WEEK 2 REVIEW — Health Experiment Week 2 Review: Disruption, Recovery and New Discoveries | Days 8–15
If Week 1 of this health experiment was the story of building a foundation — CPAP compliance from near-zero and weight crossing below 100 kg for the first time — then Week 2 was the stress test. A late meal broke the fasting window. A social weekend pushed weight to its highest point since Day 1. A new mask failed twice. Blood pressure readings opened a chapter nobody expected. Finally, a 48-hour fast, a pre-dawn gym session, and a heart rate variability reading that is the highest of the entire experiment concluded the week. Week 2 was harder than Week 1 but more instructive. Here is what it produced. This is the health experiment week 2 review.
Weight: The Week 2 Arc
| Day | Date | Eufy Weight | Notes |
|---|---|---|---|
| Day 7 (Week 1 close) | 7 Apr | 99.4 kg | Series low entering Week 2 |
| Day 8 | 8 Apr | 100.2 kg | Late meal outside fasting window |
| Day 9 | 9 Apr | ~100.2 kg | Rest day, knees |
| Day 10 | 10 Apr | No weigh-in | Late night, forgot scales |
| Day 11 | 11 Apr | 99.95 kg | Back below 100 kg |
| Day 12 | 12 Apr | 100.90 kg | Social Saturday — wine, cheese |
| Day 13 | 13 Apr | 101.10 kg | Post-weekend peak — series high for Week 2 |
| Day 14 | 14 Apr | ~100.5 kg | Recovery begins |
| Day 15 | 15 Apr | 99.35 kg (am) / 99.05 kg (pm) | New series low |
The Week 2 weight story is one of disruption and recovery rather than the clean downward line of Week 1. Week 1 saw weight move from 102.0 kg to 99.4 kg — a steady 2.6 kg reduction. In contrast, Week 2 experienced significant oscillation, climbing to 101.10 kg after the social weekend before the 48-hour fast pulled it down to a new series low of 99.35 kg on the morning of Day 15 and 99.05 kg by the afternoon.
The net movement across Week 2 is modest: from 99.4 kg to 99.35 kg. However, that figure conceals a meaningful story. The body was disrupted, responded predictably, and recovered. The capacity to recover quickly — returning from 101.10 kg on Day 13 to 99.35 kg on Day 15 — is a positive signal, one that wouldn’t have been visible without daily measurement.
CPAP: Week 2’s Most Variable Chapter
| Night | Date | Usage | Score | AHI | Notes |
|---|---|---|---|---|---|
| Night 7 | 7 Apr | 6h 25m | 89/100 | 1.8 | Restless — 7 mask-offs, lowest AHI of series |
| Night 8 | 8 Apr | 8h 19m | 100/100 | 2.1 | Perfect score — series equal best |
| Night 9 | 9 Apr | 5h 01m | 78/100 | 1.7 | Short night — coffee at 9am, late bed |
| Night 10 | 10 Apr | 4h 50m | 78/100 | 5.1 | Two short nights in a row |
| Night 11 | 11 Apr | ~3.5h (split) | — | — | Full face mask attempt — abandoned after 1h |
| Night 12 | 12 Apr | 4h 49m | 78/100 | 3.5 | Late bed (02:45) post-social weekend |
| Night 13 | 13 Apr | 7h 14m | 96/100 | 2.9 | Return to form — full face mask |
| Night 14 | 14 Apr | 8h 03m | 96/100 | 2.9 | Earliest bed (21:29) — strong night |
The CPAP compliance chart tells the Week 2 story visually better than words can. Night 8 matched the series high with a perfect 100/100 score and 8 hours 19 minutes of usage. Then followed three consecutive shorter nights due to social disruptions, late bedtimes, and an ill-timed experiment with the full face mask. Fortunately, the final three nights of the week restored strong compliance, concluding with 8 hours 3 minutes on Night 14.
The introduction of the full face mask is the defining CPAP subplot of Week 2. The nasal pillows were producing nose soreness on consecutive nights; the full face mask was the logical alternative. Night 11’s attempt ended after approximately one hour due to pressure and comfort issues. Nights 13 and 14 saw a partial solution — full face mask for the first hour before swapping to nasal pillows — with both nights producing usage times well above the clinical compliance threshold. The mask settings conversation with the CPAP supplier is the outstanding action point entering Week 3.
Blood Pressure: Week 2’s Biggest New Story
Blood pressure monitoring was not part of the original experiment design. It became one on Day 13, when the first readings arrived at 139/92 — the highest of the series — and the decision was made to track it daily. What followed over the next 48 hours was one of the most compelling data sequences the experiment has generated.
| Day | Date | Average BP | Pulse | Context |
|---|---|---|---|---|
| Day 8 | 8 Apr | 117/74 | 75 bpm | Post late-meal |
| Day 9 | 9 Apr | 115/73 | 70 bpm | Rest day |
| Day 12 | 12 Apr | 134/94 | 60 bpm | Morning after wine |
| Day 13 | 13 Apr | 139/92 | 61 bpm | Post-weekend peak |
| Day 14 | 14 Apr | 118/86 | 72 bpm | Recovery — walk, fast resumes |
| Day 15 | 15 Apr | 105/78 | 96 bpm | All readings green |
Blood pressure monitoring was not part of the original experiment design. It became one on Day 13, when the first readings arrived at 139/92 — the highest of the series. A decision was made to track it daily. What followed over the next 48 hours was one of the most compelling data sequences the experiment has generated.
The resting heart rate arc across the series is worth noting. From above 90 bpm in the early days to 60–70 bpm by the end of Week 2, the Hume Band showed a resting rate of 55 bpm on the afternoon of Day 15. The improvement in CPAP compliance, the consistent aerobic exercise, and dietary changes are collectively visible in that number.
HRV: The Week 2 Trend
Heart rate variability has been the Hume Band’s most consistent and credible metric throughout the series. The Week 2 arc is encouraging despite the disruptions.
| Day | HRV (Hume Band) |
|---|---|
| Day 6 (series high, Week 1) | 76.1 ms |
| Day 11 | 83.7 ms |
| Day 13 | 79.6 ms |
| Day 14 | 76.0 ms |
| Day 15 | 88.5 ms — new series high |
The 88.5 ms reading on Day 15 is the headline. It arrives after the 48-hour fast, the earliest bedtime of the experiment, and eight hours of CPAP therapy. The HRV trend across the full two weeks is clearly upward — from the 46–80 ms range of Week 1 to a sustained position in the upper seventies and eighties in Week 2. What looked like cardiovascular improvement in Week 1’s Health Report is continuing to develop in Week 2’s data.
Key Events: What Week 2 Actually Taught
The late meal on Day 8 produced an immediate and measurable reversal across multiple metrics. One meal eaten outside the fasting window inflated weight, body fat percentage, and water retention by morning. The lesson was not new. The data made it undeniable.
The full face mask has become the experiment’s most persistent unresolved question. Two nights of partial success — good therapy for the first hour, then a swap to nasal pillows — suggest a settings problem rather than a fit problem. The ramp time and pressure ceiling need adjustment. This is the first action item for Week 3.
The social weekend demonstrated the experiment’s most valuable capability: not preventing disruption, but making its effects visible and measurable. A bottle of red wine, a late night, and two days of dietary looseness produced a specific, quantifiable signature across weight, blood pressure, CPAP usage, and sleep quality. The data did not judge. It simply recorded. And the recovery from that signature was equally visible and equally fast.
The 48-hour fast closing Week 2 was both a reset and a test. Weight reached its new series low. HRV reached its new series high. Blood pressure returned to optimal. The gym happened before sunrise on an empty stomach at the halfway point of the experiment. None of those things are small.
Week 1 vs Week 2: The Honest Comparison
| Metric | Week 1 | Week 2 |
|---|---|---|
| Weight change | 102.0 → 99.4 kg (−2.6 kg) | 99.4 → 99.35 kg (−0.05 kg net) |
| Weight range | 102.0–99.4 kg | 100.2–101.10 kg peak / 99.05 kg low |
| CPAP best night | 8h 29m / 100/100 | 8h 19m / 100/100 (equal) |
| CPAP average usage | Building — 4.5h avg | More consistent — 6h+ avg |
| Best BP reading | 104/72 (Day 7) | 105/78 (Day 15) |
| Worst BP reading | 117/78 (Day 6) | 139/92 (Day 13) |
| HRV best | 76.1 ms (Day 6) | 88.5 ms (Day 15) |
| Exercise | 3 gym sessions + cycling + walking | 2 gym sessions + 1 walk (knee-managed) |
| Alcohol | ½ glass prosecco | 1 bottle red wine (Day 12) |
Week 1 produced cleaner numbers, while Week 2 produced more revealing ones. The disruptions of Week 2 — the late meal, the social weekend, the mask experiments, and the short nights — created conditions that exposed how rapidly lifestyle factors move biometric data in both directions. That is information Week 1’s relative consistency could not have provided.
The experiment is now halfway through. Fifteen days of data. The second half begins with a new series low on the scales, a new series high on HRV, blood pressure back in the green, and the full face mask settings on the to-do list. Week 3 has its brief.
In summary, Week 2 highlighted both challenges and successes, contributing valuable insights into the health experiment week 2 review.
Week 2 covers Days 8–15, April 8–15 2026. All data sourced from published daily articles and confirmed device screenshots. Weight figures are Eufy primary readings. CPAP data from myAir app. Blood pressure from dedicated monitor. HRV from Hume Band. The 48-hour fast referenced in this review began Monday 13 April at dinner and concluded Wednesday 15 April at approximately 19:00.
— Week 2 of 4
