High School Female Soccer Players Research Articles

Eccentric Hamstring Strength Imbalance among Football and Soccer Athletes.

Hamstring strain injuries (HSI) are common among football and soccer athletes. Eccentric strength imbalance is considered a contributing factor for HSI. There is, however, a paucity of data on hamstring imbalances of soccer and American football athletes as they age and advance in skill level. High school athletes will display greater interlimb discrepancies compared with collegiate and professional athletes. In addition, soccer athletes will exhibit greater hamstring asymmetry than American football athletes. Hamstring testing was performed on soccer and American football athletes using the NordBord Hamstring Testing System (Vald Performance, Albion, Australia). Age, sex, weight, sport specialization, and sport level were recorded. Maximum hamstring forces (N), torque (N · m), and work (N · s) were measured. Hamstring imbalance (%) was calculated by dividing the absolute value of the difference in leg forces divided by their sum. One-way analysis of variance and independent sample t tests compared measurements between athlete groups. A total of 631 athletes completed measurements, including 88 high school male soccer, 25 college male soccer, 23 professional male soccer, 83 high school female soccer, 28 college female soccer, 288 high school football, and 96 college football athletes. High school soccer players displayed significantly greater imbalances for torque (P = 0.03) and work (P < 0.01) than football athletes. Imbalances for maximum force (P = 0.035), torque (P = 0.018), and work (P = 0.033) were significantly higher for male soccer athletes in high school compared with college- and professional-level athletes. Female high school soccer players had significantly higher imbalance in torque (P = 0.045) and work (P = 0.001) compared with female collegiate soccer players. Football athletes did not experience significant changes in force imbalances between skill levels. High school soccer athletes exhibit greater hamstring imbalances than football athletes. Higher levels of play in soccer, for both male and female athletes, correlate with less hamstring asymmetry.

Concussion history and virtual reality metrics predict core or lower extremity injury occurrence among high school athletes.

A history of concussion is recognized as a risk factor for musculoskeletal injury, which is likely associated with physiological effects that warrant better understanding. This study aimed to assess the potential of measurements obtained from an immersive virtual reality (VR) test to identify a subtle perceptual-motor impairment that may be prospectively associated with the occurrence of a core or lower extremity sprain or strain. A cohort of 68 high school athletes (41 female soccer players and 27 male football players) provided survey responses and completed an immersive VR test several days prior to the initiation of preseason practice sessions. Measurements of eye, neck, arm, and whole-body displacements were obtained during 40 successive lunging/reaching responses to visual stimuli moving horizontally across the VR headset display. Injury occurrences were electronically documented from the initial preseason practice session to the final game of the season. A statistically significant and intrinsically credible two-factor prediction model for core or lower extremity injury occurrence included an interaction between female sex and a self-reported history of two or more concussions, along with slow response time (RT) for arm reach (OR = 4.67; 95% CI, 1.51-14.43). Follow-up analyses identified sex-specific cut points for arm reach RT associated with elevated injury risk, which were ≥1.385 s for females and ≥1.257 s for males. High school female soccer players who have sustained more than one concussion appear to be highly vulnerable to core or lower extremity sprain or strain, with the risk of injury compounded by a slow arm reach RT. Male football players as a group demonstrated significantly faster arm reach RT than that of female soccer players, but slow perceptual-motor RT for arm reach was also identified as a potentially important injury risk factor for male players. Immersive VR appears to provide precise measurements of behavioral performance characteristics that depend on brain processing efficiency. Given that the speed, accuracy, and consistency of perceptual-motor responses may be modifiable, future research should explore the potential benefits of VR training for reducing the risk of sport-related injuries.

High magnitude exposure to repetitive head impacts alters female adolescent brain activity for lower extremity motor control

Contact and collision sport participation among adolescent athletes has raised concerns about the potential negative effects of cumulative repetitive head impacts (RHIs) on brain function. Impairments from RHIs and sports-related concussions (SRC) may propagate into lingering neuromuscular control. However, the neural mechanisms that link RHIs to altered motor control processes remain unknown. The purpose of this study was to isolate changes in neural activity for a lower extremity motor control task associated with the frequency and magnitude of RHI exposure. A cohort of fifteen high school female soccer players participated in a prospective longitudinal study and underwent pre- and post-season functional magnetic resonance imaging (fMRI). During fMRI, athletes completed simultaneous bilateral ankle, knee, and hip flexion/extension movements against resistance (bilateral leg press) to characterize neural activity associated with lower extremity motor control. RHI data were binned into continuous categories between 20 g − 120 g (defined by progressively greater intervals), with the number of impacts independently modeled within the fMRI analyses. Results revealed that differential exposure to high magnitude RHIs (≥90 g - < 110 g and ≥ 110 g) was associated with acute changes in neural activity for the bilateral leg press (broadly inclusive of motor, visual, and cognitive regions; all p < 0.05 & z > 3.1). Greater exposure to high magnitude RHIs may impair lower extremity motor control through maladaptive neural mechanisms. Future work is warranted to extend these mechanistic findings and examine the linkages between RHI exposure and neural activity as it relates to subsequent neuromuscular control deficits.

Decreases in Performance Observed After COVID-19 Infection in High School Female Soccer Players

This case report retrospectively reviewed competition sprinting performances by a cohort of eight female high school soccer players before and after the incidence of coronavirus 2019 (COVID-19). Performances were split into COVID-19-positive and COVID-19-negative groups, and metrics were collected using a global positioning system for each player during each game. An apparent decrease of 21.13% was found in the COVID-19-positive group’s performances in distance sprinted per game in contrast to an increase of 8.43% for the COVID-19-negative group’s performances. Results suggest patient-athletes experience decreases in intense sprinting performances following COVID-19 infection.

Preliminary Report on the Train the Brain Project, Part I: Sensorimotor Neural Correlates of Anterior Cruciate Ligament Injury Risk Biomechanics.

Anterior cruciate ligament injury commonly occurs via noncontact motor coordination errors that result in excessive multiplanar loading during athletic movements. Preventing motor coordination errors requires neural sensorimotor integration activity to support knee-joint neuromuscular control, but the underlying neural mechanisms driving injury-risk motor control are not well understood. To evaluate brain activity differences for knee sensorimotor control between athletes with high or low injury-risk mechanics. Case-control study. Research laboratory. Of 38 female high school soccer players screened, 10 were selected for analysis based on magnetic resonance imaging compliance, injury-risk classification via 3-dimensional biomechanics during a drop vertical jump, and matching criteria to complete neuroimaging during knee motor tasks. Peak knee-abduction moment during landing was used for group allocation into the high (≥21.74 newton meters [Nm], n = 9) or low (≤10.6 Nm, n = 11) injury-risk classification (n = 11 uncategorized, n = 7 who were not compliant with magnetic resonance imaging). Ten participants (5 high risk, 5 low risk) with adequate data were matched and compared across 2 neuroimaging paradigms: unilateral knee-joint control and unilateral multijoint leg press against resistance. Athletes with high injury-risk biomechanics had less neural activity in 1 sensory-motor cluster for isolated knee-joint control (precuneus, peak Z score = 4.14, P ≤ .01, 788 voxels) and greater brain activity for the multijoint leg press in 2 cognitive-motor clusters: the frontal cortex (peak Z score = 4.71, P < .01, 1602 voxels) and posterior cingulate gyrus (peak Z score = 4.43, P < .01, 725 voxels) relative to the low injury-risk group. The high injury-risk group's lower relative engagement of neural sensory resources controlling the knee joint may elevate demand on cognitive motor resources to control loaded multijoint action. The neural activity profile in the high injury-risk group may manifest as a breakdown in neuromuscular coordination, resulting in elevated knee-abduction moments during landing.

NEURAL ACTIVITY AND LANDING BIOMECHANICS: EXPLORING THE RELATIONSHIPS BETWEEN THE BRAIN, BODY, AND ACL INJURY-RISK

Background:Anterior cruciate ligament (ACL) injuries predominantly occur via non-contact mechanisms, secondary to motor coordination errors resulting in aberrant frontal plane knee loads that exceed the thresholds of ligament integrity. However, central nervous system processing underlying high injury-risk motor coordination errors remain unknown, limiting the optimization of current injury reduction strategies.Purpose:To evaluate the relationships between brain activity during motor tasks with injury-risk loading during a drop vertical jump.Methods:Thirty female high school soccer players (16.10 ± 0.87 years, 165.10 ± 4.64 cm, 63.43 ± 8.80 kg) were evaluated with 3D biomechanics during a standardized drop vertical jump from a 30 cm box and peak knee abduction moment was extracted as the injury-risk variable of interest. A neuroimaging session to capture neural activity (via blood-oxygen-level-dependent signal) was then completed which consisted of 4 blocks of 30 seconds of repeated bilateral leg press action paced to a metronome beat of 1.2 Hz with 30 seconds rest between blocks. Knee abduction moment was evaluated relative to neural activity to identify potential neural contributors to injury-risk.Results:There was a direct relationship between increased landing knee abduction moment and increased neural activation within regions corresponding to the lingual gyrus, intracalcarine cortex, posterior cingulate cortex, and precuneus (r2= 0.68, p corrected < .05, z max > 3.1; Table 1 & Figure 1).Conclusion:Elevated activity in regions that integrate sensory, spatial, and attentional information may contribute to elevated frontal plane knee loads during landing. Interestingly, a similar activation pattern related to high-risk landing mechanics has been found in those following injury, indicating that predisposing factors to injury may be accentuated by injury or that modern rehabilitation does not recover prospective neural control deficits. These data uncover a potentially novel brain marker that could guide the discovery of neural-therapeutic targets that reduce injury risk beyond current prevention methods.Figure 1:The drop vertical jump landing assessment (left) and neural activity associated with abduction loading (right).

NEURAL ACTIVITY PROFILES ASSOCIATED WITH ACL INJURY-RISK MECHANICS IN ECOLOGICAL SPORT SPECIFIC VIRTUAL REALITY

Background:Anterior cruciate ligament (ACL) injury is secondary to a multifactorial etiology encompassing anatomical, biological, mechanical, and neurological factors. The nature of the injury being primarily due to non-contact mechanics further implicates neural control as a key injury-risk factor, though it has received considerably less study.Purpose:To determine the contribution of neural activity to injury-risk mechanics in ecological sport-specific VR landing scenarios.Methods:Ten female high-school soccer players (15.5±0.85 years; 165.0±6.09 cm; 59.1±11.84 kg) completed a neuroimaging session to capture neural activity during a bilateral leg press and a 3D biomechanics session performing a header within a VR soccer scenario. The bilateral leg press involved four 30 s blocks of repeated bilateral leg presses paced to a metronome beat of 1.2 Hz with 30 s rest between blocks. The VR soccer scenario simulated a corner-kick, requiring the participant to jump and head a virtual soccer ball into a virtual goal (Figure 1A-E). Initial contact and peak knee flexion and abduction angles were extracted during the landing from the header as injury-risk variables of interest and were correlated with neural activity.Results:Evidenced in Table 1 and Figure 1 (bottom row), increased initial contact abduction, increased peak abduction, and decreased peak flexion were associated with increased sensory, visual-spatial, and cerebellar activity (r2= 0.42-0.57, p corrected < .05, z max > 3.1, table & figure 1). Decreased initial contact flexion was associated with increased frontal cortex activity (r2= 0.68, p corrected < .05, z max > 3.1).Conclusion:Reduced neural efficiency (increased activation) of key regions that integrate proprioceptive, visual-spatial, and neurocognitive activity for motor control may influence injury-risk mechanics in sport. The regions found to increase in activity in relation to higher injury-risk mechanics are typically activated to assist with spatial navigation, environmental interaction, and precise motor control. The requirement for athletes to increase their activity for more basic knee motor control may result in fewer neural resources available to maintain knee joint alignment, allocate environmental attention, and handle increased motor coordination demands. These data indicate that strategies to enhance efficiency of visual-spatial and cognitive-motor control during high demand sporting activities is warranted to improve ACL injury-risk reduction.Figure 1The virtual reality soccer landing scenario (A, C, E: first person perspective in virtual reality; B, D: articipant wearing the virtual reality headset from an external perspective) and neural activity associated with abduction mechanics (bottom‐left) and flexion mechanics (bottom‐right)

Head acceleration event metrics in youth contact sports more dependent on sport than level of play.

The goal of the study was to evaluate how repetitive head traumas sustained by athletes in contact sports depend on sport and level of play. A total of 16 middle school football players, 107 high school football players, and 65 high school female soccer players participated. Players were separated into levels of play: middle school (MS), freshman (FR), junior varsity (JV), junior varsity-varsity (JV-V), and varsity (V). xPatch sensors were used to measure peak translational and angular accelerations (PTA and PAA, respectively) for each head acceleration event (HAE) during practice and game sessions. Data were analyzed using a custom MATLAB program to compare metrics that have been correlated with functional neurological changes: session metrics (median HAEs per contact session), season metrics (total HAEs, cumulative PTA/PAA), and regressions (cumulative PTA/PAA versus total HAEs, total HAEs versus median HAEs per contact session). Football players had greater session (p<.001) and season (p<.001) metrics than soccer players, but soccer players had a significantly greater player average PAA per HAE than football players (p<.001). Middle school football players had similar session and season metrics to high school level athletes. In conclusion, sport has a greater influence on HAE characteristics than level of play.

중·고등학교 여자축구 선수들의 팀요인 및 진로결정수준 차이 : 학교급 및 팀성적을 중심으로

Purpose: The purpose of this study is to examine the differences in career decision-making and team factors (e.g., performance improvement, team achievement, and team satisfaction) among middle and high school female soccer players. It is also to discuss the requirements necessary for them to continue their athletic careers. The study aims to provide basic data for the development of youth women’s soccer too.<BR> Method: Four hundred and seventy-eight questionnaires collected from female secondary school soccer teams distributed across the country were used for statistical analysis. Two MANOVAs were used to answer the proposed research questions in the study.<BR> Results: The key findings are as follows. First, middle school female soccer players had higher performance improvement, team achievement, and team satisfaction than their high school counterparts. Second, there were significant differences in performance improvement, team achievement, team satisfaction, and career decision-making according to the team levels (e.g., upper, middle, and lower). The performance improvement, team satisfaction, and career decision-making were found to be higher in the upper teams than both the middle and lower teams, and team achievement was significantly higher in the order of upper, middle and lower levels respectively.<BR> Conclusion: The results that middle school players showed superior team factors compared to their high school counterparts seems to be related to high school players’ entering the next level (e.g., universities or professional teams). The players of the top-tier teams that secured a competitive advantage showed stronger career ability and higher team factors. This could be associated with the individual player’s desire to seek specialty and compensation.

Altered Functional and Structural Connectomes in Female High School Soccer Athletes After a Season of Head Impact Exposure and the Effect of a Novel Collar.

Background: Characterization of, and evaluation of strategies to mitigate, the effects of sub-concussive impacts (SCI) on brain structure and function are crucial to understanding potential long-term neurological risks associated with sports participation. Objectives: To evaluate the efficacy of a jugular vein compression collar for preserving functional and structural measures of brain network organization in a cohort of female high school soccer players throughout a season of competitive play. Methods: Athletes were assigned to a collar (N = 72) or non-collar (N = 56) group before engaging in a season of play, during which head impact data were recorded via accelerometer for every practice and competition. Participants completed neuroimaging sessions before and following the season. A graph theoretical framework was applied to the functional and structural connectivity measures computed from resting state functional magnetic resonance imaging (rs-fMRI) and diffusion tensor imaging (DTI) data. Results: Non-collar-wearing athletes exhibited significantly increased rs-fMRI-derived global clustering coefficients (p = 0.032) and DTI-derived modularity (p = 0.042), compared to collar-wearing athletes. No longitudinal changes in any graph measures were observed for the collar group (p > 0.05). Conclusion: The observed increase in graph measures in the non-collar group is congruent with previous studies of SCI and is similar to graph theoretical studies of traumatic brain injury. The absence of alterations in graph metrics in the collar group indicates a potential ameliorating effect of the collar device against network reorganization, in line with previous literature.

중국 하남성 고교 여자축구선수의 또래관계 및 사회적 행동의 관계

중국 하남성 고교 여자축구선수의 또래관계 및 사회적 행동의 관계

Acute Concussion Symptoms and Symptom Correlations of Male and Female High School Soccer Players

Acute Concussion Symptoms and Symptom Correlations of Male and Female High School Soccer Players

In-Game Head Impact Exposure of Male and Female High School Soccer Players

In-Game Head Impact Exposure of Male and Female High School Soccer Players

Correction: Evidence of Cognitive Dysfunction after Soccer Playing with Ball Heading Using a Novel Tablet-Based Approach.

[This corrects the article DOI: 10.1371/journal.pone.0057364.].

The Effect of a Concurrent Strength and Conditioning Program in Female Soccer Players

BACKGROUND: Due to the high metabolic and physical demands involved in soccer, an optimal strength and conditioning program for female high school soccer players essential. The benefits of resistance training and high intensity interval training in young athletes has been well documented however, the effect of a concurrent strength and metabolic conditioning program on female athletes in specific sports has yet to be investigated. PURPOSE: To examine the effects of an 8-week concurrent strength and metabolic conditioning program on body composition, flexibility, speed, agility, anaerobic capacity, strength, and power in female soccer players. METHODS: Body composition and performance testing measures were recorded in female soccer players (n = 14, age = 16 ± 1.0 yrs) before and after an 8-week sports performance camp that combined concurrent high intensity interval training methods and periodized resistance training. Performance testing included 3-site skinfolds, sit and reach, pro agility test, 40yd sprint, 300yd shuttle run, and vertical jump. Strength testing included a 5-repetition maximum back squat, shoulder press, and bench press, and a 3-repetition maximum power clean. Comparisons were made using a paired samples t-test, and Pearson’s correlations between variables were calculated. RESULTS: Significant improvements were made in vertical jump (p <0.05), pro agility test (p < 0.05), 40yd sprint (p < 0.05), squat (p < 0.05), shoulder press (p < 0.05), bench press (p < 0.05), and power clean (p < 0.05). There were significant correlations between increases in power with agility and speed, as well as correlations between power and strength. CONCLUSION: An 8-week concurrent strength and conditioning program was effective for improving measures of fitness and performance in female soccer players. Overall, power and strength increased, as well as a significant decrease in time to complete the agility and speed testing.

Lack of eye discipline during headers in high school girls soccer: A possible mechanism for increased concussion rates

The sport of soccer is the fastest growing and most popular sport worldwide. With this growth and popularity, attention needs to be given to this athletic population. Sports related concussions is a topic that has gained attention both in the media and by governmental organizations, with growing initiatives in diagnosis, prevention and treatment. The act of soccer heading is thought to contribute to increased concussion incidence. Current evidence reveals that within the high school soccer athletic population, female athletes incur a higher concussion rate than males. This is often attributed to many things including differing cervical spinal musculature, skull thickness, etc., but a definitive reason has not yet been found. Other behaviors, such as field awareness and eye discipline™ on the field of play, may also be contributing factors that result in females incurring a greater concussion rate than males. For the purposes of this paper we define eye discipline™ as the ability to keep the eyes engaged in sporting activity with high risk potential.We present our hypothesis that high school female soccer players are more likely to have their eyes closed when in position for heading the ball as compared to high school male soccer players and this lack of visual awareness may increase the risk of concussion. Should these differences be substantiated between males and females, it may initiate and promote discussion of the need for vision training in the high school athletic setting. As a tool for injury prevention, vision training may improve specific visual parameters improving athletes’ abilities to process the field of play and prepare for or avoid injury causing situations. Through ocular motor and visual conditioning, an athlete may become more eye disciplined™, and more likely to have their eyes open during heading of the ball, and more likely to avoid concussions.

Female adolescent soccer players' perceived motivational climate, goal orientations, and mindful engagement

The purpose of this study was to examine two objectives: a) a moderation effect of task orientation in the predictive relationship of ego orientation to mindful engagement, and b) the mediational role of female high school soccer players' mindful engagement in the relationship between their perceptions of a caring/task-involving climate and task orientation to their practice strategy use and ability to peak under pressure. Athletes (N = 190, Mage = 15.59) completed measures of aforementioned psychometric variables. The moderation analysis revealed that athletes' task orientation and their mindful engagement were in a positive and significant liner relationship. The final mediation model results suggest that both female high school soccer athletes' mindful engagement and practice strategy use mediate the relationship of their perceptions of a caring/task-involving climate and goal orientations to their ability to peak under pressure. Results suggest that coaches' efforts to create a caring/task-involving climate in sport may help athletes be more task oriented and mindfully engaged in their sport, and thus experience more positive outcomes.

Epidemiology of injuries in female high school soccer players.

Sport is a compulsory activity in schools in South Africa. Female learners participating in soccer are more vulnerable to injuries than males. This study determined the epidemiology of injuries in female high school soccer players. A cross sectional survey captured the epidemiology of injuries in the players. The population included 200 players from 27 high schools in one district between the ages of 14 to 19 years. A self-administered questionnaire was used to collect data. Only 85 scholars from 8 schools participated. From the 85 respondents, 31 (36.5%) sustained injuries. Only 61 injuries were reported by the injured players. The injury prevalence for the season was 36.5%. The rate of injury was 90 per 1000 athlete exposure hours during the season. The defenders and midfielders sustained the most injuries. Most injuries reported were contact in nature. More injuries occurred during training than during matches. The lower extremity (77.8%) was injured more than the upper extremity (22.2%). The knee (22.2%) and ankle (15.9%) were the most frequently injured body parts. Muscle injury was the most commonly reported followed by bruising. Prevalence of injuries was high with the lower limb, specifically the knee and ankle being commonly injured.

An Innovative Approach to Decreasing Concussions in Adolescent Female Soccer Athletes

Concussion is a public health issue, fundamental to health promotion and injury prevention. Concussions are prevalent in adolescent athletic competition, in high-collision and non-collision sports. A history of previous concussion increases risk by a factor of three, female gender increases it 1.5 to 2.5 times, and female middle-school soccer players have 22.9 times increased risk during games. Non-collision concussions (indirect) may be primed by altered movement patterns from previous injuries, disruption of cervical proprioception, or musculoskeletal pain. Assessment of dynamic balance and functional movement allows identification of poor movement patterns or control. PURPOSE: To assess a preventative movement-based warm-up routine designed to re-set aberrant afferent information from various systems (vestibular, somatic, ocular) for a cohort of high school female soccer players with prior concussions. METHODS: A retrospective cohort study of convenience consisting of 17 Virginian high school female soccer athletes ages 15 to 18 during 2013-2014 season. Three players had suffered a concussion within the last 6 to 8 months. Athletes were assessed pre-season using the Lower Quarter Y-balance test (LQ-YBT) and the Functional Movement Screen (FMS). Cohort was instructed in a general warm-up placing emphasis on normalizing movement patterns (identified via the YBT and FMS), vestibular ocular reflex, and ACL-prevention exercises, which was performed during the entire season before practices and games. RESULTS: Sixteen varsity high school female soccer athletes, ages 14 to 18 years, participated. The average FMS composite score was 15±2, with 2 athletes being below the injury risk score of 14, and another 3 scoring right at the cutoff. The difference from side to side for the composite LQ-YBT ranged from 5 - 8cm. A total of 10 athletes had differences, with 6 of the athletes had an anterior difference of ≥4cm, and 6 had a posterior difference of ≥6cm. These levels are predictive of a deficit in dynamic balance. There were no new, or repeat concussions during the soccer season. CONCLUSIONS: The finding of no new or repeat concussions, suggests that the intervention may have helped and may indicate a new injury prevention paradigm.

Evidence of Cognitive Dysfunction after Soccer Playing with Ball Heading Using a Novel Tablet-Based Approach

Does frequent head-to-ball contact cause cognitive dysfunctions and brain injury to soccer players? An iPad-based experiment was designed to examine the impact of ball-heading among high school female soccer players. We examined both direct, stimulus-driven, or reflexive point responses (Pro-Point) as well as indirect, goal-driven, or voluntary point responses (Anti-Point), thought to require cognitive functions in the frontal lobe. The results show that soccer players were significantly slower than controls in the Anti-Point task but displayed no difference in Pro-Point latencies, indicating a disruption specific to voluntary responses. These findings suggest that even subconcussive blows in soccer can result in cognitive function changes that are consistent with mild traumatic brain injury of the frontal lobes. There is great clinical and practical potential of a tablet-based application for quick detection and monitoring of cognitive dysfunction.