Estimation of stiffening strategy of ankle and hip based on joint sway

Azaman, Aizreena; Yamamoto, Satoshi

doi:10.1109/ner.2013.6696243

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…They suggest that after increasing levels of threat, the CNS applies a 'stiffening strategy' [29,38,41] that leads to reducing the degree of freedom. In this strategy, reflexive muscle co-contractions occur around the ankle joint to maintain the body in the desired position in response to the threat [18,42,43]. In our study, participants were asked to use an ankle strategy rather than a hip strategy.…”

Section: The Effects Of the Threatening Conditions On Postural Stratementioning

confidence: 99%

A new postural stability-indicator to predict the level of fear of falling in Parkinson’s disease patients

et al. 2020

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Background: Fear of falling (FoF) is defined as a lasting concern about falling that causes a person to limit or even stop the daily activities that he/she is capable of. Seventy percent of Parkinson's disease (PD) patients report activity limitations due to FoF. Timely identification of FoF is critical to prevent its additional adverse effects on the quality of life. Self-report questionnaires are commonly used to evaluate the FoF, which may be prone to human error. Objectives: In this study, we attempted to identify a new postural stability-indicator to objectively predict the intensity of FoF and its related behavior(s) in PD patients. Methods: Thirty-eight PD patients participated in the study (mean age, 61.2 years), among whom 10 (26.32%) were identified with low FoF and the rest (73.68%) with high FoF, based on Falls Efficacy Scale-International (FES-I). We used a limit of stability task calibrated to each individual and investigated the postural strategies to predict the intensity of FoF. New parameters (FTR i s; functional time ratio) were extracted based on the center of pressure presence pattern in different rectangular areas (i = 1, 2, and 3). The task was performed on two heights to investigate FoF-related behavior(s). Results: FTR 1/2 (the ratio between FTR 1 and FTR 2) was strongly correlated with the FES-I (r = − 0.63, p < 0.001), Pull test (r = − 0.65, p < 0.001), Timed Up and Go test (r = − 0.57, p < 0.001), and Berg Balance Scale (r = 0.62, p < 0.001). The model of FTR 1/2 was identified as a best-fitting model to predicting the intensity of FoF in PD participants (sensitivity = 96.43%, specificity = 80%), using a threshold level of ≤ 2.83. Conclusions: Using the proposed assessment technique, we can accurately predict the intensity of FoF in PD patients. Also, the FTR 1/2 index can be potentially considered as a mechanical biomarker to sense the FoF-related postural instability in PD patients.

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Section: The Effects Of the Threatening Conditions On Postural Stratementioning

confidence: 99%

A new postural stability-indicator to predict the level of fear of falling in Parkinson’s disease patients

et al. 2020

View full text Add to dashboard Cite

show abstract

“…They suggest that after increasing levels of threat, the CNS applies a 'stiffening strategy' [29,37,40] that leads to reducing the degree of freedom. In this strategy, re exive muscle co-contractions occur around the ankle joint to maintain the body in the desired position in response to the threat [18,41,42]. In our study, participants were asked to use an ankle strategy rather than a hip strategy.…”

Section: Correlation Analysismentioning

confidence: 99%

A New Postural Stability-Indicator to Predict the Level of Fear of Falling In Parkinson’s Disease Patients

Pourghayoomi

Behzadipour

Ramezani

et al. 2020

Preprint

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Background Fear of falling (FoF) is defined as a lasting concern about falling that causes a person to limit or even stop the daily activities that he/she is capable of. 70% of Parkinson’s disease (PD) patients report activity limitations due to FoF. Timely identification of FoF is critical to prevent its additional adverse effects on the quality of life. Self-report questionnaires are commonly used to evaluate the FoF, which may be prone to human error. Objectives In this study, we attempted to identify a new postural stability-indicator to objectively predict the intensity of FoF and its related behavior(s) in PD patients. Methods Thirty-eight PD patients participated in the study (mean age, 61.2 years), among whom 10 (26.32%) were identified with low FoF and the rest (73.68%) with high FoF, based on Falls Efficacy Scale-International (FES-I). We used a limit of stability task calibrated to each individual and investigated the postural strategies to predict the intensity of FoF. New parameters (FTRi’s; functional time ratio) were extracted based on the center of pressure presence pattern in different rectangular areas (i = 1, 2, and 3). The task was performed on two heights to investigate FoF related behavior(s). Results FTR 1/2 (the ratio between FTR1 and FTR2) was strongly correlated with the FES-I (r = − 0.63, P < 0.001), Pull Test (r = − 0.65, P < 0.001), Timed Up and Go test (r = − 0.57, P < 0.001), and Berg Balance Scale (r = 0.62, P < 0.001). The model of FTR1/2 was identified as a best-fitting model to predicting the intensity of FoF in PD participants (sensitivity = 96.43%, specificity = 80%), using a threshold level of ≤ 2.83. Conclusions Using the proposed assessment technique we can accurately predict the intensity of FoF in PD patients. Also, The FTR1/2 index can be potentially considered as a mechanical biomarker to sense the FoF-related postural instability in PD patients.

show abstract

“…They suggest that after increasing levels of threat, the CNS applies a 'stiffening strategy' [28,34,37] that leads to reducing the degree of freedom. In this strategy, re exive muscle co-contractions occur around the ankle joint to maintain the body in the desired position in response to the threat [17,38,39]. In our study, participants were asked to use an ankle strategy rather than a hip strategy.…”

Section: The Effects Of the Threatening Conditions On Postural Strategiesmentioning

confidence: 99%

A New Postural Stability-Indicator to Predict the Level of Fear of Falling in Parkinson’s Disease Patients

Pourghayoomi

Behzadipour

Ramezani

et al. 2020

Preprint

View full text Add to dashboard Cite

Background: Fear of falling (FoF) is defined as a lasting concern about falling that causes a person to limit or even stop the daily activities that he/she is capable of. Seventy percent of Parkinson’s disease (PD) patients report activity limitations due to FoF. Timely identification of FoF is critical to prevent its additional adverse effects on the quality of life. Self-report questionnaires are commonly used to evaluate the FoF, which may be prone to human error.Objectives: In this study, we attempted to identify a new postural stability-indicator to objectively predict the intensity of FoF and its related behavior(s) in PD patients. Methods: Thirty-eight PD patients participated in the study (mean age, 61.2 years), among whom 10 (26.32%) were identified with low FoF and the rest (73.68%) with high FoF, based on Falls Efficacy Scale-International (FES-I). We used a limit of stability task calibrated to each individual and investigated the postural strategies to predict the intensity of FoF. New parameters (FTRi’s; functional time ratio) were extracted based on the center of pressure presence pattern in different rectangular areas (i = 1, 2, and 3). The task was performed on two heights to investigate FoF related behavior(s). Results: FTR1/2 (the ratio between FTR1 and FTR2) was strongly correlated with the FES-I (r = −0.63, P < 0.001), Pull Test (r = −0.65, p < 0.001), Timed Up and Go test (r = −0.57, p < 0.001), and Berg Balance Scale (r = 0.62, p < 0.001). The model of FTR1/2 was identified as a best-fitting model to predicting the intensity of FoF in PD participants (sensitivity = 96.43%, specificity = 80%), using a threshold level of ≤ 2.83. Conclusions: Using the proposed assessment technique we can accurately predict the intensity of FoF in PD patients. Also, The FTR1/2 index can be potentially considered as a mechanical biomarker to sense the FoF-related postural instability in PD patients.

show abstract

Estimation of stiffening strategy of ankle and hip based on joint sway

Cited by 3 publications

References 6 publications

A new postural stability-indicator to predict the level of fear of falling in Parkinson’s disease patients

A new postural stability-indicator to predict the level of fear of falling in Parkinson’s disease patients

A New Postural Stability-Indicator to Predict the Level of Fear of Falling In Parkinson’s Disease Patients

A New Postural Stability-Indicator to Predict the Level of Fear of Falling in Parkinson’s Disease Patients

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