Separating the effect of one specific aspect of physical activity and understanding its association with risk of early death is complex.
Speeding up your walking pace could extend your life, say scientists who have found that a brisk or fast gait significantly reduced the risk of early death.
Walking at an average pace was found to be associated with a 20 per cent risk reduction for all-cause mortality compared with walking at a slow pace, while walking at a brisk or fast pace was associated with a risk reduction of 24 per cent.
A similar result was found for risk of cardiovascular disease mortality, with a reduction of 24 per cent walking at an average pace and 21 per cent walking at a brisk or fast pace, compared to walking at a slow pace.
The protective effects of walking pace were also found to be more pronounced in older age groups. Average pace walkers aged 60 years or over experienced a 46 per cent reduction in risk of death from cardiovascular causes, and fast pace walkers a 53 per cent reduction.
"A fast pace is generally five to seven kilometres per hour, but it really depends on a walker's fitness levels; an alternative indicator is to walk at a pace that makes you slightly out of breath or sweaty when sustained," said Emmanuel Stamatakis, from University of Sydney in Australia.
Researchers sought to determine the associations between walking pace with all-cause, cardiovascular disease and cancer mortality.
Linking mortality records with the results of 11 population-based surveys in England and Scotland between 1994 and 2008 - in which participants self-reported their walking pace - the research team then adjusted for factors such as total amount and intensity of all physical activity taken, age, sex and body mass index.
"Walking pace is associated with all-cause mortality risk, but its specific role - independent from the total physical activity a person undertakes - has received little attention until now," said Stamatakis, lead author of the study published in the British Journal of Sports Medicine.
"While sex and body mass index did not appear to influence outcomes, walking at an average or fast pace was associated with a significantly reduced risk of all-cause mortality and cardiovascular disease. There was no evidence to suggest pace had a significant influence on cancer mortality however," said Stamatakis.
"Separating the effect of one specific aspect of physical activity and understanding its potentially causal association with risk of premature death is complex," Stamatakis said.
"Assuming our results reflect cause and effect, these analyses suggest that increasing walking pace may be a straightforward way for people to improve heart health and risk for premature mortality - providing a simple message for public health campaigns to promote," he said.
"Especially in situations when walking more isn't possible due to time pressures or a less walking-friendly environment, walking faster may be a good option to get the heart rate up - one that most people can easily incorporate into their lives," he added.