[Skip to Content]
[Skip to Content Landing]
Views 314
Citations 0
Comment & Response
November 2019

Is 4400 Steps per Day the New 10 000 Steps per Day?—Reply

Author Affiliations
  • 1Division of Preventive Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts
  • 2Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts
  • 3Laboratory of Epidemiology and Population Science, National Institute on Aging, Baltimore, Maryland
JAMA Intern Med. 2019;179(11):1602. doi:10.1001/jamainternmed.2019.4701

In Reply We thank Aguiar and colleagues for their letter and very much agree that “Although it is still premature to provide empirically supported step-based recommendations, it is important to consider the implications of [available] findings for public health, physical activity guideline development, and individual goal setting.” It is encouraging to note a congruence between our findings of decreasing mortality rates with more steps taken a day until approximately 7500 steps/d when rates leveled1 and findings of a study by Tudor-Locke and colleagues2 showing approximately 7000 to 8000 steps/d being equivalent to meeting physical activity guidelines. Our study addressed all-cause mortality (and not other health outcomes) among older women (and not other age groups); thus, additional data are needed to obtain a full picture of the associations between physical activity and health. These data are forthcoming: in recent years, an exciting development in the field of physical activity research is the emergence of several prospective cohort studies that collect detailed information on physical activity using devices instead of relying on self-reports, as was traditionally completed. These studies are able to provide novel information, such as that related to light-intensity physical activity, which is not well reported, to inform future physical activity guidelines.3

Limit 200 characters
Limit 25 characters
Conflicts of Interest Disclosure

Identify all potential conflicts of interest that might be relevant to your comment.

Conflicts of interest comprise financial interests, activities, and relationships within the past 3 years including but not limited to employment, affiliation, grants or funding, consultancies, honoraria or payment, speaker's bureaus, stock ownership or options, expert testimony, royalties, donation of medical equipment, or patents planned, pending, or issued.

Err on the side of full disclosure.

If you have no conflicts of interest, check "No potential conflicts of interest" in the box below. The information will be posted with your response.

Not all submitted comments are published. Please see our commenting policy for details.

Limit 140 characters
Limit 3600 characters or approximately 600 words
    ×