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Juerg Feldmann

Fortiori Design LLC
Posts: 1,530
ET had a great summary of his experience with HRV.
 I like to add some  small thoughts to it as I mentioned this in one of the add ons to his information.
 It fist  nicely ion our overall topic , that the physiological systems are all interlinked and  work seldom  on their own.
 This means , that  old ideas we all had , using HR as a guide for training intensity , or using wattage as a guide for intensity or  lactate  are great pieces of an overall puzzle. The  key is to have  some simple bio markers   and add their  individual information together for an overall picture.
  Same is true for HRV.
 Here a summary from a metaanalyses 

Is heart rate a convenient tool to monitor over-reaching? A systematic review of the literature.


Département de Kinésiologie, Université de Montréal, CP 6128, Succursale Centre Ville, Montreal, Quebec, Canada H3C 3J7.

Erratum in

  • Br J Sports Med. 2008 Dec;42(12):1016.



A meta-analysis was conducted on the effect of overload training on resting HR, submaximal and maximal exercise HR (HR), and heart rate variability (HRV), to determine whether these measures can be used as valid markers of over-reaching.


Six databases were searched using relevant terms and strategies. Criteria for study inclusion were: participants had to be competitive athletes, an increased training load intervention had to be used, and all necessary data to calculate effect sizes had to be available. An arbitrary limit of 2 weeks was chosen to make the distinction between short-term and long-term interventions. Dependent variables were HR and HRV (during supine rest). Standardised mean differences (SMD) in HR or HRV before and after interventions were calculated, and weighted according to the within-group heterogeneity to develop an overall effect.


In these competitive athletes, short-term interventions resulted in a moderate increase in both resting HR (SMD = 0.55; p = 0.01) and low frequency/high frequency ratio (SMD = 0.52; p = 0.02), and a moderate decrease in maximal HR (SMD = -0.75; p = 0.01). Long-term interventions resulted in a small decrease in HR during submaximal (SMD = -0.38; p = 0.006) and maximal exercise (SMD = -0.33; p = 0.007), without alteration of resting values.


The small to moderate amplitude of these alterations limits their clinical usefulness, as expected differences may fall within the day-to-day variability of these markers. Consequently, correct interpretation of HR or HRV fluctuations during the training process requires the comparison with other signs and symptoms of over-reaching to be meaningful.

And here a summary of the promissed information on  influence on HRV   from the respiratroy system

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