Another Reason Why Exercise Intensity May Be More Important Than Exercise Duration

Move­ment pro­motes the health of every aspect of your being, includ­ing

  • your heart, lungs and car­dio­vas­cu­lar sys­tem
  • bone and mus­cle health
  • endocrine bal­ance
  • mood and social rela­tion­ships
  • even the high­er brain func­tion of cog­ni­tion

When it comes to think­ing bet­ter and sharp­en­ing your mem­o­ry, it turns out that the over­all length of time you exer­cise isn’t crit­i­cal­ly impor­tant.  How hard you work is.

The lat­est info comes from a research project under­tak­en at the School of Med­ical Sci­ences in West­ern Aus­tralia.  Sci­en­tists there stud­ied the rela­tion­ship of exer­cise inten­si­ty to mem­o­ry and oth­er cog­ni­tive func­tion in old­er adults.

The study par­tic­i­pants wore exer­cise mon­i­tors around their waists for a week.  These mea­sured the total amount of time the sub­jects spent exer­cis­ing, and it also cap­tured the lev­el of inten­si­ty of their activ­i­ties.  Par­tic­i­pants were giv­en a bat­tery of mem­o­ry and cog­ni­tion tests before, dur­ing and after the study peri­od.

The sci­en­tists assumed they’d be able to draw a link between total time spent exer­cis­ing and the scores on the mem­o­ry tests.  But they found only a weak rela­tion­ship, if any.  How­ev­er, when they cor­re­lat­ed mem­o­ry func­tion with exer­cise inten­si­tybin­go! – all the dots lined up.

It turns out that many of the health ben­e­fits of exer­cise arise from the inten­si­ty of the exer­cise, not the dura­tion.  That means you’re bet­ter off per­form­ing short peri­ods of heart-pound­ing exer­cise (45 sec­ond-long bursts climb­ing stairs, intense weight-lift­ing, etc.) rather than under­tak­ing a 10 kilo­me­ter run or 45 minute walk at a mod­er­ate pace.

You want to imi­tate the pat­tern of activ­i­ty of a pale­olith­ic hunter/gatherer. Most of the day you’re gath­er­ing nuts and berries, strolling through the for­est at a leisure­ly pace.  You’re hard­ly ever sit­ting still.  Then, once in a while, when you spot a wilde­beest with­in range, there’s a short burst of fran­tic run­ning and spear-chuck­ing.

Then, once you’ve dragged the car­cass back to your vil­lage, there’s a big par­ty with feast­ing and danc­ing.


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About Aaron Bynen

Aaron is a health conscious individual living in the Pacific Northwest.
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