Abstract:
CONTEXT:Greater musculotendinous stiffness may enhance spinal stretch reflex sensitivity by improving mechanical coupling of the muscle spindle and the stretch stimulus. This heightened sensitivity would correspond with a shorter latency and higher-amplitude reflex response, potentially enhancing joint stability. OBJECTIVE:To compare spinal stretch reflex latency and amplitude across groups that differed in musculotendinous stiffness. DESIGN:Static group comparisons. SETTING:Research laboratory. PATIENTS OR OTHER PARTICIPANTS:Forty physically active individuals (20 men, 20 women). INTERVENTION(S):We verified a sex difference in musculotendinous stiffness and compared spinal stretch reflex latency and amplitude in high-stiffness (men) and low-stiffness (women) groups. We also evaluated relationships between musculotendinous stiffness and spinal stretch reflex latency and amplitude, respectively. MAIN OUTCOME MEASURE(S):Triceps surae musculotendinous stiffness and soleus spinal stretch reflex latency and amplitude were assessed at 30% of a maximal voluntary isometric plantar-flexion contraction. RESULTS:The high-stiffness group demonstrated significantly greater stiffness (137.41 +/- 26.99 N/cm) than the low-stiffness group did (91.06 +/- 20.10 N/cm). However, reflex latency (high stiffness = 50.11 +/- 2.07 milliseconds, low stiffness = 48.26 +/- 2.40 milliseconds) and amplitude (high stiffness = 0.28% +/- 0.12% maximum motor response, low stiffness = 0.31% +/- 0.16% maximum motor response) did not differ significantly across stiffness groups. Neither reflex latency (r = .053, P = .746) nor amplitude (r = .073, P = .653) was related significantly to musculotendinous stiffness. CONCLUSIONS:A moderate level of pretension (eg, 30%) likely eliminates series elastic slack; thus, a greater change in force per unit-of-length change (ie, heightened stiffness) would have minimal effects on coupling of the muscle spindle and the stretch stimulus and, therefore, on spinal stretch reflex sensitivity. It appears unlikely that differences in musculotendinous stiffness influenced spinal stretch reflex sensitivity when initiated from a moderate level of pretension. Consequently, differences in musculotendinous stiffness did not appear to influence dynamic joint stability with respect to reflexive neuromuscular control.
journal_name
J Athl Trainjournal_title
Journal of athletic trainingauthors
Blackburn JT,Padua DA,Guskiewicz KMdoi
10.4085/1062-6050-43.1.29subject
Has Abstractpub_date
2008-01-01 00:00:00pages
29-36issue
1eissn
1062-6050issn
1938-162Xjournal_volume
43pub_type
杂志文章abstract:CONTEXT:Playing tennis requires unilateral and intensive movement of the upper limb, which may lead to functional adaptations of the shoulder and an increased injury risk. Identifying which athletes will be future elite tennis players starts at 5 to 6 years of age. Therefore, highly skilled players practice intensively...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050.52.1.10
更新日期:2017-02-01 00:00:00
abstract:CONTEXT:Researchers have examined the physical activity (PA) habits of certified athletic trainers; however, none have looked specifically at athletic training students. OBJECTIVE:To assess PA participation and constraints to participation among athletic training students. DESIGN:Cross-sectional study. SETTING:Entry...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-49.3.56
更新日期:2015-02-01 00:00:00
abstract::OBJECTIVE: To evaluate the factorial and construct validity of the Head Injury Scale (HIS) among a sample of male and female collegiate athletes. DESIGN AND SETTING: Using a cross-sectional design, we established the factorial validity of the HIS scale with confirmatory factor analysis and the construct validity of th...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:2003-06-01 00:00:00
abstract:OBJECTIVE:To present the case of a 22-year-old football player who sustained an acute posterior-wall acetabular fracture. BACKGROUND:Acetabular fractures can be a difficult injury for the athletic trainer to assess. Aside from the obvious immediate ramifications, proper assessment and care are necessary to decrease th...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:2000-01-01 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:CONTEXT:Limited data are available regarding the prevalence and nature of invalid computerized baseline neurocognitive test data. OBJECTIVE:To identify the prevalence of invalid baselines on the desktop and online versions of ImPACT and to document the utility of correcting for left-right (L-R) confusion on the deskt...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-47.3.14
更新日期:2012-05-01 00:00:00
abstract:CONTEXT:Athletes are often exposed to pain due to injury and competition. There is preliminary evidence that cardiovascular measures could be an objective measure of pain, but the cardiovascular response can be influenced by psychological factors such as catastrophizing. OBJECTIVES:The purpose of our study was to use ...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/16-20
更新日期:2020-11-05 00:00:00
abstract:CONTEXT:Weakness or decreased activation of the hip abductors and external rotators has been associated with lower extremity injury, especially in females. Resisted side stepping is commonly used to address hip weakness. Whereas multiple variations of this exercise are used clinically, few data exist regarding which va...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-46-16
更新日期:2018-11-01 00:00:00
abstract::Lateral ankle sprains are the most common injuries sustained during physical activity. The epidemiologic trends associated with chronic ankle instability (CAI) suggest that current rehabilitation approaches may be inadequate. We sought to synthesize best-practices evidence for the rehabilitation of patients with acute...
journal_title:Journal of athletic training
pub_type: 杂志文章,评审
doi:10.4085/1062-6050-474-17
更新日期:2019-06-01 00:00:00
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journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-48.1.10
更新日期:2013-01-01 00:00:00
abstract:OBJECTIVE:To compare the cooling and rewarming effects of two clinical 20-minute cryotherapy treatments on the temperature of the human leg. DESIGN AND SETTING:Sixteen subjects were randomly treated with either 20 minutes of a 1.8-kg crushed-ice pack, placed directly over the left calf, or a 20-minute immersion in a c...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:1998-01-01 00:00:00
abstract:CONTEXT:Fatigue could contribute to ankle-sprain injuries during sport, particularly for individuals with chronic ankle instability (CAI). OBJECTIVE:To examine whether adults with or without CAI develop fatigue at similar rates when performing ankle exercises at the same relative effort level and whether these groups ...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-51.9.02
更新日期:2016-06-02 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:CONTEXT:The relationship between lower extremity alignment and lower extremity injury risk remains poorly understood, perhaps because most authors have examined only individual or a select group of alignment variables. Examining the relationships among alignment variables may allow us to more accurately describe lower ...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-44.5.511
更新日期:2009-09-01 00:00:00
abstract:CONTEXT: Diminished hip-abductor strength has been suggested to increase the risk of noncontact lateral ankle sprains. OBJECTIVE: To determine prospectively whether baseline hip-abductor strength predicts future noncontact lateral ankle sprains in competitive male soccer players. DESIGN: Prospective cohort study. ...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-52.11.18
更新日期:2017-11-01 00:00:00
abstract::The distribution of resources to athletic training programs varies greatly, depending on the size and scope of the athletic program. No research has been found that assesses the differences in dollars allocated within various athletic training settings or assesses whether the different program levels allocate similar ...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:1992-01-01 00:00:00
abstract:CONTEXT:Workplace bullying (WPB) is a series of persistent negative interactions that affect a clinician's ability to perform his or her role. Although WPB has been studied in other health professions, to date, no information exists pertaining to WPB in athletic training. OBJECTIVE:To determine the prevalence of WPB i...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-49.3.16
更新日期:2014-09-01 00:00:00
abstract:OBJECTIVE:To provide a comprehensive overview of the published literature regarding the effect of spirituality on health and healing. DATA SOURCES:I searched MEDLINE from 1976 to 1999 using the terms "spirituality," "religion," "faith," "healing," and "health." DATA SYNTHESIS:Strong scientific evidence suggests that ...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:2000-04-01 00:00:00
abstract:CONTEXT:Ankle sprains are the most common orthopaedic pathologic condition, and more concerning is the high percentage of persons who develop chronic ankle instability (CAI). Researchers have reported that patients with CAI are restricted occupationally, have more functional limitations, and have a poorer health-relate...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-50.3.05
更新日期:2015-07-01 00:00:00
abstract:CONTEXT:Quadriceps-activation deficits have been reported after meniscectomy. Transcranial magnetic stimulation (TMS) in conjunction with maximal contractions affects quadriceps activation in patients after meniscectomy. OBJECTIVE:To determine the effect of single-pulsed TMS on quadriceps central activation ratio (CAR...
journal_title:Journal of athletic training
pub_type: 杂志文章,随机对照试验
doi:10.4085/1062-6050-45.6.570
更新日期:2010-11-01 00:00:00
abstract:CONTEXT:Skeletal muscle fatigue and exercise performance are novel areas of research and clinical application in the photobiomodulation field, and positive outcomes have been reported in several studies; however, the optimal measures have not been fully established. OBJECTIVE:To assess the acute effect of photobiomodu...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-51.3.10
更新日期:2016-02-01 00:00:00
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journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-0387.19
更新日期:2020-09-01 00:00:00
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journal_title:Journal of athletic training
pub_type: 杂志文章,多中心研究
doi:10.4085/1062-6050-48.1.03
更新日期:2013-01-01 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:CONTEXT:The prevalence of shoulder pain among competitive swimmers is high, but no guidelines exist to reduce shoulder injuries. Elucidating differences between swimmers with and without shoulder pain can serve as a basis for the development of a program to prevent shoulder injury that might lead to pain and dysfunctio...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-47.2.149
更新日期:2012-03-01 00:00:00
abstract:CONTEXT:The Patient-Reported Outcomes Measurement Information System (PROMIS) item banks have been validated for general populations, but their application to high-functioning patient populations remains speculative. OBJECTIVE:To examine the measurement properties of the PROMIS physical function item bank, version 1.0...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-51.11.06
更新日期:2016-09-01 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:OBJECTIVE:To present the case of a collegiate tennis player with celiac disease symptoms. BACKGROUND:Celiac disease is a common intestinal disorder that is often confused with other conditions. It causes severe intestinal damage manifested by several uncomfortable signs and symptoms. Failure by the sports medicine sta...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:2005-10-01 00:00:00
abstract:REFERENCE/CITATION:Calvert E, Chambers GK, Regan W, Hawkins RH, Leith JM. Special physical examination tests for superior labrum anterior-posterior shoulder injuries are clinically limited and invalid: a diagnostic systematic review. J Clin Epidemiol. 2009;62(5):558-563. CLINICAL QUESTION:The systematic review focused...
journal_title:Journal of athletic training
pub_type: 评论,杂志文章
doi:10.4085/1062-6050-48.3.14
更新日期:2013-11-01 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