Potentiation of muscle strength by focal vibratory stimulation on quadriceps femoris.

OBJECTIVES: Several studies have investigated the effects of focal vibration on muscle strength. Non-univocal results have been found. The aim of this study was to evaluate the effect of prolonged focal vibratory stimulation on quadriceps muscle strength at two different frequencies (80 and 300 Hz). The evaluation of muscle strength was performed at different intervals of time after the end of the vibratory stimulation in order to quantify the long-term effects and their trends over time. METHODS: Twenty-seven healthy volunteers were divided into three groups, a control group (no treatment) and two groups treated with vibratory stimulation (80 or 300 Hz) of relaxed quadriceps femoris bilaterally, once a day (30 min) for 5 consecutive days. The quadriceps' strength was measured through an isokinetic dynamometer, before and at three time intervals after the treatment, with a follow-up period of 4 weeks. The outcome measure was the Peak Torque (PT, Nm) of the quadriceps femoris produced by extension movement at three defined angular velocities and during isometric contraction. RESULTS: No changes in PT were observed in the control group over time, while PT increased in the treated groups. No significant difference in PT behavior was observed between these two groups. PTs recorded before and after the treatment were markedly different, and the increase in the PT persisted until the follow-up at 4 weeks, for all angular velocities tested. CONCLUSIONS: Prolonged vibratory stimulation of the quadriceps femoris, both at 80 and at 300 Hz, leads to an increase in muscle strength. The vibration effect does not appear to fade at the end of treatment, but persists at the follow up, suggesting a likely underlying plastic process. The results of the current study suggest that 30-min per day, 5 day focal vibratory treatment can be helpful during the clinical practice to regain muscular strength. It does not require patient's effort during the treatment, requires a little time, its effects are long-lasting, and there are no known adverse effects.

Postoperative rehabilitation for chronic subdural hematoma in the elderly. An observational study focusing on balance, ambulation and discharge destination.

BACKGROUND: Chronic subdural hematoma (CSDH) can have a negative impact on autonomy of the elderly. Ambulatory and functional status may remain limited despite successful surgical evacuation. AIM: To evaluate the outcome of a postoperative assisted rehabilitation program. DESIGN: Single-institution short-term observational study. SETTING: Inpatient (Neurosurgery Unit of a University Hospital). POPULATION: Thirty-five patients, aged 65 or older, who underwent burr-hole drainage for chronic subdural hematoma. METHODS: Postoperatively all participants underwent a rehabilitation program, described in details, aimed at recovering standing position and gait as soon as possible. The program involved daily 30-minute individual sessions assisted by a physiotherapist, until discharge from hospital. The Markwalder's Grading Scale was used to assess the neurological status preoperatively and at discharge. The Trunk Control Test, the Standing Balance by Bohannon Scale and the Modified Rankin Scale were used to evaluate balance and general function (primary outcome) in the immediate postoperative and at discharge. We also recorded the rate of pre-CSDH walking patients who maintained ambulation at discharge and the discharge destination (secondary outcome). RESULTS: Total scores of Markwalder's Grading Scale, Trunk Control Test, Standing Balance by Bohannon Scale and Modified Rankin Scale improved (P<0.05), indicating a global favorable outcome, especially for balance. Excluding the patients who were dependent pre-CSDH, the others maintained gait function in 74.2% of cases. Only 45.7% of the patients were discharged home, the others being divided between inpatient medical settings and rehabilitation. CONCLUSIONS: The rehabilitation program was well tolerated by the patients. Our study showed a clear improvement in trunk control and standing balance and an overall favorable outcome for neurological and ambulatory status at discharge. Despite an assisted postoperative rehabilitation program, the residual impairment in general function was the main factor that prevents us to discharge more elderly patients home rather than to assisted settings. CLINICAL REHABILITATION IMPACT: The results of this descriptive study suggest that an assisted rehabilitation program may be helpful in improving short-term postoperative balance and ambulatory status (more than functional status), but further studies, with a randomized controlled design, are certainly justified to understand the efficacy of rehabilitation in this context.