G80
Conditions
Interventions
Group 1: Procedure on the study day:
- Determination of maximum voluntary contraction (MVC)
- Examination of fascicle dynamics during isometric contractions from rest to MVC using ultrasound video seq
Sponsors
DLR - Institut für Luft- und Raumfahrtmedizin
Eligibility
Sex/Gender
All
Age
8 Years to 18 Years
Inclusion criteria
Inclusion criteria: - Pronounced spasticity of the lower extremities due to infantile cerebral palsy - Sufficient cognitive and coordinative abilities to perform controlled to perform controlled contractions of the plantar flexors - Willingness to participate in the study and to sign the informed consent form themselves or through an authorized person - Height between 1.25 and 1.90 m - Age between 8 and 18 years
Exclusion criteria
Exclusion criteria: - Injuries or illnesses in the last six weeks that affect the Contractions of the calf muscles - Contractures that prevent joint positions of 90° knee flexion and/or neutral position of the upper ankle joint.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| - Force of the plantar flexors, defined as the maximum torque in plantar flexion during maximal voluntary isometric contraction (MVC) during three tests | — |
Secondary
| Measure | Time frame |
|---|---|
| - Muscle activation, defined as the ratio between EMG signal strength and contraction strength (relative to the MVC) during Ramp contractions - Co-contraction, defined as the ratio between the quotient of the EMG signal strength of the dorsal and plantar flexors and the contraction strength contraction strength (relative to the MVC) during ramp contractions - Contraction control, defined as the average control error (difference between actual and target torque values) and standard deviation of the control error during ramp contractions - Fascicle mechanics, defined as fascicle length, curvature and fascicle angle, each in relation to the contraction strength (relative to the to the MVC) during ramp contractions | — |
Countries
Germany
Contacts
Public ContactJule Heieis
DLR - Institut für Luft- und Raumfahrtmedizin
Outcome results
None listed