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 Experiment Videos

No basic rest-activity cycle in head, wrist or ankle.

N Okudaira, D F Kripke, J B Webster

    Physiology & Behavior
    |May 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    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

    The Effect of Sublethal Heat Shock and Growth Atmosphere on the Heat Resistance of Listeria monocytogenes Scott A.

    Journal of food protection·2019
    Same author

    Analysis.

    Journal of religion and health·2014
    Same author

    Long interspersed element-1 is differentially regulated by food-borne carcinogens via the aryl hydrocarbon receptor.

    Oncogene·2012
    Same author

    Utilization of a lower extremity ambulatory feedback system to reduce gait asymmetry in transtibial amputation gait.

    Gait & posture·2012
    Same author

    Functional genetic variation in the Rev-Erbα pathway and lithium response in the treatment of bipolar disorder.

    Genes, brain, and behavior·2011
    Same author

    Prediction of fluoroquinolone-induced elevation in serum creatinine levels: a case of drug-endogenous substance interaction involving the inhibition of renal secretion.

    Clinical pharmacology and therapeutics·2010
    Same journal

    Apelin receptor antagonist (ML221) facilitates memory reconsolidation in novel object recognition task.

    Physiology & behavior·2026
    Same journal

    Are humans adapted to the world they have developed?

    Physiology & behavior·2026
    Same journal

    50-kHz ultrasonic vocalization subtypes emitted by female rats anticipating same-sex social interaction.

    Physiology & behavior·2026
    Same journal

    Sex-dependent behavioral and prefrontal BDNF mRNA responses to extinction training and short-term citalopram after fear conditioning in rats.

    Physiology & behavior·2026
    Same journal

    Social instability alters the topography of adolescent and adult social behavior and amygdala function.

    Physiology & behavior·2026
    Same journal

    Mitochondrial remodeling in obesity: mechanistic links to impaired energy metabolism and therapeutic perspectives.

    Physiology & behavior·2026
    See all related articles

    Researchers investigated Kleitman's Basic Rest-Activity Cycle (BRAC) theory by monitoring body movements in 10 individuals. The study found no evidence supporting the predicted 90-100 minute cycles in physical activity.

    Area of Science:

    • Sleep Science
    • Chronobiology
    • Human Physiology

    Background:

    • The Basic Rest-Activity Cycle (BRAC) theory proposes ultradian rhythms in human physiological and behavioral functions.
    • Proposed by Nathaniel Kleitman, BRAC suggests cycles of approximately 90-100 minutes influence rest and activity patterns.
    • Understanding these cycles is crucial for fields like sleep medicine and performance optimization.

    Purpose of the Study:

    • To empirically test Kleitman's Basic Rest-Activity Cycle (BRAC) theory.
    • To determine if measurable physical activity rhythms align with the proposed 90-100 minute cycle.
    • To investigate the presence of ultradian rhythms in healthy adults.

    Main Methods:

    • Activity levels were objectively measured in 10 healthy human subjects.

    Related Experiment Videos

  • Movement was recorded from the head, wrists, and left ankle.
  • Data analysis focused on identifying cyclical patterns within the 90-100 minute range.

    • Main Results:

    • No statistically significant 90-100 minute rhythms in physical activity were detected.
    • Recorded activity patterns did not conform to Kleitman's BRAC theory predictions.
    • Individual variations in activity were observed, but not consistent ultradian cycles.

    Conclusions:

    • The findings do not support the existence of a Basic Rest-Activity Cycle (BRAC) as described by Kleitman in terms of physical activity.
    • Further research may be needed to explore potential BRAC manifestations in other physiological parameters or different populations.
    • This study suggests that readily measurable physical activity may not be a reliable indicator of ultradian rhythms.