For Doctors in a Hurry
- Researchers investigated whether spreading out intensive motor therapy sessions improves feasibility for families of children with bilateral cerebral palsy.
- This randomized study compared massed versus distributed dosing of a 90-hour intensive therapy program in 21 children with cerebral palsy.
- Both groups achieved statistically significant improvements in dexterity, gross motor function, and trunk control with p-values less than 0.05.
- The researchers concluded that a distributed dosing schedule yields functional motor gains equivalent to those achieved through traditional massed therapy.
- Clinicians can offer flexible scheduling options to accommodate family routines without compromising the effectiveness of intensive motor learning interventions.
Redefining Intensity in Bilateral Cerebral Palsy Rehabilitation
Managing bilateral cerebral palsy requires addressing concurrent deficits in upper limb dexterity and gross motor function to improve functional independence [1, 2]. Integrated interventions such as Hand-Arm Bimanual Intensive Therapy Including the Lower Extremities (HABIT-ILE) utilize motor skill learning, a process of improving the smoothness and accuracy of movements through repetitive practice, to coordinate all four limbs simultaneously [3, 4]. In a multisite randomized controlled trial of 90 children with bilateral cerebral palsy, 65 hours of HABIT-ILE delivered over two weeks resulted in superior gains in manual ability (mean difference 0.85; 95% CI 0.38 to 1.33; p < 0.001) and mobility, although gross motor function did not show statistically significant changes in that specific cohort [5]. However, a separate trial involving 84 hours of training over 13 days demonstrated significant improvements in both the Gross Motor Function Measure-66 and walking endurance as measured by the 6-Minute Walk Test [4]. While evidence-based guidelines categorize these intensive, goal-directed protocols as highly effective, the logistical demands of high-dose, camp-based models often limit clinical implementation [6, 7, 8]. To address this barrier, researchers are now evaluating whether modified delivery schedules can maintain these functional gains while reducing the practical burden on families and healthcare systems.
Comparing Massed and Distributed 90-Hour Protocols
To evaluate the impact of treatment timing on functional outcomes, researchers enrolled a cohort of 21 children with bilateral cerebral palsy, aged 5 to 17 years, in a randomized clinical trial (NCT03940989). The participants were assigned to one of two distinct delivery models for Hand-Arm Bimanual Intensive Therapy Including the Lower Extremities (HABIT-ILE), an intervention that focuses on motor learning by requiring the child to use both hands and their legs simultaneously during functional tasks. Regardless of the assigned group, every participant received a total treatment dose of 90 hours, ensuring that the overall volume of therapy remained constant while the frequency and duration of the sessions varied.
The researchers compared a traditional high-intensity block, known as a massed dosing schedule, against a more spread-out approach called a distributed dosing schedule. In the massed group, children underwent 6 hours of therapy per day, 5 days per week, for a total of 3 weeks. This intensive model is frequently utilized in research settings but can be prohibitively difficult for families to manage due to the daily time commitment required. In contrast, the distributed dosing schedule provided 6 hours of therapy per day, 1 day per week, extending the program over 15 weeks. By maintaining the 90-hour total dose across both arms, the study aimed to determine if the physiological and functional benefits of intensive therapy could be preserved when the sessions are integrated into a weekly routine rather than concentrated into a single month.
Equivalent Functional Gains Across Motor Domains
To evaluate the efficacy of the two dosing schedules, the researchers utilized three primary outcome measures targeting distinct areas of motor performance. Upper extremity dexterity, the ability to manipulate small objects quickly and accurately, was assessed using the Box and Blocks Test. Gross motor function, the coordination of large muscle groups for movements such as walking or jumping, was quantified through the Gross Motor Function Measure-66. Additionally, the researchers evaluated trunk control, the ability to maintain an upright posture and stabilize the torso during limb movement, using the Trunk Control Measurement Scale. These metrics provided a comprehensive view of how the 90-hour HABIT-ILE intervention influenced the children's overall physical capabilities.
The study results demonstrated that both the massed and distributed dosing schedules led to significant gains in upper extremity function (P < .05) and lower extremity function (P < .05). Furthermore, participants in both groups achieved significant improvements in balance (P < .05) and trunk control (P < .05). When comparing the two delivery models, the researchers found that there was no statistical advantage of one dosing schedule over the other across any of the primary measures. This indicates that the therapeutic benefit of the intensive intervention is preserved even when the sessions are spread out over 15 weeks rather than concentrated into three weeks.
Clinical relevance is further supported by the long-term stability of these improvements. The data showed that the distributed model produced similar retention of functional motor skills and activity compared to the massed model, suggesting that the slower pace of the 15-week schedule does not lead to a loss of acquired skills between sessions. For practicing physicians and physical therapists, these findings suggest that the total therapeutic dose of 90 hours is the critical factor for success in bilateral cerebral palsy rehabilitation, rather than the speed at which that dose is administered. This allows clinicians to offer greater flexibility in scheduling intensive therapy, accommodating family routines and reducing caregiver burden without sacrificing clinical efficacy.
References
1. Plasschaert VFP, Vriezekolk JE, Aarts P, Geurts ACH, Ende CVD. Interventions to improve upper limb function for children with bilateral cerebral palsy: a systematic review. Developmental Medicine & Child Neurology. 2019. doi:10.1111/dmcn.14141
2. Sakzewski L, Reedman S, McLeod K, et al. Preschool HABIT-ILE: study protocol for a randomised controlled trial to determine efficacy of intensive rehabilitation compared with usual care to improve motor skills of children, aged 2–5 years, with bilateral cerebral palsy. BMJ Open. 2021. doi:10.1136/bmjopen-2020-041542
3. Araneda R, Sizonenko S, Newman CJ, et al. Protocol of changes induced by early Hand-Arm Bimanual Intensive Therapy Including Lower Extremities (e-HABIT-ILE) in pre-school children with bilateral cerebral palsy: a multisite randomized controlled trial. BMC Neurology. 2020. doi:10.1186/s12883-020-01820-2
4. Bleyenheuft Y, Ebner‐Karestinos D, Surana B, et al. Intensive upper‐ and lower‐extremity training for children with bilateral cerebral palsy: a quasi‐randomized trial. Developmental Medicine & Child Neurology. 2017. doi:10.1111/dmcn.13379
5. Sakzewski L, Bleyenheuft Y, Novak I, et al. A Multisite Randomized Controlled Trial of Hand Arm Bimanual Intensive Training Including Lower Extremity for Children with Bilateral Cerebral Palsy. The Journal of Pediatrics. 2025. doi:10.1016/j.jpeds.2025.114666
6. Novak I, Morgan C, Fahey M, et al. State of the Evidence Traffic Lights 2019: Systematic Review of Interventions for Preventing and Treating Children with Cerebral Palsy. Current Neurology and Neuroscience Reports. 2020. doi:10.1007/s11910-020-1022-z
7. group EH, Araneda R, Sizonenko S, et al. Functional, neuroplastic and biomechanical changes induced by early Hand-Arm Bimanual Intensive Therapy Including Lower Extremities (e-HABIT-ILE) in pre-school children with unilateral cerebral palsy: study protocol of a randomized control trial. BMC Neurology. 2020. doi:10.1186/s12883-020-01705-4
8. Faccioli S, Pagliano E, Ferrari A, et al. Evidence-based management and motor rehabilitation of cerebral palsy children and adolescents: a systematic review. Frontiers in Neurology. 2023. doi:10.3389/fneur.2023.1171224
