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Your search keyword '"BLACKBURN, J. TROY"' showing total 633 results
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633 results on '"BLACKBURN, J. TROY"'

9. An Acute Bout of Whole-Body Vibration Does Not Improve Jumping Performance in Those With Anterior Cruciate Ligament Reconstruction.

Author

Dewig, Derek R., Lepley, Adam S., Nilius, Alex, Padua, Darin A., Pietrosimone, Brian G., Wikstrom, Erik A., and Blackburn, J. Troy

Subjects
QUADRICEPS muscle physiology, WHOLE-body vibration, REPEATED measures design, BIOMECHANICS, STATISTICAL power analysis, ANTERIOR cruciate ligament surgery, T-test (Statistics), DATA analysis, RESEARCH funding, CLINICAL trials, STATISTICAL sampling, ISOMETRIC exercise, PAIRED comparisons (Mathematics), DESCRIPTIVE statistics, CROSSOVER trials, CONTROL groups, PRE-tests & post-tests, STATISTICS, ATHLETIC ability, BODY movement, JUMPING, EXERCISE tests, COMPARATIVE studies, CONFIDENCE intervals, MUSCLE contraction
Abstract

Individuals with anterior cruciate ligament reconstruction (ACLR) often fail to return to their previous level of sport performance. Although multifaceted, this inability to regain preinjury performance may be influenced by impaired plyometric ability attributable to chronic quadriceps dysfunction. Whole-body vibration (WBV) acutely improves quadriceps function and biomechanics after ACLR, but its effects on jumping performance outcomes such as jump height, the reactive strength index (RSI), and knee work and power are unknown. To evaluate the acute effects of WBV on measures of jumping performance in those with ACLR. Crossover study design. Research laboratory. Thirty-six individuals with primary, unilateral ACLR. Participants stood on a WBV platform in a mini-squat position while vibration or no vibration (control) was applied during six 60-second bouts with 2 minutes of rest between bouts. Double-leg jumping tasks were completed preintervention and postintervention (WBV or control) and consisted of jumping off a 30-cm box to 2 force plates half the participant's height away. The jumping task required participants to maximally jump vertically upon striking the force plates. Whole-body vibration did not produce significant improvements in any of the study outcomes (ie, jump height, RSI, and knee work and power) in either limb (P =.053–.839). These results suggest that a single bout of WBV is insufficient for improving jumping performance in individuals with ACLR. As such, using WBV to acutely improve jumping performance post-ACLR is likely not warranted. Future research should evaluate the effects of repeated exposure to WBV in combination with other plyometric interventions on jumping performance. [ABSTRACT FROM AUTHOR]

Published
2024
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24. Arthrogenic Muscle Inhibition Following Anterior Cruciate Ligament Injury.

Author

Pietrosimone, Brian, Lepley, Adam S., Kuenze, Christopher, Harkey, Matthew S., Hart, Joseph M., Blackburn, J. Troy, and Norte, Grant

Subjects
MUSCLE contraction, NEURAL pathways, ANTERIOR cruciate ligament, FUNCTIONAL status, GAIT in humans, BLOOD flow restriction training, SURGICAL complications, HEALTH outcome assessment, BIOFEEDBACK training, ANTERIOR cruciate ligament injuries, OSTEOARTHRITIS, MUSCLE strength, QUADRICEPS muscle, DIAGNOSIS, VIBRATION (Mechanics), BIOMECHANICS, JUMPING, DISEASE risk factors
Abstract

Arthrogenic muscle inhibition (AMI) is a common impairment in individuals who sustain an anterior cruciate ligament (ACL) injury. The AMI causes decreased muscle activation, which impairs muscle strength, leading to aberrant movement biomechanics. The AMI is often resistant to traditional rehabilitation techniques, which leads to persistent neuromuscular deficits following ACL reconstruction. To better treat AMI following ACL injury and ACL reconstruction, it is important to understand the specific neural pathways involved in AMI pathogenesis, as well as the changes in muscle function that may impact movement biomechanics and long-term structural alterations to joint tissue. Overall, AMI is a critical factor that limits optimal rehabilitation outcomes following ACL injury and ACL reconstruction. This review discusses the current understanding of the: (1) neural pathways involved in the AMI pathogenesis following ACL injury; (2) consequence of AMI on muscle function, joint biomechanics, and patient function; and (3) development of posttraumatic osteoarthritis. Finally, the authors review the evidence for interventions specifically used to target AMI following ACL injury. [ABSTRACT FROM AUTHOR]

Published
2022
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25. SUSTAINED LIMB‐LEVEL LOADING: A GROUND REACTION FORCE PHENOTYPE COMMON TO INDIVIDUALS AT HIGH‐RISK FOR AND THOSE WITH KNEE OSTEOARTHRITIS

Author

Bjornsen, Elizabeth, primary, Berkoff, David, additional, Blackburn, J. Troy, additional, Davis‐Wilson, Hope, additional, Evans‐Pickett, Alyssa, additional, Franz, Jason R., additional, Harkey, Matthew S., additional, Horton, W. Zachary, additional, Lisee, Caroline, additional, Luc‐Harkey, Brittney, additional, Munsch, Amanda E., additional, Nissman, Daniel, additional, Pfeiffer, Steven, additional, and Pietrosimone, Brian, additional

Published
2023
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28. Sustained Limb‐Level Loading: A Ground Reaction Force Phenotype Common to Individuals at High Risk for and Those With Knee Osteoarthritis.

Author

Bjornsen, Elizabeth, Berkoff, David, Blackburn, J. Troy, Davis‐Wilson, Hope, Evans‐Pickett, Alyssa, Franz, Jason R., Harkey, Matthew S., Horton, W. Zachary, Lisee, Caroline, Luc‐Harkey, Brittney, Munsch, Amanda E., Nissman, Daniel, Pfeiffer, Steven, and Pietrosimone, Brian

Subjects
KNEE osteoarthritis, BIOMECHANICS, CROSS-sectional method, ANTERIOR cruciate ligament surgery, BODY weight, DIAGNOSIS, GAIT in humans, DESCRIPTIVE statistics, RETROSPECTIVE studies, KNEE joint, GROUND reaction forces (Biomechanics), COMPARATIVE studies, PHYSICAL mobility
Abstract

Objective: The objective of this study was to compare the vertical (vGRF), anterior‐posterior (apGRF), and medial‐lateral (mlGRF) ground reaction force (GRF) profiles throughout the stance phase of gait (1) between individuals 6 to 12 months post–anterior cruciate ligament reconstruction (ACLR) and uninjured matched controls and (2) between ACLR and individuals with differing radiographic severities of knee osteoarthritis (KOA), defined as Kellgren and Lawrence (KL) grades KL2, KL3, and KL4. Methods: A total of 196 participants were included in this retrospective cross‐sectional analysis. Gait biomechanics were collected from individuals 6 to 12 months post‐ACLR (n = 36), uninjured controls matched to the ACLR group (n = 36), and individuals with KL2 (n = 31), KL3 (n = 67), and KL4 osteoarthritis (OA) (n = 26). Between‐group differences in vGRF, apGRF, and mlGRF were assessed in reference to the ACLR group throughout each percentage of stance phase using a functional linear model. Results: The ACLR group demonstrated lower vGRF and apGRF in early and late stance compared to the uninjured controls, with large effects (Cohen's d range: 1.35–1.66). Conversely, the ACLR group exhibited greater vGRF (87%–90%; 4.88% body weight [BW]; d = 0.75) and apGRF (84%–94%; 2.41% BW; d = 0.79) than the KL2 group in a small portion of late stance. No differences in mlGRF profiles were observed between the ACLR and either the uninjured controls or the KL2 group. The magnitude of difference in GRF profiles between the ACLR and OA groups increased with OA disease severity. Conclusion: Individuals 6 to 12 months post‐ACLR exhibit strikingly similar GRF profiles as individuals with KL2 KOA, suggesting both patient groups may benefit from targeted interventions to address aberrant GRF profiles. [ABSTRACT FROM AUTHOR]

Published
2024
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