Effect of Plantar Flexor and Dorsiflexor Fatigue on Unilateral Postural Control

1993 ◽  
Vol 9 (3) ◽  
pp. 191-201 ◽  
Author(s):  
Thomas M. Lundin ◽  
Jon W. Feuerbach ◽  
Mark D. Grabiner
Keyword(s):  
Ankle Joint ◽  
Postural Sway ◽  
Plantar Flexor ◽  
Plantar Flexors ◽  
Joint Injury ◽  
Balance System ◽  
Fatigue Protocol ◽  
Before And After ◽  
Ankle Muscle ◽  
Male Subjects

The purpose of this study was to determine the effect of plantar flexor and dorsiflexor fatigue on postural sway amplitude during unilateral, or one-legged, stance. It was hypothesized that plantar flexor and dorsiflexor fatigue would increase unilateral postural sway amplitude. Eight uninjured male subjects participated in pre- and postfatigue unilateral stability tests. Selected parameters describing medial-lateral (ML) and anterior-posterior (AP) postural sway were measured on a Chattecx Balance System before and after an isokinetic fatigue protocol. The fatigue protocol resulted in a significant increase in ML postural sway amplitude (p< 0.05) and an increase in AP sway amplitude (p= 0.065). Previously, links have been established between increased postural sway amplitude and ankle joint injury. Thus, fatigue of the plantar flexors and dorsiflexors, which increased postural sway amplitude, may render the ankle joint susceptible to injury. Induced ankle muscle fatigue may represent a valid paradigm to study the causes of traumatic ankle joint injury.

scholarly journals Role of Spasticity Severity on the Balance of Post-stroke Patients

2021 ◽  
Vol 15 ◽  
Author(s):  
Ashraf Mahmoudzadeh ◽  
Noureddin Nakhostin Ansari ◽  
Soofia Naghdi ◽  
Ehsan Ghasemi ◽  
Omid Motamedzadeh ◽  
...  
Keyword(s):  
Ankle Joint ◽  
Postural Sway ◽  
Ankle Dorsiflexion ◽  
Plantar Flexor ◽  
Plantar Flexors ◽  
Timed Up And Go ◽  
Balance Confidence ◽  
Eyes Closed ◽  
Eyes Open ◽  
Ankle Proprioception

Background: Lower limb spasticity after stroke is common that can affect the balance, increase the risk of falling, and reduces the quality of life.Objective: First, evaluate the effects of spasticity severity of ankle plantar flexors on balance of patients after stroke. Second, to determine the relationship between the spasticity severity with ankle proprioception, passive ankle dorsiflexion range of motion (ROM), and balance confidence.Methods: Twenty-eight patients with stroke based on the Modified Modified Ashworth Scale (MMAS) were divided into two groups: High Spasticity Group (HSG) (MMAS &gt; 2) (n = 14) or a Low Spasticity Group (LSG) (MMAS ≤ 2) (n = 14). The MMAS scores, Activities-Specific Balance Confidence Questionnaire, postural sway of both affected and non-affected limbs under the eyes open and eyes closed conditions, timed up and go (TUG) test, passive ankle dorsiflexion ROM, and ankle joint proprioception were measured.Results: The ankle joint proprioception was significantly better in the LSG compared to the HSG (p = 0.01). No significant differences were found between the LSG and HSG on all other outcome measures. There were no significant relationships between the spasticity severity and passive ankle dorsiflexion ROM, and balance confidence.Conclusion: The severity of ankle plantar flexor spasticity had no effects on balance of patients with stroke. However, the ankle joint proprioception was better in patients with low spasticity. Our findings suggest that the balance is affected regardless of the severity of the ankle plantar flexor spasticity in this group of participants with stroke.

The Immediate Effects of Ankle Joint Mobilization on Ankle Musculotendinous Stiffness in Individuals With Chronic Ankle Instability

2020 ◽  
pp. 1-5
Author(s):  
M. Spencer Cain ◽  
Kyeongtak Song ◽  
J. Troy Blackburn ◽  
Kimmery Migel ◽  
Erik A. Wikstrom
Keyword(s):  
Ankle Joint ◽  
Ankle Instability ◽  
Change Score ◽  
Chronic Ankle Instability ◽  
Minimal Detectable Change ◽  
Plantar Flexor ◽  
Joint Mobilization ◽  
Before And After ◽  
Damped Oscillation ◽  
Musculotendinous Stiffness

Ankle joint mobilization has been shown to be effective at improving outcomes in those with chronic ankle instability (CAI), but the neuromuscular mechanisms are still unknown. We aimed to determine the immediate effect of a single Grade III anterior-to-posterior ankle joint mobilization bout on ankle musculotendinous stiffness (MTS) in those with CAI. Seventeen CAI participants had plantar flexor and fibularis MTS assessed before and after a 5-min joint mobilization treatment. MTS outcomes were estimated using the damped oscillation method. Fibularis (0.25 ± 0.41 N/m/kg, p = .028) but not plantar flexor MTS (−2.18 ± 14.35 N/m/kg, p = .539) changed following mobilization and exceeded the calculated minimal detectable change score (0.12 N/m/kg). Increased fibularis MTS may represent a neuromuscular mechanism by which ankle joint mobilizations improve postural control in those with CAI.

Mechanical and electromyographic analysis of reciprocal inhibition at the human ankle joint

1995 ◽  
Vol 74 (2) ◽  
pp. 849-855 ◽  
Author(s):  
T. Sinkjaer ◽  
J. Nielsen ◽  
E. Toft
Keyword(s):  
Ankle Joint ◽  
Stretch Reflex ◽  
Plantar Flexion ◽  
Joint Stiffness ◽  
Common Peroneal Nerve ◽  
Reciprocal Inhibition ◽  
Mechanical Effect ◽  
Voluntary Contraction ◽  
Plantar Flexors ◽  
Before And After

1. The purpose of the present study is to investigate how reciprocal inhibition influences the mechanical and electromyographic (EMG) properties of the ankle plantar flexors in humans during a voluntary contraction. 2. At different levels of maintained plantar flexion contractions ranging from 0 to 20 Nm, the size of the soleus EMG stretch reflex and the ankle joint stiffness (ration between the torque increment and the amplitude of the stretch) were measured in response to an imposed dorsiflexion. At matched plantar flexion contraction levels, stretch responses were compared before and after reversible block of the common peroneal nerve (CPN). Stretch responses were also measured during an attempted voluntary fictive dorsiflexion after CPN block. 3. In the preactivated soleus muscles, the phasic EMG response to stretch consisted of two peaks labeled M1 and M2. After CPN block, the M1 short-latency stretch reflex on average increased by 25 +/- 5.7%, mean +/- SD (P < 0.001), and the M2 stretch reflex increased on average by 29 +/- 13.0% (P = 0.002). 4. The total stiffness of the ankle joint during a stretch is the sum of the nonreflex and the reflex mediated stiffness. The total stiffness after CPN block increased on average by 13 +/- 2.7% (P = 0.002) and the estimated reflex stiffness by 33 +/- 6.5% (P < 0.001). 5. When the subjects were asked to make a strong dorsiflexion after CPN block, the soleus stretch reflex was depressed to the extent that the reflex mediated mechanical effect around the ankle joint was abolished.(ABSTRACT TRUNCATED AT 250 WORDS)

scholarly journals Effect of Integrated Training on Balance and Ankle Reposition Sense in Ballet Dancers

2021 ◽  
Vol 18 (23) ◽  
pp. 12751
Author(s):  
Chai-Wei Lin ◽  
Yu-Lin You ◽  
Yi-An Chen ◽  
Tzu-Chan Wu ◽  
Cheng-Feng Lin
Keyword(s):  
Training Program ◽  
Ankle Joint ◽  
Center Of Pressure ◽  
Equilibrium Phase ◽  
Core Stability ◽  
Lateral Direction ◽  
Ballet Dancers ◽  
Muscle Strengthening ◽  
Before And After ◽  
Ankle Muscle

Objective: To investigate the effects of a 6-week integrated training program on the ankle joint reposition sense and postural stability in ballet dancers. Methods: Sixteen female ballet dancers participated in the study and underwent a 6-week integrated training program consisting of plyometric, proprioception and core stability exercises along with a home program involving additional ankle muscle strengthening and stretching. The ankle joint reposition tests and the parameters of the center of pressure (COP) while performing grand-plie (deep squatting) and releve en demi-pointe (standing on balls of foot) movements were measured before and after training. Results: After 6 weeks, participants showed significantly smaller absolute ankle joint reposition errors in dorsiflexion (p = 0.031), plantarflexion (p = 0.003) and eversion (p = 0.019) compared to the pre-training measurement. Furthermore, after training, a significantly slower average COP speed at pre-equilibrium during grand-plie movement (p = 0.003) and pre-equilibrium phase of releve en demi-pointe (p = 0.023) were observed. In addition, the maximum COP displacement in the medial-lateral direction was significantly smaller at pre-equilibrium phase during grand-plie (p = 0.044) and releve en demi-pointe movements (p = 0.004) after training. Conclusions: The 6-week integrated training program improved the ankle joint reposition sense and postural control in the medial-lateral direction during grand-plie and releve en demi-pointe movements.

scholarly journals Effect of Achilles Tendon Lengthening on Ankle Muscle Performance in People With Diabetes Mellitus and a Neuropathic Plantar Ulcer

2005 ◽  
Vol 85 (1) ◽  
pp. 34-43 ◽  
Author(s):  
Gretchen B Salsich ◽  
Michael J Mueller ◽  
Mary Kent Hastings ◽  
David R Sinacore ◽  
Michael J Strube ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Baseline Level ◽  
Peak Torque ◽  
Muscle Performance ◽  
Plantar Flexor ◽  
Passive Torque ◽  
Tendon Lengthening ◽  
Plantar Ulcer ◽  
Ankle Muscle ◽  
Male Subjects

Abstract Background and Purpose. The effect of a tendo-Achilles lengthening (TAL) procedure on ankle muscle performance has not been clearly established. The purpose of this study was to compare the effects of TAL and total-contact casting (TCC) with TCC alone on ankle muscle performance in subjects with diabetes mellitus (DM) and a neuropathic plantar ulcer. Subjects. Subjects were randomly assigned to either a TAL group (3 female and 12 male subjects) or a TCC group (4 female and 10 male subjects). Methods. Muscle performance measurements were obtained using an isokinetic dynamometer. Results. Concentric plantar-flexor peak torque decreased 31% after TAL but returned to the baseline level after 8 months. Dorsiflexor peak torque did not change in either group. Plantar-flexor passive torque at 0 degrees of dorsiflexion decreased after TAL but increased to 60% of the baseline level after 8 months. Maximal dorsiflexion angle increased 11 degrees after TAL and remained increased at 8 months. Discussion and Conclusion. The TAL resulted in an increase in ankle dorsiflexion range of motion and a temporary reduction in concentric plantar-flexor peak torque and passive torque at 0 degrees of dorsiflexion. If TAL is being considered for people with DM and a neuropathic forefoot ulcer, the initial compromise in plantar-flexor muscle performance should be addressed.

Effect of a 4-Week Agility-Training Program on Postural Sway in the Functionally Unstable Ankle

2001 ◽  
Vol 10 (1) ◽  
pp. 24-35 ◽  
Author(s):  
Damien M. Hess ◽  
Christopher J. Joyce ◽  
Brent L. Arnold ◽  
Bruce M. Gansneder
Keyword(s):  
Experimental Design ◽  
Training Program ◽  
Outcome Measures ◽  
Repeated Measures ◽  
Postural Sway ◽  
Balance System ◽  
Type Design ◽  
Before And After ◽  
Experimental Group ◽  
Anterior Posterior

Context:Agility training has been proposed as an important tool in rehabilitation. However, it is unclear which types of agility training are most useful.Objective:To assess the effects of agility training on balance in individuals with functionally unstable ankles.Design:A 2-group experimental design with repeated measures.Setting:Laboratory.Patients:Twenty college-aged volunteers, each with 1 functionally unstable ankle, were randomly assigned to 1 of 2 groups.Interventions:Subjects in the experimental group performed agility training 3 times per week for 4 weeks.Main Outcome Measures:Subjects were tested for static single-leg balance before and after the training period. Anterior/posterior sway amplitude, medial/lateral sway amplitude, and sway index were assessed using the Chattex Balance System.Results:No significant differences in balance were found after the agility training.Conclusions:Agility training did not improve static single-leg balance in subjects with functionally unstable ankles.

Role of spasticity severity on the balance of post-stroke patients (Preprint)

2021 ◽  
Author(s):  
Ashraf Mahmoudzadeh ◽  
Noureddin Nakhostin Ansari ◽  
Soofia Naghdi ◽  
Ehsan Ghasemi ◽  
Brandon S Shaw ◽  
...  
Keyword(s):  
Range Of Motion ◽  
Ankle Joint ◽  
Postural Sway ◽  
Dynamic Balance ◽  
Ankle Dorsiflexion ◽  
Plantar Flexor ◽  
Stroke Patients ◽  
Timed Up And Go ◽  
Balance Confidence ◽  
Post Stroke

BACKGROUND Lower limb spasticity, as is common following a cerebrovascular attack (CVA) or stroke, can affect the balance and gait of patients. This then not only affects independence, and quality of life, but also increases the risk for other concerns, such as falling and an increased sedentariness, which could further affect health outcomes. OBJECTIVE We aimed to evaluate the effect of ankle plantar flexor spasticity severity on balance and to determine the relationship between the spasticity severity with ankle proprioception, passive range of motion (ROM), and balance confidence in post-stroke patients. METHODS Twenty-eight post-stroke patients were divided into two groups based on the level of ankle plantar flexor spasticity according to the Modified Modified Ashworth Scale (MMAS) as a High Spasticity Group (HSG) (MMAS>2) (n=14) or a Low Spasticity Group (LSG) (MMAS≤2) (n=14). The MMAS scores, Activities-Specific Balance Confidence Questionnaire, postural sway in the open and closed eyes conditions, timed up and go (TUG) test, ankle dorsiflexion passive range of motion (ROM), and ankle joint proprioception were measured. RESULTS No significant (p>0.05) differences were found between the LSG and HSG in terms of balance confidence, dynamic balance, and ankle dorsiflexion ROM. In addition, postural sway in the open and closed eye conditions was not significantly different in both the LSG and HSG for both the less affected and affected limbs. Similarly, posturography indicators in the open and closed eye conditions were not significantly different in both the LSG and HSG for both the less affected and affected limbs. However, ankle joint proprioception in terms of repositioning error angle was significantly (p≤0.05) better in the LSG compared to the HSG (p=0.01). There was also a significant relationship between TUG scores and balance confidence in the HSG(r=-0.55, p=0.04) CONCLUSIONS Our data suggests that several aspects of balance needs to be considered in the assessment and rehabilitation of post-stroke patients and there is a need to monitor entire patterns of activities to support wider engagement in rehabilitation activities. INTERNATIONAL REGISTERED REPORT RR2-10.2196/16045

scholarly journals Post-Drive Standing Balance of Vehicle Passengers Using Wearable Sensors: The Effect of On-Road Driving and Task Performance

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 4997
Author(s):  
Victor C. Le ◽  
Monica L. H. Jones ◽  
Kathleen H. Sienko
Keyword(s):  
Task Performance ◽  
Postural Sway ◽  
Wearable Sensors ◽  
Standing Balance ◽  
Balance Performance ◽  
Real Time Traffic ◽  
Balance Exercises ◽  
Before And After ◽  
The Relationship ◽  
And Task

Postural sway has been demonstrated to increase following exposure to different types of motion. However, limited prior studies have investigated the relationship between exposure to normative on-road driving conditions and standing balance following the exposure. The purpose of this on-road study was to quantify the effect of vehicle motion and task performance on passengers’ post-drive standing balance performance. In this study, trunk-based kinematic data were captured while participants performed a series of balance exercises before and after an on-road driving session in real-time traffic. Postural sway for all balance exercises increased following the driving session. Performing a series of ecologically relevant visual-based tasks led to increases in most post-drive balance metrics such as sway position and velocity. However, the post-drive changes following the driving session with a task were not significantly different compared to changes observed following the driving session without a task. The post-drive standing balance performance changes observed in this study may increase vulnerable users’ risk of falling. Wearable sensors offer an opportunity to monitor postural sway following in-vehicle exposures.

scholarly journals Effects of the Suboccipital Muscle Inhibition Technique on the Range of Motion of the Ankle Joint and Balance According to Its Application Duration: A Randomized Controlled Trial

Healthcare ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 646
Author(s):  
Han-Sol Kang ◽  
Hyung-Wook Kwon ◽  
Di-gud Kim ◽  
Kwang-Rak Park ◽  
Suk-Chan Hahm ◽  
...  
Keyword(s):  
Randomized Controlled Trial ◽  
Range Of Motion ◽  
Ankle Joint ◽  
Controlled Trial ◽  
Balance Test ◽  
Randomized Controlled ◽  
Active Range Of Motion ◽  
Before And After ◽  
Muscle Inhibition ◽  
Inhibition Technique

This study aimed to investigate the effects of suboccipital muscle inhibition technique (SMIT) on active range of motion (AROM) of the ankle joint, lunge angle (LA), and balance in healthy adults, according to the duration of its application. A total of 80 participants were randomly allocated to the 4-min suboccipital muscle inhibition (SMI) group (SMI_4M, n = 20), 8-min SMI group (n = 20), 4-min sham-SMI (SSMI) group (n = 20), and 8-min SSMI group (n = 20). Accordingly, the SMIT and sham SMIT were applied for 4 min or 8 min in the respective groups. AROM of dorsiflexion and LA were assessed, and a single leg balance test (SLBT) was performed before and after the intervention. AROM (4 min, p < 0.001; 8 min, p < 0.001), LA (4 min, p < 0.001; 8 min, p < 0.001), and SLBT (4 min, p < 0.001; 8 min, p < 0.001) significantly improved after SMI application. Compared with the SSMI group, the SMI group showed a significant increase in AROM (p < 0.001), LA (p < 0.001), and SLBT (p < 0.001). Except for SLBT (p = 0.016), there were no significant interactions between intervention and application duration. The results suggest that the SMIT, at durations of both 4 and 8 min, could be effective tools for improving AROM, LA, and balance.

Relationship between postural sway on an unstable platform and ankle plantar flexor force steadiness in community-dwelling older women

2021 ◽  
Vol 84 ◽  
pp. 227-231
Author(s):  
Tetsuya Hirono ◽  
Tome Ikezoe ◽  
Momoko Yamagata ◽  
Takehiro Kato ◽  
Misaka Kimura ◽  
...  
Keyword(s):  
Older Women ◽  
Postural Sway ◽  
Community Dwelling ◽  
Plantar Flexor ◽  
Force Steadiness ◽  
Unstable Platform
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