No Association Between Injury-Related Fear and Isokinetic Quadriceps Strength in Individuals With a History of Anterior Cruciate Ligament Reconstruction.

CONTEXT: Injury-related fear and quadriceps strength are independently associated with secondary anterior cruciate ligament (ACL) injury risk. It is not known whether injury-related fear and quadriceps strength are associated, despite their individual predictive capabilities of secondary ACL injury. The purpose of this study was to examine the association between injury-related fear and quadriceps strength in individuals at least 1 year after ACL reconstruction (ACLR). DESIGN: Cross-sectional study. METHODS: Forty participants between the ages of 18 and 35 years at least 1 year post unilateral primary ACLR. Participants completed the Tampa Scale of Kinesiophobia-11 (TSK-11) and a standard isokinetic quadriceps strength assessment using the Biodex Isokinetic Dynamometer. Pearson Product-Moment correlations were used to examine the linear association between the TSK-11 scores and peak torque (in nanometers per kilogram) for each limb and between the TSK-11 scores and limb symmetry indices for each limb. Pearson Product-Moment correlation coefficients (r) were interpreted as very high (.90-1.00), high (.70-.90), moderate (.50-.70), low (.30-.50), and no correlation (.00-.30). RESULTS: The average TSK-11 score was 18.2 (5.3), average ACLR peak quadriceps torque was 1.9 (0.50) N·m/kg, average contralateral peak quadriceps torque was 2.3 (0.48) N·m/kg, and average limb symmetry index was 85.3% (12.6%). There was no statistically significant correlation between the TSK-11 and peak quadriceps torque on the ACLR limb (r = .12, P = .46), the TSK-11 and contralateral limb (r = .29, P = .07), or the TSK-11 and limb symmetry index (r = -.18, P = .27). CONCLUSIONS: There was no association between kinesiophobia and peak isokinetic quadriceps strength in individuals at least 1 year post-ACLR. Both factors, independently, have been shown to influence risk of secondary injury in patients after ACLR.

Health-Related Quality of Life and Psychological Outcomes in Participants with Symptomatic and Non-Symptomatic Knees after ACL Reconstruction.

Background: Individuals who sustain an ACL injury and undergo reconstruction (ACLR) are at risk for the development of osteoarthritis. Recent investigations have applied the Englund criteria to categorize people with a history of ACLR as someone with a symptomatic or asymptomatic knee. Purpose/Hypothesis: The purpose of this study was to examine differences in health-related quality of life (HRQL) and psychological outcomes in people with a history of ACLR who were categorized as symptomatic or non-symptomatic by application of the Englund criteria. The authors' hypothesized participants classified as symptomatic would have lower HRQL, increased fear-avoidance beliefs, and decreased resilience compared to participants classified as non-symptomatic. Study design: Cross-sectional, survey. Methods: Participants at least one-year after ACLR were recruited for the study and completed the Tegner Activity Scale, the Brief Resilience Scale (BRS), the modified Disablement in the Physically Active Scale (mDPA), and the Fear-Avoidance Belief Questionnaire (FABQ) at one time-point. Descriptive statistics were summarized using median [interquartile range] and differences between groups were examined using separate Mann-Whitney U tests. Results: Participants with symptomatic knees had a significantly higher BMI (24.8 [6.4]) than the non-symptomatic group (21.2 [4.3], p=0.013). Participants in the symptomatic group had worse HRQL on the physical subscale (12.5 [16.3] vs. 0.0 [2.5], p<0.001) and mental subscale (2.0 [1] vs. 0.0 [1], p=0.031), higher scores on the FABQ-Sport (14.5 [11] vs. 0.0 [6], p<0.001) and FABQ-Physical Activity (20 [24] vs. 1 [4], p<0.001) and less resilience (3.7[0.42] vs. 4.0 [0.83], p=0.028) compared to those participants in the non-symptomatic group. There were no differences in current physical activity (p=0.285) or change in physical activity (p=0.124) levels between the two groups. Conclusions: This series of differences may represent a cascade of events that can continue to negatively impact health outcomes across the lifespan for individuals with a history of ACLR. Future research should consider longitudinal investigations of these outcomes after injury and throughout the post-surgical and post-rehabilitation timeframe. Level of Evidence: Level 3b.

Youth sport participation, injury history, and current physical activity among young adults.

Objective: To examine the interaction between high school (HS) sports participation and injury history with current moderate-to-vigorous physical activity (MVPA) among young adults. Participants: Participants (N = 236) were 18-25 years old, not currently injured, and reported no physical activity limitations. Methods: Participants completed online demographic, injury history, and physical activity surveys. A two-way analysis of covariance was used to test the interaction between HS athlete status and previous injury severity on current self-reported MVPA. Results: Participants were 22.2 ± 2.1 years, primarily White (81.8%) or Asian (6.4%), and female (77.5%). After including body mass index and race as covariates, there was a statistically significant interaction between HS athlete status and previous injury history such that current MVPA was higher among former HS athletes compared to HS recreational/nonathletes when individuals reported no injuries or mild injury severity. MVPA was similar across athlete status groups when participants reported high levels of injury severity. Conclusions: Future studies should examine whether young adults who have experienced multiple and/or severe injuries as competitive HS athletes have unique physical activity barriers.

Effects of foot intensive rehabilitation (FIRE) on clinical outcomes for patients with chronic ankle instability: a randomized controlled trial protocol.

BACKGROUND: Lateral ankle sprains account for a large proportion of musculoskeletal injuries among civilians and military service members, with up to 40% of patients developing chronic ankle instability (CAI). Although foot function is compromised in patients with CAI, these impairments are not routinely addressed by current standard of care (SOC) rehabilitation protocols, potentially limiting their effectiveness. The purpose of this randomized controlled trial is to determine if a Foot Intensive REhabilitation (FIRE) protocol is more effective compared to SOC rehabilitation for patients with CAI. METHODS: This study will use a three-site, single-blind, randomized controlled trial design with data collected over four data collection points (baseline and post-intervention with 6-, 12-, and 24-month follow-ups) to assess variables related to recurrent injury, sensorimotor function, and self-reported function. A total of 150 CAI patients (50 per site) will be randomly assigned to one of two rehabilitation groups (FIRE or SOC). Rehabilitation will consist of a 6-week intervention composed of supervised and home exercises. Patients assigned to SOC will complete exercises focused on ankle strengthening, balance training, and range of motion, while patients assigned to FIRE will complete a modified SOC program along with additional exercises focused on intrinsic foot muscle activation, dynamic foot stability, and plantar cutaneous stimulation. DISCUSSION: The overall goal of this trial is to compare the effectiveness of a FIRE program versus a SOC program on near- and long-term functional outcomes in patients with CAI. We hypothesize the FIRE program will reduce the occurrence of future ankle sprains and ankle giving way episodes while creating clinically relevant improvements in sensorimotor function and self-reported disability beyond the SOC program alone. This study will also provide longitudinal outcome findings for both FIRE and SOC for up to two years. Enhancing the current SOC for CAI will improve the ability of rehabilitation to reduce subsequent ankle injuries, diminish CAI-related impairments, and improve patient-oriented measures of health, which are critical for the immediate and long-term health of civilians and service members with this condition. Trial Registration Clinicaltrials.gov Registry: NCT #NCT04493645 (7/29/20).

The Relationship Between Health-Related Quality of Life and Lower-Extremity Visuomotor Reaction Time in Young Adult Women Following Ankle Sprain.

CONTEXT: Many individuals who sustain a lateral ankle sprain (LAS) fail to return to prior activity due to residual symptoms; and report elevated levels of injury-related fear, decreased function, and decreased health-related quality of life (HRQOL). Additionally, individuals with history of LAS exhibit deficits in neurocognitive functional measures like visuomotor reaction time (VMRT), which contributes to worse patient-reported outcome scores. The aim of this study was to examine the relationship between HRQOL and lower-extremity (LE) VMRT in individuals with LAS history. DESIGN: Cross-sectional. METHODS: Young adult female volunteers with history of LAS (n = 22; age = 24 [3.5] y; height = 163.1 [9.8] cm; mass = 65.1 [11.5] kg; and time since last LAS = 67.8 [50.5] mo) completed HRQOL outcomes including the following: (1) Tampa Scale of Kinesiophobia-11, (2) Fear-Avoidance Beliefs Questionnaire, (3) Penn State Worry Questionnaire, (4) modified Disablement in the Physically Active Scale, and (5) Foot and Ankle Disability Index (FADI). Additionally, participants completed a LE-VMRT task by responding to a visual stimulus using their foot to deactivate light sensors. Participants completed trials bilaterally. Separate Spearman rho correlations were performed to assess the relationship between patient-reported outcomes assessing constructs of HRQOL and LE-VRMT bilaterally. Significance was set at P < .05. RESULTS: There was a strong, significant negative correlation between FADI-Activities of Daily Living (ρ = -.68; P = .002) and FADI-Sport (ρ = -.76; P = .001) scores and injured limb LE-VMRT; moderate, significant negative correlations between the uninjured limb LE-VMRT and FADI-Activities of Daily Living (ρ = -.60; P = .01) and FADI-Sport (ρ = -.60; P = .01) scores; and moderate, significant positive correlations between the injured limb LE-VMRT and modified Disablement in the Physically Active Scale-Physical Summary Component (ρ = .52; P = .01) and modified Disablement in the Physically Active Scale-Total (ρ = .54; P = .02) scores. All other correlations were not statistically significant. CONCLUSIONS: Young adult women with history of LAS demonstrated an association between self-reported constructs of HRQOL and LE-VMRT. As LE-VMRT is a modifiable injury risk factor, future studies should examine the effectiveness of interventions designed to improve LE-VMRT and the impact on self-reported HRQOL.

Slower visuomotor reaction time in division-I collegiate athletes with a history of ankle sprain.

The purpose of this study was to compare visuomotor reaction time (VMRT) in collegiate athletes based on ankle sprain history. Participants included athletes with ankle sprain history (n = 18) and athletes with no ankle sprain history (n = 33). Participants completed an upper-extremity VMRT task which was comprised of eight wireless light-emitting diode sensors. The difference between reaction time (sec) and the number of "Hits" and "Misses" were compared between groups. The ankle sprain history group had significantly slower VMRT compared to the no ankle sprain history group with moderate effect sizes. However, there was no difference in the number of "Hits" or "Misses" between groups, despite observing moderate effect sizes. This result suggests that VMRT may be a potential target for prevention and rehabilitation strategies in individuals with ankle sprains. However, further research is needed to better understand the role of VMRT on the risk of ankle sprains.

Exploratory Examination of Knee Self-Efficacy in Individuals With a History of ACL Reconstruction and Sport-Related Concussion.

CONTEXT: Knee self-efficacy and injury-related fear are associated with poor self-reported knee function and decreased physical activity (PA) after ACL reconstruction (ACLR). Limited research has explored contextual factors that may influence psychological responses in this population, such as history of sport-related concussion (SRC). After SRC, individuals may experience increased negative emotions, such as sadness and nervousness. However, it is unknown how SRC history may influence knee-self efficacy and injury-related fear in individuals with ACLR. The purpose of this study was to compare knee self-efficacy and injury-related fear in individuals after ACLR who present with and without history of SRC. DESIGN: Cross-sectional study. METHODS: Forty participants ≥1 year postunilateral ACLR were separated by history of SRC (no SRC = 29, SRC = 11). The Knee Self-Efficacy Scale (KSES) and subscales measured certainty regarding performance of daily activities (KSES-ADL), sports/leisure activities (KSES-Sport), physical activities (KSES-PA), and future knee function (KSES-Future). The Tampa Scale of Kinesiophobia-11 measured injury-related fear. Mann-Whitney U tests were used to examine between-group differences. Hedges g effect sizes and 95% confidence interval were used to examine clinically meaningful group differences. RESULTS: Individuals with a history of ACLR and SRC demonstrated worse KSES-PA (7.5 [5.3]) compared with those without a history of SRC (8.1 [6.1], P = .03). No other statistically significant differences were observed. A medium effect size was present for the KSES-PA (0.62), KSES-ADL (0.42), KSES-Present (ADL + PA + Sport) (0.48), KSES-Total (0.53), and Tampa Scale of Kinesiophobia-11 (0.61) but must be interpreted with caution as 95% confidence interval crossed 0. CONCLUSIONS: This exploratory study indicated that individuals with a history of ACLR and SRC had worse knee self-efficacy for PA compared with those without history of SRC. Rehabilitation specialists should monitor knee self-efficacy deficits in the post-ACLR population and recognize the potential influence of cumulative injury history on rehabilitative outcomes.

Sports Specialization, Physical Literacy, and Physical Activity Levels in Young Adults.

CONTEXT: Youth sport specialization may be associated with physical literacy and physical activity in young adulthood. The purposes of this study were to compare young adult (18-25 y) physical literacy and physical activity by high school sport specialization status and to examine the relationship between current physical activity and physical literacy. DESIGN: Retrospective, cross-sectional study design. METHODS: Participants were recruited from ResearchMatch, university classes, and social media posts. Participants (N = 172; aged 22.1 [2.1] y; 80.1% female) completed the following anonymous surveys on REDCap to assess: demographics and injury history, sport specialization, physical literacy (PLAYself), and physical activity (Godin Leisure-Time Exercise Questionnaire). RESULTS: When controlling for age, there were no statistically significant differences in physical literacy (F2,166 = 2.02, P = .14) or moderate to vigorous physical activity (F2,161 = 0.24, P = .79) between sport specialization groups. There was a moderate, positive relationship between physical literacy and physical activity (r = .33, P < .001). CONCLUSIONS: Young adult physical literacy and physical activity were similar regardless of youth sport specialization level. Young adult physical literacy was positively associated with physical activity. Future studies should consider physical literacy as a possible correlate of physical activity among young adults.

Examining physical literacy in young adults: psychometric properties of the PLAYself.

The PLAYself is a commonly utilized tool to assess physical literacy in child and adolescent populations. Currently, there are no measurement tools designed to examine physical literacy among adults. The purpose of this cross-sectional study was to examine the psychometric properties of PLAYself subsections in a sample of young adults. Two hundred forty-five young adults (ages 18-25) from the United States completed the PLAYself questionnaire. Multiple principal component analyses using promax rotation were utilized to assess the current factor structure of the PLAYself subsections. Each subsection was analyzed independently to explore individual summary components. PLAYself subsections were assessed for reliability using Cronbach's α, inter-item correlations, and item-total correlations. A multi-factor structure was identified for each PLAYself subsection. A 2-factor structure was identified for the Environment subsection accounting for 55.2% of the variance. A 2-factor structure was identified for the Physical Literacy Self-Description subsection accounting for 57.1% of the variance. A 3-factor structure was identified for the Relative Ranking of Literacies subsection accounting for 70.3% of the variance. The Environment, Physical Literacy Self-Description, and Relative Ranking of Literacies subsections demonstrated poor (α = 0.577), good (α = 0.89), and acceptable (α = 0.79) internal consistencies, respectively. The Physical Literacy Self-Description subsection demonstrated the best psychometric properties in our sample, and thus may be an appropriate tool to assess physical literacy in a young adult population until additional measurement tools are developed.

Exploratory factor analysis of the fear-avoidance beliefs questionnaire in patients with chronic ankle instability.

PURPOSE: To perform an exploratory factor analysis of the Fear-Avoidance Beliefs Questionnaire in patients with chronic ankle instability. METHODS: A cross-sectional survey study was utilized. The Fear-Avoidance Beliefs Questionnaire was administered to patients with chronic ankle instability who met the inclusion criteria. Both an unrestricted and restricted factor analysis with varimax rotation were utilized to explore the factor structure of the instrument. Kaiser-Meyer-Olkin values were used to determine sampling adequacy. Bartlett's test of sphericity was used to justify that the correlations were suitable for the principal component analysis. RESULTS: The restricted two-factor analysis resulted in two factors with acceptable internal consistency values. The Keiser-Meyer-Olkin value was acceptable (0.81), and Bartlett's test of sphericity was significant (χ2 (55) = 515.59, p < 0.001). CONCLUSION: The ankle-specific Fear-Avoidance Beliefs Questionnaire consists of two stable factors and should be used to further examine fear-avoidance beliefs in people with chronic ankle instability.

Test Batteries After Primary Anterior Cruciate Ligament Reconstruction: A Systematic Review.

CONTEXT: There is a lack of consensus regarding test batteries for return to sport (RTS) after anterior cruciate ligament reconstruction (ACLR). OBJECTIVE: To report the RTS test batteries for individuals after ACLR and to examine alignment with the American Academy of Orthopaedic Surgeons (AAOS) Appropriate Use Criteria (AUC). Finally, to examine how published RTS batteries prior to the AAOS AUC (2010-2015) compared with those after publication of the AUC (2016-2020). DATA SOURCE: A systematic search of PubMed (2010-2020). STUDY SELECTION: Studies were included if they were published from 2010 to 2020, patients underwent primary ACLR and were tested between 6 months and 2 years postoperatively and included a minimum of 2 assessments. Studies were excluded if patients were tested outside the designated time; had undergone a revision, contralateral, or multiligament injury; included healthy participants; were level 5 evidence or the study was a systematic review. A total of 1012 articles were reviewed and 63 met the criteria. STUDY DESIGN: Systematic review. LEVEL OF EVIDENCE: Level 4. DATA EXTRACTION: Information regarding the RTS batteries and patient demographics were extracted from the included articles. RESULTS: A total of 63 studies met the inclusion and exclusion criteria (22 from 2010-2015 and 41 from 2016-2020). The most common RTS batteries included the hop test, quadriceps strength test, and patient-reported outcome measures. No study met all 7 AUC; the most common criteria met were functional skills (98.4%), followed by confidence (22.2%), then range of motion and knee stability (20.6%). CONCLUSION: The test batteries in the current literature show high variability and a lack of essential components necessary for RTS. No study met the AUC guidelines, suggesting a disconnect between recommended guidelines and clinical practice. Test battery research has expanded over the past decade; however, standardized, clinically applicable batteries that encompass all criteria are needed.

Psychological impairments in individuals with history of ankle sprain: a systematic review.

Patient-reported outcomes (PROs) can be used to assess and monitor psychological health following musculoskeletal injury. Studies have reported decreased psychological health after lateral ankle sprain (LAS) using numerous PROs. The purpose of this systematic review was to critically evaluate individual studies, summarize PROs utilized to quantify psychological health, and examine the effect of ankle injury on psychological health between groups (1 LAS, >1 LAS, and healthy controls). Databases searched included: CINAHL, MEDLINE, SPORTDiscus, APA, Psychinfo and PubMed Central. All case-control studies were critically appraised using the modified Downs and Black. Effect sizes (ES) were calculated between the groups (1 LAS, >1 LAS, healthy control) for each of the identified studies, for each included PRO used to quantify psychological impairments. Nine high-quality manuscripts were included. Overall, individuals with history of > 1 LAS self-reported greater psychological impairments compared to healthy controls (ES range = -0.37-12.16), while those with 1 LAS had similar psychological health to healthy control groups (ES rang e = -0.65-0.65). Conclusion: The main findings from this systematic review were individuals with > 1 LAS have increased levels of injury-related fear and decreased psychological health compared to healthy controls. PROs can aid clinicians in identifying psychological health concerns during rehabilitation.

Isometric Hip Strength and Patient-Reported Outcomes of Individuals With and Without Chronic Ankle Instability.

CONTEXT: Strength deficits and decreased scores on generic, dimension-specific, and region-specific health-related quality of life (HRQL) PRO measures are commonly documented among individuals with chronic ankle instability (CAI). However, it is unknown if there is a relationship between hip strength and self-reported patient-reported outcome (PRO) scores. OBJECTIVE: To compare isometric peak torque for hip-extension (H-EXT) and hip-abduction (H-ABD), as well as PRO scores between CAI, lateral ankle sprain copers (LAS copers), and uninjured controls (UC). The secondary purpose was to examine the relationship between isometric hip peak torque and PROs in participants with CAI. DESIGN: Cross-sectional. SETTING: Laboratory. PARTICIPANTS: Sixty-three individuals, 45 women (23.02 [3.83] y, 165.91 [7.55] cm, 67.28 [11.95] kg) and 18 men (26.28 [5.43] y, 179.28 [9.01] cm, 83.87 [13.26] kg), grouped as uninjured control (n = 26), LAS coper (n = 15), or CAI (n = 22). MAIN OUTCOME MEASURES: The Foot and Ankle Ability Measure was used to assess region-specific HRQL. The Fear Avoidance Beliefs Questionnaire was used to assess injury-related fear. The Disablement in Physically Active was used to assess global HRQL. Isometric peak torque was measured with a handheld dynamometer for H-EXT and H-ABD. RESULTS: No group differences were observed for H-ABD (P = .34) or H-EXT (P = .35). The CAI group had significantly worse scores on all PROs compared with LAS coper (P < .001) and HC (P < .001). Moderate-weak correlations were found between H-ABD and Foot and Ankle Ability Measure-activities of daily living (P = .047; ρ = .392) and Foot and Ankle Ability Measure-Sport (P = .013; ρ = .482) and H- EXT and Fear Avoidance Beliefs Questionnaire-Work (P = .007; ρ = -.517). CONCLUSIONS: Individuals with CAI displayed lower HRQL based on worse scores on generic, dimension-specific, and region-specific PROs compared with LAS copers and uninjured controls. There were no significant between-group differences for H-EXT and H-ABD isometric peak torque production, but there was a moderate positive relationship between isometric H-ABD and self-reported ankle disability in individuals with CAI.

Implementation of In vivo exposure therapy to decrease injury-related fear in females with a history of ACL-Reconstruction: A pilot study.

OBJECTIVE: The objective of this pilot study was to examine the preliminary feasibility and efficacy of in vivo exposure therapy (IVET) to decrease injury-related fear in females with history of ACLR. DESIGN: Pilot Study. SETTING: Sports Medicine Research Laboratory. PARTICIPANTS: 12 female participants with history of ACLR (≥ 1 year post-operative) were randomized into a 5-week IVET group (n = 6) or 5-week sham physical activity (PA) monitoring group (n = 6). MAIN OUTCOME MEASURES: The independent variables were Group and Time. The dependent variables were the Photographic Series of Sports Activities for ACLR (PHOSA-ACLR) and the Tampa Scale of Kinesiophobia-11 (TSK-11) scores. A Group x Time repeated measures two-way analysis of variance was completed for the PHOSA-ACLR and the TSK-11. Partial η2 effect sizes were used to examine clinically meaningful differences. RESULTS: High retention and adherence rates were observed in the intervention group. The PHOSA-ACLR exhibited a significant main effect for Time (F1,10 = 9.92, p = 0.01, partial η2 = 0.50), but not for Group. No statistically significant or clinically meaningful differences were observed for the TSK-11. CONCLUSION: Both groups exhibited decreased injury-related fear for specific functional tasks. Future research should further examine the efficacy of IVET and PA monitoring to decrease injury-related fear in patients after ACLR.

The relationship between injury-related fear and physical activity in people with a history of anterior cruciate ligament reconstruction.

OBJECTIVE: The objective of this study was to examine the relationship between fear-avoidance beliefs and physical activity (PA) in people with a history of anterior cruciate ligament reconstruction (ACLR). DESIGN: Modified cross-sectional. SETTING: Research laboratory Participants: A total of 19 participants with a history of unilateral ACLR. MAIN OUTCOME MEASURES: Participants completed the Fear-Avoidance Beliefs Questionnaire (FABQ), a valid and reliable measure of FAB measured across two subscales (FABQ-Sport and FABQ-Physical Activity (PA)). Higher scores indicated greater FAB. The participants were provided a wearable accelerometer to wear on the wrist for one-week to capture PA outcomes (vertical counts per minute and average steps/day). RESULTS: Weak, non-statistically significant positive correlations were identified between average daily steps per day (11,237.7 ± 5667.7), FABQ-PA (6 ± 8; r = 0.12, p = .63) and FABQ-S (8 ± 15; r = 0.26, p = .35). Weak, non-statistically significant negative correlations were identified between vertical counts per minute (131.4 ± 141.4) and FABQ-PA (r = -0.13, p = .59) and no relationship was observed with FABQ-Sports (r = 0.00, p = .98). CONCLUSIONS: There were no significant relationships between FABs and PA. The ability for individuals to remain physically active, with measurable levels of FABs (greater than 0), may be due to other psychological variables that should be further examined.

Neuroplasticity in Corticolimbic Brain Regions in Patients After Anterior Cruciate Ligament Reconstruction.

CONTEXT: Fear has been cited as the primary barrier to return to sport (RTS) by athletes after anterior cruciate ligament reconstruction (ACLR). Understanding the neural factors that contribute to fear after ACLR may help us to identify interventions for this population. OBJECTIVE: To characterize the underlying neural substrate of injury-related fear in patients after ACLR versus healthy matched control individuals during a picture imagination task (PIT) consisting of sport-specific images and images of activities of daily living (ADL). DESIGN: Case-control study. SETTING: Research laboratory. PATIENTS OR OTHER PARTICIPANTS: A total of 24 right-hand-dominant participants (12 with left-sided ACLR and 12 control individuals) were enrolled. Participants underwent full-brain functional magnetic resonance imaging. MAIN OUTCOME MEASURE(S): Functional data were acquired using blood oxygen level-dependent (BOLD) echoplanar imaging. Independent t tests were conducted to identify between-groups differences in BOLD signal changes during all images of the PIT. Paired t tests were computed to examine differences in BOLD signal change between sport-specific and ADL images in the ACLR group. RESULTS: Increased activation in the inferior parietal lobule and the mediodorsal thalamus was observed during PIT in the ACLR group. An inability to suppress the default mode network in the ACLR group was noted. The ACLR group exhibited increased activation in the cerebellum and inferior occipital regions during the sport-specific images versus the ADL images, but no other regions of interest demonstrated differences. CONCLUSION: After ACLR, patients may be more predisposed to fear, anxiety, and pain during sport-specific activities and ADLs. Psychosocial interventions may be warranted after ACLR to reduce injury-related fear and mitigate potentially maladaptive neuroplasticity.

The Effectiveness of the Transtheoretical Model to Improve Physical Activity in Healthy Adults: A Systematic Review.

BACKGROUND: Despite the known risks of physical inactivity, only 50% of adults meet the recommended guidelines for physical activity (PA). Therefore, numerous interventions have been designed to increase PA across a lifespan. The purpose of this systematic review was to determine the effectiveness of interventions based on the transtheoretical model to improve PA in healthy adults. METHODS: Electronic databases (CINAHL, MEDLINE, Psychology & Behavioral Sciences Collection, PsycINFO, Sociological Collection, and SPORTDiscus) were systematically searched from January 2001 to May 2020. RESULTS: A total of 11 randomized pretest-posttest studies were included in this review. Ten studies utilized a subjective measurement of PA, and 3 studies included an objective measure. Five studies demonstrated significant improvements in PA for the transtheoretical model-based intervention groups compared with control/comparison groups; however, 6 studies demonstrated no differences between groups. CONCLUSION: The findings suggest that there is inconsistent evidence to support the use of interventions based on the transtheoretical model to improve PA in adult populations. Interventions were more successful when materials were delivered via in-person counseling and when study participants were in the precontemplation or contemplation phases at baseline.

The Reliability of an Upper- and Lower-Extremity Visuomotor Reaction Time Task.

CONTEXT: Fast visuomotor reaction time (VMRT), the time required to recognize and respond to sequentially appearing visual stimuli, allows an athlete to successfully respond to stimuli during sports participation, while slower VMRT has been associated with increased injury risk. Light-based systems are capable of measuring both upper- and lower-extremity VMRT; however, the reliability of these assessments are not known. OBJECTIVE: To determine the reliability of an upper- and lower-extremity VMRT task using a light-based trainer system. DESIGN: Reliability study. SETTING: Laboratory. Patients (or Other Participants): Twenty participants with no history of injury in the last 12 months. METHODS: Participants reported to the laboratory on 2 separate testing sessions separated by 1 week. For both tasks, participants were instructed to extinguish a random sequence of illuminated light-emitting diode disks, which appeared one at a time as quickly as possible. Participants were provided a series of practice trials before completing the test trials. VMRT was calculated as the time in seconds between target hits, where higher VMRT represented slower reaction time. MAIN OUTCOME MEASURES: Separate intraclass correlation coefficients (ICCs) with corresponding 95% confidence intervals (CIs) were calculated to determine test-retest reliability for each task. The SEM and minimal detectable change values were determined to examine clinical applicability. RESULTS: The right limb lower-extremity reliability was excellent (ICC2,1 = .92; 95% CI, .81-.97). Both the left limb (ICC2,1 = .80; 95% CI, .56-.92) and upper-extremity task (ICC2,1 = .86; 95% CI, .65-.95) had good reliability. CONCLUSIONS: Both VMRT tasks had clinically acceptable reliability in a healthy, active population. Future research should explore further applications of these tests as an outcome measure following rehabilitation for health conditions with known VMRT deficits.