Igniting the Fire of Discovery: Creating Partnerships between Research, Education, and Practice.

In the 28th H.P. Maley Lecture, Stacey Dusing, PT, PhD, FAPTA, shares a perspective on the importance of clinician-scientists in bridging the chasm that currently exists between scholarship and clinical practice. Describing herself as a clinician-scientist, or a qualified health care professional who functions mainly as a career scientist with the other portion of time dedicated to clinical practice, Dusing highlights the potential impact of limited training for clinician-scientists in the physical therapy profession and its impact on the future of physical therapy. She challenges all physical therapists to consider the impact of Commission on Accreditation in Physical Therapy Education requirements on scholarship and the lack of requirement for clinical practice, while also recognizing that training programs for clinician-scientists are quite limited. Reviewing some historical data and highlighting possible areas for growth, Dusing calls physical therapists to action in 4 areas. Impact. This paper calls all physical therapists, especially educators and administrators, to consider the role of clinician-scientist in promoting physical therapy and knowledge translation. The author challenges the profession to consider whether we are helping to train or embed clinician-scientists in our clinical workplaces to promote knowledge translation. Suggestions are made to improve research and clinical training programs to increase the number of clinician-scientists in physical therapy.

The impact of severity of motor delay, timing of task mastery, and START-play intervention on the development of means-end problem solving in young children.

BACKGROUND: Children with motor delays are at increased risk for delayed means-end problem-solving (MEPS) performance. OBJECTIVES: To evaluate children with motor delays: 1) the impact of motor delay severity and MEPS mastery timing on developmental trajectories of MEPS; and 2) the effectiveness of Sitting Together And Reaching To Play (START-Play) intervention for improving MEPS. METHODS: This represents a secondary analysis from a multi-site randomized controlled trial, with blinded assessors and prospective registration. Children with mild or significant motor delays (n = 112, mean age=10.80, SD=2.59 months at baseline) were randomly assigned to START-Play or usual care early intervention (UC-EI) and assessed at five visits across one year using the Means-End Problem-Solving Assessment Tool that included three 30-second MEPS trials per visit. Task mastery occurred at the first visit the child achieved the highest level of performance in at least two of the three trials. Multilevel analyses evaluated trajectories of MEPS outcomes dependent upon the timing of MEPS mastery, motor delay severity, and intervention group. RESULTS: At baseline, children with mild motor delays demonstrated better MEPS than children with significant delays, but this difference was only observed for children who achieved mastery late. Children with significant delays demonstrated greater improvements in MEPS in the post-intervention phase compared to children with mild delays. No MEPS differences were found between START-Play and UC-EI. CONCLUSION: Motor delay severity and timing of task mastery impacted MEPS trajectories, whereas START-Play intervention did not impact MEPS for children with motor delays. CLINICAL TRIALS REGISTRY IDENTIFIER: NCT02593825 (https://clinicaltrials.gov/ct2/show/NCT02593825).

Sitting Capacity and Performance in Infants with Typical Development and Infants with Motor Delay.

AIMS: Infants with neuromotor disorders demonstrate delays in sitting skills (decreased capacity) and are less likely to maintain independent sitting during play than their peers with typical development (decreased performance). This study aimed to quantify developmental trajectories of sitting capacity and sitting performance in infants with typical development and infants with significant motor delay and to assess whether the relationship between capacity and performance differs between the groups. METHODS: Typically developing infants (n = 35) and infants with significant motor delay (n = 31) were assessed longitudinally over a year following early sitting readiness. The Gross Motor Function Measure (GMFM) Sitting Dimension was used to assess sitting capacity, and a 5-min free play observation was used to assess sitting performance. RESULTS: Both capacity and performance increased at a faster rate initially, with more deceleration across time, in infants with typical development compared to infants with motor delay. At lower GMFM scores, changes in GMFM sitting were associated with larger changes in independent sitting for infants with typical development, and the association between GMFM sitting and independent sitting varied more across GMFM scores for typically developing infants. CONCLUSIONS: Intervention and assessment for infants with motor delay should target both sitting capacity and sitting performance.

A Feasibility Study of a Physical and Occupational Therapy-Led and Parent-Administered Program to Improve Parent Mental Health and Infant Development.

AIMS: Extremely premature birth puts infants at high risk for developmental delay and results in parent anxiety and depression. The primary objective of this study was to characterize feasibility and acceptability of a therapist-led, parent-administered therapy and massage program designed to support parent mental health and infant development. METHODS: A single cohort of 25 dyads - parents (24 mothers, 1 father) and extremely preterm (<28 wk gestation) infants - participated in the intervention. During hospitalization, parents attended weekly hands-on education sessions with a primary therapist. Parents received bi-weekly developmental support emails for 12 months post-discharge and were scheduled for 2 outpatient follow up visits. We collected measures of parent anxiety, depression, and competence at baseline, hospital discharge, and <4 and 12 months post-discharge. RESULTS: All feasibility targets were met or exceeded at baseline and discharge (≥70%). Dyads participated in an average of 11 therapy sessions (range, 5-20) during hospitalization. Lower rates of data collection adherence were observed over successive follow ups (range, 40-76%). Parent-rated feasibility and acceptability scores were high at all time points. CONCLUSIONS: Results support parent-rated feasibility and acceptability of the TEMPO intervention for extremely preterm infants and their parents in the Neonatal Intensive Care Unit.

Slower pace in early walking onset is related to communication, motor skills, and adaptive function in autistic toddlers.

The onset of walking is a major developmental milestone in early childhood and is critical to the development of language and social communication. Delays in walking have been described in individuals with ASD. Yet, less is known about the quality of early gait development in toddlers with ASD and the relationship to motor skills, social communication, and language. Quantitative measures of locomotion can improve our ability to evaluate subtle and specific motor differences in toddlers with ASD and their relationship to other developmental domains. We used quantitative gait analysis to evaluate locomotion in toddlers with ASD (n = 51) and compared these data to a reference chronological aged (CA) and mental aged (MA) matched typically developing (TD) cohort (n = 45). We also examined the relationship of quantitative gait metrics to developmental measures among toddlers with ASD. We found that although toddlers with ASD achieved a typical age range of walking onset, they exhibited a pattern of slower pace compared to the TD cohort when matched by CA and MA. We also found that slower measures of pace were associated with lower developmental scores of communication, motor skills, and adaptive function. Our findings improve characterization of locomotion in toddlers with ASD and the relationship of motor skills to other developmental domains.

Infant massage as a stress management technique for parents of hospitalized extremely preterm infants.

Mothers of infants born extremely preterm requiring prolonged medical intervention in the Neonatal Intensive Care Unit (NICU) are at high risk of developing stress. Parent-administered infant massage is a well-established, safe intervention for preterm infants with many developmental benefits, but the published literature has mostly examined its impact on infants and parents through self-reported or observational measures of stress. The aim of this study was to measure salivary cortisol, a biomarker for stress, in extremely preterm infants and their mothers immediately pre and post parent-administered infant massage in order to detect potential changes in physiologic stress. Twenty-two mother-infant dyads completed massage education with a physical or occupational therapist. All dyads provided salivary cortisol samples via buccal swab immediately pre- and post-massage at the second session. Of mothers determined to be "cortisol responders" (15/22), salivary cortisol levels were lower after massage (pre-minus post-level: -26.47 ng/dL, [CI = -4.40, -48.53], p = .016, paired t-test). Our primary findings include a clinically significant decrease (as measured by percent change) in maternal cortisol levels immediately post parent-administered massage, indicating decreased physiological stress. Integration of infant massage into NICU clinical practice may support maternal mental health, but further powered studies are necessary to confirm findings.

Las madres de infantes nacidos extremadamente prematuros en la Unidad de Cuidado Intensivo Neonatal (NICU) se encentran bajo alto riesgo de desarrollar estrés. El masaje que una madre le da al infante es una intervención segura, bien establecida, para infantes prematuros, con muchos beneficios de desarrollo, aunque la información publicada disponible ha examinado por la mayor parte el impacto del masaje en los infantes y progenitores por medio de medidas de estrés auto reportadas o de observación. El propósito de este estudio fue medir el cortisol salival, un biomarcador de estrés, en infantes extremadamente prematuros y sus madres inmediatamente antes y después del masaje que la madre le da, para detectar posibles cambios en el estrés fisiológico. Veintidós díadas madre-infante completaron 2 sesiones educativas de masaje con un terapeuta físico u ocupacional. Todas las díadas aportaron muestras de cortisol salival por medio de hisopado bucal inmediatamente antes y después del masaje en la segunda sesión. Los niveles de cortisol en infantes no fueron suficientes para el análisis. De las madres a quienes se les determinó haber dado "respuesta de cortisol" (15/22), los niveles de cortisol salival fueron más bajos después del masaje (nivel antes menos nivel después: −26.47 ng/dL, [CI = −4.40, −48.53]. p = .016, prueba-t pareada). Entre nuestros resultados primarios se incluye una baja clínicamente significativa (tal como fue medida por el cambio porcentual) en los niveles de cortisol materno inmediatamente después del masaje. Estos resultados sugieren que el masaje dado por la madre a infantes prematuros pudiera reducir el cortisol materno, un marcador fisiológico de estrés.

Early Mobility and Crawling: Beliefs and Practices of Pediatric Physical Therapists in the United States.

PURPOSE: To characterize beliefs of pediatric physical therapists (PTs) in the United States regarding the role of crawling in infant development and clinical practice. METHODS: Pediatric PTs reported their beliefs about early mobility and crawling, clinical approaches related to early mobility and crawling, and agreement with the removal of crawling from the Centers for Disease Control and Prevention (CDC)'s updated developmental milestone checklists in an online survey. Analyses examined associations between information sources and beliefs, between beliefs and clinical approaches, and between beliefs and CDC update opinions. RESULTS: Most participants believed that crawling was important (92%) and linked to a variety of positive developmental outcomes (71%-99%) and disagreed with its removal from the CDC checklists (79%). Beliefs were linked with clinical approaches focused on promoting crawling and discouraging other forms of mobility. CONCLUSIONS: Further research is needed to determine whether pediatric PTs' beliefs and clinical practices are supported by evidence.

Parent and Therapist Perceptions of the Feasibility, Acceptability, and Benefits of a Weekly Therapist-Led Massage Program for Extremely Preterm Infants in Neonatal Intensive Care.

Mothers of extremely preterm infants experience high rates of mental health disorders that impair maternal-infant interaction and lead to worse infant developmental outcomes. Therapist Education and Massage for Parent-Infant Outcomes (TEMPO) is a therapist-led program that standardizes the nature and frequency of parent education through weekly scheduled therapy sessions. Using a family-centered approach, the therapist facilitates positive maternal-infant interactions and massage interventions from birth throughout hospitalization with the goal of improving maternal mental health. This qualitative study presents the results of 19 parent interviews and of a focus group of four TEMPO interventionists to elicit feedback about the program. Overall, parents and therapists viewed the program positively. Parents and therapists valued the focus on parent education and engagement to increase parent competence and bonding opportunities. Both groups acknowledged that infant massage had both infant-centered and parent-centered benefits. One area where parent and therapist views did not align was regarding feasibility of TEMPO. Parents noted multiple logistical challenges to regular NICU visitation, but ultimately agreed that attending weekly therapy sessions was feasible. Therapists noted increased time and effort required of TEMPO and felt that institutional and system-level changes would be necessary to implement weekly parent education as standard of care.

Impact of the COVID-19 Pandemic on a Clinical Trial: A Quantitative Report on Study Engagement and Strategies.

INTRODUCTION: The COVID-19 pandemic impacted clinical research worldwide potentially altering research findings. The study purpose was to measure the effect of the pandemic on recruitment, retention, assessment, and intervention completion rates. METHODS: Enrollment and participation data from a clinical trial evaluating efficacy of a physical therapy intervention for high-risk preterm infants were compared across 3 pandemic periods (February 2019 through November 2021). RESULTS: Recruitment, retention, assessment, and intervention completion rates were lowest during the peak pandemic period. CONCLUSIONS: In compliance with the Human Subjects Review Board, and for the participants' and staff safety, transition from in-person to telehealth or hybrid visits was required to continue this longitudinal study. Despite the negative effect of the pandemic, parental resilience and commitment to the study was clear. Flexibility, quick action, dedication, and efficiency of the research team were key elements enabling study continuation with successful transition to telehealth assessments/interventions during the peak pandemic period.

Parent Experiences in the NICU and Transition to Home.

Families (n = 12) with infants born at <29 weeks gestation shared their experiences while in the NICU and transitioning home. Parents were interviewed 6-8 weeks after NICU discharge, including some during the acute phase of the COVID-19 pandemic. Findings regarding the parent experience in the NICU were focused around challenges navigating parent-infant separation, social isolation, communication difficulties, limited knowledge of preterm infants, mental health challenges. Parents also discussed supports that were present and supports they wished were present, as well as the impact of COVID-19 on their experiences. In the transition to home, primary experiences included the sudden nature of the transition, anxiety around discharge preparation, and the loss of the support from nursing staff. During the first few weeks at home, parents expressed joy and anxiety, particularly around feeding. The COVID-19 pandemic limited emotional, informational, and physical support to parents and resulted in limited mutual support from other parents of infants in the NICU. Parents of preterm infants in the NICU present with multiple stressors, rendering attending to parental mental health crucial. NICU staff need to address logistical barriers and familial priorities impacting communication and parent-infant bonding. Providing multiple opportunities for communication, participating in caretaking activities, and meeting other families can be important sources of support and knowledge for parents of very preterm infants.

Embedding Play to Enrich Physical Therapy.

Play is an active process by which an individual is intrinsically motivated to explore the self, the environment, and/or interactions with another person. For infants and toddlers, engaging in play is essential to support development across multiple domains. Infants and toddlers with or at risk of motor delays may demonstrate differences in play or challenges with engaging in play activities compared to typically developing peers. Pediatric physical therapists often use play as a modality to engage children in therapeutic assessment and interventions. Careful consideration of the design and use of physical therapy that embeds play is needed. Following a 3-day consensus conference and review of the literature, we propose physical therapy that embeds play should consider three components; the child, the environment, and the family. First, engage the child by respecting the child's behavioral state and following the child's lead during play, respect the child's autonomous play initiatives and engagements, use activities across developmental domains, and adapt to the individual child's needs. Second, structure the environment including the toy selection to support using independent movements as a means to engage in play. Allow the child to initiate and sustain play activities. Third, engage families in play by respecting individual family cultures related to play, while also providing information on the value of play as a tool for learning. Partner with families to design an individualized physical therapy routine that scaffolds or advances play using newly emerging motor skills.

Factors Influencing Receipt and Type of Therapy Services in the NICU.

Understanding the type and frequency of current neonatal intensive care unit (NICU) therapy services and predictors of referral for therapy services is a crucial first step to supporting positive long-term outcomes in very preterm infants. This study enrolled 83 very preterm infants (<32 weeks, gestational age mean 26.5 ± 2.0 weeks; 38 male) from a longitudinal clinical trial. Race, neonatal medical index, neuroimaging, and frequency of therapy sessions were extracted from medical records. The Test of Infant Motor Performance and the General Movement Assessment were administered. Average weekly sessions of occupational therapy, physical therapy, and speech therapy were significantly different by type, but the magnitude and direction of the difference depended upon the discharge week. Infants at high risk for cerebral palsy based on their baseline General Movements Assessment scores received more therapy sessions than infants at low risk for cerebral palsy. Baseline General Movements Assessment was related to the mean number of occupational therapy sessions but not physical therapy or speech therapy sessions. Neonatal Medical Index scores and Test of Infant Motor Performance scores were not predictive of combined therapy services. Medical and developmental risk factors, as well as outcomes from therapy assessments, should be the basis for referral for therapy services in the neonatal intensive care unit.

Implementation of a Comprehensive Anti-Racism Plan in an Academic Physical Therapy Department: An Administrative Case Report.

OBJECTIVE: Transforming the University of Southern California health care system requires that institutions and organizations position equity, diversity, inclusion (EDI), and anti-racism as central to their missions. The purpose of this administrative case report was to describe a systematic approach taken by an academic physical therapy department to develop a comprehensive antiracism plan that engages all interested and affected parties and includes processes for sustainable, long-term engagement. METHODS: Four strategies contributed to organizational change toward anti-racism: Holding Ourselves Accountable; Developing a Plan; Building Consensus; and Providing Education, Support, and Resources. The attitudes of faculty and staff about racism and anti-racist actions were assessed through surveys at the start of the process and after 1 year. Engagement in activities, meetings, and trainings related to EDI and anti-racism was logged for faculty and staff. RESULTS: From November 2020 through November 2021, several outcomes were achieved, including: making structural organizational changes; updating faculty merit review to include EDI; developing a bias reporting mechanism; establishing faculty development activities, resources, and groups; and implementing structured efforts to recruit a diverse cohort. Within that year, faculty and staff engaged in 99.32 hours of EDI and anti-racism trainings, workshops, and resource groups. Survey data showed persistent high support and commitment to EDI and anti-racism. Faculty and staff reported that they felt more equipped to identify and address individual and institutional racism and they reported risking their reputations to talk about race more often. Confidence in their ability to identify and resolve conflicts related to microaggressions, cultural insensitivity, and bias improved. However, their self-reported ability to identify and address structural racism remained unchanged. CONCLUSION: By approaching anti-racism as transformative rather than performative, an academic physical therapy department was able to develop and implement a comprehensive anti-racism plan with high support and engagement. IMPACT: The physical therapy profession has not been immune to racism and health injustice. Organizational change to become anti-racist is imperative for excellence and a necessary challenge to undertake if the physical therapy profession is to transform society and improve the human experience.

Benefits of maternally-administered infant massage for mothers of hospitalized preterm infants: a scoping review.

OBJECTIVES: Infant massage (IM) is a well-studied, safe intervention known to benefit infants born preterm. Less is known about the benefits of maternally-administrated infant massage for mothers of preterm infants who often experience increased rates of anxiety and depression in their infants' first year of life. This scoping review summarizes the extent, nature, and type of evidence linking IM and parent-centered outcomes. METHODS: The Preferred Reporting Items for Systematic reviews and Meta-Analyses Extension for scoping reviews (PRISMA-ScR) protocol was followed using three databases: PubMed, Embase, and CINAHL. Thirteen manuscripts evaluating 11 separate study cohorts met pre-specified inclusion criteria. RESULTS: Six primary topics related to the influence of infant massage on parent outcomes emerged: 1) anxiety, 2) perceived stress, 3) depressive symptoms, 4) maternal-infant interaction, 5) maternal satisfaction, and 6) maternal competence. Emerging evidence supports that infant massage, when administered by mothers, benefits mothers of preterm infants by reducing anxiety, stress, and depressive symptoms and improving maternal-infant interactions in the short-term, but there is limited evidence to support its effectiveness on these outcomes in longer periods of follow-up. Based on effect size calculations in small study cohorts, maternally-administered IM may have a moderate to large effect size on maternal perceived stress and depressive symptoms. CONCLUSIONS: Maternally-administered IM may benefit mothers of preterm infants by reducing anxiety, stress, depressive symptoms, and by improving maternal-infant interactions in the short-term. Additional research with larger cohorts and robust design is needed to understand the potential relationship between IM and parental outcomes.

START-Play Physical Therapy Intervention Indirectly Impacts Cognition Through Changes in Early Motor-Based Problem-Solving Skills.

PURPOSE: This study tested whether the Sitting Together and Reaching to Play (START-Play) physical therapy intervention indirectly impacts cognition through changes in perceptual-motor skills in infants with motor delays. METHODS: Participants were 50 infants with motor delays randomly assigned to START-Play plus Usual Care Early Intervention (UC-EI) or UC-EI only. Infants' perceptual-motor and cognitive skills were assessed at baseline and 1.5, 3, 6, and 12 months post-baseline. RESULTS: Short-term changes in sitting, fine motor skills, and motor-based problem-solving, but not reaching, predicted long-term changes in cognition. START-Play indirectly impacted cognition through motor-based problem-solving but not sitting, reaching, or fine motor skills. CONCLUSIONS: This study provided preliminary evidence that early physical therapy interventions that blend activities across developmental domains and are supported by an enriched social context can place infants on more optimal developmental trajectories.

Health Care Professionals' Perceptions About a Telehealth Model of Therapy After NICU Discharge.

The Baby Bridge program is an implementation strategy to improve access to in-person early therapy services following neonatal intensive care unit (NICU) discharge. The objective of this study was to evaluate acceptability of Baby Bridge telehealth services among health care providers. Interviews with health care providers were conducted, transcribed, and coded in NVivo. Deductive analysis was used to organize data into negative and positive comments, suggestions for optimization, and perceptions about the first visit. Next, a conventional approach was used to organize the data into themes. Telehealth was viewed as an acceptable, but not necessarily preferable, form of Baby Bridge delivery. Providers identified how telehealth may improve access to care, but with potential challenges in delivery. Suggestions for optimization of the Baby Bridge telehealth model were proposed. Identified themes included delivery model, family demographics, therapist and organizational characteristics, parent engagement, and therapy facilitation. These findings provide important insights to consider when transitioning from in-person therapy to telehealth.

Efficacy of Therapist Supported Interventions from the Neonatal Intensive Care Unit to Home: A Meta-Review of Systematic Reviews.

Infants born preterm or with complicated medical conditions requiring care in the neonatal intensive care unit (NICU) are at high risk for long-term developmental disabilities. The transition from NICU to early intervention/outpatient settings results in a disruptive gap in a therapeutic intervention during a period of maximal neuroplasticity and development. This meta-review evaluated evidence from existing systematic reviews regarding therapeutic interventions that start in the NICU and continue at home with the goal of improving developmental outcomes for infants at high risk for cerebral palsy. We also evaluated the impact of these interventions on parents' mental health outcomes.

The Effect of START-Play Intervention on Reaching-Related Exploratory Behaviors in Children with Neuromotor Delays: A Secondary Analysis of a Randomized Controlled Trial.

AIMS: Children with neuromotor delays are at risk for reaching and object exploration impairments, which may negatively affect their cognitive development and daily activity performance. This study evaluated the effectiveness of the Sitting Together And Reaching To Play (START-Play) intervention on reaching-related exploratory behaviors in children with neuromotor delays. METHODS: In this randomized controlled clinical trial, 112 children (Mean = 10.80, SD = 2.59 months old at baseline) with motor delays were randomly assigned to receive START-Play intervention or usual care-early intervention. Performance for ten reaching-related exploratory behaviors was assessed at baseline and 1.5, 3, 6, 12 months post-baseline. Piecewise linear mixed-effects modeling was used to evaluate short- and long-term effects of the intervention. RESULTS: Benefits of START-Play were observed for children with significant motor delays, but not for those with mild delays. START-Play was especially beneficial for children with significant motor delays who demonstrated early mastery in the reaching assessment (i.e., object contact ≥65% of the time within 3 months after baseline); these children showed greater improvements in manual, visual, and multimodal exploration, as well as intensity of exploration across time. CONCLUSIONS: START-Play advanced the performance of reaching-related exploratory behaviors in children with significant motor delays.

Opportunities for learning and social interaction in infant sitting: Effects of sitting support, sitting skill, and gross motor delay.

The development of independent sitting changes everyday opportunities for learning and has cascading effects on cognitive and language development. Prior to independent sitting, infants experience the sitting position with physical support from caregivers. Why does supported sitting not provide the same input for learning that is experienced in independent sitting? This question is especially relevant for infants with gross motor delay, who require support in sitting for many months after typically developing infants sit independently. We observed infants with typical development (n = 34, ages 4-7 months) and infants with gross motor delay (n = 128, ages 7-16 months) in early stages of sitting development, and their caregivers, in a dyadic play observation. We predicted that infants who required caregiver support for sitting would spend more time facing away from the caregiver and less time contacting objects than infants who could sit independently. We also predicted that caregivers of supported sitters would spend less time contacting objects because their hands would be full supporting their infants. Our first two hypotheses were confirmed; however, caregivers spent surprisingly little time using both hands to provide support, and caregivers of supported sitters spent more time contacting objects than caregivers of independent sitters. Similar patterns were seen in the group of typically developing infants and the infants with motor delay. Our findings suggest that independent sitting and supported sitting provide qualitatively distinct experiences with different implications for social interaction and learning opportunities. HIGHLIGHTS: During seated free play, supported sitters spent more time facing away from their caregivers and less time handling objects than independent sitters. Caregivers who spent more time supporting infants with both hands spent less time handling objects; however, caregivers mostly supported infants with one or no hands. A continuous measure of sitting skill did not uniquely contribute to these behaviors beyond the effect of binary sitting support (supported vs. independent sitter). The pattern of results was similar for typically developing infants and infants with gross motor delay, despite differences in age.

Effect of a NICU to Home Physical Therapy Intervention on White Matter Trajectories, Motor Skills, and Problem-Solving Skills of Infants Born Very Preterm: A Case Series.

Infants born very preterm (VPT; ≤29 weeks of gestation) are at high risk of developmental disabilities and abnormalities in neural white matter characteristics. Early physical therapy interventions such as Supporting Play Exploration and Early Development Intervention (SPEEDI2) are associated with improvements in developmental outcomes. Six VPT infants were enrolled in a randomised clinical trial of SPEEDI2 during the transition from the neonatal intensive care unit to home over four time points. Magnetic resonance imaging scans and fixel-based analysis were performed, and fibre density (FD), fibre cross-section (FC), and fibre density and cross-section values (FDC) were computed. Changes in white matter microstructure and macrostructure were positively correlated with cognitive, motor, and motor-based problem solving over time on developmental assessments. In all infants, the greatest increase in FD, FC, and FDC occurred between Visit 1 and 2 (mean chronological age: 2.68-6.22 months), suggesting that this is a potential window of time to optimally support adaptive development. Results warrant further studies with larger groups to formally compare the impact of intervention and disparity on neurodevelopmental outcomes in infants born VPT.