Targeted Muscle Activation During Strength Training for Children With CP (TACT-CP)
Targeted Muscle Activation During Strength Training for Children With Cerebral Palsy
Studienübersicht
Status
Status
Bedingungen
Bedingungen
Detaillierte Beschreibung
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.
Studientyp
Studientyp
Einschreibung (Geschätzt)
Einschreibung
Kontakte und Standorte
Studienkontakt
Studienkontakt
- Name: Jolien Vanloocke
- Telefonnummer: +32 16 34 10 16
- E-Mail: jolien.vanloocke@kuleuven.be
Studieren Sie die Kontaktsicherung
- Name: Julie Stegen
- E-Mail: julie.stegen@kuleuven.be
Studienorte
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Vlaams-Brabant
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Leuven, Vlaams-Brabant, Belgien, 3000
- UZ Leuven
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Kontakt:
- Kaat Desloovere, prof. dr.
- Telefonnummer: +3216338009
- E-Mail: kaat.desloovere@kuleuven.be
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Teilnahmekriterien
Zulassungskriterien
Zulassungskriterien
Studienberechtigtes Alter
- Kind
Akzeptiert gesunde Freiwillige
Probenahmeverfahren
Studienpopulation
Beschreibung
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.
Studienplan
Wie ist die Studie aufgebaut?
Designdetails
Anzahl der Gruppen / Kohorten
Kohorten und Interventionen
Gruppe / KohorteGruppe / Kohorte |
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Children with cerebral palsy
Children with spastic cerebral palsy, aged 5-12 years, GMFCS levels I-III
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Was misst die Studie?
Primäre Ergebnismessungen
Primäre Ergebnismessungen
Ergebnis Maßnahme |
Maßnahmenbeschreibung |
Zeitfenster |
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Peak EMG amplitude of the target muscles
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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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).
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Assessed across three study visits over approximately 4 weeks.
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Integrated EMG of the target muscles
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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Integrated normalized EMG over the duration of the complete task or phase of interest, used as a measure of total targeted muscle activation.
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Assessed across three study visits over approximately 4 weeks.
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Co-activation index
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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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.
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Selectivity ratio
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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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.
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Assessed across three study visits over approximately 4 weeks.
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Joint angle compensation parameter
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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A predefined joint angle (expressed in °) selected according to the exercise task, used to quantify compensatory movement strategies.
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Assessed across three study visits over approximately 4 weeks.
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Joint moment compensation parameter
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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A predefined joint moment (expressed in Nm/kg) selected according to the exercise task, used to quantify compensatory movement strategies.
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Assessed across three study visits over approximately 4 weeks.
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Joint power compensation parameter
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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A predefined joint power (expressed in W/kg) selected according to the exercise task, used to quantify compensatory movement strategies.
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Assessed across three study visits over approximately 4 weeks.
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Sekundäre Ergebnismessungen
Sekundäre Ergebnismessungen
Ergebnis Maßnahme |
Maßnahmenbeschreibung |
Zeitfenster |
|---|---|---|
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Continuous EMG waveforms
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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Time-normalized EMG waveforms of target, antagonist, and compensatory muscles across the full exercise cycle and relevant task phases.
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Assessed across three study visits over approximately 4 weeks.
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Continuous joint angle waveforms
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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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.
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Assessed across three study visits over approximately 4 weeks.
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Continuous joint moment waveforms
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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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.
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Assessed across three study visits over approximately 4 weeks.
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Continuous joint power waveforms
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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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.
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Assessed across three study visits over approximately 4 weeks.
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Mean EMG amplitude
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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Mean normalized EMG amplitude of the target muscle during the exercise, expressed as a percentage (%) relative to the reference signal used for EMG normalization.
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Assessed across three study visits over approximately 4 weeks.
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Muscle activation timing
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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Activation onset and offset timing of the target muscle, determined from the normalized EMG signal and expressed in milliseconds (ms).
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Assessed across three study visits over approximately 4 weeks.
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Additional co-activation measures
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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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.
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Additional selectivity measures
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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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.
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Assessed across three study visits over approximately 4 weeks.
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Additional kinematic parameters
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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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 (°).
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Assessed across three study visits over approximately 4 weeks.
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Peak joint moments
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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Exercise-specific peak joint moments.
Values are expressed in Nm/kg.
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Assessed across three study visits over approximately 4 weeks.
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Peak joint powers
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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Exercise-specific peak joint powers.
Values are expressed in W/kg.
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Assessed across three study visits over approximately 4 weeks.
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Movement variability
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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Variability of biomechanical parameters across repeated exercise trials, calculated as the standard deviation of the parameter of interest.
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Assessed across three study visits over approximately 4 weeks.
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Number of repetitions completed
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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Number of exercise repetitions successfully completed during the exercise task.
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Assessed across three study visits over approximately 4 weeks.
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Exercise duration parameters
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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Task execution measures including movement duration and task phase duration during strengthening exercises.
Values are expressed in seconds.
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Assessed across three study visits over approximately 4 weeks.
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Task execution success
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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Success of task execution during strengthening exercises, expressed as the proportion of successfully completed repetitions to the total number of attempted repetitions.
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Assessed across three study visits over approximately 4 weeks.
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Ability to perform the exercise under feedback conditions
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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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.
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Assessed across three study visits over approximately 4 weeks.
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Maximal isometric strength
Zeitfenster: Assessed across three study visits over approximately 4 weeks.
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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.
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Assessed across three study visits over approximately 4 weeks.
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Age
Zeitfenster: Collected during screening and/or Visit 1, before the experimental exercise assessments.
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Age of the participant at study inclusion (expressed in years).
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Collected during screening and/or Visit 1, before the experimental exercise assessments.
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Sex
Zeitfenster: Collected during screening and/or Visit 1, before the experimental exercise assessments.
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Sex of the participant (male, female, other).
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Collected during screening and/or Visit 1, before the experimental exercise assessments.
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Gross Motor Function Classification System (GMFCS) level
Zeitfenster: Collected during screening and/or Visit 1, before the experimental exercise assessments.
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GMFCS Levels I-III (higher levels indicate greater functional limitation).
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Collected during screening and/or Visit 1, before the experimental exercise assessments.
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General treatment history
Zeitfenster: Collected during screening and/or Visit 1, before the experimental exercise assessments.
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General treatment history relevant to the management of cerebral palsy.
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Collected during screening and/or Visit 1, before the experimental exercise assessments.
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Previous strength training experience
Zeitfenster: Collected during screening and/or Visit 1, before the experimental exercise assessments.
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Previous participation in strength training activities.
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Collected during screening and/or Visit 1, before the experimental exercise assessments.
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Botulinum neurotoxin history
Zeitfenster: Collected during screening and/or Visit 1, before the experimental exercise assessments.
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Previous treatment with botulinum neurotoxin.
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Collected during screening and/or Visit 1, before the experimental exercise assessments.
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Orthopaedic surgery history
Zeitfenster: Collected during screening and/or Visit 1, before the experimental exercise assessments.
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Previous lower-limb orthopaedic surgery.
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Collected during screening and/or Visit 1, before the experimental exercise assessments.
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Use of orthoses or assistive devices
Zeitfenster: Collected during screening and/or Visit 1, before the experimental exercise assessments.
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Current use of orthoses or assistive devices.
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Collected during screening and/or Visit 1, before the experimental exercise assessments.
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Mitarbeiter und Ermittler
Sponsor
Sponsor
Ermittler
Ermittler
- Hauptermittler: Kaat Desloovere, Prof. dr., Department of Rehabilitation Sciences, KU Leuven, Belgium
Studienaufzeichnungsdaten
Haupttermine studieren
Studienbeginn (Geschätzt)
Studienbeginn
Primärer Abschluss (Geschätzt)
Primärer Abschluss
Studienabschluss (Geschätzt)
Studienabschluss
Studienanmeldedaten
Zuerst eingereicht
Zuerst eingereicht
Zuerst eingereicht, das die QC-Kriterien erfüllt hat
Zuerst eingereicht, das die QC-Kriterien erfüllt hat
Zuerst gepostet (Tatsächlich)
Zuerst gepostet
Studienaufzeichnungsaktualisierungen
Letztes Update gepostet (Tatsächlich)
Letztes Update gepostet
Letztes eingereichtes Update, das die QC-Kriterien erfüllt
Letztes eingereichtes Update, das die QC-Kriterien erfüllt
Zuletzt verifiziert
Zuletzt verifiziert
Mehr Informationen
Begriffe im Zusammenhang mit dieser Studie
Schlüsselwörter
Zusätzliche relevante MeSH-Bedingungen
Andere Studien-ID-Nummern
Andere Studien-ID-Nummern
- S72414
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Studiert ein von der US-amerikanischen FDA reguliertes Arzneimittelprodukt
Studiert ein von der US-amerikanischen FDA reguliertes Geräteprodukt
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