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Open AccessJournal ArticleDOI

Validity of the ithlete™ Smart Phone Application for Determining Ultra-Short-Term Heart Rate Variability.

Andrew A. Flatt, +1 more
- 01 Dec 2013 - 
- Vol. 39, Iss: 1, pp 85-92
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TLDR
The ithleteTM appeared to provide a suitably accurate measure of root mean square of successive R-R intervals when compared to the electrocardiograph measures obtained in the laboratory within the current sample of healthy adult participants.
Abstract
The purpose of this investigation was to cross-validate the ithleteTM heart rate variability smart phone application with an electrocardiograph for determining ultra-short-term root mean square of successive R-R intervals. The root mean square of successive R-R intervals was simultaneously determined via electrocardiograph and ithleteTM at rest in twenty five healthy participants. There were no significant differences between the electrocardiograph and ithlete TM derived root mean square of successive R-R interval values (p > 0.05) and the correlation was near perfect (r = 0.99, p < 0.001). In addition, the ithlete TM revealed a Standard Error of the Estimate of 1.47 and Bland Altman plot showed that the limits of agreement ranged from 2.57 below to 2.63 above the constant error of -0.03. In conclusion, the ithleteTM appeared to provide a suitably accurate measure of root mean square of successive R-R intervals when compared to the electrocardiograph measures obtained in the laboratory within the current sample of healthy adult participants. The current study lays groundwork for future research determining the efficacy of ithlete TM for reflecting athletic training

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Heart Rate Variability and Cardiac Vagal Tone in Psychophysiological Research - Recommendations for Experiment Planning, Data Analysis, and Data Reporting.

TL;DR: This paper will provide psychophysiological researchers with recommendations and practical advice concerning experimental designs, data analysis, and data reporting to ensure that researchers starting a project with HRV and cardiac vagal tone are well informed regarding methodological considerations in order for their findings to contribute to knowledge advancement in their field.
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Monitoring training status with HR measures: do all roads lead to Rome?

TL;DR: This review contends that most of the contradictory findings are related to methodological inconsistencies and/or misinterpretation of the data rather than to limitations of heart rate measures to accurately inform on training status, and provides evidence that measures derived from 5-min recordings of resting and submaximal exercise heart rate are likely the most useful monitoring tools.
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Ultra-Short-Term Heart Rate Variability Indexes at Rest and Post-Exercise in Athletes: Evaluating the Agreement with Accepted Recommendations

TL;DR: 60 seconds appears to be an acceptable recording time for lnRMSSD data collection in collegiate athletes, and the utility of ultra-sound-term ln RMSSD measures, especially 60 seconds in duration, within field setting for monitoring athletes at rest and in response to stress appears promising.
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Can Wearable Devices Accurately Measure Heart Rate Variability? A Systematic Review.

TL;DR: Wearable devices may provide a promising alternative solution for measuring RV, however, more robust studies in non-stationary conditions are needed using appropriate methodology in terms of number of subjects involved, acquisition and analysis techniques implied.
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Vagal Tank Theory: The Three Rs of Cardiac Vagal Control Functioning - Resting, Reactivity, and Recovery.

TL;DR: The vagal tank theory, building on neurophysiological, cognitive and social psychology approaches, will introduce a physiological indicator for self-regulation that has mainly been ignored from cognitive andSocial psychology, cardiac vagal control.
References
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TL;DR: An alternative approach, based on graphical techniques and simple calculations, is described, together with the relation between this analysis and the assessment of repeatability.
Journal ArticleDOI

Statistical methods for assessing agreement between two methods of clinical measurement

TL;DR: In this article, an alternative approach, based on graphical techniques and simple calculations, is described, together with the relation between this analysis and the assessment of repeatability, which is often used in clinical comparison of a new measurement technique with an established one.
Journal ArticleDOI

Validity of the polar S810 heart rate monitor to measure R-R intervals at rest.

TL;DR: Narrow LoA, good correlations, and small effect sizes support the validity of the Polar S810 HRM to measure R-R intervals and make the subsequent HRV analysis in supine position.
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