Out fishing with Annie on his lap, a cigar in one hand and a ginger ale in the other, watching the sunset.
Join Date: Mar 2006
Location: South Florida
Bikes: Techna Wheelchair and a Sun EZ 3 Recumbent Trike
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If you expend greater effort, and raise the HR more by riding faster and harder, then the calorie burn does increase, but over a shorter time period.
If you burn X calories over a shorter time span or over a longer span, it's still X calories. The longer time period has you spending more time in the zone where you are operating in the Fat/Protein metabolism rather than the more high energy Carb/Glycogen cycle is the only real difference.
Longer and slower is marginally better for fat burn, yeah, but it's not that critical when applied to shorter time periods like the commute to work. It really applies on longer weekend rides where you are spending hours in the saddle rather than minutes. That is where you'll hit your most efficient fat burn. Enjoy the speed increase and efficiency increase with no guilt, because it's actually a form of periodization and helps keep the body from adapting to a routine of exercise by doing fast and hard during the week and long and slow on the weekend.
. “He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you.”- Fredrick Nietzsche
"We can judge the heart of a man by his treatment of animals." - Immanuel Kant