The Effectiveness of Active Insoles In Reducing The Impacts of Fatigue on Standing Stability and Balance Among Military Forces: A Biomechanical Evaluation
Introduction: Fatigue, caused by prolonged standing activities, affects postural stability through disrupting somatosensory system functions. The application of sub-threshold mechanical vibration can enhance the sensitivity of the mechanical receptors in the sole of the feet. Improved sensory functi...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | fas |
| Published: |
Tehran University of Medical Sciences
2023-12-01
|
| Series: | بهداشت و ایمنی کار |
| Subjects: | |
| Online Access: | http://jhsw.tums.ac.ir/article-1-6910-en.pdf |
| _version_ | 1797359828555792384 |
|---|---|
| author | Zanyar Karimi Firouz Valipour |
| author_facet | Zanyar Karimi Firouz Valipour |
| author_sort | Zanyar Karimi |
| collection | DOAJ |
| description | Introduction: Fatigue, caused by prolonged standing activities, affects postural stability through disrupting somatosensory system functions. The application of sub-threshold mechanical vibration can enhance the sensitivity of the mechanical receptors in the sole of the feet. Improved sensory function leads to better movement control and balance. Therefore, this study investigated the effectiveness of vibration-based active insoles in reducing the impacts of fatigue on postural stability among military forces.
Material and Methods: Each of the 20 healthy male participants of the study completed three standing balance tests: 1) on both legs, 2) on one leg, and 3) on one leg with a cognitive secondary task for two states of the vibration system (on and off), before and after a fatigue protocol, on a force plate. The activity of leg muscles was also monitored by electromyography (EMG). The mean as a linear index (amount) and the sample entropy (SaEn) as a non-linear index (structure) related to the resultant distance of the body’s center of pressure (CoPRD) displacements, as well as the normalized percentage of the muscle activity level (linear envelope), were used for statistical analyses.
Results: Significant changes in most of the postural and muscular parameters were recorded after the fatigue protocol for the off-mode of the vibration system. Meanwhile, running the vibration system of active insoles was accompanied with no significant differences in the amount and structure of the CoPRD displacements, as well as the activity level of the lateral gastrocnemius and soleus muscles after fatigue, compared to the measurements before fatigue.
Conclusion: The findings confirm the effectiveness of applying sub-threshold mechanical vibration to the sole of the foot in improving standing balance by reducing the negative effects of fatigue on postural stability parameters. Therefore, it is suggested that the use of active insoles can be an effective, feasible, and accessible ergonomic intervention to address fatigue among military forces. |
| first_indexed | 2024-03-08T15:29:24Z |
| format | Article |
| id | doaj.art-636a3141471f44459b5580d876d60f07 |
| institution | Directory Open Access Journal |
| issn | 2251-807X 2383-2088 |
| language | fas |
| last_indexed | 2024-03-08T15:29:24Z |
| publishDate | 2023-12-01 |
| publisher | Tehran University of Medical Sciences |
| record_format | Article |
| series | بهداشت و ایمنی کار |
| spelling | doaj.art-636a3141471f44459b5580d876d60f072024-01-10T06:27:07ZfasTehran University of Medical Sciencesبهداشت و ایمنی کار2251-807X2383-20882023-12-01134797816The Effectiveness of Active Insoles In Reducing The Impacts of Fatigue on Standing Stability and Balance Among Military Forces: A Biomechanical EvaluationZanyar Karimi0Firouz Valipour1 Department of Ergonomics, School of Public Health, Urmia University of Medical Sciences, Urmia, Iran Occupational Health Department, Faculty of Health, Baqiyatallah University of Medical Sciences, Tehran, Iran Introduction: Fatigue, caused by prolonged standing activities, affects postural stability through disrupting somatosensory system functions. The application of sub-threshold mechanical vibration can enhance the sensitivity of the mechanical receptors in the sole of the feet. Improved sensory function leads to better movement control and balance. Therefore, this study investigated the effectiveness of vibration-based active insoles in reducing the impacts of fatigue on postural stability among military forces. Material and Methods: Each of the 20 healthy male participants of the study completed three standing balance tests: 1) on both legs, 2) on one leg, and 3) on one leg with a cognitive secondary task for two states of the vibration system (on and off), before and after a fatigue protocol, on a force plate. The activity of leg muscles was also monitored by electromyography (EMG). The mean as a linear index (amount) and the sample entropy (SaEn) as a non-linear index (structure) related to the resultant distance of the body’s center of pressure (CoPRD) displacements, as well as the normalized percentage of the muscle activity level (linear envelope), were used for statistical analyses. Results: Significant changes in most of the postural and muscular parameters were recorded after the fatigue protocol for the off-mode of the vibration system. Meanwhile, running the vibration system of active insoles was accompanied with no significant differences in the amount and structure of the CoPRD displacements, as well as the activity level of the lateral gastrocnemius and soleus muscles after fatigue, compared to the measurements before fatigue. Conclusion: The findings confirm the effectiveness of applying sub-threshold mechanical vibration to the sole of the foot in improving standing balance by reducing the negative effects of fatigue on postural stability parameters. Therefore, it is suggested that the use of active insoles can be an effective, feasible, and accessible ergonomic intervention to address fatigue among military forces.http://jhsw.tums.ac.ir/article-1-6910-en.pdfactive insolesmechanical vibrationfatiguepostural stabilitymilitary forces |
| spellingShingle | Zanyar Karimi Firouz Valipour The Effectiveness of Active Insoles In Reducing The Impacts of Fatigue on Standing Stability and Balance Among Military Forces: A Biomechanical Evaluation بهداشت و ایمنی کار active insoles mechanical vibration fatigue postural stability military forces |
| title | The Effectiveness of Active Insoles In Reducing The Impacts of Fatigue on Standing Stability and Balance Among Military Forces: A Biomechanical Evaluation |
| title_full | The Effectiveness of Active Insoles In Reducing The Impacts of Fatigue on Standing Stability and Balance Among Military Forces: A Biomechanical Evaluation |
| title_fullStr | The Effectiveness of Active Insoles In Reducing The Impacts of Fatigue on Standing Stability and Balance Among Military Forces: A Biomechanical Evaluation |
| title_full_unstemmed | The Effectiveness of Active Insoles In Reducing The Impacts of Fatigue on Standing Stability and Balance Among Military Forces: A Biomechanical Evaluation |
| title_short | The Effectiveness of Active Insoles In Reducing The Impacts of Fatigue on Standing Stability and Balance Among Military Forces: A Biomechanical Evaluation |
| title_sort | effectiveness of active insoles in reducing the impacts of fatigue on standing stability and balance among military forces a biomechanical evaluation |
| topic | active insoles mechanical vibration fatigue postural stability military forces |
| url | http://jhsw.tums.ac.ir/article-1-6910-en.pdf |
| work_keys_str_mv | AT zanyarkarimi theeffectivenessofactiveinsolesinreducingtheimpactsoffatigueonstandingstabilityandbalanceamongmilitaryforcesabiomechanicalevaluation AT firouzvalipour theeffectivenessofactiveinsolesinreducingtheimpactsoffatigueonstandingstabilityandbalanceamongmilitaryforcesabiomechanicalevaluation AT zanyarkarimi effectivenessofactiveinsolesinreducingtheimpactsoffatigueonstandingstabilityandbalanceamongmilitaryforcesabiomechanicalevaluation AT firouzvalipour effectivenessofactiveinsolesinreducingtheimpactsoffatigueonstandingstabilityandbalanceamongmilitaryforcesabiomechanicalevaluation |