RESUMO
BACKGROUND: Based on the premise that spasticity might affect gait post-stroke, cryotherapy is among the techniques used to temporarily reduce spasticity in neurological patients. This effective technique would enhance muscle performance, and ultimately, functional training, such as walking. However, understanding whether a decrease in spasticity level, if any, would lead to improving muscle performance and gait parameters is not based on evidence and needs to be clarified. OBJECTIVES: to investigate the immediate effects of cryotherapy, applied to spastic plantarflexor muscles of subjects post-stroke, on tonus level, torque generation capacity of plantarflexors and dorsiflexors, and angular/spatiotemporal gait parameters. METHODS: Sixteen chronic hemiparetic subjects participated in this randomized controlled crossover study. Cryotherapy (ice pack) or Control (room temperature sand pack) were applied to the calf muscles of the paretic limb. The measurements taken (before and immediately after intervention) were: 1) Tonus according to the Modified Ashworth Scale; 2) Torque assessments were performed using an isokinetic dynamometer; and 3) Spatiotemporal and angular kinematics of the hip, knee, and ankle (flexion/extension), obtained using a tridimensional movement analysis system (Qualisys). RESULTS: Cryotherapy decreased plantarflexor tonus but did not change muscle torque generation capacity and did not affect spatiotemporal or angular parameters during gait compared to control application. These findings contribute to the evidence-based approach to clinical rehabilitation post-stroke. CONCLUSIONS: The findings of this study suggest that cryotherapy applied to the calf muscles of subjects with chronic hemiparesis reduces muscle hypertonia but does not improve dorsiflexors and plantarflexors performance and gait parameters.
Assuntos
Crioterapia , Marcha/fisiologia , Espasticidade Muscular/terapia , Força Muscular/fisiologia , Músculo Esquelético/fisiopatologia , Acidente Vascular Cerebral/fisiopatologia , Idoso , Articulação do Tornozelo/fisiopatologia , Fenômenos Biomecânicos , Estudos Cross-Over , Feminino , Humanos , Articulação do Joelho/fisiopatologia , Extremidade Inferior/fisiopatologia , Masculino , Pessoa de Meia-Idade , Espasticidade Muscular/etiologia , Espasticidade Muscular/fisiopatologia , Paresia/complicações , Paresia/fisiopatologia , Paresia/reabilitação , Amplitude de Movimento Articular , Método Simples-Cego , Acidente Vascular Cerebral/complicações , Reabilitação do Acidente Vascular Cerebral/métodosRESUMO
OBJECTIVE: The aim of the study was to evaluate the immediate effects of cryotherapy (using an ice pack) on ankle joint position sense and the degree of spasticity after chronic hemiparetic stroke. DESIGN: We used a sham-controlled crossover design. Sixteen chronic hemiparetic patients were randomly assigned to two groups: (1) those who received cryotherapy followed by a control intervention 15 days later (cryotherapy group) and (2) those who received the control intervention followed by cryotherapy 15 days later (control intervention group). Ankle joint position sense was measured on the paretic side using a Biodex Multi-joint System 3 dynamometer before and after 20 mins of either application on the calf muscles. Lower absolute error scores were calculated for data analyses and were used to determine joint position sense. The degree of spasticity of the plantar flexor muscles was scored according to the Modified Ashworth Scale. RESULTS: Sixteen patients completed the crossover experiment; however, data analysis was successfully conducted in 15 participants. Cryotherapy reduced the degree of spasticity of the plantar flexor muscles without altering ankle joint position sense. CONCLUSIONS: Cryotherapy (using an ice pack) may reduce plantar flexor spasticity without influencing proprioception.