New Delhi, Aug. 15 -- From counting steps and calories to measuring heart rate, sleep duration, stress levels, oxygen saturation (SpO2) and activity level, modern wearables offer a range of benefits. Heart rhythm and ECG patterns can also be measured with some smartwatches today. This increasing flow of information about personal health enables people to recognise changes in their bodies and inspires them to consistently improve their health. For some users, the abnormal patterns may also be an early warning to seek medical help.

But how much can we depend on these devices to give us meaningful insight into our hearts? Experts break down what fitness trackers can tell you, where they hit a wall and why they should never take the place of...