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xPowerLap — Dr. Skiba xPower per Lap and Session This data field implements Dr. Philip Skiba's xPower (the physiological counterpart to Coggan's Normalized Power). xPower is the 4th-root of the mean of the 4th powers of an exponentially weighted moving average (EWMA) of power with a 25 s time constant. It weights high-power efforts exponentially to reflect metabolic cost (Skiba, 2006-2008). Lap handling: xPowerLap maintains two independent states. Total (session) accumulates from activity start and is never reset. Lap state (EWMA_lap, EWMA_4_lap, seg_lap, xPower_lap) is reset on every lap (onTimerLap, manual or AutoLap). The frozen xPower_lap of the finished lap is published to the FIT LAP field before the reset, so the Laps table always gets the correct value. This gives a true per-interval xPower isolated to the current lap, while still showing the whole-ride xPower for comparison. FIT file (when "Save metrics to .fit file?" is enabled): - id0 RECORD FLOAT "xPower" — xPower_total sampled every second → continuous chart in Garmin Connect - id1 SESSION FLOAT "xPowerSession" — final xPower_total → Activity Summary - id2 LAP FLOAT "xPowerLap" — xPower_lap frozen per lap → Laps table Requirements: - Power meter required. Recording interval 1 s recommended (works with any interval, dt-exact). - Autopause can stay enabled (timerTime based dt). References: - Skiba PF. Calculation of Power Output at Different Effort Durations. 2006. - Skiba PF, Clarke D, Vanhatalo A, Jones AM. Validation of a Novel Intermittent W′ Model... 2014 (EWMA/xPower basis). - Coggan AW. Normalized Power concept (xPower is Skiba's exponential variant).

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xPower LAP & SESSION · Snímek obrazovky 0 xPower LAP & SESSION · Snímek obrazovky 1

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D2™ Mach 1 Pro Edge® 1000 Edge® 1000 Edge® 1000 Edge® 1000 Edge® 1000 Edge® 1000 Edge® 1030 Edge® 1030 Edge® 1030 Plus Edge® 1030 Plus Edge® 1030, Bontrager Edge® 1040 Edge® 1040 Edge® 1050 Edge® 130 Edge® 130 Edge® 130 Plus Edge® 130 Plus Edge® 520 Edge® 520 Edge® 520 Edge® 520 Plus Edge® 520 Plus Edge® 530 Edge® 530 Edge® 540 Edge® 550 Edge® 820 Edge® 820 Edge® 820 Edge® 820 Edge® 820 Edge® 820 Edge® 830 Edge® 830 Edge® 840 Edge® 850 Edge® Explore Edge® Explore 1000 Edge® Explore 2 Edge® Explore 820 Edge® MTB Enduro™ Enduro™ Enduro™ 2 Enduro™ 3 epix™ (Gen 2) epix™ (Gen 2) epix™ Pro (42mm) epix™ Pro (47mm) epix™ Pro (51mm) fēnix® 5 fēnix® 5 fēnix® 5 Plus fēnix® 5 Plus fēnix® 5S fēnix® 5S fēnix® 5S Plus fēnix® 5S Plus fēnix® 5X fēnix® 5X fēnix® 5X Plus fēnix® 5X Plus fēnix® 6 fēnix® 6 fēnix® 6 Dual Power fēnix® 6 Pro fēnix® 6 Pro fēnix® 6 Pro Dual Power fēnix® 6 Pro Solar fēnix® 6 Solar fēnix® 6S fēnix® 6S fēnix® 6S Dual Power fēnix® 6S Pro fēnix® 6S Pro fēnix® 6S Pro Dual Power fēnix® 6S Pro Solar fēnix® 6S Solar fēnix® 6X Pro fēnix® 6X Pro fēnix® 7 fēnix® 7 fēnix® 7 Pro fēnix® 7S fēnix® 7S fēnix® 7S Pro fēnix® 7X fēnix® 7X fēnix® 7X Pro fēnix® 7X Pro No Wi-Fi fēnix® 8 AMOLED (43mm) fēnix® 8 AMOLED (47mm/51mm) fēnix® 8 Pro fēnix® 8 Solar (47mm) fēnix® 8 Solar (51mm) fēnix® Chronos fēnix® Chronos fēnix® E ForeAthlete 245 ForeAthlete 245 Music ForeAthlete 55 ForeAthlete 645 ForeAthlete 645 Music ForeAthlete 745 ForeAthlete 935 ForeAthlete® 735XTJ Forerunner® 165 Forerunner® 165 Music Forerunner® 245 Forerunner® 245 Forerunner® 245 Music Forerunner® 245 Music Forerunner® 255 Forerunner® 255 Music Forerunner® 255S Forerunner® 255S Music Forerunner® 265 Forerunner® 265S Forerunner® 55 Forerunner® 55 Forerunner® 570 - 42mm Forerunner® 570 - 47mm Forerunner® 645 Forerunner® 645 Music Forerunner® 735XT Forerunner® 735XT Forerunner® 745 Forerunner® 935 Forerunner® 945 Forerunner® 945 Forerunner® 945 LTE Forerunner® 955 Dual Power Forerunner® 965 Forerunner® 970 quatix® 6 quatix® 6X tactix® 7 tactix® 7 – AMOLED Edition tactix® 8 – 47 mm, AMOLED tactix® 8 – 51 mm, Solar