Abstract:
CONTEXT:Muscle fatigue is generally categorized in 2 ways: that caused by peripheral weakness (peripheral fatigue) and that caused by a progressive failure of voluntary neural drive (central fatigue). Numerous variables have been studied in conjunction with fatigue protocols, including postural stability, maximum voluntary contraction force, and reaction time. When torque recordings fall below 50% of a maximum voluntary contraction, the muscle is described as fatigued, but whether this value is a good indicator of fatigue has not been studied. OBJECTIVE:To compare the effects of 2 ankle musculature fatigue protocols (30% and 50%) on the duration of postural stability dysfunction. DESIGN:To assess differences between the 30% and 50% fatigue protocols, we calculated a 1 between-groups factor (subjects) and 2 within-groups factors (fatigue, test) analysis of variance. SETTING:E.J. Nutter Athletic Training Facility. PATIENTS OR OTHER PARTICIPANTS:Twenty subjects (10 men, 10 women; age = 21.15 +/- 2.23 years; height = 172.97 +/- 9.86 cm; mass = 70.62 +/- 14.60 kg) volunteered for this study. Subjects had no history of lower extremity injury, vestibular or balance disorders, functional ankle instability, or head injury in the past 6 months. INTERVENTION(S):On separate days, subjects performed isokinetic fatiguing contractions of the plantar flexors and dorsiflexors in a 30% protocol (70% decrease in strength) and a 50% protocol (50% decrease in strength). MAIN OUTCOME MEASURE(S):Baseline and postfatigue postural stability scores were determined before and after the isokinetic fatiguing contractions. Plantar-flexion peak-torque measurements were obtained for the 2 fatiguing protocols. Three prefatigue and 12 postfatigue postural stability trials were recorded. Velocities for testing were 60 degrees /s for plantar flexion and 120 degrees /s for dorsiflexion. RESULTS:Sway velocity was significantly greater when the ankle was fatigued to 30% (1.56 degrees /s) than in the 50% condition (1.36 degrees /s). For the 30% protocol, sway was significantly impaired when the pretest condition (1.19 degrees /s) was compared with posttest trial 1 (2.34 degrees /s), trial 2 (2.37 degrees /s), and trial 3 (1.71 degrees /s). For the 50% protocol, sway was significantly impaired when the pretest condition (1.27 degrees /s) was compared with posttest trial 1 (2.02 degrees /s). CONCLUSIONS:The 30% fatigue protocol resulted in significantly longer impairment of postural stability than the 50% protocol. Because the 30% protocol resulted in a greater effect but was relatively short-lived (approximately 75 to 90 s), it is more useful for research purposes.
journal_name
J Athl Trainjournal_title
Journal of athletic trainingauthors
Harkins KM,Mattacola CG,Uhl TL,Malone TR,McCrory JLkeywords:
subject
Has Abstractpub_date
2005-07-01 00:00:00pages
191-4issue
3eissn
1062-6050issn
1938-162Xjournal_volume
40pub_type
杂志文章abstract:CONTEXT:Ankle injuries are common at all levels of American football, and retired National Football League (NFL) players have a high prevalence of osteoarthritis (OA), but little is known about how ankle injuries influence OA prevalence and daily activities in this population or how surgical interventions for such inju...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-421-18
更新日期:2019-11-01 00:00:00
abstract:CONTEXT:Knee-valgus motion is a potential risk factor for certain lower extremity injuries, including anterior cruciate ligament injury and patellofemoral pain. Identifying neuromuscular characteristics associated with knee-valgus motion, such as hip and lower leg muscle activation, may improve our ability to prevent l...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-47.5.10
更新日期:2012-09-01 00:00:00
abstract::While the high school setting holds the best promise of employment for the recently certified athletic trainer, most student athletic trainers do not spend time working with the secondary school athlete. The athletic trainer must be aware of the stages of adolescent psychological maturity and be sensitive to the athle...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:1993-04-01 00:00:00
abstract:OBJECTIVE:To review 16 years of National Collegiate Athletic Association (NCAA) injury surveillance data for men's football and identify potential areas for injury prevention initiatives. BACKGROUND:Football is a high-velocity collision sport in which injuries are expected. Football tends to have one of the highest in...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:2007-04-01 00:00:00
abstract:CONTEXT:Recent research in the health care professions has shown that specific personal and environmental characteristics can predict burnout, which is a negative coping strategy related to stressful situations. Burnout has been shown to result in physiologic (eg, headaches, difficulty sleeping, poor appetite), psychol...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-44.1.58
更新日期:2009-01-01 00:00:00
abstract:CONTEXT:Active muscle stiffness might protect the unstable shoulder from recurrent dislocation. OBJECTIVE:To compare strength and active stiffness in participants with unilateral anterior shoulder instability and to examine the relationship between active stiffness and functional ability. DESIGN:Cross-sectional study...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-46.6.642
更新日期:2011-11-01 00:00:00
abstract::OBJECTIVE: To compare the effectiveness of Nature's Chemist as an ultrasound coupling agent with the effectiveness of another topical analgesic (Biofreeze), Aquasonic 100, and a sham treatment in producing intramuscular (IM) temperature increase during a typical therapeutic ultrasound treatment. DESIGN AND SETTING: Su...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:2001-03-01 00:00:00
abstract:CONTEXT:Therapeutic exercise programs that incorporate real-time feedback have been reported to enhance outcomes in patients with lower extremity joint injuries. The Wii Fit has been purported to improve balance, strength, flexibility, and fitness. OBJECTIVE:To determine the effects of Wii Fit rehabilitation on postur...
journal_title:Journal of athletic training
pub_type: 杂志文章,随机对照试验
doi:10.4085/1062-6050-48.2.04
更新日期:2013-05-01 00:00:00
abstract:CONTEXT:The ratio of clinicians to patients has been associated with health outcomes in many medical contexts but has not been explored in collegiate sports medicine. The relationship between administrative and financial oversight models and staffing is also unknown. OBJECTIVE:To (1) evaluate staffing patterns in Nati...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-0463-19
更新日期:2020-06-23 00:00:00
abstract::OBJECTIVE: To measure and compare latency, electromechanical delay, and speed of motor response of the peroneus longus muscle in a large sample of subjects with healthy or unstable ankles. DESIGN AND SETTING: Subjects with healthy or unstable ankles underwent identical test procedures consisting of 6 consecutive, sudd...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:2002-12-01 00:00:00
abstract:CONTEXT:Athletes running in a hot, humid environment may have an increased risk of heat illness. In the 2004 Olympic Games, American and Australian athletes were provided with ice vests designed to cool their bodies before performance. The vest appeared to be effective in keeping body temperatures down and improving th...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:2006-10-01 00:00:00
abstract:OBJECTIVE:To provide treatment guidelines for rehabilitation after ligamentous and labral surgery of the shoulder. DATA SOURCES:We searched Index Medicus for the last 10 years using the key words "shoulder instability," "shoulder exercises," and "shoulder surgery." DATA SYNTHESIS:Detailed rehabilitation programs for ...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:2000-07-01 00:00:00
abstract:CONTEXT:Athletic trainers (ATs) recognize patient care documentation as an important part of clinical practice. However, ATs using 1 electronic medical record (EMR) platform reported low accountability and lack of time as barriers to documentation. Whether ATs using paper, other EMRs, or a combined paper-electronic sys...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-0406.19
更新日期:2020-10-01 00:00:00
abstract:CONTEXT:There is plenty of information on electrocardiogram (ECG) and blood pressure (BP) changes in senior athletes. However, a corresponding data in adolescent athletes are scarce. OBJECTIVE:To study the differences in resting ECG and BP between adolescent endurance athletes, non-endurance athletes, and non-athletes...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/78-20
更新日期:2020-11-05 00:00:00
abstract:CONTEXT:Runners with high medial longitudinal arch structure demonstrate unique kinematics and kinetics that may lead to running injuries. The mobility of the midfoot as measured by the change in arch height is also suspected to play a role in lower extremity function during running. The effect of arch mobility in high...
journal_title:Journal of athletic training
pub_type: 临床试验,杂志文章
doi:10.4085/1062-6050-49.3.05
更新日期:2014-05-01 00:00:00
abstract:CONTEXT:Whenever professionals have multiple role obligations in the workplace, they face potential professional role complexities. OBJECTIVE:To examine whether certified athletic trainers (ATs) employed at the collegiate level experienced professional role complexities, and if so, what effect those complexities had u...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-43.4.373
更新日期:2008-07-01 00:00:00
abstract::OBJECTIVE: To describe a treatment strategy for paradoxical vocal-cord dysfunction (PVCD) as it applies to an athletic population. BACKGROUND: Paradoxical vocal-cord dysfunction has been identified as a cause of dyspnea and stridor in athletes. The basic element of PVCD is an inappropriate closure of the vocal cords d...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:2002-09-01 00:00:00
abstract::OBJECTIVE: To determine whether isotonic or isokinetic contractions produced greater electromyographic (EMG) activity per unit of work during isotonic and isokinetic knee-extension exercise. DESIGN AND SETTING: Subjects performed three 3-second maximal voluntary isometric contractions of the dominant knee extensors fo...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:2001-12-01 00:00:00
abstract::OBJECTIVE: To examine the effects of repetitive impact forces on lacrosse helmets and increase awareness of helmet safety standards about reconditioning and recertification practices. DESIGN AND SETTING: The independent variables for this study consisted of 4 lacrosse helmets of various design: 2 contemporary helmets ...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:2002-06-01 00:00:00
abstract::States regulate professions to protect the public from harm by unqualified practitioners. Without regulation of athletic trainers (ATs), there is no legal way to assure quality health care to athletes because there is no legal definition as to what an AT can and cannot do. Problems exist, however; 1) ATs nationwide ma...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:1996-04-01 00:00:00
abstract:CONTEXT:Successful implementation of evidence-based practice (EBP) within athletic training is contingent upon understanding the attitudes and beliefs and perceived barriers toward EBP as well as the accessibility to EBP resources of athletic training educators, clinicians, and students. OBJECTIVE:To assess the attitu...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-48.2.19
更新日期:2013-05-01 00:00:00
abstract:CONTEXT: The Landing Error Scoring System (LESS) can be used to identify individuals with an elevated risk of lower extremity injury. The limitation of the LESS is that raters identify movement errors from video replay, which is time-consuming and, therefore, may limit its use by clinicians. A markerless motion-captur...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-52.10.12
更新日期:2017-11-01 00:00:00
abstract:OBJECTIVE:To review current management techniques and describe an alternative technique for managing epistaxis in athletes. BACKGROUND:Nosebleeds are not usually considered a serious medical condition, but management can be a challenge. Traditional management techniques may place opposing athletes at risk for blood ex...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:1997-07-01 00:00:00
abstract:OBJECTIVE: To present recommendations for the diagnosis, management, outcomes, and return to play of athletes with superior labral anterior-posterior (SLAP) injuries. BACKGROUND: In overhead athletes, SLAP tears are common as either acute or chronic injuries. The clinical guidelines presented here were developed bas...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-59-16
更新日期:2018-03-01 00:00:00
abstract:OBJECTIVE:To determine injury types, natures, anatomical locations, recommended amount of time missed, and injury rates during weightlifting training. DESIGN AND SETTING:We collected and analyzed medical injury records of resident athletes and during numerous training camps to generate an injury profile. SUBJECTS:Eli...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:1999-07-01 00:00:00
abstract::OBJECTIVE: To document neurocognitive and neurobehavioral consequences of 1 versus 2 concussions. DESIGN AND SETTING: Nonequivalent, pretest-posttest cohort design with multiple dependent measures. Participants were selected from a large sample of athletes who participated in a comprehensive, multiuniversity study of ...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:2001-09-01 00:00:00
abstract:CONTEXT: :A multilevel model has been used to describe the complex nature of work-life balance in sport organizations. Organizational aspects such as work scheduling, hours worked, job demands, and decreased perceived value have been reported as factors that can positively or negatively affect work-life balance. Howeve...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-311-17
更新日期:2018-08-01 00:00:00
abstract:CONTEXT:With regard to intermittent training exercise, the effects of the mode of recovery on subsequent performance are equivocal. OBJECTIVE:To compare the effects of 3 types of recovery intervention on peak torque (PT) and electromyographic (EMG) activity of the knee extensor muscles after fatiguing isokinetic inter...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-46.4.386
更新日期:2011-07-01 00:00:00
abstract:OBJECTIVE:To introduce the process of journal writing to promote reflection and discuss the techniques and strategies to implement journal writing in an athletic training education curriculum. BACKGROUND:Journal writing can facilitate reflection and allow students to express feelings regarding their educational experi...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:2006-04-01 00:00:00
abstract::Scores from motor performance tests were compared using subjects with taped and untaped ankles. Previous studies have shown that taped ankle support may be detrimental in vertical and standing broad jumping performance. Conflicting data have been published on the effects of commercial ankle braces on various motor tas...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:1992-01-01 00:00:00