Is it true that petites should do less cardio?

You're reading junk information if the word used is in fact "cardio". Cardio has no definition. It means different things to different people. If you see that word, you know the source is a bad one.

For some, "cardio" is just aerobics. For others "cardio" is a form of aerobic training specifically for cardio-vascular fitness which usually means keeping the heart rate at 80% of max. However, in the past decade, exercise physiologist have discovered that the book "Aerobics", which launched the jogging and fitness craze of the past 40 years and coinded the term "aerobics", was quite misleading if not patently wrong. For more in this, check this quote: "The current mania for "aerobics" in the fitness industry stems from a misunderstanding of two factors: The function of the cardiovascular system, and the identification of skeletal muscle as the window through which optimum loading of the entire metabolic system(s) --including the cardiovascular system--takes place." Ref: http://www.mikementzer.com/aerobic.html

Everything we do is aerobic unless it results in momentary muscle failure such as strength training. And, anything we do in the form of activity is better fitness-wise than doing nothing...being completely sedentary. That's not saying much. Recently, however, science has shown that intensity of exercise is the holy grail of fitness, not low intensity aerobics. So, those who wish the max amount of benefits with the least amount of time and risk are using HIT, HIIT, and/or SIT. All of that only serves to further confound the use of the word "cardio".

I would suggest that you forget about "cardio" and concern yourself with creating fitness goals and a plan to achieve them. Being petite has nothing to do with anything, especially a meaningless phrase as "less cardio". Less cardio by time and rate or by energy expenditure or by intensity?? Who knows what is meant especially when the word "cardio" has no definition.

The answer to your question is "No" but only because it can't be "Yes". And whatever those sources to which you refer are, they most certainly are wrong if you're quoting them correctly.

Good luck and good health!!

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No they need more cardio

:)