydration interventions.

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Return to Baseball Following an Anterior Shoulder Dislocation in a High School Baseball Pitcher: A Level 3 Case Report

Maegan M. Milliet, Courtney M. Meyer, Katey Dunham, and Zachary K. Winkelmann

A 17-year-old right-handed high school pitcher sustained a first-time anterior shoulder dislocation. The patient’s imaging revealed a small Hill–Sachs lesion; however, the clinical team’s decision was to manage it nonoperatively. In this case, the patient underwent 7 weeks of rehabilitation, which included general upper extremity strengthening exercises, a modified interval throwing program, and a pitching progression adapted specifically for the patient. After rehabilitation, the patient returned to live pitching with improvements in his pitching statistics. The uniqueness of this case is that it is a less common intervention approach posttreatment.

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Sex Differences and Association Between Modified Balance Error Scoring System Error and Sway Index Scores in Collegiate, Club Sport, and High School Athletes

Ryan N. Moran and Mason Haller

The Modified Balance Error Scoring System (mBESS) remains the standard balance tool for evaluating sport-related concussion. Discrepancies between error and objective sway scoring remain a topic of assessment measures. The purpose was to examine sex differences between error and sway index scores and association between scores on the mBESS in collegiate and high school athletes. 119 athletes completed the mBESS on a Biodex BioSway. Measures consisted of mBESS errors and sway index scores produced by the BioSway. No sex differences were observed on mBESS errors and sway index scores by competition level and the overall sample. Moderate associations were observed between error and sway index scoring for single and tandem stances.

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Stress-Induced Syncope: A Case Study

Alyssa Albrecht

Four adolescent female athletes across four grades were diagnosed with either psychogenic nonepileptic seizures or conversion disorder. The females underwent thorough evaluations with their primary care providers and episode and symptom tracking by their athletic trainer. Through different applications of cognitive behavioral therapy and one-on-one counseling, the disorders resolved. Teaching athletes the importance of choosing healthy coping mechanisms to stress is vital to quality mental health. It is recommended that more research be done on psychogenic nonepileptic seizures and provide an understanding to those working with the adolescent population on triggers and treatments for psychogenic nonepileptic seizures.

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Stroboscopic Goggles Impair Postural Control in Those With and Without Chronic Ankle Instability: A Critically Appraised Topic

Serkan Uzlasir, Josh Mohess, Hyunwook Lee, Shay Rooney, and Erik A. Wikstrom

Clinical Scenario: Ankle sprains are highly common and can lead to chronic ankle instability (CAI). Individuals with CAI have a variety of sensorimotor impairments including poor postural control and altered sensory organization strategies. Visual occlusion modalities, if worn during neuromuscular control exercises, may facilitate greater postural control gains and a more appropriate sensory organization strategy. However, a cumulative review of the ability of visual occlusion modalities (e.g., stroboscopic goggles) to impair postural control and thus demonstrate the potential to facilitate greater postural gains has not yet been completed. Clinical Question: Does stroboscopic vision impair postural control in those with and without CAI, and if so, is the impairment comparable between the groups? Summary of Key Findings: Regardless of how postural control was assessed, stroboscopic vision impaired postural control relative to an eyes open (i.e., no goggles) condition. All studies demonstrated that those with and without CAI were impacted equally. Stroboscopic vision resulted in postural control impairments comparable to an eyes closed in some but not all studies. Clinical Bottom Line: Stroboscopic vision impairs postural control in both those with CAI and uninjured controls. Strength of Recommendation: There is moderate-quality evidence (Grade B) that stroboscopic vision impairs postural control in those with CAI and uninjured controls.

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Erratum. Recommendations for Implementation of Dog Therapy Intervention in the Athletic Training Facility

International Journal of Athletic Therapy and Training

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Evaluating the Impact of Seated Pilates on Functional Outcomes Among Those With Mild, Moderate, and Severe Multiple Sclerosis Impairment: A Pilot Feasibility Trial

Brynn Adamson, Keston G. Lindsay, Layla Almasri, Meghann Koppele Duffy, Stacy Kirkpatrick, and Manuel E. Hernandez

This pilot study assessed the feasibility and functional benefits of a twice-weekly, 12-week, virtual, seated, group-based Pilates program in persons with mild to severe multiple sclerosis (MS). Participants were randomized into either a Pilates-only group or a Pilates group, which also incorporated hip and shoulder-cuff activation exercises. Process, management, and scientific-feasibility metrics were analyzed descriptively. Functional outcomes, physical activity, and MS-related outcomes (impact, fatigue, and quality of life) were measured pre- and postintervention and analyzed using mixed-effects models, analysis of variance, and cluster analysis. Twenty-two participants completed baseline testing. Sixteen completed the intervention and postintervention testing. Collapsed across groups, analyses demonstrated improvements in the Timed 25-Foot Walk (36%), Timed Up-and-Go (13%), and the Berg Balance Scale (10%, statistically significant). Neither between-groups differences nor physical activity or MS outcome changes were significant. Participants reported high satisfaction. Findings suggest that virtual, seated Pilates is feasible and may confer balance benefits to individuals with MS.