Frédéric Chorin1, Christophe Cornu2, Bruno Beaune3, Julien Frère3,4, Abderrahmane Rahmani3. 1. Laboratory "Movement, Interactions, Performance" (EA4334), UFR Sciences et Techniques, LUNAM University, University of Maine, Avenue Olivier Messiaen, 72085, Le mans Cedex 9, France. fred.chorin@gmail.com. 2. Laboratory "Movement, Interactions, Performance" (EA 4334), Faculty of Sport Sciences, University of Nantes, Nantes, France. 3. Laboratory "Movement, Interactions, Performance" (EA4334), UFR Sciences et Techniques, LUNAM University, University of Maine, Avenue Olivier Messiaen, 72085, Le mans Cedex 9, France. 4. Laboratory "Développement, Adaptation et Handicap, Régulations cardio-respiratoires et de la motricité" (EA 3450), Faculty of Medicine, University of Lorraine, Nancy, France.
Abstract
BACKGROUND: The sit-to-stand movement requires balance control and coordination between the trunk and lower limbs. For these reasons, it is commonly used in clinics for evaluating lower limb muscle function in the elderly. The aim of the present study was to point out re levant biomechanical and neurophysiological sit-to-stand parameters allowing comparison between elderly fallers and non-fallers. METHODS: Ten elderly fallers and thirty non-fallers performed sit-to-stand movements. Sit-to-stand mechanical (maximal and mean force, impulse) and temporal parameters were measured in the vertical and anteroposterior axes using force platforms. Activity of rectus femoris, vastus lateralis, and gastrocnemius lateralis muscles was bilaterally recorded by surface electromyography. RESULTS: Time to realize sit-to-stand movements was significantly longer in elderly fallers compared to non-fallers (p < 0.05). In the same way, maximal vertical force and mean posterior force applied on force platform were significantly lower (p < 0.05) in fallers than in non-fallers individual. At muscular activity level, results showed a main statistical difference in gastrocnemius lateralis muscle activity patterns between faller and non-faller groups. CONCLUSION: Vertical and anteroposterior data from force platform, and gastrocnemius lateralis muscle activity determined during sit-to-stand movement are the most relevant parameters to differentiate fallers and non-fallers. Moreover, these factors highlight different strategies to rise from a chair between faller and non-faller group, suggesting that fallers would constantly adjust their control balance during the sit-to-stand movement.
BACKGROUND: The sit-to-stand movement requires balance control and coordination between the trunk and lower limbs. For these reasons, it is commonly used in clinics for evaluating lower limb muscle function in the elderly. The aim of the present study was to point out re levant biomechanical and neurophysiological sit-to-stand parameters allowing comparison between elderly fallers and non-fallers. METHODS: Ten elderly fallers and thirty non-fallers performed sit-to-stand movements. Sit-to-stand mechanical (maximal and mean force, impulse) and temporal parameters were measured in the vertical and anteroposterior axes using force platforms. Activity of rectus femoris, vastus lateralis, and gastrocnemius lateralis muscles was bilaterally recorded by surface electromyography. RESULTS: Time to realize sit-to-stand movements was significantly longer in elderly fallers compared to non-fallers (p < 0.05). In the same way, maximal vertical force and mean posterior force applied on force platform were significantly lower (p < 0.05) in fallers than in non-fallers individual. At muscular activity level, results showed a main statistical difference in gastrocnemius lateralis muscle activity patterns between faller and non-faller groups. CONCLUSION: Vertical and anteroposterior data from force platform, and gastrocnemius lateralis muscle activity determined during sit-to-stand movement are the most relevant parameters to differentiate fallers and non-fallers. Moreover, these factors highlight different strategies to rise from a chair between faller and non-faller group, suggesting that fallers would constantly adjust their control balance during the sit-to-stand movement.
Keywords:
Fall; Force platform; Muscular activation; Sit-to-stand strategies
Authors: Ana L Fernandes; Inês Neves; Graciete Luís; Zita Camilo; Bruno Cabrita; Sara Dias; Jorge Ferreira; Paula Simão Journal: Diagnostics (Basel) Date: 2021-01-22
Authors: Daniel Jerez-Mayorga; Álvaro Huerta-Ojeda; Luis Javier Chirosa-Ríos; Francisco Guede-Rojas; Iris Paola Guzmán-Guzmán; Leonardo Intelangelo; Claudia Miranda-Fuentes; Pedro Delgado-Floody Journal: Int J Environ Res Public Health Date: 2021-06-25 Impact factor: 3.390