Notes on Augmented Pediatric CIMT Camp with Hocoma ArmeoVR Spring Pediatric for Hemiplegic CP
Background and rationale
Cerebral palsy (CP) is a group of permanent motor disorders originating in early brain development, often resulting in upper limb impairment and activity limitations, particularly in hemiplegic CP (hCP).
Constraint Induced Movement Therapy (CIMT) and its pediatric version (P-CIMT) aim to improve use of the affected hand by restraining the non-affected hand and providing intensive, task-focused practice with shaping strategies.
Virtual reality (VR) and game-based activities can boost motivation and repetition during repetitive training.
There is variability and gaps in how P-CIMT is delivered, with barriers including resources, clinician training, and fidelity to core components. Integrating VR with CIMT could enhance intensity and engagement.
Hocoma ArmeoVR Spring Pediatric combines an exoskeleton (gravitational/assistive support) with VR games to facilitate repetitive, goal-directed hand movement in children.
Aim and hypotheses
Primary aim: determine feasibility, acceptability, and effects of a pediatric CIMT (P-CIMT) camp augmented with the Hocoma ArmeoVR Spring Pediatric for children with hCP on bimanual hand function.
Secondary aims: assess effects on unilateral hand function and occupational performance.
Hypotheses: the augmented P-CIMT camp would be feasible and accepted; hand function and occupational performance would improve, with benefits persisting at 6 months.
Study design and setting
Design: single-group clinical trial (no control group or randomization).
Setting: two-week, camp-based program conducted summers 2014–2018 at a children’s hospital in the southern United States.
Participants: 32 recruited; 1 dropped out (transportation); final baseline/post-intervention sample N = 31; 6-month follow-up available for N = 22.
Ethical considerations: approvals from participating institutions; written informed consent from guardians and assent for children 10–15 years old; de-identified results for publication.
Participants and eligibility
Age: mean 9 years 3 months (range 5–15 years).
Sex: 16 boys (51.6%).
Affected side: right side in 17 (54.8%).
MACS (Manual Ability Classification Scale) distribution: I = 8 (25.8%), II = 20 (64.5%), III = 3 (9.7%).
Inclusion criteria: diagnosis of hCP, age 5–15, able to attend daily, fluent English for directions, MACS I–III.
Exclusion criteria: significant visual impairment or uncontrolled seizures.
Recruitment and consent: consistent with institutional review processes; guardians provided consent; children provided assent when appropriate.
Intervention: augmented P-CIMT camp
Core components aligned with CIMT principles: constraint of the non-affected limb, unilateral task practice with shaping, repetition, and progression of task difficulty.
Augmentation with ArmeoVR Spring Pediatric: 30 minutes per day of ArmeoVR training (exoskeleton-assisted, VR-based upper-limb games).
Daily routine and structure: six hours per day, 9:00–3:00, over two weeks (60 hours total); 50 hours unilateral task practice + 10 hours bimanual training; restraint worn ~5.5 hours/day with 30 minutes ArmeoVR included; constraint removed for toileting and end of day; last day without constraint to promote transfer to bimanual activities.
Theme-based, group-based delivery: pirate theme to enhance motivation; camp manual to standardize delivery across years; trained interventionists supervised by OTs.
Interventionists: college students or similar, with at least 8 hours CIMT/ArmeoVR training prior to camp and 1–2 hours daily for prep; ongoing supervision by experienced OTs.
Just-right challenge: ArmeoVR sessions tailored to shoulder flexion/extension, abduction/adduction, elbow flexion/extension, forearm pronation/supination, grip strength; game selection to match movement goals; rotation schedule to prevent missed activities.
Token system to promote engagement: pirate coins and pirate chest prizes exchanged at day’s end.
Last day: no constraint to facilitate integration of unilateral skills into bimanual tasks.
Primary and secondary outcomes assessed at baseline (pre), post-intervention, and 6 months post-intervention by two non-blinded OTs.
What was delivered per day and schedule (examples)
Schedule included bimanual stations, gross motor outside activities, fine motor stations, group strategy games, and a daily “ArmeoVR 30 minutes” block.
Daily activities emphasized upper-arm movement, reach, sensation, grasp/release, finger movements, wrist/forearm movements, and social/engagement opportunities.
The final day focused on integrating unilateral skills into bimanual performance without wearing the constraint.
Outcome measures and data collection
Primary outcome: Assisting Hand Assessment (AHA)
Purpose: assess bimanual performance in children with CP; valid/reliable; 22 items; age 18 months–12 years.
Scoring: raw scores converted to 0–100 logit-based AHA units.
Reliability: high inter-rater and intra-rater reliability.
Minimal detectable difference: 5 AHA units (SDD = 5) indicating true change.
Secondary outcomes:
Melbourne Assessment of Unilateral Hand Function (MUUL): measures unilateral hand function quality (range, dexterity, etc.) in neurological conditions; clinically significant change ≈ 12 points.
Canadian Occupational Performance Measure (COPM): client-centered outcomes for occupational performance; assesses performance and satisfaction; change of ≥ 2 points is clinically significant.
Qualitative outcome: 4-point Likert rating (1 = not at all, 2 = only a little, 3 = some, 4 = a lot) to capture experiences during ArmeoVR training; qualitative comments collected from participants; observations by two OTs; 32 observations over two weekly sessions (Tuesday and Thursday) with average of two raters.
Descriptive experience data: mean motivation, engagement, enjoyment, and frustration (Likert 1–4).
Statistical analysis plan
Data checks for parametric assumptions; conducted several one-way repeated-measures ANOVAs to examine time effects (pre, post, 6 months).
Post-hoc comparisons: Least Significant Difference (LSD) tests due to small sample size.
Software: SPSS version 25.
Significance: p < .05; effect size reported as partial eta-squared (g^2) in the study, e.g., g^2 = .61 for AHA time effect.
Note on sample for analyses: 31 baseline/post; 22 completed 6-month follow-up; analyses for each outcome used available data per time point.
Key results
Primary outcome: AHA (bimanual performance)
Means (with SD): baseline ; post-intervention ; 6 months .
Time effect: F(2,60) = 46.12,\ p < 0.001,\ ag{g^2} = 0.61.
Post-hoc: post > baseline, and 6 months > baseline (each p < 0.001); post vs 6 months not significantly different (p = 0.34).
Mean changes: baseline to post + AHA units; baseline to 6 months + AHA units.
Clinically meaningful change: AHA change ≥ units; the observed changes meet this threshold, indicating clinically meaningful improvement.
Secondary outcome: MUUL (unilateral hand function)
Means (SD): baseline ; post ; 6 months .
Time effect: F(2,60) = 15.33,\ p < 0.001,\ ag{g^2} = 0.34.
Post-hoc: post > baseline (p < 0.001); 6 months > baseline (p < 0.001).
Baseline to post change: + points; baseline to 6 months: + points.
Clinically significant change for MUUL ≈ points; the observed changes were significant statistically but not clinically (per MUUL threshold).
COPM outcomes (occupational performance)
COPM Satisfaction: baseline ; post ; 6 months .
COPM Performance: baseline ; post ; 6 months .
Time effects: Satisfaction and Performance both show strong time effects; for both, F(2,58) \\approx 135.35, p<0.001, g^2 \\approx 0.82 (Satisfaction) and F(2,58) \\approx 114.35, p<0.001, g^2 \\approx 0.80 (Performance).
Post-hoc: both measures increased from baseline to post and remained elevated at 6 months with no further increase.
Clinically significant change: baseline to post change for Satisfaction = +4.3 points; baseline to post change for Performance = +3.9 points; both are clinically meaningful given a ≥2-point threshold.
Qualitative and experiential findings
Motivation: mean 3.7; Engagement: 3.8; Enjoyment: 3.6; Frustration: 1.9 (on a 1–4 scale).
Positive participant feedback: quotes like “I like this thing ( Hocoma ArmeoVR Spring) a lot,” “I am awesome at video games! I love this racing car game so much!”
Observations: most participants showed motivation, engagement, and enjoyment; only 3 negative comments tied to game difficulty, which were addressed by adjusting the game level to provide a just-right challenge.
Description of the constraint and safety considerations
Constraint details: long arm ulnar gutter splint made from 1/16-inch aquaplast, extending from shoulder to fingertips with elbow at 90 degrees; secured with vel-foam strapping.
Daily use: worn by participants for five and a half hours per day; removed for toileting and end of day; not worn on the final day to facilitate transfer to bimanual activities.
Administered by a trained OT or interventionist; safety and fit checked daily.
Data interpretation and integration with existing evidence
The augmented P-CIMT camp produced clinically and statistically significant improvements in bimanual function (AHA) and COPM measures, with gains sustained at 6 months.
Unilateral hand function (MUUL) improved statistically but not meeting the clinical threshold, likely due to the camp emphasizing functional, activity-based use of the limb rather than isolated joint positioning or precision tasks.
The combination of a manualized 60-hour CIMT protocol with ArmeoVR may provide higher intensity of practice and augmented feedback (visual/auditory) that supports motor learning and engagement beyond CIMT alone.
Comparisons with prior P-CIMT literature (Cochrane review and related trials):
Prior studies varied widely in age, dosage, delivery (group vs individualized), and outcomes; mean AHA changes ranged from approximately -2.0 to 11.7 logits across 14 studies that used AHA as an outcome measure.
Our study’s mean AHA change from baseline to post (7.0 logits) and to 6 months (6.4 logits) compares favorably with similar-dosage studies (e.g., Sakzewski et al., 2011) but shows larger gains, possibly due to ArmeoVR augmentation and a highly structured, manualized protocol.
The ArmeoVR may provide additional external feedback and adaptive difficulty that enhances repetition and motivation, supporting motor learning processes and potentially driving greater transfer to daily activities.
Clinically meaningful interpretation: the AHA improvements exceed the clinically meaningful threshold (≥5 AHA units), while MUUL improvements did not reach the 12-point threshold, suggesting stronger transfer to bimanual activities than to unilateral precision skills.
Implications for practice
The manualized 60-hour augmented P-CIMT camp is feasible and acceptable for school-age children with hCP and can be implemented in a camp setting with trained therapists and interventionists.
Incorporating 30 minutes of ArmeoVR training daily can increase overall intensity of practice and provide augmented feedback, potentially enhancing bimanual performance and occupational participation.
The program emphasizes motivation, group context, and enjoyable activities, which may enhance adherence and engagement compared with traditional CIMT alone.
Clinicians should consider using valid outcome measures that reflect activity and participation (AHA, COPM) rather than solely body-structure/function measures (MUUL) when evaluating CIMT interventions.
The ArmeoVR component should be tailored to individual ability, with ongoing adjustments to provide a just-right challenge to maximize repetition and learning.
Limitations and methodological considerations
Design limitations: single-group, non-randomized trial without a control group; limits causal inference.
Rater blinding: outcome assessors were not blinded to the intervention or timing, risking measurement bias; mitigated somewhat by using two independent raters for MUUL and standardized scoring for AHA.
Sample and generalizability: convenience sample from a single geographic location; results may not generalize to broader populations.
Follow-up: 6-month data available for 22 of 31 participants; attrition could influence long-term conclusions.
Comparability: heterogeneity across P-CIMT protocols in the literature; while the 60-hour, camp-based model is aligned with some prior work, differences in dosage and context can affect synthesis.
Future directions: randomized controlled trials comparing camp-based augmented P-CIMT (with ArmeoVR) vs P-CIMT alone or vs other rehabilitation paradigms; exploration of optimal ArmeoVR usage frequency/duration; assessment across diverse settings and populations; longer-term follow-up beyond 6 months.
Eligibility, consent, and governance details
Eligibility confirmed by investigators and annual review by research coordinators and principal investigators.
Informed consent obtained from guardians; assent from children aged 10–15.
Ethical approvals obtained across participating institutions.
Operational notes and resources
Camp manual and materials are available at the Texas Woman’s University Occupational Therapy site (Camp Manual in English and Spanish).
Interventionists received comprehensive training on CIMT and ArmeoVR use prior to the camp and ongoing supervision by experienced OTs.
The program uses a pirate-themed, motivation-friendly framework with a token economy to support engagement and adherence.
Key takeaways for practice and further study
Augmenting P-CIMT with a predictable, engaging VR-exoskeleton system is a promising approach to increase training intensity and improve functional outcomes in hCP.
Primary benefit observed was in bimanual performance and occupational performance (AHA and COPM), with noticeable but smaller gains in unilateral dexterity/quality of movement (MUUL).
The approach emphasizes fidelity to core CIMT components, structured shaping, meaningful task practice, group-based delivery, and transfer to daily activities.
Future work should employ randomized designs, include control groups, ensure blinded outcome assessment, and evaluate long-term maintenance and generalizability across diverse clinical settings.