此页面是自动翻译的，不保证翻译的准确性。请参阅 英文版 对于源文本。

Targeted Muscle Activation During Strength Training for Children With CP (TACT-CP)

2026年8月28日 更新者：Kaat Desloovere、Universitaire Ziekenhuizen KU Leuven

Targeted Muscle Activation During Strength Training for Children With Cerebral Palsy

Cerebral palsy (CP) is the most common cause of physical disability in children and is associated with muscle weakness, spasticity, and impaired motor control. These impairments often lead to compensatory movement strategies, in which other muscles are recruited or movements are adapted to offload weaker target muscles. Although lower limb strengthening is widely used to improve motor function in children with CP, outcomes remain inconsistent. One potentially important but rarely examined factor is whether the intended muscles are actually activated during training. This study aims to develop and apply an activation-driven assessment protocol that combines individualized exercise selection, real-time electromyography (EMG) biofeedback, and compensation monitoring to identify conditions that promote target-muscle activation while limiting compensatory mechanisms. The focus is on three key muscle groups: hip extensors (HE), knee extensors (KE), and plantar flexors (PF). In this prospective[JV2.1], within-subject repeated-measures study, 30 ambulant children aged 5-12 years with spastic CP and Gross Motor Function Classification System levels I-III will complete three assessment visits in which exercise conditions and feedback strategies are compared using surface EMG and three-dimensional movement analysis.

研究概览

地位

尚未招聘

条件

详细说明

CP causes primary neurological impairments such as spasticity, muscle weakness, and reduced selective motor control. Over time, these impairments contribute to secondary musculoskeletal changes, including muscle contractures and skeletal deformities, which further limit mobility and affect gait. Muscle weakness in CP is multifactorial and results not only from reduced force-generating capacity but also from impaired muscle activation, altered muscle morphology, and biomechanical disadvantages. Consequently, children may compensate through alternative muscle recruitment and altered movement strategies that offload weaker muscles.

Lower limb strength training is a common intervention and has shown benefits for muscle strength, gait, and gross motor function. However, findings across studies are highly variable. One potentially important but rarely examined factor is whether strengthening exercises activate the intended target muscles. Due to impaired selective motor control, children with CP may unintentionally train compensatory muscles rather than the weaker muscles that require strengthening.

To address this limitation, the present study proposes an activation-driven approach to lower limb strengthening. The protocol combines individualized exercise selection, EMG-biofeedback, and explicit management of compensatory mechanisms to promote more selective muscle activation. The ultimate goal is to improve training specificity and support the development of more effective strengthening interventions for children with spastic CP. The study specifically focuses on the gluteus maximus, vastus lateralis, and soleus, as these muscles play a crucial role in gait, are commonly weakened in CP, and may be offloaded through compensatory muscle recruitment.

In this prospective, [JV3.1]within-subject repeated-measures study, 30 ambulant children aged 5-12 years with spastic CP and Gross Motor Function Classification System levels I-III will complete three assessment visits. Visit 1 will evaluate 3-5 bodyweight exercise conditions per muscle group and select up to three individualized conditions based on target-muscle activation and compensatory mechanisms. Visit 2 will compare standardized instruction, patient-tailored verbal feedback, and visual single-target EMG feedback. Visit 3 will compare single-target EMG feedback with dual-target EMG feedback and combined EMG and biomechanical feedback. Surface EMG, three-dimensional motion capture, and force platforms will be used to assess the immediate effects of these conditions on target-muscle activation, compensatory muscle activity, and compensatory movement patterns.

研究类型

观察性的

注册 (估计的)

30

联系人和位置

本节提供了进行研究的人员的详细联系信息，以及有关进行该研究的地点的信息。

学习联系方式

研究联系人备份

学习地点

  • 比利时
    • Vlaams-Brabant
      • Leuven、Vlaams-Brabant、比利时、3000

参与标准

研究人员寻找符合特定描述的人，称为资格标准。这些标准的一些例子是一个人的一般健康状况或先前的治疗。

资格标准

适合学习的年龄

  • 孩子

接受健康志愿者

不

取样方法

非概率样本

研究人群

Children with spastic cerebral palsy, who have routine follow-up care at the CP reference center of the university hospitals Leuven

描述

Inclusion Criteria:

  • Confirmed diagnosis of spastic cerebral palsy
  • Aged 5 - 12 years at the time of inclusion
  • GMFCS level I - III
  • At least 3 months post-injection with Botulinum neurotoxin in muscles relevant to the target or compensatory activation patterns (rationale: there is no expected residual neuromuscular effect of Botulinum neurotoxin injections on muscle activation patterns ≥3 months post Botulinum neurotoxin injection)
  • ≥12 months post lower-limb orthopaedic surgery

Exclusion Criteria:

  • Dyskinetic or ataxic cerebral palsy
  • Severe spasticity (Modified Ashworth ≥3)
  • Severe bony deformities or comorbidities precluding valid assessments
  • Insufficient ability to understand instructions or cooperate with the assessment procedures.

学习计划

本节提供研究计划的详细信息，包括研究的设计方式和研究的衡量标准。

研究是如何设计的？

设计细节

队列和干预

团体/队列
Children with cerebral palsy
Children with spastic cerebral palsy, aged 5-12 years, GMFCS levels I-III

研究衡量的是什么？

主要结果指标

结果测量
措施说明
大体时间
Peak EMG amplitude of the target muscles
大体时间：Assessed across three study visits over approximately 4 weeks.
Peak normalized EMG amplitude during the exercise, used as a measure of maximal targeted activation of the hip extensors (HE), knee extensors (KE), and plantar flexors (PF).
Assessed across three study visits over approximately 4 weeks.
Integrated EMG of the target muscles
大体时间：Assessed across three study visits over approximately 4 weeks.
Integrated normalized EMG over the duration of the complete task or phase of interest, used as a measure of total targeted muscle activation.
Assessed across three study visits over approximately 4 weeks.
Co-activation index
大体时间：Assessed across three study visits over approximately 4 weeks.

Quantification of simultaneous activation of the target muscle and relevant antagonist or compensatory muscle, used to assess co-activation during strengthening exercises.

It is calculated as: Co-activation index (%) = 2 × (Common Area of A and B / (Area of A + Area of B)) × 100 where A and B represent the two muscles being compared. Values range from 0% to 100%, with higher values indicating greater simultaneous muscle activation (co-activation).
Assessed across three study visits over approximately 4 weeks.
Selectivity ratio
大体时间：Assessed across three study visits over approximately 4 weeks.
Integrated EMG of the point-by-point ratio between the time-normalized activation waveform of the target muscle and the corresponding activation waveform of a relevant synergistic or compensatory muscle, used as a measure of target muscle selectivity during the exercise.
Assessed across three study visits over approximately 4 weeks.
Joint angle compensation parameter
大体时间：Assessed across three study visits over approximately 4 weeks.
A predefined joint angle (expressed in °) selected according to the exercise task, used to quantify compensatory movement strategies.
Assessed across three study visits over approximately 4 weeks.
Joint moment compensation parameter
大体时间：Assessed across three study visits over approximately 4 weeks.
A predefined joint moment (expressed in Nm/kg) selected according to the exercise task, used to quantify compensatory movement strategies.
Assessed across three study visits over approximately 4 weeks.
Joint power compensation parameter
大体时间：Assessed across three study visits over approximately 4 weeks.
A predefined joint power (expressed in W/kg) selected according to the exercise task, used to quantify compensatory movement strategies.
Assessed across three study visits over approximately 4 weeks.

次要结果测量

结果测量
措施说明
大体时间
Continuous EMG waveforms
大体时间：Assessed across three study visits over approximately 4 weeks.
Time-normalized EMG waveforms of target, antagonist, and compensatory muscles across the full exercise cycle and relevant task phases.
Assessed across three study visits over approximately 4 weeks.
Continuous joint angle waveforms
大体时间：Assessed across three study visits over approximately 4 weeks.
Time-normalized joint angle waveforms across the full exercise cycle and task-specific phases. Values are expressed in degrees (°) and reported over 0-100% of the exercise cycle.
Assessed across three study visits over approximately 4 weeks.
Continuous joint moment waveforms
大体时间：Assessed across three study visits over approximately 4 weeks.
Time-normalized joint moment waveforms across the full exercise cycle and task-specific phases. Values are expressed in Nm/kg and reported over 0-100% of the exercise cycle.
Assessed across three study visits over approximately 4 weeks.
Continuous joint power waveforms
大体时间：Assessed across three study visits over approximately 4 weeks.
Time-normalized joint power waveforms across the full exercise cycle and task-specific phases. Values are expressed in W/kg and reported over 0-100% of the exercise cycle.
Assessed across three study visits over approximately 4 weeks.
Mean EMG amplitude
大体时间：Assessed across three study visits over approximately 4 weeks.
Mean normalized EMG amplitude of the target muscle during the exercise, expressed as a percentage (%) relative to the reference signal used for EMG normalization.
Assessed across three study visits over approximately 4 weeks.
Muscle activation timing
大体时间：Assessed across three study visits over approximately 4 weeks.
Activation onset and offset timing of the target muscle, determined from the normalized EMG signal and expressed in milliseconds (ms).
Assessed across three study visits over approximately 4 weeks.
Additional co-activation measures
大体时间：Assessed across three study visits over approximately 4 weeks.

Co-activation indices (expressed in %) for other relevant muscle pairs, including agonist-antagonist and proximal-distal muscle combinations. Co-activation is calculated as:

Co-activation Index (%) = 2 × (Common Area of A and B / (Area of A + Area of B)) × 100 where A and B represent the two muscles being compared. Values range from 0% to 100%, with higher values indicating greater simultaneous muscle activation.
Assessed across three study visits over approximately 4 weeks.
Additional selectivity measures
大体时间：Assessed across three study visits over approximately 4 weeks.
Selectivity ratios involving other target, synergistic, antagonist, or compensatory muscles to further describe the specificity of muscle recruitment. The selectivity ratio is calculated as the integrated EMG of the point-by-point ratio between the time-normalized activation waveform of the target muscle and the corresponding activation waveform of the comparison muscle. Values are expressed as a %, with higher values indicating greater selective activation of the target muscle relative to the comparison muscle.
Assessed across three study visits over approximately 4 weeks.
Additional kinematic parameters
大体时间：Assessed across three study visits over approximately 4 weeks.
Exercise-specific kinematic variables, including joint range of motion, peak joint angles, trunk inclination, pelvic movement, knee position, ankle strategy. Values are expressed in degrees (°).
Assessed across three study visits over approximately 4 weeks.
Peak joint moments
大体时间：Assessed across three study visits over approximately 4 weeks.
Exercise-specific peak joint moments. Values are expressed in Nm/kg.
Assessed across three study visits over approximately 4 weeks.
Peak joint powers
大体时间：Assessed across three study visits over approximately 4 weeks.
Exercise-specific peak joint powers. Values are expressed in W/kg.
Assessed across three study visits over approximately 4 weeks.
Movement variability
大体时间：Assessed across three study visits over approximately 4 weeks.
Variability of biomechanical parameters across repeated exercise trials, calculated as the standard deviation of the parameter of interest.
Assessed across three study visits over approximately 4 weeks.
Number of repetitions completed
大体时间：Assessed across three study visits over approximately 4 weeks.
Number of exercise repetitions successfully completed during the exercise task.
Assessed across three study visits over approximately 4 weeks.
Exercise duration parameters
大体时间：Assessed across three study visits over approximately 4 weeks.
Task execution measures including movement duration and task phase duration during strengthening exercises. Values are expressed in seconds.
Assessed across three study visits over approximately 4 weeks.
Task execution success
大体时间：Assessed across three study visits over approximately 4 weeks.
Success of task execution during strengthening exercises, expressed as the proportion of successfully completed repetitions to the total number of attempted repetitions.
Assessed across three study visits over approximately 4 weeks.
Ability to perform the exercise under feedback conditions
大体时间：Assessed across three study visits over approximately 4 weeks.
Ability to perform the exercise across the different feedback conditions, expressed as the proportion of feedback conditions in which the participant is able to complete the exercise.
Assessed across three study visits over approximately 4 weeks.
Maximal isometric strength
大体时间：Assessed across three study visits over approximately 4 weeks.
Maximal voluntary isometric strength of the hip extensors (HE), knee extensors (KE), and plantar flexors (PF), measured with a hand-held dynamometer during the maximal voluntary isometric contraction (MVIC) procedures to characterize participant-specific strength capacity.
Assessed across three study visits over approximately 4 weeks.
Age
大体时间：Collected during screening and/or Visit 1, before the experimental exercise assessments.
Age of the participant at study inclusion (expressed in years).
Collected during screening and/or Visit 1, before the experimental exercise assessments.
Sex
大体时间：Collected during screening and/or Visit 1, before the experimental exercise assessments.
Sex of the participant (male, female, other).
Collected during screening and/or Visit 1, before the experimental exercise assessments.
Gross Motor Function Classification System (GMFCS) level
大体时间：Collected during screening and/or Visit 1, before the experimental exercise assessments.
GMFCS Levels I-III (higher levels indicate greater functional limitation).
Collected during screening and/or Visit 1, before the experimental exercise assessments.
General treatment history
大体时间：Collected during screening and/or Visit 1, before the experimental exercise assessments.
General treatment history relevant to the management of cerebral palsy.
Collected during screening and/or Visit 1, before the experimental exercise assessments.
Previous strength training experience
大体时间：Collected during screening and/or Visit 1, before the experimental exercise assessments.
Previous participation in strength training activities.
Collected during screening and/or Visit 1, before the experimental exercise assessments.
Botulinum neurotoxin history
大体时间：Collected during screening and/or Visit 1, before the experimental exercise assessments.
Previous treatment with botulinum neurotoxin.
Collected during screening and/or Visit 1, before the experimental exercise assessments.
Orthopaedic surgery history
大体时间：Collected during screening and/or Visit 1, before the experimental exercise assessments.
Previous lower-limb orthopaedic surgery.
Collected during screening and/or Visit 1, before the experimental exercise assessments.
Use of orthoses or assistive devices
大体时间：Collected during screening and/or Visit 1, before the experimental exercise assessments.
Current use of orthoses or assistive devices.
Collected during screening and/or Visit 1, before the experimental exercise assessments.

合作者和调查者

在这里您可以找到参与这项研究的人员和组织。

赞助

Universitaire Ziekenhuizen KU Leuven

调查人员

  • 首席研究员：Kaat Desloovere, Prof. dr.、Department of Rehabilitation Sciences, KU Leuven, Belgium

研究记录日期

这些日期跟踪向 ClinicalTrials.gov 提交研究记录和摘要结果的进度。研究记录和报告的结果由国家医学图书馆 (NLM) 审查，以确保它们在发布到公共网站之前符合特定的质量控制标准。

研究主要日期

学习开始 (估计的)

2026年9月1日

初级完成 (估计的)

2029年2月28日

研究完成 (估计的)

2029年2月28日

研究注册日期

首次提交

2026年8月24日

首先提交符合 QC 标准的

2026年8月28日

首次发布 (实际的)

2026年9月2日

研究记录更新

最后更新发布 (实际的)

2026年9月2日

上次提交的符合 QC 标准的更新

2026年8月28日

最后验证

2026年8月1日

更多信息

与本研究相关的术语

关键字

其他相关的 MeSH 术语

其他研究编号

  • S72414

药物和器械信息、研究文件

研究美国 FDA 监管的药品

不

研究美国 FDA 监管的设备产品

不

此信息直接从 clinicaltrials.gov 网站检索，没有任何更改。如果您有任何更改、删除或更新研究详细信息的请求，请联系 register@clinicaltrials.gov. clinicaltrials.gov 上实施更改，我们的网站上也会自动更新.

订阅