Thisquestion arose due to differences in the calorie summary for biking activity between Garmin (760cal) and Polar (985cal). Setup: polar oh1 connected to fenix 6, polar chest strap connected to cellphone, 1hr biking activity.
My activity class is set to 3, I am 6'2, 32yrs old, 115kg. But i do bike 6 times a week, run 3 times, throwing in a few days of jump rope. 
Has anyone fiddled between activity classes and seen calories go up or down? In make case, should I expect it to go up if i set to activity class of 7? (am trying this and let you know but am looking for feedback).
yes i have. there's definitely some effect. the problem i've been wrestling with for years is what to set this activity class at. i wish there was some chart that said ok if your vo2 max is 50, your activity class is x. i haven't found anything, so it's always been basically a guess for me.
I think that, at least to some extent, the watch makes these adjustments for you based on your vo2 max, the amount of training you do, etc. Perhaps not as dramatically as adjusting your activity class manually, though. I always kind of thought the activity class setting was mostly just used when you first set up the watch and it doesn't know your fitness level or training routines yet.
To add, I went on my run, and comparing with my last run, of relatively same distance, relatively same effort (hr and push), my calories for the run were relatively the same (between activity class of 3 and 7).
so last summer i had a polar vantage v. i wore it while using my edge 830 for mountain biking. recorded rides using both devices. it was driving me crazy that the calorie counts were so off between them (using the same HR strap). the garmin was always showing far more calories burned (like 100-200 per ride). i began experimenting with activity levels. I set my level at 7 since forever, but in this case i began to experiment by moving the setting gall the way from 0 to 10. i noticed that when i set it to 0 the garmin was showing an even higherhigher calorie burn. it was slight, but it was there. by the time i got to the 10 setting the polar had overtaken the garmin in calories burned per ride. there's something definitely there, but i don't know what it is and i don't know what to set it at. 7 "feels" about right for me. i sit on my ass all day for work but weight train 4x a week (2-3hrs) and mountain bike 3x a week (2.5-4 hrs). now, according to that chart i should be at an activity class of 10, but when you go 8 or higher it cautions you that this range is for athletes, whiich i am most certainly not. vo2 max is currently 48. so i leave it at 7, not having even the faintest idea if it is tracking accurately or not. and for the record, i have never seen garmin change my activity level for me. i set it at 7 when i get the device and it's still at 7 by the time i'm ready to upgrade to the next device
Yeah, the fact that the watch does not determine your activity level on its own, after wearing it for months on end day and night, non stop but to charge it, is utterly baffling. I am pretty much on the same boat as you, with no clue as to what to set it at. 
I believe the higher your activity is set, the less calories you would burn. Makes sense, the fitter you are... The easier the same activity is. Fitter person needs to work harder to get the same calorific exoeditire
He-he, until today I thought the class has an effect on something including energy expenditure. Following the level of my weekly workout load I have been regularly chsnging it, when I had Fenix 3HR. when I owned a Fenix 5+, and also recently when using F6X
Funny, coming from Suunto devices that used activity class (some auto-calculated with precision to tenths), I have been adjusting this value for years and years on Garmin devices that don't use it :-)
Activity classes allow you to balance activity with your busy schedule, and create accountability with instructors and a group to help you stay consistently active. Assignments and attendance are not required as they are with credit classes.
Once you submit the Request to Enroll form, your registration is considered final. You will receive an email confirmation and transaction receipt. The course fee is charged to your UO billing account.
Faculty, staff, and community members are welcome to register for activity classes. Rec Center membership or facility access is required in order to participate in activity classes held in the Rec. If you register on DuckWeb for a PE class, you will be charged all associated student fees. Be sure to use the above process for noncredit participation in PE activity classes. We will reach out to community members for course fee payment options.
To drop your activity class, email 
S...@uoregon.edu. Refunds are issued according to the UO Office of the Registrar's refund schedule. All refunds incur a nonrefundable processing assessment of $15. No refunds will be issued if requested after the Sunday of week four each term.
Students of all abilities are welcome to participate in Physical Education courses. Students can work with the Accessible Education Center (AEC) and instructors for appropriate accommodations. The AEC can assist students in finding an aide or interpreter if needed to participate in PE courses. PE and Rec will waive the course fee for the aide. Contact Chantelle Russell for further information.
Some classes such as scuba and outdoor pursuits require additional fees for gear, transportation, and certification. Activity classes are assessed a fee because they are not funded by tuition and general fees. Class fees cover the cost of instruction, equipment, administration, and facility maintenance.
Cost of attendance is the estimated cost to attend the UO for the academic year. The Office of Student Financial Aid and Scholarships provides estimates for cost of attendance information that goes beyond tuition and fees, and includes: living expenses (housing and food), books/supplies/equipment, transportation, and miscellaneous personal expenses.
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ATTENTION: Everyone (students, SRC members, non-SRC members) interested in registering for an activity class must sign a liability waiver.
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You may register for classes online or at the front counter of SRC North and South. All fees are paid at the Student Recreation Center and each class has a separate fee structure depending on the nature and cost of the class. We accept Visa, Master Card and Discover cards. All classes have a minimum and maximum number of participants required, depending on the type of class.
Enrollment is based on payment of fees and is on a first come basis. Class will be closed after the maximum has been reached and cancelled 48 hours before the first class session if the minimum is not met. For information on specific classes, please contact us at 
(951) 827-5731.
ACTivity Classes offer UM students the opportunity to a well-balanced class schedule. Each semester, the School of Integrative Physiology and Athletic Training offers over 90 one-credit ACTivity Classes. Classes are graded credit/no credit. ACTivity Classes can assist UM students in maximizing a full course load or meeting credit hour financial aid requirements.
Power to the San Bernardino campus has been restored as of 9:55 a.m. Normal campus operations will resume Friday, July 26th. Essential staff with questions on whether to report should contact their appropriate administrator. Facilities Management will be working to check all building systems including HVAC, elevators and fire alarms. If power has not been restored in your work area when you return, please report that to Facilities Planning and Management at 
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