. Step 5: Program It. Might as select a number from rand (200W,400W). Use our calculator to determine your W'. By analyzing the relationship between heart rate and power, Half Monty allows The SYSTM app to calculate your FTP to a much higher degree of accuracy than any other ramp test out there. Note that GPS-calculated elevation may have major distortion and affecting Run Power results. If you're riding a road bike, it's more difficult to use Strava's internal calorie counter. The file should be in gpx format, you can extract it from Strava directly if you go into your activity. Often using the Strava Correct Elevation function will improve this and add consistency to your calculations. How to improve the accuracy of your CdA. . Then see if that wattage matches what you see in Zwift when you're giving it . More. 4 hr. And that's it! Another way is to use the est. Strava estimate = 279. Strava Power Curve. A large change in offset is a sign that the power data is not of sufficient quality for accurate estimate of CdA. But calorie burn estimation varies from 700 to 1200 kcal. The problem appears to be that Strava uses it's own algorithm which can, in some cases, present a big discrepancy in power data. It's very possible to have an Intensity of over 100% if the ride was shorter than an hour". In order to get the most accurate result in terms of power estimation, you can use our tool to upload a representative ride with power and heart rate data. What did he grow a third lung? Editor's note: although the terms are used interchangeably by Zwifters, there is a slight difference between zPower and virtual power on Zwift. No full out . I made the same loop before with a roadie friend with a power meter and power meter average and Strava estimate was within %5-8 . I recently got a power meter so I can now verify my calculations with a calibrated baseline. So if you're unsure if your power numbers are accurate in Zwift, just find the speed above that you can hold outdoors on a flat ride going all-out for 20+ minutes. Therefore, Strava is unable to calculate accurate watts for you - if you would like accurate watts, you could consider getting a power meter . . It's not great. Power output is a useful metric to measure training load and fitness. With a power meter the mechanical energy used during . Which is one of the most useful training analysis tools you can use and especially to learn how to peak for races. Strava estimate = 279. Trying to watch your power in this scenario is useless. P = 0.5 x ρ x v3 x Cd x A. P is the power required. 40kph (24-25 mph) - 301 watts. On the other hand, running power will inevitably be stashed away for Strava premium subscribers and may even create some new subscribers and the yearned-for revenue that Strava . This is an image of a right triangle and the road is represented by the line called "c". 1400 * 4184 / (90 * 60) gives an average of 1084.7 Watt . Ive been running default estimated power for years. Instantaneous power measurements read on Nyon tend to be accurate (matches with. A related measure of work is kilojoules, of which there are 4.186 kJs per 1 Calorie. The Power Curve can be displayed in Watts (W) or Watts per Kilogram (W/kg . These are the power files of Tadej Pogačar's training. 2: Approx. 37.5kph (23-24 mph) - 254 watts. moving a rider and bike from point A to point B. For Garmin to calculate the athletes VO2 Max it collects the following data from each user: 1 - Age and personal background is recorded. Since power meters have become affordable, they're definitely worth the investment. Both are Arduino IDE based. (Little head wind, around 6% avg. 3: On the flat at FTP. The vertical oscillation is not considers like with the Stryd sensor, only the horizontal power. I have the same issue, Strava weighted power is generally 10% lower than my power files (wahoo and quarq) suggest. To get the best estimate of power from Strava without a power meter--make sure to configure your weight, bicycle type and weight, etc. 3 - The data collected from the activity is segmented into different heart rate scales based on the user's background information. If you prefer to run rather than bike, Strava still calculates . Abstract. I'm looking at buying a new smart trainer and have found that power accuracy ranges between 0.5 and 2.5% for a lot of the top trainers. (For this one, I tried to negate wind by riding the same section one way, then the other and averaging the two) Powertap average watts = 382. 45kph (28 mph) - 415 watts. grade) Powertap average watts = 378. Glory Cycles via Flickr. A longer climb (1.3 miles) Strava estimate average power 145W, actual power average 203W max power 337W. Strava does estimate power based on rider weight, bike and elevation, but again it's working with limited data points, so that means the picture it paints is pretty vague. It will use this data, and the miles covered, feet climbed, etc. If you're just . Additionally, our FTP estimation benefits from at least one hard effort of no specific duration, including very long races as well as interval sessions, no need to go out for a classic FTP test. Is strava power calculation accurate? The Edge 510 I had before it was also very accurate. Fitness minus fatigue provides an estimate of your form. They are a joke. So if you're unsure if your power numbers are accurate in Zwift, just find the speed above that you can hold outdoors on a flat ride going all-out for 20+ minutes. Your estimate can be skewed by the following: . I was just wondering how big a difference . 1 minute climb at around FTP. If you have a power meter, it's probably more accurate than calories estimated by heart rate. Drive Train Loss. #2 is less obvious but an estimated power . This is based on Andress Spiess work in YouTube #174. 0 W. Estimated Energy. If you have any questions please . The power to overcome wind resistance can be described by the formula P = 0.5 x ρ x v3 x Cd x A, where P is the power required, ρ is the density of air, v is the velocity you go at, Cd is the drag coefficient and A is the surface area when facing the wind. Ideally, you should perform a new test every 6-8 weeks to track your fitness throughout the season. Strava estimates that my average power for the ride was 218 watts. 3: On the flat at FTP. Power data estimated by Strava will also work fine. This is the same power calculation that is used in the DozenCycle (CIQ 2.0+ devices), but packaged as a simple data field. The Physics of Strava and Power: Through analysing two rides, one up a big hill, and one on the flat, I work out how Strava calculates my power output even t. Rider Weight 0 kg. Menu. Stryd has better accuracy on hills and mountain trails than Strava because Stryd can measure the line called "c". According to Strava's algorithms I averaged 343 watts for this three hour ride. Yet there are certain scenarios/products where a power meter may be less accurate than others, or perhaps it's got known edge cases that don't work. To be precise: * no HRM, no Power Meter: 1250 kcal on average (+- 50) * HRM, no Power Meter: 720 kcal (complete and utter nonsense, BTW) * with Power Meter; 1100 kcal (no matter if HRM is connected or not) Strava reports approximately 1150 kcal, no matter what sensors I use. Since the wattage is that of the whole rider/bike system, Strava's data is most accurate when it knows more about the rider and the bike (e.g. There are 3 main sensors at play when it comes to what power numbers will be shown for an activity on Strava: Power meter. The calorie burn estimate on Strava is more accurate because of the internal calorie counter. . The 1976 paper demonstrated a correlation between form and the performance of an elite swimmers' times over 100m. Actually . Save . Speed sensor. In the final 2km, Carapaz and Pogačar were flying up the mountain at over 7w/kg, which showed that even after 45 minutes at 6w/kg, they had plenty left in the tank. From the desktop version only, go to: Settings > My Gear > My Bikes > Input bike type, brand, and weight. to estimate the actual energy expended. Enter your personal . In order for Strava to determine the number of calories you've burned, you'll need to verify your body weight and the model of your bike. Using recorded GPS data from my bike ride and the laws of motion, we can calculate the power output of the rider. Finally, the cyber-elephant in the virtual-room. Answer (1 of 3): Strava is about as accurate as the GPS that feeds it data. For the most accurate calorie counts on your rides, use a power meter, which measures the work you are performing. Cd is the drag coefficient. Is an accurate cycling estimated power for all device types. As time passes Strava will tweak or change their algorithm for computing estimated power. The other data looks consistent (HR, cadence). Only show this user. This article should have started by saying that Strava power estimates are very inaccurate. A good coach can . 0 kJ total. A is the surface area of the rider facing the wind. To get the best estimate of power from Strava without a power meter--make sure to configure your weight, bicycle type and weight, etc. You may wonder how we could possibly know the wind speed or air density during your . On 4 almost identical rides last week these were my results: Ride 1: MFP estimate only - Bicycling, 12-14 mph, moderate (cycling, biking, bike riding) Time: 23 Calories: 344. If you don't create and select a bike for your activity, a default road bike weight of 9kg, or 20lbs, will be used. So, we are supposed to believe he gained 50% MORE power at that duration within just the past year? It is annoying to have two different numbers side by side. Strava uses your weight, bike's weight, distance covered, and elevation gained to create an overall power output to help calculate estimated calories burned. You must do these 2-things. Accuracy. Are cycling power meters worth it? If that's your phone, it may depend where you wear or carry your phone - your body can occlude the signal from some of the satellites making it somewhat less accurate. Also, regarding different readings, the estimated power can vary significantly between the device you use. Then edit the activity and select your bike. grade) Powertap average watts = 378. Climbing Power. A recent addition to Strava's Premium toolset is BEACON. Forums New . S-Pedelec Vado: very accurate on certified Electrak 2.0 tyres. The running power is saved to FIT. 2: Approx. Ride as hard as you can for approximately 3-minutes, keep going if you can go longer than 3. (The most common difference currently is about 10 watts on a ride.) Strava support tend not to agree with this assertion. Ah I wouldn't trust Strava on it's own with an electric bike, I tried it once and it said 1,200! The CdA estimate uses the observed weather combined with power, speed and elevation data to calculate your drag. FinalZwiftConnect with files DFRobot_OxygenSensor.cpp and DFRobot_OxygenSensor.h are used when the unit is broadcasting VO2 max to either Zwift or Strava. When data from a power meter is not available, Strava can estimates power using information about an athlete's weight, speed, and elevation change. Carapaz - final 2km of Col du Portet Time: 5:53 Average Power: 402w (6.7w/kg) Normalized Power: 446w (7.4w/kg) Pogačar - Col du Portet Time: 49:00 Estimated Average Power . "Instead, just try reducing carbohydrate intake on your low . 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