Department of Health and Rehabilitation, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
Exercise Biology, Department of Public Health, Aarhus University, Denmark.
J Musculoskelet Neuronal Interact. 2022 Dec 1;22(4):486-497.
This study investigated the effect of lower limb immobilization and retraining on postural control and muscle power in healthy old and young men.
Twenty men, nine old (OM:67.3±4.4 years) and eleven young (YM:24.4±1.6 years) underwent 2 weeks of unilateral whole-leg casting, followed by 4 weeks of retraining. Measures included center of pressure (CoP) sway length and area during single- and double-leg stance, maximal leg extensor muscle power, habitual and maximal 10-m gait speed, sit-to-stand performance, and 2-min step test.
After immobilization, leg extension muscle power decreased by 15% in OM (from 2.68±0.60 to 2.29±0.63 W/kg, p<0.05) and 17% in YM (4.37±0.76 to 3.63±0.69 W/kg, p<0.05). Double-leg CoP sway area increased by 45% in OM (218±82 to 317±145 mm; p<0.05), with no change in YM (p=0.43). Physical function did not change after immobilization but sit-to-stand performance (+20%, p<0.05) and 2-min step test (+28%, p<0.05) increased in OM following retraining. In both groups, all parameters returned to baseline levels after retraining.
Two weeks of lower limb immobilization led to decreases in maximal muscle power in both young and old, whereas postural control was impaired selectively in old men. All parameters were restored in both groups after 4 weeks of resistance-based retraining.
本研究旨在探讨下肢固定和再训练对健康老年和青年男性姿势控制和肌肉力量的影响。
20 名男性，9 名老年（OM：67.3±4.4 岁）和 11 名青年（YM：24.4±1.6 岁）接受了 2 周的单侧全腿石膏固定，随后进行了 4 周的再训练。测量指标包括单腿和双腿站立时的中心压力（CoP）摆动长度和面积、最大腿部伸肌力量、习惯性和最大 10 米步行速度、从座位到站立的表现以及 2 分钟踏步测试。
固定后，老年组（从 2.68±0.60 降至 2.29±0.63 W/kg，p<0.05）和青年组（从 4.37±0.76 降至 3.63±0.69 W/kg，p<0.05）的腿部伸肌力量分别下降了 15%和 17%。老年组（从 218±82 增加到 317±145 mm；p<0.05）的双腿 CoP 摆动面积增加了 45%，青年组（p=0.43）无变化。固定后身体功能无变化，但老年组（从 20%，p<0.05）的从座位到站立的表现和 2 分钟踏步测试（从 28%，p<0.05）增加，随后再训练后恢复到基线水平。
2 周的下肢固定导致青年和老年的最大肌肉力量下降，而姿势控制仅在老年男性中受损。所有参数在 4 周的基于阻力的再训练后在两组中均得到恢复。
