What heart rate should I train in at age 40?

Between 117 bpm and 154 bpm for most sessions. HRmax is 220 minus 40, which is 180 bpm, and 65% and 85% of 180 bpm are 117 bpm and 154 bpm.

Is 45 bpm while I sleep a problem?

No, sleeping heart rates around 40 to 50 bpm are common and normal. Bradycardia is defined as below 60 bpm at rest while awake.

Why does the band show a different number than my fingers?

The band reads blood volume optically and your fingers read the pressure pulse, and recent exertion, loose contact or arm motion push the two apart. Repeat the reading after 60 seconds and recount for 30 seconds to see which one is stable.

60–100 bpmnormal adult resting range

220 − agerule for maximum heart rate

98%cardiologists preferring 50–90 bpm as desirable resting range in a 1993 study

37–38 bpmresting rate of an ultra-trained athlete

Wrist bands and chest straps

Vitalband — Heart Rate Wristband Guide | vitalband.live

An optical wrist band lights the skin and measures the light that comes back as blood volume changes with every heartbeat, but rapid arm motion can break that reading. A chest strap sits closer to the heart's electrical signal and stays accurate when the wrist does not. This page compares the two, gives a clean resting check, and builds training zones from 220 minus age.

vitalband.live
Vitalband — optical heart rate wrist bands: readings, accuracy, zones
How optical wrist bands read the pulse, how far they can be trusted, and which numbers to train in.

Key figures at a glance

Numeric index

37–38 bpmresting rate of an ultra-trained athleteFar below the 60 bpm lower edge of the normal adult range.

180 bpmestimated HRmax for a 40-year-old220 minus 40 gives 180 bpm, the base for every zone below.

4.6 yearslonger life expectancy in men at 65 bpm vs 80 bpmCopenhagen City Heart Study; women gained 3.6 years at the same comparison.

Measurement routes compared

Measurement routes compared: what each one senses, where it sits, and what distorts it.
Measurement route	What it senses	Where it sits	What distorts it
Wrist optical band	Blood volume at the skin (PPG)	A finger above the wrist bone	Rapid arm motion, loose contact, cold skin
Chest strap	Electrical signal at the torso	Across the chest under the pectorals	Dry electrode contact, strap slip
Finger pulse oximeter	Blood volume at the fingertip	Clip on a fingertip	Poor perfusion, nail polish, hand cold
Ear optical sensor	Blood volume at the ear site	Clipped at the earlobe	Movement of the head, loose clip
Normal resting range	Reference band for a calm body	Measured after 5 minutes of sitting	Recent exertion raises the number
Desirable resting range	Range cardiologists preferred in 1993	Reference band, 50 to 90 bpm	Read against the wrong context
Training zone (age 40)	65% to 85% of HRmax 180 bpm	117 bpm to 154 bpm	Using 220-minus-age as a hard ceiling

Measurement routes compared: what each one senses, where it sits, and what distorts it.

How accurate is a wrist reading compared with a chest strap?

Wrist optical readings track well at rest and break down during rapid arm motion, while chest straps stay accurate throughout.

Optical wrist sensors use photoplethysmography: an LED lights the skin and a photodiode measures the light returned as blood volume changes with every heartbeat. The reading is a volume proxy, not an electrical signal, so anything that changes blood flow at the skin surface changes the number on the screen.

Chest straps measure the heart's electrical activity directly at the torso. In a Stiftung Warentest bike-ride test the wrist tracker failed to track the ride accurately, and chest straps are recommended for maximum accuracy in that situation.

At rest, with the arm still and the band in contact with skin, the two methods usually agree closely enough for zone training. The gap opens as soon as the arm swings hard, the band loosens, or the skin is cold.

Steady state, arm still: wrist optical and chest strap readings normally match closely.
Rapid arm motion, for example a bike ride: wrist readings can fail to track; a chest strap is recommended.
Loose contact or sweat under the band: the photodiode picks up ambient light and the reading drifts.
Cold skin at the wrist: blood volume changes shrink and the optical signal weakens.

Terms used on this page

Photoplethysmography (PPG): An optical method in which an LED lights the skin and a photodiode measures the light returned as blood volume changes with every heartbeat.
Tachycardia: A resting heart rate above 100 bpm.
Bradycardia: A resting heart rate below 60 bpm.
Maximum heart rate (HRmax): The highest heart rate reached under maximal effort, loosely estimated as 220 minus age in years.
Chest strap: A wearable that reads the heart's electrical signal at the torso and is recommended for maximum accuracy when the arm moves fast.
Training zone: A band of heart rate, expressed as a percentage of HRmax, that bounds the intensity a session is meant to hold.

Questions readers actually ask

Can I trust my wrist band during a bike ride?: No, not for that session. In a Stiftung Warentest test the wrist tracker failed to track the ride accurately, and chest straps are recommended for maximum accuracy.
What heart rate should I train in at age 40?: Between 117 bpm and 154 bpm for most sessions. HRmax is 220 minus 40, which is 180 bpm, and 65% and 85% of 180 bpm are 117 bpm and 154 bpm.
Is 45 bpm while I sleep a problem?: No, sleeping heart rates around 40 to 50 bpm are common and normal. Bradycardia is defined as below 60 bpm at rest while awake.
Why does the band show a different number than my fingers?: The band reads blood volume optically and your fingers read the pressure pulse, and recent exertion, loose contact or arm motion push the two apart. Repeat the reading after 60 seconds and recount for 30 seconds to see which one is stable.

How this record was assembled

Figures were taken from published heart rate references and from the tests and studies cited beside them. No measurement was performed for this page, and no product was tested here.

Sources

Sources are the heart rate references and tests named in the text above.