Timothy J. Walker

ORCID: 0000-0003-3171-5431
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About
Contact & Profiles
Research Areas
  • Physical Activity and Health
  • Health Policy Implementation Science
  • Obesity, Physical Activity, Diet
  • Community Health and Development
  • Children's Physical and Motor Development
  • Motivation and Self-Concept in Sports
  • Workplace Health and Well-being
  • Behavioral Health and Interventions
  • Health Sciences Research and Education
  • Photochemistry and Electron Transfer Studies
  • Youth Development and Social Support
  • Primary Care and Health Outcomes
  • Urban Transport and Accessibility
  • Public Health Policies and Education
  • Radical Photochemical Reactions
  • Health and Lifestyle Studies
  • Various Chemistry Research Topics
  • Chemical Reaction Mechanisms
  • Global Cancer Incidence and Screening
  • Colorectal Cancer Screening and Detection
  • Evaluation and Performance Assessment
  • Inorganic and Organometallic Chemistry
  • Analytical Chemistry and Chromatography
  • Occupational Health and Safety Research
  • Health Systems, Economic Evaluations, Quality of Life

The University of Texas Health Science Center at Houston
2016-2025

University of Texas Health Science Center at Dallas
2018-2024

Diamond Materials (United States)
2017

Children's Hospital at Montefiore
2014

Albert Einstein College of Medicine
2014

University of Connecticut
2010-2013

Animal Health Trust
2012

UConn Health
2011

Ohio Dominican University
2006

Riley Hospital for Children
2002

Scientists and practitioners alike need reliable, valid measures of contextual factors that influence implementation. Yet, few existing demonstrate reliability or validity. To meet this need, we developed assessed the psychometric properties several constructs within Inner Setting domain Consolidated Framework for Implementation Research (CFIR). We searched literature 7 (Culture Overall, Culture Stress, Effort, Climate, Learning Leadership Engagement, Available Resources). adapted items...

10.1186/s13012-018-0736-7 article EN cc-by Implementation Science 2018-03-27

Abstract Background The purpose of this study was to: 1) examine the maintenance Physical Education and physical activity during distance learning time, 2) determine resources educators are utilizing to deliver PE curricula, 3) understand challenges experienced by learning. Methods A survey sent a cohort school-based fitness assessment software users. Respondents were largely individuals including teachers ( n = 1789), school 62) district administrators 64), nurses 3), “other” 522). Results...

10.1186/s12889-021-10545-x article EN cc-by BMC Public Health 2021-03-11

Abstract Background The burdens of anxiety and depression symptoms have significantly increased in the general US population, especially during this COVID-19 epidemiological crisis. first step an effective treatment for disorders is screening. Patient Health Questionnaire-4 (PHQ-4, a 4-item measure anxiety/depression) its subscales (PHQ-2 [a 2-item depression] Generalized Anxiety Disorder [GAD-2, anxiety]) are brief but mass screening instruments populations. However, little to no study...

10.1186/s12888-024-05665-8 article EN cc-by BMC Psychiatry 2024-03-18

Objective: Regular physical activity (PA) is an important component of pediatric asthma management. No studies have examined how in-school management influences PA from children's perspectives. The aim this study was to explore perceptions the impact on PA. Methods: Qualitative interviews with 23 inner-city minority children (aged 8–10 yrs; 12 girls, 11 boys) were conducted in 10 Bronx, New York elementary schools. Sampling continued until saturation reached. Interviews recorded, transcribed...

10.3109/02770903.2014.920875 article EN Journal of Asthma 2014-05-06

Community engagement is critical to accelerate and improve implementation of evidence-based interventions reduce health inequities. Community-engaged dissemination research (CEDI) emphasizes engaging stakeholders (e.g., community members, practitioners, organizations, etc.) with diverse perspectives, experience, expertise provide tacit knowledge regarding the local context, priorities, needs, assets. Importantly, CEDI can help inequities through incorporating unique perspectives from...

10.1016/j.pmedr.2021.101620 article EN cc-by-nc-nd Preventive Medicine Reports 2021-10-26

Study Design. A retrospective study of 134 adolescent patients who underwent surgical correction idiopathic scoliosis between June 1992 and August 1998 was conducted. Objective. To examine factors related to changes in somatosensory-evoked potentials with or without neurogenic motor-evoked potentials. Summary Background Data. Studies document demonstrate threshold criteria for neuromonitoring that predict spinal cord function. Rates false-negative occurrences are low, yet higher rates...

10.1097/00007632-200204150-00009 article EN Spine 2002-04-01

Abstract Previous work on the effects of crystallinity autoxidation polyolefins is briefly reviewed and shows that polyethylene polypropylene oxidize exclusively in amorphous phase. Measurements rate oxidation poly(4‐methyl pentene‐1) (P4MP) show first‐order oxygen pressure over a wide range film thickness, pressure, temperature. A simple model diffusion followed by chemical reaction fits data very well. Values coefficient for its activation energy, calculated from data, agree well with...

10.1002/polc.5070570134 article EN Journal of Polymer Science Polymer Symposia 1976-01-01

Organizational readiness is essential for high-quality implementation of innovations (programs, policies, practices, or processes). The R = MC 2 heuristic describes three components necessary implementation—the general functioning the organization (general capacities), ability to deliver a particular innovation (innovation-specific and motivation implement innovation. In this article, we describe how used Readiness Building System (RBS) assessing, prioritizing, improving Implementation...

10.3389/fpubh.2022.904652 article EN cc-by Frontiers in Public Health 2022-05-12

Abstract Background One factor considered essential to successful implementation is organizational readiness. The purpose of this study was explore ways improve the measurement readiness, and in particular refine a preliminary measure based on Readiness = Motivation x innovation Specific Capacity General (R MC2) heuristic. We assessed experiences staff Federally Qualified Health Centers (FQHC) implementing evidence-based interventions (EBIs) designed increase colorectal cancer screening...

10.1186/s12913-024-12149-8 article EN cc-by BMC Health Services Research 2025-01-07

Abstract An apparatus is described for the measurement of oxygen uptake into a polymer sample at constant pressures in range 20–1000 mm Hg. Measurements rate poly‐4‐methylpentene‐1 show that accurately first‐order pressure over 50–800 temperatures ranging from 122 to 154°C and film thickness 0.001–0.025 cm. A theoretical treatment kinetics reaction which diffuses both faces thin film, it consumed by shows oxidation ρ per unit area surface given = ∞ tanh ß L /2 where limiting thick thickness,...

10.1002/pol.1975.170130515 article EN Journal of Polymer Science Polymer Chemistry Edition 1975-05-01

Abstract Background Schools are a key setting for supporting youth physical activity, given their broad reach and diverse student populations. Organizational readiness is precursor to the successful implementation of school-based activity opportunities. The R = MC 2 heuristic (Readiness Motivation x Innovation-Specific Capacity General Capacity) describes as function an organization’s motivation capacity implement innovation can be applied better understand process. purpose this study was...

10.1186/s12889-024-17744-2 article EN cc-by BMC Public Health 2024-01-17

Existing adverse childhood experience (ACE) measures include a limited number of household dysfunction (HD) items and the use adult-oriented language that is not always appropriate for middle schoolers. We developed an age-appropriate 10-item HD measure informed by previously validated ACE tested its concurrent validity with dating violence (DV) perpetration, lifetime substance use, mental health outcomes among schoolers in Southeast Texas. This cross-sectional study used baseline data from...

10.1177/08862605251341285 article EN Journal of Interpersonal Violence 2025-05-29

Accurate and valid measures for implementation constructs are critical to advance research guide efforts. However, there is a continued need reliable research. The purpose of this study was assess the psychometric properties Inner Setting domain Consolidated Framework Implementation Research (CFIR) in network pediatric clinics.This used cross-sectional survey data collected from physicians, advanced practice providers, clinic managers, clinical staff (n = 546) working 51). Surveys included...

10.1186/s12913-019-4021-5 article EN cc-by BMC Health Services Research 2019-03-29

Abstract Background Organizational readiness is important for the implementation of evidence-based interventions. Currently, there a critical need comprehensive, valid, reliable, and pragmatic measure organizational that can be used throughout process. This study aims to develop support in two public health settings: federally qualified centers (FQHCs) schools. The informed by Interactive Systems Framework Dissemination Implementation R = MC 2 heuristic ( r eadiness m otivation ×...

10.1186/s43058-020-00088-4 article EN cc-by Implementation Science Communications 2020-11-11

Multiple models and frameworks exist for the measurement classification of physical activity in adults that are applied broadly across populations but have limitations when to youth. The authors propose a conceptual framework specifically designed classifying youth activity.

10.1123/jpah.2020-0603 article EN Journal of Physical Activity and Health 2021-02-14

This study aimed to examine the relation between learning mode with sport participation and compare prevalence in different settings by among United States adolescents during COVID-19 pandemic. A cross-sectional, national survey was conducted a market research company (December 2021-January 2022) parents whose child participated sports pre-pandemic. Parents were asked about their child's (in-person, online, hybrid); (yes/no) pandemic; setting (school, community, club/elite). Weighted...

10.1016/j.pmedr.2023.102151 article EN cc-by-nc-nd Preventive Medicine Reports 2023-02-16

OBJECTIVE:We tested the reproducibility of changes in ambulatory blood pressure (BP) from initial values, an indicator BP reactivity and cardiovascular health outcomes, young, healthy adults.METHOD: The subjects wore monitor attached by same investigator at time day until next morning on two different days (day 1 2) separated a week.We compared change values hourly intervals over 24 waking sleeping hours 2 using linear regression repeated measures analysis covariance.RESULTS: comprised 88...

10.6061/clinics/2013(12)06 article EN cc-by-nc Clinics 2013-01-01

Aseptic loosening is one of the most elusive problems in total knee arthroplasty. We compared failure rates posterior cruciate-substituting arthroplasty utilizing implants with hardened surface coating to a previous cohort patients who underwent procedure traditional cruciate-retaining noncoated cobalt-chrome implants.A retrospective study was conducted 1099 arthroplasties performed from 2009 2017. Two hundred forty-nine January 2015 March 2017 under single design were reviewed...

10.1016/j.artd.2019.02.002 article EN cc-by-nc-nd Arthroplasty Today 2019-03-22

Cancer prevention and control (CPC) behaviors, such as cancer screening, human papillomavirus vaccination, smoking cessation, are critical public health issues. Evidence-based interventions have been identified to improve the uptake of CPC behaviors; however, they often inconsistently implemented, affecting their reach effectiveness. Patient navigation is an evidence-based approach increasing behaviors. Nevertheless, there few programs that use systematically developed implementation...

10.1177/1524839920957979 article EN Health Promotion Practice 2020-10-09

Abstract Implementing evidence‐based interventions remains slow in federally qualified health centers (FQHCs). The purpose of this study is to qualitatively examine the R = MC 2 ( eadiness m otivation × innovation specific c apacity general apacity) heuristic subcomponents context implementing and colorectal cancer screening (CRCS)‐related practice changes FQHCs. We conducted 17 interviews with FQHC employees (1) experiences successful or unsuccessful change efforts, (2) using approaches...

10.1002/jcop.23041 article EN Journal of Community Psychology 2023-04-06
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