Single point field data. Individual performance within NSC’s Altitude Series. Training toward Whitney. Ontario Peak deferred due to Icehouse Canyon trailhead closure after the storm. Baden-Powell inserted as substitute. Ontario shifts to Benchmark 3.

Activity (full stats, splits, pace)

Pace analysis

Entry climb (trailhead ~5,852 ft): immediate exposure to continuous climbing with no ramp. Pace established in the ~23:00 to 25:30/mi range under sustained grade.

First sustained segment above ~8,000 ft: pace held in the ~24:00 to 25:30/mi range through Throop Peak (~9,117 ft) and into the Baden-Powell summit segment, indicating stabilization after initial transition.

Comparison to Cucamonga: on Cucamonga, pace degradation concentrated near the summit push above ~7,500 to 8,500 ft. On Baden-Powell, load was imposed earlier due to continuous climbing, and pace stabilized once the system adapted rather than degrading further.

Descent (final miles): recovered to 19:04 to 23:05/mi, indicating no systemic fatigue.

Observation: terrain structure shifted where the stress occurred. Cucamonga concentrated stress late. Baden-Powell concentrated stress early. Once stabilized, pace was maintained across higher elevation without further degradation.

Conditions

Cold start at ~5,852 ft in the low 40s. Light wind with intermittent gusts on exposed ridge sections.

Some downhill sections covered in partially melted snow and ice required careful navigation. Microspikes would have been useful in these segments, but conditions were manageable with trail shoes, poles, and reduced pace.

Otherwise, trail conditions were clear.

Active upper respiratory illness at entry. HRV below baseline.

Protocols

Altitude sickness prevention protocol active, initiated 3 days prior.
Exertion headache protocol active on day of hike.

Expectation

Higher elevation exposure and longer time above 8,000 ft vs Cucamonga. Expected earlier onset of breathing limitation due to continuous climbing profile.

Actual

Breathing load elevated immediately during the first sustained climb. Effort felt high relative to pace despite heart rate remaining controlled at ~137 to 140.

Breathing stabilized after ~40 to 60 minutes.

No headache or nausea symptoms. Sustained output maintained across the full distance.

Relative Effort recorded at 504 versus 799 at Cucamonga despite longer distance, greater elevation gain, and extended time above ~8,000 ft.

Observations

Altitude impact occurred at the onset of the climb. The early phase required disproportionate effort relative to output. Stabilization occurred after continuous exposure rather than a gradual ramp.

Time above ~8,000 ft increased materially vs Cucamonga (~2.5 to 3+ hours vs ~60 to 75 minutes), amplifying cumulative altitude stress independent of pace or cardiovascular output.

Heart rate remained stable across both benchmarks while perceived effort diverged under altitude, reinforcing the mismatch between heart rate based zones and actual physiological strain.

Average speed increased (2.5 mph vs 2.3 mph at Cucamonga) despite higher altitude exposure, indicating capacity remained intact once early transition was absorbed.

Terrain structure determined the timing of physiological stress more than elevation itself.

Gear / Hydration / Fueling

Trail shoes and poles were sufficient. Microspikes would have improved efficiency on isolated icy descents but were not required.

Hydration: consistent electrolyte intake maintained.

Recovery, 24hr

HRV suppressed, baseline already reduced due to illness. Overnight RHR elevated (~64 vs baseline mid 40s, Oura). Pattern consistent with cumulative load from distance, elevation, altitude, and illness. Rebound observed within 24 hours, with HRV and RHR returning toward baseline. Pattern consistent with prior benchmark recovery window.

Adjustments, Ontario Peak - 8,696 ft, Benchmark 3

Controlled first 30 to 45 minutes regardless of group pace. Avoid immediate exposure to full climbing intensity.

Introduce micro adjustments early, short pauses or cadence control, to allow breathing to stabilize without full separation.

Maintain early fueling schedule independent of appetite. Increase intake during ascent to avoid late concentration of calories.

Continue electrolyte accessibility without interruption to movement.

Objective: reduce early oxygen mismatch and preserve output across the full ascent.

SpO2 Protocol

Attempted at summit. Unable to obtain a reading. Device did not register oxygen saturation, likely due to environmental factors such as direct sun exposure, lack of shade, or signal interference. Protocol to be repeated at Ontario Peak under controlled conditions.

Benchmark Comparison, Cucamonga (1) vs Baden-Powell (2)