Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Comparison of a 2D iPad application and 3D body scanner to air displacement plethysmography for measurement of body fat percentage.

Journal of human nutrition and dietetics : the official journal of the British Dietetic Association·2019
Same author

The effects of bolt length on penetration hole characteristics, brain damage and specified-risk material dispersal in finished cattle stunned with a penetrating captive bolt stunner.

Meat science·2019
Same author

Adenosine A1 receptor activation attenuates cardiac hypertrophy and fibrosis in response to α1 -adrenoceptor stimulation in vivo.

British journal of pharmacology·2015
Same author

The role of calcium signalling in the chondrogenic response of mesenchymal stem cells to hydrostatic pressure.

European cells & materials·2014
Same author

Role of MicroRNAs in Endothelial Progenitor Cells: Implication for Cardiac Repair.

Journal of stem cells·2014
Same author

[Percutaneous aortic valve replacement using the Direct Flow Medical system: results of the Luxembourg registry].

Bulletin de la Societe des sciences medicales du Grand-Duche de Luxembourg·2014

Related Experiment Video

Updated: Jul 28, 2026

Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity
05:59

Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity

Published on: March 7, 2019

Direct comparison of two widely used activity recorders

C P Pollak1, P E Stokes, D R Wagner

  • 1Department of Neurology, Ohio State University, Columbus 43210, USA.

Sleep
|July 4, 1998
PubMed
Summary

Wrist actigraphy devices reliably track sleep-wake cycles, but the Gaehwiler (G) model shows insensitivity to nocturnal movements compared to the MotionLogger (AM). This highlights the need for standardized actigraphy device comparisons.

Area of Science:

  • Biomedical Engineering
  • Sleep Science
  • Chronobiology

Background:

  • Wrist actigraphy is widely used for monitoring circadian rest-activity patterns and sleep-wake states.
  • Comparative studies on the measurement characteristics of different actigraphy devices are lacking.

Purpose of the Study:

  • To compare the measurement characteristics of two leading wrist actigraphy devices: the MotionLogger (AM) and the Gaehwiler (G).
  • To assess the reliability and validity of both devices in detecting circadian rhythms and distinguishing sleep/wake states.

Main Methods:

  • Five research team members simultaneously wore both AM and G actigraphy recorders on the same wrist for an average of 41.5 hours.
  • Activity counts were recorded every half-minute for pairwise comparison.

More Related Videos

Assessing the Accuracy of Fitness Smartwatch Data for Cardiovascular and Physical Activity Monitoring: A Validation Study in Digital Health
05:51

Assessing the Accuracy of Fitness Smartwatch Data for Cardiovascular and Physical Activity Monitoring: A Validation Study in Digital Health

Published on: February 21, 2025

Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption
08:45

Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption

Published on: June 20, 2025

Related Experiment Videos

Last Updated: Jul 28, 2026

Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity
05:59

Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity

Published on: March 7, 2019

Assessing the Accuracy of Fitness Smartwatch Data for Cardiovascular and Physical Activity Monitoring: A Validation Study in Digital Health
05:51

Assessing the Accuracy of Fitness Smartwatch Data for Cardiovascular and Physical Activity Monitoring: A Validation Study in Digital Health

Published on: February 21, 2025

Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption
08:45

Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption

Published on: June 20, 2025

Main Results:

  • Both AM and G devices demonstrated reliability and validly detected circadian rest-activity cycles.
  • The G device exhibited insensitivity to lower activity levels (over 95% of nocturnal data), suggesting reduced sensitivity to nocturnal movements and arousals compared to the AM.
  • AM data showed biphasic distribution, consistent with distinct activity/wakefulness and rest/sleep states, unlike G data.

Conclusions:

  • Significant differences exist between the AM and G actigraphy devices, particularly in sensitivity to nocturnal movements and data distribution.
  • The findings underscore an urgent need for standardized methods to compare actigraphy recorders, focusing on reliability, validity, ruggedness, and artifact rejection.