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[[File:HeartRateSimplified.svg|right|thumb|500px|A simplified chart of heart rate against exercise intensity showing [[Maximum Heart Rate]], [[Heart Rate Reserve]], [[Resting Heart Rate]], [[Orthostatic Heart Rate]], and [[Heart Rate Deflection]].]]
The Orthostatic Heart Rate Test is the difference between [[Resting Heart Rate]] taken when lying down and [[Heart Rate]] when standing (the [[Orthostatic Heart Rate]].) The test measures how the heart responds to the added stress of standing up, which requires the heart to pump against gravity. The Orthostatic 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 Rate]] such as exercise, stress or [[Caffeine]] before the test.
* Taking the [[Heart Rate]] reading should be done in such a way that it requires no effort on the part of the subject. A [[Heart Rate Monitor]] is ideal, and a [[Pulse Oximeter]] works well.
* The [[Resting Heart Rate]] 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"/>. 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 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 is more than a 30 BPM rise, or the standing Heart Rate is greater than 120 BPM<ref name="Pots"/>. People with POTS have problems with lightheadedness or fainting when standing up.
=Polar OwnOptimizer=
Some Polar [[Heart Rate Monitors]] include a version of the Orthostatic Heart Rate called OwnOptimizer<ref name="PolarOwn"/>. This test uses other [[Heart Rate]] parameters, such as [[Heart Rate Variability]] to indicate [[Overtraining Syndrome]]. 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>
The Orthostatic Heart Rate Test is the difference between [[Resting Heart Rate]] taken when lying down and [[Heart Rate]] when standing (the [[Orthostatic Heart Rate]].) The test measures how the heart responds to the added stress of standing up, which requires the heart to pump against gravity. The Orthostatic 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 Rate]] such as exercise, stress or [[Caffeine]] before the test.
* Taking the [[Heart Rate]] reading should be done in such a way that it requires no effort on the part of the subject. A [[Heart Rate Monitor]] is ideal, and a [[Pulse Oximeter]] works well.
* The [[Resting Heart Rate]] 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"/>. 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 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 is more than a 30 BPM rise, or the standing Heart Rate is greater than 120 BPM<ref name="Pots"/>. People with POTS have problems with lightheadedness or fainting when standing up.
=Polar OwnOptimizer=
Some Polar [[Heart Rate Monitors]] include a version of the Orthostatic Heart Rate called OwnOptimizer<ref name="PolarOwn"/>. This test uses other [[Heart Rate]] parameters, such as [[Heart Rate Variability]] to indicate [[Overtraining Syndrome]]. 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>