Tremor Frequency Assessment by iPhone® Applications: Correlation with EMG Analysis.
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.
Rui
R
Araújo
Miguel
M
Tábuas-Pereira
Luciano
L
Almendra
Joana
J
Ribeiro
Marta
M
Arenga
Luis
L
Negrão
Anabela
A
Matos
Ana
A
Morgadinho
Cristina
C
Januário
D061725:Accelerometry / Q000295:instrumentation / Q000592:standards*; D000368:Aged; D004576:Electromyography / Q000592:standards*; D020329:Essential Tremor / Q000175:diagnosis*; D006801:Humans; D008491:Medical Informatics Applications; D008875:Middle Aged; D018670:Monitoring, Ambulatory / Q000295:instrumentation / Q000592:standards*; D010300:Parkinson Disease / Q000150:complications / Q000175:diagnosis*; D015203:Reproducibility of Results; D000068997:Smartphone; D014202:Tremor / Q000175:diagnosis* / Q000209:etiology
EMG; Tremor; accelerometers; frequency; iPhone; smartphones