Marc Norcross

Marc Norcross
Oregon State University | OSU · School of Biological and Population Health Sciences

PhD

About

72
Publications
16,865
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,282
Citations
Introduction

Publications

Publications (72)
Article
This study investigated the influences of explosive quadriceps strength and landing task on sagittal plane knee biomechanics. Forty female participants performed isometric knee extensions on a dynamometer and had lower extremity biomechanics assessed during double-leg jump-landings (DLJL) and single-leg jump-cuts (SLJC). Explosive quadriceps streng...
Article
Full-text available
Context Emerging evidence suggests that lower quadriceps rate of torque development (RTD) following anterior cruciate ligament reconstruction (ACLR) may be associated with altered landing mechanics. However, the influence of quadriceps RTD magnitude and RTD limb symmetry on landing mechanics limb symmetry remains unknown. Objective To assess the i...
Article
Full-text available
Lower explosive quadriceps strength, quantified as rate of torque development (RTD), may contribute to landing mechanics associated with anterior cruciate ligament (ACL) injury risk. However, the association between quadriceps RTD and landing mechanics during high demand tasks remains unclear. Therefore, this study investigated the influence of qua...
Article
Context The clinical practice of athletic training involves the daily application of public health (PH) principles and practices. In recent years, there has been an increased interest in understanding and promoting the intersections of athletic training and PH. Objective The primary objective of this article is to share the path taken by the Orego...
Conference Paper
Full-text available
Lesser quadriceps explosive strength, quantified as the rate of torque development (RTD), following ACL reconstruction may result in asymmetrical landing mechanics. Greater asymmetry in net internal knee moment at initial contact (KM at IC) has been reported to be associated with an increased risk of second ACL injury. However, no previous study ha...
Conference Paper
Statement of Purpose Emergency medical services (EMS) often respond to injuries sustained during team athletics and sports. The interval between injury and EMS arrival allows on-scene responders to provide immediate care. Methods/Approach We identified EMS runs associated with team or group sports (ICD-10 activity code Y93.6x), to a school or an a...
Article
Purpose A functional test battery (FTB) has been proposed to evaluate the readiness of return to activity after ACLR. However, there is limited evidence documenting the usefulness of an FTB. Therefore, the purpose of the current investigation was to compare knee joint landing biomechanics asymmetry during double-leg jump landing (DLJL) and single-l...
Article
Background Anterior cruciate ligament (ACL) injury prevention programs (IPPs) are generally accepted as being valuable for reducing injury risk. However, significant methodological limitations of previous meta-analyses raise questions about the efficacy of these programs and the extent to which meeting current best-practice ACL IPP recommendations...
Conference Paper
Full-text available
Context: A recent meta-analysis of meta-analyses (MAofMAs) concluded that ACL injury prevention programs (IPPs) reduce the risk of ACL injury by 50%. However, questions surround the validity of this risk reduction estimate given that the analysis did not exclude pooled data from studies using lower quality research designs- despite evidence that an...
Article
Full-text available
Background: Increasing athletic trainer (AT) services in high schools has attracted widespread interest across the nation as an effective instrument to manage injuries and improve children's health, but there is a lack of evidence on potential medical savings. Our study aimed to address this knowledge gap and provide evidence of AT impacts on medi...
Article
Context: Hiring athletic trainers (ATs) in high schools may lower medical payments by third-party payers such as Medicaid or commercial insurers by reducing injury risks or may increase medical payments due to more referrals to other health care providers. To date, evidence is lacking on the actual financial effect of high school ATs based on an a...
Conference Paper
Background Soccer and basketball have two of the highest rates of anterior cruciate ligament (ACL) injury among United States high school sports. The U.S. National Athletic Trainers’ Association (NATA) position statement on prevention of ACL injuries advises preventive training for soccer and basketball athletes – with a specific emphasis on female...
Conference Paper
Background Structured multicomponent injury prevention programs (IPP) are efficacious for reducing lower extremity (LE) injury risk in athletes, but are not commonly used by high school athletic team coaches in the United States. One barrier to structured IPP adoption is that many coaches report that they incorporate IPP activities into their team’...
Article
Experiential learning provides undergraduate students rich opportunities to enhance their knowledge of core concepts in kinesiology. Beyond these outcomes, it enables students to gain exposure to, build empathy for, and affect the lives of individuals from diverse populations. However, the development, management, and systematic evaluation of exper...
Article
Background: A functional test battery (FTB) has been proposed to determine return to full activity following anterior cruciate ligament reconstruction (ACLR). However, there is little biomechanical evidence of FTB usefulness. The purpose of this study was to compare knee joint landing and cutting biomechanics between ACLR patients who passed (ACLR-...
Article
Full-text available
Background Lower extremity injuries are common among runners. Recent trends in footwear have included minimal and maximal running shoe types. Maximal running shoes are unique because they provide the runner with a highly cushioned midsole in both the rearfoot and forefoot. However, little is known about how maximal shoes influence running biomechan...
Conference Paper
Context: While significant relationships between knee (KE) and ankle (AE) extensor rate of torque development (RTD) and vertical jump height have been identified, hip extensor (HE) RTD has not been associated with vertical jump performance. Though it was proposed that this might be due to the HE having a greater influence on horizontal versus verti...
Article
The objective was to determine estrogen's influence on control of a skeletal muscle through measurements of motorneuron excitability (H:M ratio) and presynaptic inhibition (PI). Estrogen serum concentrations were measured at menses and ovulation of female subjects and compared to male controls. Data was analyzed from 12 females and 13 males reporti...
Article
Numerous studies have investigated anterior cruciate ligament (ACL) injury risk by examining gender differences in knee and hip biomechanics during a side-step cutting manoeuvre since it is known that ACL injury often occurs during such a task. Recent investigations have also examined lower extremity (LE) biomechanics during side-step cutting in in...
Article
Full-text available
In the original publication the name of the fourth reviewer was incorrectly published.
Article
The use of a lower extremity injury prevention program by female soccer players before the completion of puberty may mitigate movement changes that develop during puberty and contribute to post-pubescent females’ greater anterior cruciate ligament-injury risk. It is unknown whether club soccer coaches are using injury prevention programs with young...
Article
To compare the maximum Hoffmann reflex (H-reflex) and the maximum M-wave (H : M) ratio of the H-reflex in men and women when all participants showed similar saliva levels of estradiol and progesterone. This is a cohort design study involving healthy men and women with a mean age of 22.4±3.4 years. The H : M ratio of the H-reflex was assessed in wom...
Article
Lower extremity injuries have immediate and long-term consequences. Lower extremity movement assessments can assist with identifying individuals at greater injury risk and guide injury prevention interventions. Movement assessments identify similar movement characteristics and evidence suggests large magnitude kinematic relationships exist between...
Conference Paper
Context: A Functional Test Battery (FTB) has been proposed to determine the readiness of patients for full activity following ACL reconstruction (ACLR). However, the knee joint landing biomechanics of ACLR patients who have passed (ACLR-Pass) or failed (ACLR-Fail) a FTB before and after exercise have not been investigated. Thus, it is difficult to...
Conference Paper
Context: Emerging evidence suggests that explosive strength of the quadriceps, quantified as the rate of torque development (RTD), is associated with sagittal plane knee kinematics related to ACL injury risk. Initial work from our laboratory indicates that healthy females with lesser quadriceps RTD land with lesser knee flexion angle at initial con...
Article
Background: Best practice recommendations for sports-related emergency preparation include implementation of venue-specific emergency action plans (EAPs), access to early defibrillation, and first responders-specifically coaches-trained in cardiopulmonary resuscitation and automated external defibrillator (AED) use. The objective was to determine...
Article
Objectives: Normalization of joint moments to reduce anthropometric influences prior to making group comparisons is a widely-accepted practice. However, a seminal prospective study reported greater non-normalized knee abduction moment (KAM) in nine females who subsequently sustained an ACL injury. It is not clear if this finding may have been infl...
Article
Objective: To introduce athletic trainers to the benefits of using a population-based approach to injury and illness prevention and to explore opportunities for partnering with public health professionals on these initiatives. Background: Athletic trainers play leading roles in individual injury and illness prevention but are less familiar with...
Article
Full-text available
Background: The relationships between hip abductor and extensor strength and frontal plane hip and knee motions that are associated with anterior cruciate ligament injury risk are equivocal. However, previous research on these relationships has evaluated relatively low-level movement tasks and peak torque rather than a time-critical strength measu...
Conference Paper
Context: The NATA encourages coaches to receive training in cardiopulmonary resuscitation (CPR), automated external defibrillator (AED) use, and first aid (FA) so they can provide emergency care (EC) for student-athletes until a medical professional arrives. AED availability at athletic venues is also essential as early defibrillation (<4 minutes)...
Article
Despite documented efficacy of injury prevention programs (IPPs) to reduce sport-related lower extremity injury risk, there is evidence of a lack of widespread IPP adoption by high school coaches. This study identified factors related to non-adoption of IPPs by assessing coaches' knowledge, attitudes, and behaviors related to prevention programs an...
Article
The purpose of the current study was to examine the relationships between maximum vertical jump height and 1) rate of torque development (RTD) calculated during two time intervals, 0-50ms (RTD50) and 0-200ms (RTD200) after torque onset; and 2) peak torque (PT) for each of the triple extensor muscle groups. Thirty recreationally active individuals p...
Article
Full-text available
During explosive movements and potentially injurious situations, the ability to rapidly generate torque is critical. Previous research has suggested that different phases of rate of torque development (RTD) are differentiately controlled. However, the extent to which supraspinal and spinal mechanisms predict RTD at different time intervals is unkno...
Article
Full-text available
Previous observations suggest that females utilize a more erect initial landing posture than males with sex differences in landing posture possibly related to sex-specific energy absorption (EA) strategies. However, sex-specific EA strategies have only been observed when accompanied by sex differences in initial landing posture. This study (a) inve...
Conference Paper
Context: Rate of torque development (RTD) is an indicator of muscle performance which quantifies the ability of an individual to generate joint torque during a specific time period. It is often calculated during the initial 50 and 200 milliseconds (ms) of isometric contraction in studies related to injury prevention and athletic performance, respec...
Article
The use of injury prevention programs (IPPs) during organized warm-up activities is encouraged to reduce lower extremity injury risk. However, the prevalence of structured IPP use by high school teams in Oregon is unknown. 1) Describe the warm-up practices of Oregon high school teams; and 2) evaluate if these behaviors are influenced by team access...
Article
Context: Greater hamstrings stiffness is associated with less anterior tibial translation during controlled perturbations. However, it is unclear how hamstrings stiffness influences anterior cruciate ligament (ACL) loading mechanisms during dynamic tasks. Objective: To evaluate the influence of hamstrings stiffness on landing biomechanics relate...
Article
Greater hamstring musculotendinous stiffness is associated with lesser ACL loading mechanisms. Stiffness is enhanced via training, but previous investigations evaluated tendon rather than musculotendinous stiffness, and none involved the hamstrings. We evaluated the effects of isometric and isotonic training on hamstring stiffness and ACL loading m...
Article
Full-text available
Context: Greater sagittal-plane energy absorption (EA) during the initial impact phase (INI) of landing is consistent with sagittal-plane biomechanics that likely increase anterior cruciate ligament (ACL) loading, but it does not appear to influence frontal-plane biomechanics. We do not know whether frontal-plane INI EA is related to high-risk fro...
Article
Full-text available
Context: Eccentric muscle actions of the lower extremity absorb kinetic energy during landing. Greater total sagittal-plane energy absorption (EA) during the initial impact phase (INI) of landing has been associated with landing biomechanics considered high risk for anterior cruciate ligament (ACL) injury. We do not know whether groups with differ...
Article
Full-text available
Background: Excessive trunk motion and deficits in neuromuscular control (NMC) of the lumbopelvic hip complex are risk factors for anterior cruciate ligament (ACL) injury. However, the relationship between trunk motion, NMC of the lumbopelvic hip complex, and triplanar knee loads during a sidestep cutting task has not been examined. Purpose: To...
Article
Context : Greater hamstrings stiffness is associated with less anterior tibial translation during controlled perturbations. However, it is unclear how hamstrings stiffness influences anterior cruciate ligament (ACL) loading mechanisms during dynamic tasks. Objective : To evaluate the influence of hamstrings stiffness on landing biomechanics related...
Article
The effects of hip muscle strength and activation on anterior cruciate ligament injury biomechanics, particularly knee valgus loading, have been reported in isolation and with equivocal results. However, the combination of these factors influences joint biomechanics. This investigation evaluated the influence of hip strength on gluteal activation a...
Article
Full-text available
To determine the effect of oral contraceptives (OC) on hamstring neuromechanics and lower extremity stiffness across the menstrual cycle (MC). Causal comparative. Research laboratory. Thirty, healthy, normally menstruating female volunteers who were using OC (OC group, n = 15) or not (non-OC group, n = 15). Stiffness and hamstring neuromechanics we...
Article
Full-text available
Hormonal fluctuations are one potential reason why females might have a greater rate of noncontact ACL injury. The hamstrings are capable of limiting anterior cruciate ligament (ACL) loading. This study examined whether relationships existed between reproductive hormones (estradiol-β-17, free testosterone, and progesterone) and hamstring neuromecha...
Article
Full-text available
A smaller amount of ankle-dorsiflexion displacement during landing is associated with less knee-flexion displacement and greater ground reaction forces, and greater ground reaction forces are associated with greater knee-valgus displacement. Additionally, restricted dorsiflexion range of motion (ROM) is associated with greater knee-valgus displacem...
Article
Excessive anterior tibial translation is a prospective risk factor for anterior cruciate ligament injury, thus factors which limit this motion may reduce injury risk. Stiffness quantifies a muscle's resistance to lengthening, and stiffer hamstrings may resist changes in length induced by anterior tibial translation more effectively. Anterior tibial...
Article
Fibular repositioning tape purportedly corrects the anterior fibular fault that often accompanies chronic ankle instability (CAI). Although anecdotal evidence suggests that fibular repositioning tape possesses clinical use, the associated mechanisms are unclear in patients with CAI. The purpose of this study was to evaluate the effects of fibular r...
Article
Full-text available
Gluteal musculature weakness is associated with lower extremity injury and greater frontal plane knee motion. A method for functionally evaluating hip abduction and external rotation strength by observing knee motion would be beneficial for clinicians. This study evaluated the association between hip abductor and external rotation strength and knee...
Article
Normalization of electromyographic (EMG) amplitudes is necessary in the study of human motion. However, there is a lack of agreement on the most reliable and appropriate normalization method. This study evaluated the reliability of single leg stance (SLS) and maximal voluntary isometric contraction (MVIC) normalization methods and the relationship...
Article
Background: Musculotendinous stiffness provides an estimate of resistance to joint perturbation, thus contributing to joint stability. Females demonstrate lesser hamstring stiffness than males, potentially contributing to the sex discrepancy in anterior cruciate ligament injury risk. However, it is unclear if the sex difference in hamstring stiffn...
Article
Full-text available
The hamstrings limit anterior cruciate ligament (ACL) loading, and neuromuscular control of these muscles is crucial for dynamic knee joint stability. Sex differences in electromechanical delay (EMD) and rate of force production (RFP) have been reported previously, and attributed to differences in musculotendinous stiffness (MTS). These characteris...
Article
Thesis (M.A.)--University of North Carolina at Chapel Hill, 2003. Includes bibliographical references. Microfiche.
Article
Thesis (M.A.)--University of North Carolina at Chapel Hill, 2003. Includes bibliographical references (leaves 64-66).

Network

Cited By