Abstract:
CONTEXT:Functional ankle instability (FAI) is a debilitating condition that has been reported to occur after 20% to 50% of all ankle sprains. Landing from a jump is one common mechanism of ankle injury, yet few researchers have explored the role of visual cues and anticipatory muscle contractions, which may influence ankle stability, in lateral jumping maneuvers. OBJECTIVE:To examine muscle-activation strategies between FAI and stable ankles under a lateral load and to evaluate the differences in muscle activation in participants with FAI and participants with stable ankles when they were unable to anticipate the onset of lateral loads during eyes-open versus eyes-closed conditions. DESIGN:Case-control study. SETTING:Controlled laboratory setting. PATIENTS OR OTHER PARTICIPANTS:A total of 40 people participated: 20 with FAI and 20 healthy, uninjured, sex- and age-matched persons (control group). INTERVENTION(S):Participants performed a 2-legged lateral jump off a platform onto a force plate set to heights of 35 cm or 50 cm and then immediately jumped for maximal height. They performed jumps in 2 conditions (eyes open, eyes closed) and were unaware of the jump height when their eyes were closed. MAIN OUTCOME MEASURE(S):Amplitude normalized electromyographic (EMG) area (%), peak (%), and time to peak in the tibialis anterior (TA), peroneus longus (PL), and lateral gastrocnemius (LG) muscles were measured. RESULTS:Regardless of the eyes-open or eyes-closed condition, participants with FAI had less preparatory TA (t158 = 2.22, P = .03) and PL (t158 = 2.09, P = .04) EMG area and TA (t158 = 2.45, P = .02) and PL (t158 = 2.17, P = .03) peak EMG than control-group participants. CONCLUSIONS:By removing visual cues, unanticipated lateral joint loads occurred simultaneously with decreased muscle activity, which may reduce dynamic restraint capabilities in persons with FAI. Regardless of visual impairment and jump height, participants with FAI exhibited PL and TA inhibition, which may limit talonavicular stability and intensify lateral joint surface compression and pain.
journal_name
J Athl Trainjournal_title
Journal of athletic trainingauthors
Rosen A,Swanik C,Thomas S,Glutting J,Knight C,Kaminski TWdoi
10.4085/1062-6050-48.5.05subject
Has Abstractpub_date
2013-11-01 00:00:00pages
773-81issue
6eissn
1062-6050issn
1938-162Xjournal_volume
48pub_type
杂志文章abstract:OBJECTIVE:The purpose of this study was to assess the effect of low-volt, microamperage stimulation (LVMAS) on perceived pain and muscle strength following an intense bout of eccentric exercise. DESIGN AND SETTING:An experimental pretest-posttest control group design was used for the study. The experiment was conducte...
journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
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journal_title:Journal of athletic training
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doi:
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journal_title:Journal of athletic training
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journal_title:Journal of athletic training
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journal_title:Journal of athletic training
pub_type: 杂志文章
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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:Quadriceps and hamstrings weakness occurs frequently after anterior cruciate ligament (ACL) injury and reconstruction. Evidence suggests that knee injury may precipitate hip and ankle muscle weakness, but few data support this contention after ACL injury and reconstruction. OBJECTIVE:To determine if hip, knee,...
journal_title:Journal of athletic training
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journal_title:Journal of athletic training
pub_type: 杂志文章,meta分析
doi:10.4085/1062-6050-47.6.10
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journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
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journal_title:Journal of athletic training
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doi:
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journal_title:Journal of athletic training
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journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:2001-06-01 00:00:00
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journal_title:Journal of athletic training
pub_type: 杂志文章
doi:10.4085/1062-6050-49.3.40
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journal_title:Journal of athletic training
pub_type: 杂志文章
doi:
更新日期:2001-09-01 00:00:00
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更新日期:2015-07-01 00:00:00
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doi:10.4085/1062-6050-50.12.02
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doi:10.4085/1062-6050-173-17
更新日期:2018-10-01 00:00:00
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journal_title:Journal of athletic training
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更新日期:2011-09-01 00:00:00
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doi:
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journal_title:Journal of athletic training
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journal_title:Journal of athletic training
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