Torres-Banduc Maximiliano, Jerez-Mayorga Daniel, Chirosa-Ríos Luis, Chirosa-Ríos Ignacio
Department of Physical Education and Sports, Faculty of Sports Sciences, University of Granada, Granada, Spain; Escuela de Kinesiología, Facultad de Ciencias de la Salud, Universidad de Las Américas, Viña Del Mar, Chile; Escuela de Ciencias de la Salud, Universidad de Viña del Mar, Chile.
Department of Physical Education and Sports, Faculty of Sports Sciences, University of Granada, Granada, Spain; Exercise and Rehabilitation Sciences Institute, School of Physical Therapy, Faculty of Rehabilitation Sciences, Universidad Andres Bello, Santiago, Chile.
Physiol Behav. 2024 Sep 1;283:114618. doi: 10.1016/j.physbeh.2024.114618. Epub 2024 Jun 18.
to explore lower limb muscle activity concerning limb dominance, as well as variations in force and power during the standing up and sitting down phases of the instrumented sit-to-stand-to-sit test in sedentary individuals, across isokinetic and isotonic modalities.
33 sedentary individuals underwent testing using a functional electromechanical dynamometer in both isokinetic and isotonic modes, accompanied by surface electromyography.
In the isokinetic mode, the non-dominant gastrocnemius medialis and vastus medialis exhibited significantly (p < 0.05) higher muscle activity values during the standing up and sitting down phase compared to dominant counterparts. In the isotonic mode standing up phase, significant differences in muscle activity were noted for non-dominant gastrocnemius medialis, vastus medialis, and biceps femoris compared to their dominant counterparts. The sitting down phase in isotonic mode showed higher muscle activity for non-dominant vastus medialis compared to dominant vastus medialis. Regard to performance outcomes, significantly lower (p < 0.0001) values were observed for standing up (12.7 ± 5.1 N/kg) compared to sitting down (15.9 ± 6.1 N/kg) peak force, as well as for standing up (18.7 ± 7.8 W/kg) compared to sitting down (25.9 ± 9.7 W/kg) peak power in isokinetic mode. In isotonic mode, lower values were found for sitting down (6.5 (6.3-7.1) N/kg) compared to standing up (7.8 (7.3-8.9) N/kg) peak force and for sitting down (18.5 (13.2-21.7) W/kg) compared to standing up (33.7 (22.8-41.6) W/kg) peak power.
Limb dominance influences lower-limb muscle activity during the instrumented sit-to-stand-to-sit test, and the choice of testing mode (isokinetic or isotonic) affects muscle engagement and performance outcomes.
探讨在久坐不动的个体中，关于肢体优势的下肢肌肉活动情况，以及在使用仪器进行坐立-坐测试的起立和坐下阶段，等速和等张模式下的力量和功率变化。
33名久坐不动的个体在等速和等张模式下使用功能性电动测力计进行测试，并同时进行表面肌电图检查。
在等速模式下，非优势侧的内侧腓肠肌和股内侧肌在起立和坐下阶段的肌肉活动值显著高于优势侧（p < 0.05）。在等张模式的起立阶段，非优势侧的内侧腓肠肌、股内侧肌和股二头肌与优势侧相比，肌肉活动存在显著差异。在等张模式的坐下阶段，非优势侧的股内侧肌比优势侧的股内侧肌表现出更高的肌肉活动。关于性能结果，在等速模式下，起立阶段（12.7 ± 5.1 N/kg）的峰值力明显低于坐下阶段（15.9 ± 6.1 N/kg），起立阶段（18.7 ± 7.8 W/kg）的峰值功率也明显低于坐下阶段（25.9 ± 9.7 W/kg）。在等张模式下，坐下阶段（6.5（6.3 - 7.1）N/kg）的峰值力低于起立阶段（7.8（7.3 - 8.9）N/kg），坐下阶段（18.5（13.2 - 21.7）W/kg）的峰值功率低于起立阶段（33.7（22.8 - 41.6）W/kg）。
在使用仪器进行坐立-坐测试期间，肢体优势会影响下肢肌肉活动，并且测试模式（等速或等张）的选择会影响肌肉参与度和性能结果。
