First, thank you for a very important and well-written article [BCMJ 2016;58:203-209 [10]].I took a look at the four recent studies that were discussed in the “How much exercise is enough?” section and wonder if you can shed light on something. The clearest U-curve is found in the study on Copenhagen joggers.[1,2] The study on runners in Texas[3] also showed a U curve though it was less striking. The study on all forms of exercise in Taiwan,[4] however, showed a continued benefit with longer and more vigorous exercise.
The main differences in these studies that I found were:
I didn’t see any obvious differences in other subject characteristics, though I may have missed something.
Are there any other studies suggesting differences in exercise benefits among different races or exercise modalities?
Thanks again for a stimulating article!
—Joel Fox, MD (PGY-1 Psychiatry)
Vancouver
1. Schnohr P, Marott JL, Lange P, et al. Longevity in male and female joggers: The Copenhagen City Heart Study. Am J Epidemiol 2013;177:683-689.
2. Schnohr P, O’Keefe JH, Marott JL, et al. Dose of jogging and long-term mortality: The Copenhagen City Heart Study. J Am Coll Cardiol 2015;65:411-419.
3. Lee DC, Pate RR, Lavie CJ, et al. Leisure-time running reduces all-cause and cardiovascular mortality risk. J Am Coll Cardiol 2014;64:472-481.
4. Wen CP, Wai JP, Tsai MK, et al. Minimum amount of physical activity for reduced mortality and extended life expectancy: A prospective cohort study. Lancet 2011;378(9798):1244-1253.
Links
[1] https://bcmj.org/cover/september-2016
[2] https://bcmj.org/author/joel-fox-md-pgy-1-psychiatry
[3] https://bcmj.org/node/100
[4] https://bcmj.org/sites/default/files/BCMJ_Vol58_No7_pv%20%28ID%20106122%29_0.pdf
[5] https://bcmj.org/print/letters/re-impact-excessive-endurance-exercise
[6] https://bcmj.org/printmail/letters/re-impact-excessive-endurance-exercise
[7] http://www.facebook.com/share.php?u=https://bcmj.org/print/letters/re-impact-excessive-endurance-exercise
[8] https://twitter.com/intent/tweet?text=Re: The impact of excessive endurance exercise&url=https://bcmj.org/print/letters/re-impact-excessive-endurance-exercise&via=BCMedicalJrnl&tw_p=tweetbutton
[9] https://bcmj.org/javascript%3A%3B
[10] https://www.bcmj.org/articles/impact-excessive-endurance-exercise-heart
[11] https://bcmj.org/modal_forms/nojs/webform/176
[12] https://bcmj.org/%3Finline%3Dtrue%23citationpop