Velocity-based training affects function, strength, and power in persons with Parkinson’s disease.

Background Velocity-based training (VBT) is a unique new resistance-training technique, typically used by high-level athletes, which uses changes in velocity rather than load to dictate progressions. No study has examined the effects of VBT on performance in persons with Parkinson’s Disease (PD). Objective To compare the effects of 10% and 30% velocity threshold protocols on changes in functional performance, strength, and power in persons with PD following 12 weeks of supervised VBT, three days per week. Methods Participants were recruited from a university population and from individuals residing in surrounding neighborhoods using flyers, and from an existing phone list of persons interested in participation. Data collected before and after training included the 6-m walk test at habitual and maximal gait speed, the 5 time sit-to-stand test (5xSTS), 1 repetition maximum (1RM) testing for both the chest-press (CP) and leg-press (LP) exercise, and power testing for the CP and LP. Results Data from 16 subjects was collected for the analysis. Significant time effects were seen for the 6-m walk test at maximal speed, 5xSTS, 1RM for both CP and LP and peak power (PP) for the LP exercise. Secondary analyses revealed time effects for 5xSTS power, and the load at which PP was achieved for the CP exercise. A Wilcoxon signed rank test revealed no significant differences in the percentage of 1RM at which peak power was achieved for either condition. Conclusion Results indicate that VBT is an effective training modality for improving functional capability, strength, and power in persons with PD. All data was collected by graduate researchers at the University of Miami. All measures were taken as pre- and post-measurements before and after a velocity-based training intervention using resistance training in persons affected with Parkinson's Disease. Measures included functional strength, and power testing. Subjects came into the laboratory 3 times a week for 8 weeks to train under the supervision of undergraduate and graduate research assistants using computerized pneumatic resistance training machines (HUR Inc, Park Ridge, IL, USA). The “VelCode” column represents the two different conditions used to run the repeated measures. All subjects used velocity-based training, however the groups utilized two different deficits in order to train. The load-based group utilized a 30% deficit in velocity to determine progression, and the velocity-based group utilized a 10% deficit. All variables are listed with either the suffix “Pre” or “Post” to distinguish the two different time points used in the repeated measures. Missing data is due to injury, refusal to complete a test at maximal effort, or absence of subjects from testing.**研究背景** 基于速度训练（Velocity-based Training, VBT）是一种新兴的独特抗阻训练技术，通常应用于高水平运动员群体，其通过速度变化而非负荷量设定训练进阶方案。目前尚无研究探讨基于速度训练对帕金森病（Parkinson’s Disease, PD）患者运动表现的影响。 **研究目的** 本研究旨在对比每周3次、为期12周的监督式基于速度训练后，10%与30%速度阈值方案对帕金森病患者的功能表现、肌力与爆发力变化的影响。 **研究方法** 本研究通过传单招募、现有感兴趣参与者电话名单，从大学人群及周边社区居民中招募受试者。训练前后采集的评估指标包括：惯常步速与最大步速下的6米步行测试、5次坐站测试（5xSTS）、卧推（chest-press, CP）与腿举（leg-press, LP）的1次最大重复重量（1 repetition maximum, 1RM）测试，以及卧推与腿举的爆发力测试。 **研究结果** 本研究共纳入16名受试者的数据用于分析。结果显示，最大步速6米步行测试、5次坐站测试、卧推与腿举的1次最大重复重量，以及腿举的峰值功率（peak power, PP）均存在显著的时间主效应。次级分析显示，5次坐站测试的爆发力、卧推达到峰值功率时对应的负荷量同样存在时间主效应。Wilcoxon符号秩检验结果表明，两种条件下达到峰值功率对应的1RM百分比均无显著差异。 **研究结论** 结果表明，基于速度训练是一种可有效改善帕金森病患者功能能力、肌力与爆发力的训练方式。 本研究所有数据均由迈阿密大学的研究生研究人员采集。所有评估指标均为帕金森病患者接受抗阻训练类基于速度训练干预前后的前后测数据，评估内容包括功能肌力与爆发力测试。受试者每周3次前往实验室，在本科与研究生研究助理的监督下，使用计算机控制气动抗阻训练器械（美国伊利诺伊州帕克里奇市HUR公司）进行训练。 "VelCode"列代表本研究重复测量设计中使用的两种不同实验条件。所有受试者均接受基于速度训练，但两组采用了不同的速度亏损阈值以设定训练进阶方案：负荷调控组采用30%的速度亏损值来确定训练进阶，速度调控组采用10%的速度亏损值。所有变量均带有"Pre"或"Post"后缀，以区分重复测量设计中的两个时间节点（训练前与训练后）。 缺失数据的原因包括受试者受伤、拒绝完成最大强度测试，或未能到场参与测试。