Fitbit, una app para medir la actividad física diaria / Fitbit app: tracking all day physical activity

Fitbit es conocida básicamente por su capacidad de seguimiento de actividades, y la App es una herramienta adicional para ello. La App puede contar los pasos, las calorías quemadas, y junto con otros productos Fitbit puede incluso grabar otras informaciones útiles como la presión sanguínea, los niveles de glucosa o los patrones de sueño. El objetivo del artículo de opinión es realizar una revisión de Fitbit, una app de la categoría de deportes y salud, que puede tener aplicaciones clínicas importantes(AU)

Fitbit is basically known for its ability to track activities, and the App is an additional tool for this. The App can count the steps, the calories burned, and along with other products Fitbit can even record other useful information such as blood pressure, glucose levels or sleep patterns. The objective of the opinion article is to carry out a review of Fitbit, an app in the sports and health category, which may have important clinical applications(AU)

Comparison of a Commercial Accelerometer with Polysomnography and Actigraphy in Children and Adolescents.

STUDY OBJECTIVES: To evaluate the reliability and validity of the commercially available Fitbit Ultra (2012) accelerometer compared to polysomnography (PSG) and two different actigraphs in a pediatric sample. DESIGN AND SETTING: All subjects wore the Fitbit Ultra while undergoing overnight clinical polysomnography in a sleep laboratory; a randomly selected subset of participants also wore either the Ambulatory Monitoring Inc. Motionlogger Sleep Watch (AMI) or Phillips-Respironics Mini-Mitter Spectrum (PRMM). PARTICIPANTS: 63 youth (32 females, 31 males), ages 3-17 years (mean 9.7 years, SD 4.6 years). MEASUREMENTS: Both "Normal" and "Sensitive" sleep-recording Fitbit Ultra modes were examined. Outcome variables included total sleep time (TST), wake after sleep onset (WASO), and sleep efficiency (SE). Primary analyses examined the differences between Fitbit Ultra and PSG using repeated-measures ANCOVA, with epoch-by-epoch comparisons between Fitbit Ultra and PSG used to determine sensitivity, specificity, and accuracy. Intra-device reliability, differences between Fitbit Ultra and actigraphy, and differences by both developmental age group and sleep disordered breathing (SDB) status were also examined. RESULTS: Compared to PSG, the Normal Fitbit Ultra mode demonstrated good sensitivity (0.86) and accuracy (0.84), but poor specificity (0.52); conversely, the Sensitive Fitbit Ultra mode demonstrated adequate specificity (0.79), but inadequate sensitivity (0.70) and accuracy (0.71). Compared to PSG, the Fitbit Ultra significantly overestimated TST (41 min) and SE (8%) in Normal mode, and underestimated TST (105 min) and SE (21%) in Sensitive mode. Similar differences were found between Fitbit Ultra (both modes) and both brands of actigraphs. CONCLUSIONS: Despite its low cost and ease of use for consumers, neither sleep-recording mode of the Fitbit Ultra accelerometer provided clinically comparable results to PSG. Further, pediatric sleep researchers and clinicians should be cautious about substituting these devices for validated actigraphs, with a significant risk of either overestimating or underestimating outcome data including total sleep time and sleep efficiency.