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Orthostatic Heart Rate is the difference between [[Resting Heart Rate]] taken when lying down and [[Heart Rate]] when standingFile:HeartRateSimplified. The test measures how the heart responds to the added stress svg|right|thumb|500px|A simplified chart of standing up, which requires the heart to pump rate against gravity. The Orthostatic Heart Rate is sometimes considered a exercise intensity showing [[Overtraining Syndrome Symptoms|Symptom of Overtraining Syndrome]]. =Performing the Orthostatic Maximum Heart Rate Test=There are wide variations<ref name="OhInconst"/> in the details of how to perform this test, so the following is based on a research study that compared different approaches to determine the optimal solution<ref name="OhComp"/>. * For monitoring [[Overtraining Syndrome]], the test should be performed in the same way and under the same conditions each day. * This test is normally performed on waking in the morning. If performed at other times, avoid things that change [[Heart RateReserve]] such as exercise, stress or [[Caffeine]] before the test. * Taking the [[Resting Heart Rate]] reading should be done in such a way that it requires no effort on the part of the subject. A , [[Orthostatic Heart Rate Monitor]] is ideal, and a [[Pulse Oximeter]] works well. * The [[Resting Heart RateDeflection]] should be taken after lying down for at least 5 minutes, preferably 10 minutes<ref name="OhComp"/>. Lying down for longer is not required, but it is also not a problem.* Stand up gently and remain still for 2 minutes before taking a second [[Heart Rate]] reading<ref name="OhComp"/>. * The difference between the two readings is the Orthostatic Heart Rate. =What does the Orthostatic Heart Rate Test detect?=A high Orthostatic Heart Rate has been suggested as a symptom of [[Overtraining Syndrome]], but it can also be caused by a viral infection, diabetes mellitus, as well as autoimmune and neurodegenerative disorders <ref name="OhRef"/>heart rate when standing. There seems to be little evidence to support the Orthostatic Heart Rate Test as a reliable method of predicting or detecting This [[Overtraining Syndrome]]. However, this test is generally easy to perform and may be useful when considered as one possible indicator that can be factored in. =What does the number mean?=An Orthostatic Heart Rate rise of 30 BPM or more is a sign of Postural Orthostatic Tachycardia Syndrome (see below) and would indicate that a medical evaluation is appropriate. For detecting [[Overtraining Syndrome]] it is an increase in the size of the rise, based on an established baseline. That makes it tough to use this test for suspected slightly above [[Overtraining SyndromeResting Heart Rate]] unless there as resting HR is a history of measurement that can be used for comparisontaken either lying down or seated. It has been suggested that an A difference between Resting Heart Rate and Orthostatic Heart Rate rise of is normally 10-15 BPM is considered 'normal', and an increase of 5 BPM over baseline is indicative of [[Overtraining Syndrome]]. =Postural Orthostatic Tachycardia Syndrome=Postural Orthostatic Tachycardia Syndrome (POTS) is the Orthostatic Heart Rate I believe this is a more useful value than a 30 BPM rise, or resting heart rate as it reflects the standing Heart Rate is greater than 120 BPM<ref name=a "Potszero power"/>. People with POTS have problems with lightheadedness or fainting when standing up. =Polar OwnOptimizer=Some Polar [[The Orthostatic Heart Rate Monitors]] include a version is part of the Orthostatic Heart Rate called OwnOptimizer<ref name="PolarOwn"/>. This test uses other [[Orthostatic Heart Rate]] parameters, such as [[Heart Rate Variability]] to indicate [[Overtraining SyndromeTest]]. There is some limited scientific evidence that the Polar test can detect intense training<ref name="PolarOTScience"/>, but there is no evidence that is predicts or detects [[Overtraining Syndrome]]. =References=<references><ref name="PolarOTScience"> http://www.polar.fi/en/about_polar/who_we_are/research/overtraining_test </ref> <ref name="Pots">Postural Tachycardia Syndrome Information Page: National Institute of Neurological Disorders and Stroke (NINDS) http://www.ninds.nih.gov/disorders/postural_tachycardia_syndrome/postural_tachycardia_syndrome.htm </ref><ref name="OhInconst">Medscape Log In http://www.medscape.com/viewarticle/474822_2 </ref><ref name="OhComp">Comparison of different methods of obtaining o... [Clin Nurs Res. 2000] - PubMed - NCBI http://www.ncbi.nlm.nih.gov/pubmed/11881701 </ref><ref name="OhRef">Orthostatic heart rate and blood pressure in ... [J Child Neurol. 2010] - PubMed - NCBI http://www.ncbi.nlm.nih.gov/pubmed/20197269 </ref><ref name="PolarOwn"> http://www.polarusa.com/us-en/support/OwnOptimizer?product_id=7881&category=tips </ref></references>
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