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Aerobics/exceeding heart rate target zone

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I am a 50-year old female weighing 137 lbs - in relatively good shape given I have only recently recommitted to regular gym visits (it's hard to get outside for regular walks in winter here).  I am doing well and pushing myself a little harder each time on the treadmill.  However, I am consistently exceeding the target heart rate for 'fat burn' and 'cardio' programs.  For example, the printed target for cardio (on the machine)for my age at 80% is only about 136 (if I recall correctly).  At that rate, I wouldn't even break a sweat and would feel I was taking a relaxed walk in the park).  I feel I am getting a good workout when my heart rate goes up to 160.  Am I putting myself at risk?

Answer
Jane,

If you have no apparant health or medical issues, it is not a problem.  Heart rate calculations are estimates, and many people will not fall into the generalized catagories or target zones.  If it's been a while since you had a medical checkup, it's a good idea to get one.  That way you can be better assured you're cleared for intense cardio exercise.

Glad you're working out.  Keep it up.

Aerobics

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Ken Alan

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To build a strong body, build a strong body of knowledge. Exercise workouts, training programs, classes, program design, workout music, motivation. Cardio, strength, flexibility.

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AeroBeat.com, the first fitness music company. Program design/choreography, 7 Richard Simmons videos. Co-star, 4 Time-Life Medical exercise videos. Chapter author: "Physical Activity Instruction of Older Adults" (Human Kinetics), "Fitness Theory and Practice" (AFAA), "Fitness for Travelers" (ACE). Lecturer, California State University, Fullerton California, Department of Kinesiology.

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