We review the wearable gadgets that can boost your health

From digital insoles that correct your walk to bracelets that chart your fertility, wearable health technology is a booming industry. From digital insoles that correct your walk to bracelets that chart your fertility, wearable health technology is a booming industry Activity and heart 'watch' Fitbit Charge 5, £129.99, fitbit.com Claim: The 'most advanced' Fitbit, this monitors activity, heart rate and sleep patterns, checks for 'irregular heart rhythms' with an ECG and measures stress with an electrodermal activity sensor, says the maker. 7/10 Sleep tracker you pop in your pocket WHOOP 4.0, £264, whoop.com Claim: Worn on the wrist or put inside pockets in sports bras and pyjamas to monitor 'heart rate, respiratory rate, blood oxygen level and skin temperature, it also tracks sleep and breathing patterns', says the maker. Expert verdict: 'Monitoring heart rate and physical movement while sleeping provides a little information, but to measure overall sleep quality requires a polysomnogram — a brain scan where electrodes measure brain waves, muscle movements, breathing and heart rate,' says Professor Swaine. 8/10 Watch to check hydration Mifo Walkabout Watch 2, £69.99, mifo.co.uk Claim: 'A waterproof smartwatch which measures heart rate, blood oxygen, hydration, sleep patterns and stress levels,' says the maker.