Differences in lateral drop jumps from an unknown height among individuals with functional ankle instability

Adam B Rosen, Charles Swanik, Stephen Thomas, Joseph Glutting, Christopher Knight, Thomas W. Kaminski

Research output: Contribution to journalArticle

6 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)773-781
Number of pages9
JournalJournal of Athletic Training
Volume48
Issue number6
DOIs
StatePublished - Nov 1 2013

Fingerprint

Ankle
Ankle Injuries
Muscles
Cues
Joints
Control Groups
Vision Disorders
Muscle Contraction
Case-Control Studies
Skeletal Muscle
Research Personnel
Outcome Assessment (Health Care)
Pain

Keywords

  • Electromyography
  • Neuromuscular control
  • Peroneus longus
  • Tibialis anterior

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Differences in lateral drop jumps from an unknown height among individuals with functional ankle instability. / Rosen, Adam B; Swanik, Charles; Thomas, Stephen; Glutting, Joseph; Knight, Christopher; Kaminski, Thomas W.

In: Journal of Athletic Training, Vol. 48, No. 6, 01.11.2013, p. 773-781.

Research output: Contribution to journalArticle

Rosen, Adam B ; Swanik, Charles ; Thomas, Stephen ; Glutting, Joseph ; Knight, Christopher ; Kaminski, Thomas W. / Differences in lateral drop jumps from an unknown height among individuals with functional ankle instability. In: Journal of Athletic Training. 2013 ; Vol. 48, No. 6. pp. 773-781.
@article{9980ba42d94c42a9b246f9b6a51800c4,
title = "Differences in lateral drop jumps from an unknown height among individuals with functional ankle instability",
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.",
keywords = "Electromyography, Neuromuscular control, Peroneus longus, Tibialis anterior",
author = "Rosen, {Adam B} and Charles Swanik and Stephen Thomas and Joseph Glutting and Christopher Knight and Kaminski, {Thomas W.}",
year = "2013",
month = "11",
day = "1",
doi = "10.4085/1062-6050-48.5.05",
language = "English (US)",
volume = "48",
pages = "773--781",
journal = "Journal of Athletic Training",
issn = "1062-6050",
publisher = "National Athletic Trainers' Association Inc.",
number = "6",

}

TY - JOUR

T1 - Differences in lateral drop jumps from an unknown height among individuals with functional ankle instability

AU - Rosen, Adam B

AU - Swanik, Charles

AU - Thomas, Stephen

AU - Glutting, Joseph

AU - Knight, Christopher

AU - Kaminski, Thomas W.

PY - 2013/11/1

Y1 - 2013/11/1

N2 - 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.

AB - 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.

KW - Electromyography

KW - Neuromuscular control

KW - Peroneus longus

KW - Tibialis anterior

UR - http://www.scopus.com/inward/record.url?scp=84890364468&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84890364468&partnerID=8YFLogxK

U2 - 10.4085/1062-6050-48.5.05

DO - 10.4085/1062-6050-48.5.05

M3 - Article

VL - 48

SP - 773

EP - 781

JO - Journal of Athletic Training

JF - Journal of Athletic Training

SN - 1062-6050

IS - 6

ER -