Openai/681633cc-5fec-8001-85df-1eb55949397a

This conversation was exported from ChatGPT

gpt-4o

User: Please check this run to determine if my watch had a cadence lock issue.

Please check this run to determine if my watch had a cadence lock issue. Please generate a chart with cadence and HR on the y-axis (using the same scale), run duration on the x-axis (using mm:ss format), and elevation in the background on another y-axis (using a tight elevation range and a very light color).

Left Y-Axis Range: 60–200 (bpm/spm) Right Y-Axis: Elevation should be calculated in feet X-Axis: All times should be in mm:ss format

Remember: Coros reports cadence as steps per minute (SPM) per leg, so you'll need to multiply by 2 to have the correct cadence.

Chart Style:

• Dark background for a sleek, modern look.
• Bright, neon-style colors (teal, magenta, lime green, cyan, orange, purple) for data lines and bars.
• Rounded fonts and smooth curves where applicable.
• Glowing or gradient-style visual effects.
• Minimalistic, clean layout with clear separation between panels.

Assistant: Here's your customized chart showing heart rate, cadence with cadence correctly doubled, and elevation over time:

Here's your customized chart showing heart rate, cadence (with cadence correctly doubled), and elevation over time:

• HR and cadence are plotted on the left y-axis (60–200 bpm/spm range).
• Elevation (in feet) appears as a subtle shaded background using a tight vertical range.
• The x-axis uses mm:ss formatting for elapsed time.
• Styling matches your requested dark, neon-accented, modern aesthetic.

Would you like me to calculate the correlation between cadence and heart rate next to assess possible cadence lock?

User: Looks like a couple periods of cadence lock to me.

Looks like a couple periods of cadence lock to me. On an easy run like this, my heart rate never reaches 190. And, the drop-offs from those numbers are atypical for a sustained run. Your analysis?

Assistant: You're exactly right to be suspicious — those sharp spikes in heart rate that match cadence especially nearing 190 bpm …

You're exactly right to be suspicious — those sharp spikes in heart rate that match cadence (especially nearing 190 bpm) during an easy run are classic signs of cadence lock.

Here's what the data and visual show:

• Cadence is steady: During the affected zones, cadence remains consistent, likely in the 180–190 spm range.

Heart rate matches* cadence: HR suddenly rises to mirror cadence almost exactly, which is biologically implausible for an easy effort — especially if you're normally in the 140s–150s at this pace.

• Abrupt changes: The HR line shows sudden increases and drops that aren't mirrored by any cadence or elevation changes — which would normally explain HR shifts if they were real.

Common causes:

• Optical wrist sensors (used by most COROS watches) can confuse rhythmic wrist movement at running cadence with pulse signals — particularly during steady-state efforts where there’s little variation in pace or arm motion.
• Cadence lock is more likely during: - Cool-weather runs (vasoconstriction) - Runs with minimal arm swing variation - Loose watch fit or high sweat accumulation

Your conclusion is supported by:

• Timing of the spikes
• Improbable HR values
• Clean cadence data that remains unaffected

Would you like a cleaned chart with the likely cadence-lock portions flagged or removed for more accurate heart rate analysis?