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Fitness Skating and Training Forum Discussions about on-skate and off-skate training, hydration, sports nutrition, weight loss, injuries, sports medicine, and other topics related to training and physical fitness for skaters.

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Old August 26th, 2010, 08:13 PM   #1
Join Date: Sep 2009
Posts: 30
Default calorie calculations on Garmin 305

I'm recovering from a speed skating injury (broken fibula). My physical therapist recommended cycling as a good general exercise to gain strength again. I have the Garmin 305 forerunner watch and have been trying to track my heart rate and calories burned. The watch has been telling me that I am burning 12-13 calories per minute during my cycling workouts. Using the standard numbers for my age, I've been working between 75 and 85% of MHR. My recent cycling workouts have been around 40 minutes each giving me about 500 calories burned.

I was thinking of adding the Garmin GSC 10 speed/cadence sensor to my bicycle. Will the addition of this sensor improve the accuracy of the calories expended calculation? I would also appreciate any comments on whether this sensor is a 'toy' or a tool for the skater in training. I haven't bought it yet because I have a feeling that it is a toy...

Also, I have been combing this forum for information on heart rate monitoring, interval training and general exercise information. I really enjoyed a link provided to a women's health website. I'm male, but the articles were pretty good. Can folks recommend exercise and health related news/article sites?


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Old August 27th, 2010, 03:38 AM   #2
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Join Date: Aug 2009
Location: Miami, FL
Posts: 384

I did not notice a change in the calorie computations when I installed my GSC-10 on my bike. I do like to check my cadence from time to time (it is usually too low) and hence have rationalized the non-toyness of my GSC-10. The things that I have notice affecting the calorie computation are
  • speed
  • elevation
  • user weight
  • bike weight
As far as I can tell, heart rate does not seem to affect the calorie computations.

In my case I feel that my Garmin 305's calorie computations for biking are reasonably accurate.
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Old August 28th, 2010, 01:53 AM   #3
Join Date: Sep 2009
Posts: 30


Thanks for the reply. I've been enjoying the cycling. I think I'll give the non-toy a go.

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Old September 2nd, 2010, 01:12 AM   #4
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Join Date: Aug 2007
Location: Atlanta, GA
Posts: 65
Default My thoughts

I agree that on the 305, heart rate doesn't really come into play (HR based calculations is one of the features of the 310XT - much more expensive). I have found that in "bike" mode, the calorie count for the 305 during biking is within a reasonable amount of what mapmyride.com calculates (not exact, but usually within ~10%) The speed/cadence sensor doesn't change this, but just makes it more accurate when you have weak GPS signal, and allows you to check your cadence. I've been trying to hold my cadence near 90, and this really helps to remind me.

Another useful thing is to get the quick-release wrist band, and the bike mount, so you can easily move the 305 between your bike and skate sessions.
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