Affiliations: Department of Neurology, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal
Correspondence to: Rui Araújo, Department of Neurology, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal. Tel.: +351 917 757 675; E-mail: [email protected].
Abstract: Tremor frequency analysis is usually performed by EMG studies but accelerometers are progressively being more used. The iPhone® contains an accelerometer and many applications claim to be capable of measuring tremor frequency. We tested three applications in twenty-two patients with a diagnosis of PD, ET and Holmes’ tremor. EMG needle assessment as well as accelerometry was performed at the same time. There was very strong correlation (Pearson >0.8, p < 0.001) between the three applications, the EMG needle and the accelerometry. Our data suggests the apps LiftPulse®, iSeismometer® and Studymytremor® are a reliable alternative to the EMG for tremor frequency assessment.