Drozdova-Statkevičienė Margarita, Česnaitienė Vida Janina, Levin Oron, Pauwels Lisa, Pukėnas Kazimieras, Helsen Werner F, Staes Filip, Masiulis Nerijus
Lithuanian Sports University, Kaunas, LT-44221, Lithuania.
Lithuanian Sports University, Kaunas, LT-44221, Lithuania; KU Leuven, Department of Movement Sciences, Movement Control & Neuroplasticity Research Group, B-3001, Heverlee, Belgium.
Neurosci Lett. 2021 Apr 1;749:135718. doi: 10.1016/j.neulet.2021.135718. Epub 2021 Feb 15.
The effects of acute strength training on balance control were studied in healthy older human men (age-range 60-77y). Participants performed the Tandem Romberg Stance while completing an attention demanding cognitive task (Mathematical Counting) before and after a single acute strength training session applied to the lower limb musculature (experimental group; n = 19) or no intervention (control group; n = 18). Balance stability and the automaticity of balance control were estimated through the calculation of the center-of-pressure (CoP) velocity (Vcop) and the statistical regularity (wavelet entropy) of the CoP trajectory (WEcop), respectively. Training included 3 sets of 3 repetitions of barbell squats using Smith Machine, ranging from 90 % of one repetition maximum (1RM) to 100 % 1RM with 3 min rest between repetitions and 5 min rest between sets. Vcop and WEcop decreased after training (all time main effects, p ≤ 0.028) but group time interactions were not significant (all, p ≥ 0.056). Exploratory analyses revealed that participants in the experimental group showed a significant decrease of Vcop and WEcop in the mediolateral (ML) directions from pre to post [ML Vcop: 15.4 %; Bonferroni-corrected p = 0.048); ML WEcop: 10.5 %; Bonferroni-corrected p = 0.016]. A trend towards a decrease in Vcop and WEcop was also observed in controls, with more prominent gains in the anteroposterior than in the ML direction (Bonferroni-corrected p > 0.2). Overall, findings suggest that acute strength training may improve attentional control of balance along the narrow dimension of the support. Further studies are warranted to examine the specific mechanisms underlying these findings.
在健康老年男性（年龄范围60 - 77岁）中研究了急性力量训练对平衡控制的影响。参与者在对下肢肌肉进行单次急性力量训练之前和之后（实验组；n = 19）或不进行干预（对照组；n = 18）的情况下，在完成一项需要注意力的认知任务（数学计数）时进行串联罗姆伯格姿势测试。分别通过计算压力中心（CoP）速度（Vcop）和CoP轨迹的统计规律性（小波熵）（WEcop）来估计平衡稳定性和平衡控制的自动性。训练包括使用史密斯机进行3组，每组3次杠铃深蹲，重量从一次最大重复量（1RM）的90%到100% 1RM，每组重复之间休息3分钟，组间休息5分钟。训练后Vcop和WEcop降低（所有时间主效应，p≤0.028），但组间时间交互作用不显著（所有，p≥0.056）。探索性分析显示，实验组参与者在训练前后中外侧（ML）方向的Vcop和WEcop显著降低[ML Vcop：15.4%；Bonferroni校正p = 0.048）；ML WEcop：10.5%；Bonferroni校正p = 0.016]。在对照组中也观察到Vcop和WEcop有下降趋势，前后方向的改善比ML方向更明显（Bonferroni校正p>0.2）。总体而言，研究结果表明急性力量训练可能会改善在支撑面狭窄维度上对平衡的注意力控制。有必要进行进一步研究以检查这些发现背后的具体机制。
