Japan is sweltering under its worst heatwave for almost 150 years. The city of Isesaki, northwest of the capital, saw a record 40.2C - the highest temperature ever recorded for Japan. There are official warnings of a looming power shortage and calls for people to conserve energy where possible. But the government is still advising people to use air conditioning to avoid heatstroke as cases of hospitalisation rise with the heat. Meteorologists warn the heat will continue in the coming days. Pray for the elderly and those with heart disease. In the heat blood vessels open up, leading to lower blood pressure. The heart works harder to push the blood around the body which could lead to a heart attack. Weather officials warn the heat is likely to continue in the coming days. See also