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Orthostatic [[Heart Rate]] is the difference between File:HeartRateSimplified.svg|right|thumb|500px|A simplified chart of heart rate against exercise intensity showing [[Resting Maximum Heart Rate]] taken when lying down and , [[Heart RateReserve]] when standing. The test measures how the heart responds to the added stress of standing up, which requires the heart to pump against gravity. The Orthostatic [[Resting Heart Rate]] is sometimes considered a , [[Overtraining Syndrome Symptoms|Symptom of Overtraining Syndrome]].  =Performing the Orthostatic 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 RateDeflection]] such as exercise, stress or [[Caffeine.]] before the test. * Taking the [[The Orthostatic Heart Rate]] reading should be done in such a way that it requires no effort on the part of the subjectheart rate when standing. A This [[Heart Rate Monitor]] is ideal, and a [[Pulse Oximeter]] works well. * The slightly above [[Resting Heart Rate]] should be as resting HR is taken after either lying down for at least 5 minutes, preferably 10 minutes<ref name="OhComp"/>or seated. 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 A difference between the two readings is the Orthostatic [[Heart Rate]].  =What does the Orthostatic Heart Rate Test detect?=A high Orthostatic [[Resting 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"/>. There seems to be little evidence to support the Orthostatic [[Heart Rate]] Test as a reliable method of predicting or detecting [[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 [[Overtraining Syndrome]] unless there is a history of measurement that can be used for comparison. It has been suggested that an Orthostatic [[Heart Rate]] rise of 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 Monitor]]s include a version is part of the Orthostatic [[Orthostatic Heart Rate]] called OwnOptimizer<ref name="PolarOwn"/>. This test uses other [[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>