I am using Marco Altini’s HRV4TRAINING. It demands forty days of data, once per day upon rising, before it will make recommendations. I also use Altini’s HRVLOGGER that acquires longer data acquisition periods. In the past I have acquired 24 hours of data, but currently an hour or two until I forget and walk out of range.
I am 73 y.o. and exercise vigorously. N. N. Taleb is excercise for the intellect.
N N Taleb's Probability Notebook 
Is this also related to entropy – the capacity for change ?
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I am using Marco Altini’s HRV4TRAINING. It demands forty days of data, once per day upon rising, before it will make recommendations. I also use Altini’s HRVLOGGER that acquires longer data acquisition periods. In the past I have acquired 24 hours of data, but currently an hour or two until I forget and walk out of range.
I am 73 y.o. and exercise vigorously. N. N. Taleb is excercise for the intellect.
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