J.D. DeFreese

ORCID: 0000-0003-3233-0699
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About
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Research Areas
  • Traumatic Brain Injury Research
  • Sports injuries and prevention
  • Cardiovascular Effects of Exercise
  • Sport Psychology and Performance
  • Motivation and Self-Concept in Sports
  • Cardiac Arrest and Resuscitation
  • Resilience and Mental Health
  • Sports Performance and Training
  • Shoulder Injury and Treatment
  • Athletic Training and Education
  • Knee injuries and reconstruction techniques
  • Healthcare professionals’ stress and burnout
  • Traumatic Brain Injury and Neurovascular Disturbances
  • Youth Development and Social Support
  • Nursing Roles and Practices
  • Posttraumatic Stress Disorder Research
  • Diverse Approaches in Healthcare and Education Studies
  • Musculoskeletal pain and rehabilitation
  • Suicide and Self-Harm Studies
  • Obesity, Physical Activity, Diet
  • Cardiovascular and exercise physiology
  • Physical Activity and Health
  • Health, Environment, Cognitive Aging
  • Psychosomatic Disorders and Their Treatments
  • Eating Disorders and Behaviors

University of North Carolina at Chapel Hill
2016-2025

Datalys Center for Sports Injury Research and Prevention
2022

Center for Health, Exercise and Sport Sciences
2021

University of North Carolina Health Care
2021

University of South Carolina
2014

Purdue University West Lafayette
2012-2013

Social support and negative social interactions have implications for athlete psychological health, with potential to influence the links of stress-related experiences burnout well-being over time. Using a longitudinal design, perceived were examined as moderators temporal stress–burnout burnout–well-being relationships. American collegiate athletes ( N = 465) completed reliable valid online assessments study variables at four time points during competitive season. After controlling...

10.1123/jsep.2014-0040 article EN Journal of Sport and Exercise Psychology 2014-12-01

10.24985/ijass.2015.27.2.63 article EN IJASS(International Journal of Applied Sports Sciences) 2015-12-01

Background: There is a dearth of research on the current health former collegiate athletes. Purpose: To examine and related correlates in cohort athletes who played diverse range men’s women’s sports with various levels contact. Study Design: Cross-sectional study; Level evidence, 3. Methods: Former (N = 3657) were asked to complete an online questionnaire addressing history, medical demographics. The also included Veterans RAND 12-Item Health Survey (VR-12), which yielded 2 composite scores...

10.1177/2325967114544107 article EN cc-by-nc-nd Orthopaedic Journal of Sports Medicine 2014-08-01

There is need for a youth-informed conceptualization of how environmental and social neighborhood contexts influence physical activity. We assessed youths' perceptions their peer environments as affecting Thirty-three students (20 girls; ages 12-14 years) participated in focus groups about the environment peers within neighborhoods, understanding they affect Inductive analysis identified themes access (e.g., to equipment); aesthetics; safety; proximity behavior bullying); adult support or...

10.1186/s12966-015-0246-9 article EN cc-by International Journal of Behavioral Nutrition and Physical Activity 2015-06-19

Objectives To examine the relationships among self-reported sport-related concussion (SRC) history and current health-promoting behaviours (exercise frequency, diet quality sleep duration) with measures of brain health (cognitive function, symptoms depression anxiety emotional–behavioural dyscontrol) in former NFL players. Methods In this cross-sectional study, a questionnaire was sent to Respondents reported SRC (categorical: 0; 1–2; 3–5; 6–9; 10+ concussions), number moderate-to-vigorous...

10.1136/bjsports-2020-103400 article EN British Journal of Sports Medicine 2021-01-04

Background Despite evidence suggesting perceived stress negatively impacts post-concussion outcomes and that mindfulness may improve relationship, research has not investigated those connections.

10.1080/02699052.2025.2455463 article EN Brain Injury 2025-01-22

The global athlete burnout–engagement relationship was investigated using the areas of worklife and relevant conceptual antecedents. Participants were 227 collegiate football players who completed an online survey assessing study variables. Athlete scores on measure fit data as expected. Two contrasting mediational models that incorporated antecedent to burnout engagement, respectively, exhibited similar fit. However, Akaike information criterion (AIC) values other model estimates indicated...

10.1080/10413200.2012.705414 article EN Journal of Applied Sport Psychology 2013-02-19

Context: The female athlete triad (Triad) and relative energy deficiency in sport (RED-S) specify the consequences of imbalance. Athletic trainers (ATs) are positioned to identify athletes who fueling themselves inadequately experiencing related health performance consequences. Objective: To assess knowledge collegiate ATs about Triad RED-S examine variability screening referral behaviors among National Collegiate Association divisions. Design: Cross-sectional study. Setting: athletic...

10.4085/1062-6050-52.11.29 article EN Journal of Athletic Training 2017-12-18

Burnout is an important psychological health concern for working professionals. Understanding how stress and markers of workload contribute to athletic trainers' (ATs') perceptions burnout highly valuable. Both positive (social support) negative social interactions should be considered when examining relationships among ATs' wellbeing.To examine the potential effects on between (1) perceived (2) incongruence in ATs.Cross-sectional study.Participating ATs completed a computer-based survey...

10.4085/1062-6050-51.2.05 article EN Journal of Athletic Training 2016-01-01

Background: Despite a focus on the incidence and effects of concussion, nondisclosure sports-related concussions among retired players from National Football League (NFL) has yet to be examined. Purpose: Examine prevalence factors associated with in former NFL athletes. Study Design: Cross-sectional study; Level evidence, 3. Methods: A sample 829 completed general health survey. This historical cohort included who had played before World War II 2001. Respondents retrospectively recalled that...

10.1177/0363546517728264 article EN The American Journal of Sports Medicine 2017-09-25

To identify subgroups of former National Football League (NFL) players using latent profile analysis (LPA) and examine their associations with total years participation (TYP) self-reported lifetime sport-related concussion history (SR-CHx).Former NFL (N=686) aged 50-70 years, an average 18.0 TYP (±4.5) completed a questionnaire. SR-CHx distributions included: low (0-3; n=221); intermediate (4-8; n=209) high (9+; n=256). LPA measures Quality Life in Neurological Disorders Emotional-Behavioral...

10.1136/jnnp-2020-324244 article EN Journal of Neurology Neurosurgery & Psychiatry 2021-01-22

ABSTRACT Purpose This study aimed to estimate prevalence of mild cognitive impairment (MCI) and dementia diagnoses in former National Football League (NFL) players ≥50 yr old examine the relationships among these an array predictors long-term brain health. Methods A cross section NFL ( n = 922; mean ± SD age, 64.8 8.9 yr) completed a questionnaire. Prevalence self-reported medical MCI was reported alongside U.S. population estimates across 5-yr age intervals (e.g., 60–64 yr). ratios (PR)...

10.1249/mss.0000000000002802 article EN Medicine & Science in Sports & Exercise 2021-09-30

Context Individuals with lower extremity osteoarthritis (OA) have a 25% greater risk of cardiovascular disease (CVD) than those without OA. The prevalence traumatic joint injuries among National Football League (NFL) players exposes these athletes to an elevated for OA and potentially factors (CRFs) CVD. Objectives To examine the associations between history injury, OA, CRFs CVD former NFL athletes. Design Cross-sectional study. Patients or Other Participants Former completed comprehensive...

10.4085/1062-6050-0437.22 article EN Journal of Athletic Training 2023-01-16

Over the past decade, there has been significant debate regarding effect of cumulative subconcussive head impacts on short and long-term neurological impairment. This remains unresolved, because valid epidemiological estimates athletes' total contact exposure are lacking. We present a measure to estimate hours in football over majority an athlete's lifespan. Through structured oral interview, former players provided information related primary position played participation games practice...

10.1089/neu.2014.3666 article EN Journal of Neurotrauma 2015-01-20

Sport coaches can play an important role in shaping a team's approach to concussion safety through their communication with team members. However, across all sports, there is limited knowledge about factors that make more or less likely engage safety-supportive communication. The objectives of this study were assess the concussion-related and attitudes wrestling coaches, as well extent which they autonomy-supportive coaching practices, determine how these are related athletes support safety....

10.1080/10410236.2016.1196417 article EN Health Communication 2016-07-27

This study examined associations among athlete perceptions of the coach-athlete relationship and psychological outcomes burnout engagement across a competitive season. We hypothesized that higher levels three markers (closeness, commitment, complementarity) would be negatively associated with positively sport American female collegiate rowers (N = 37; Mage 19.3 years, SD 1.18) completed online self-report assessments variables at four seasonal survey waves. Multilevel linear modeling...

10.1123/jcsp.2018-0010 article EN Journal of Clinical Sport Psychology 2018-09-28

Objective This study investigated the longitudinal course of depressive symptom severity over 19 years in former American football players and influence concussion history, contact sport participation physical function on observed trajectories. Methods Former completed a general health questionnaire involving demographic information, medical/psychiatric concussion/football history validated measures depression at three time points (2001, 2010 2019). Parallel process latent growth curve...

10.1136/jnnp-2021-326602 article EN Journal of Neurology Neurosurgery & Psychiatry 2021-10-18

Years of sport participation (YoP) is conventionally used to estimate cumulative repetitive head impacts (RHI) experienced by contact athletes. The relationship this measure other estimates impact exposure and the potential associations these measures with neurobehavioral functioning are unknown. We investigated association between YoP Head Impact Exposure Estimate (HIEE), whether two varied.Former American football players (N = 58; age 37.9 ± 1.5 years) completed in-person evaluations...

10.1017/s1355617721000047 article EN Journal of the International Neuropsychological Society 2021-02-10
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