Subject: Intervals and Fat Loss in Young Women (18-22 y/o)

Hi Friend!



I'm doing research for the next Personalized Treadmill Workout on June 9 and I came across this cool study.



The study compared (15) sprinters, (15) steady-state exercisers and (15) who did neither over a 15 week period, training 3x/wk for 20-40 minutes excluding warm up and cool down.  
  • They rode a bike (so they were non-weight bearing)
  • Sprints intervals were 8sec:12sec, x60 for 20minute total sprint workout
  • 0.5kg increase every time their heart rate lowered during training.
  • Steady-state rode for 20-40minutes.
  • Lean women lost less body fat than overweight women
  • 18-22 y/o women
  • starting BMI b/w 21-25
  • Sprint group lost body fat on legs and trunk
  • Steady-state lost body fat on legs only, while gaining body fat on trunk
  • Sprint group lost on average 5.5 lbs. of body fat in 15 weeks.
  • Steady state group gained roughly 1 lb of body fat in 15 weeks.
  • Not much lean muscle gain in the legs of either group.
  • All participants gained body fat in the arms.
  • Researchers wonder if the sprinters were less hungry or less hungry for calorically dense foods because of sprinting.
Coach's Thoughts
Most research is on college kids or seniors because they have time.  Busy 30-60 year olds are working and raising kids, so they're not usually available to participate in studies.  



I however am niched in this 30-60 year old demographic and see that sprint intervals can work for most of these people, most of the time, but not always, and sometimes steady-state training and/or both is the way to go based on a myriad of reasons (like sleep, hormones, stress, work, family, life, death, ...).



In any event, people who weighed more lost more body fat.  Non-weight bearing cardio can decrease body fat in the lower body and core if its interval based, but it'll do nothing for the arms and you might gain body fat in the core if you do stead-state exercise.  


  • Sprint intervals may make you want to eat better and hold off hunger longer.  
  • Sprint intervals take up less total time (20min vs 40min)
  • Steady state intervals help to build your aerobic base so you can do sprint intervals, though sprint intervals thoughtfully designed can help you build both an aerobic and anaerobic conditioning.  
  • All sprint and steady-state participants used heart rate monitors.  This is the now. Get one.  I've got one member testing a program, while using a heart rate monitor, that I'm considering introducing to our members for next year and another private client using a heart rate monitor on custom programs I've designed for her.  


Final Thought
Schedule your self-care.  Do it.  Mix in both sprints and steady state.  Use a heart rate monitor to learn and make your workouts more interesting.  Remember weight bearing is better than seated cardio, but if you're going to do seated exercises, do sprints for shorter or go long for steady-state, but in both instances, balance out the sitting w/ a full body strength and conditioning program to address the softer arms and core that happens with prolonged sitting.  



Learning and still a fan of bicycling,



Coach Mike



p.s.  here's the link to the abstract and the full study.



p.p.s.  Save the date.  June 9 for the next Personalized Treadmill Workout!

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