diff --git a/src/lib/oura/__tests__/client.test.ts b/src/lib/oura/__tests__/client.test.ts
index db6260cb2..d1a87cbf0 100644
--- a/src/lib/oura/__tests__/client.test.ts
+++ b/src/lib/oura/__tests__/client.test.ts
@@ -4,19 +4,24 @@ import {
   OURA_OAUTH_SCOPE,
   exchangeCode,
   fetchReadiness,
+  fetchVo2Max,
   getAuthorizationUrl,
   getOuraCredentials,
   mapDailyActivity,
   mapDailySleep,
   mapDailySpo2,
+  mapDailyStress,
   mapReadiness,
   mapSleep,
+  mapVo2Max,
   refreshAccessToken,
   type OuraDailyActivity,
   type OuraDailySleep,
   type OuraDailySpo2,
+  type OuraDailyStress,
   type OuraReadiness,
   type OuraSleep,
+  type OuraVo2Max,
 } from "../client";
 import { OuraApiError } from "../response-classifier";
 
@@ -309,6 +314,85 @@ describe("mapDailySpo2", () => {
   });
 });
 
+describe("fetchVo2Max", () => {
+  it("reads the camel-cased vO2_max collection path", async () => {
+    const fetchMock = installFetchMock([
+      {
+        status: 200,
+        body: {
+          data: [{ id: "1", day: "2026-06-10", vo2_max: 47.3 }],
+          next_token: null,
+        },
+      },
+    ]);
+    const r = await fetchVo2Max("tok", {
+      startDate: "2026-06-01",
+      endDate: "2026-06-10",
+    });
+    expect(r).toHaveLength(1);
+    const [url] = fetchMock.mock.calls[0]!;
+    expect(url).toContain("/v2/usercollection/vO2_max");
+  });
+});
+
+describe("mapVo2Max", () => {
+  it("maps vo2_max -> VO2_MAX (mL/(kg·min))", () => {
+    const v: OuraVo2Max = { id: "1", day: "2026-06-10", vo2_max: 47.3 };
+    const mapped = mapVo2Max(v);
+    expect(mapped).toHaveLength(1);
+    expect(mapped[0]).toMatchObject({
+      type: "VO2_MAX",
+      value: 47.3,
+      unit: "mL/(kg·min)",
+      fieldTag: "vo2_max",
+    });
+  });
+  it("skips a record with no positive value", () => {
+    expect(mapVo2Max({ id: "1", day: "2026-06-10", vo2_max: 0 })).toEqual([]);
+    expect(mapVo2Max({ id: "1", day: "2026-06-10", vo2_max: null })).toEqual(
+      [],
+    );
+  });
+});
+
+describe("mapDailyStress", () => {
+  it("derives a 0-100 STRESS_SCORE from the high-stress share of charged time", () => {
+    const s: OuraDailyStress = {
+      id: "1",
+      day: "2026-06-10",
+      stress_high: 90,
+      recovery_high: 30,
+    };
+    const mapped = mapDailyStress(s);
+    expect(mapped).toHaveLength(1);
+    // 90 / (90 + 30) = 75 %.
+    expect(mapped[0]).toMatchObject({
+      type: "STRESS_SCORE",
+      value: 75,
+      unit: "score",
+      fieldTag: "stress",
+    });
+  });
+  it("treats a missing recovery field as zero recovery", () => {
+    const mapped = mapDailyStress({
+      id: "1",
+      day: "2026-06-10",
+      stress_high: 60,
+    });
+    expect(mapped[0]?.value).toBe(100);
+  });
+  it("skips a day with no charged minutes (no signal)", () => {
+    expect(
+      mapDailyStress({
+        id: "1",
+        day: "2026-06-10",
+        stress_high: 0,
+        recovery_high: 0,
+      }),
+    ).toEqual([]);
+  });
+});
+
 describe("OURA_OAUTH_SCOPE", () => {
   it("requests daily + personal", () => {
     expect(OURA_OAUTH_SCOPE).toBe("daily personal");
diff --git a/src/lib/oura/__tests__/sync.test.ts b/src/lib/oura/__tests__/sync.test.ts
index 5aad8bfdb..c345fdcef 100644
--- a/src/lib/oura/__tests__/sync.test.ts
+++ b/src/lib/oura/__tests__/sync.test.ts
@@ -9,6 +9,8 @@ const {
   fetchActivityMock,
   fetchDailySleepMock,
   fetchSpo2Mock,
+  fetchStressMock,
+  fetchVo2MaxMock,
   refreshMock,
   upsertMock,
   recordSuccessMock,
@@ -24,6 +26,8 @@ const {
   fetchActivityMock: vi.fn(),
   fetchDailySleepMock: vi.fn(),
   fetchSpo2Mock: vi.fn(),
+  fetchStressMock: vi.fn(),
+  fetchVo2MaxMock: vi.fn(),
   refreshMock: vi.fn(),
   upsertMock: vi.fn(),
   recordSuccessMock: vi.fn(),
@@ -67,6 +71,8 @@ vi.mock("../client", async (importOriginal) => {
     fetchDailyActivity: fetchActivityMock,
     fetchDailySleep: fetchDailySleepMock,
     fetchDailySpo2: fetchSpo2Mock,
+    fetchDailyStress: fetchStressMock,
+    fetchVo2Max: fetchVo2MaxMock,
     refreshAccessToken: refreshMock,
   };
 });
@@ -87,6 +93,8 @@ beforeEach(() => {
   fetchActivityMock.mockReset().mockResolvedValue([]);
   fetchDailySleepMock.mockReset().mockResolvedValue([]);
   fetchSpo2Mock.mockReset().mockResolvedValue([]);
+  fetchStressMock.mockReset().mockResolvedValue([]);
+  fetchVo2MaxMock.mockReset().mockResolvedValue([]);
   refreshMock.mockReset();
   upsertMock.mockReset().mockResolvedValue({});
   recordSuccessMock.mockReset().mockResolvedValue(undefined);
@@ -210,6 +218,32 @@ describe("syncUserOura", () => {
     });
   });
 
+  it("writes VO2_MAX and STRESS_SCORE from the new collections", async () => {
+    getConnMock.mockResolvedValue(CONN);
+    fetchVo2MaxMock.mockResolvedValue([
+      { id: "v", day: "2026-06-10", vo2_max: 47.3 },
+    ]);
+    fetchStressMock.mockResolvedValue([
+      { id: "s", day: "2026-06-10", stress_high: 90, recovery_high: 30 },
+    ]);
+    await syncUserOura("u1");
+    const written = upsertMock.mock.calls.map((c) => ({
+      type: c[0].where.userId_type_source_externalId.type,
+      externalId: c[0].where.userId_type_source_externalId.externalId,
+      value: c[0].create.value,
+    }));
+    expect(written).toContainEqual({
+      type: "VO2_MAX",
+      externalId: "vo2max:2026-06-10:vo2_max",
+      value: 47.3,
+    });
+    expect(written).toContainEqual({
+      type: "STRESS_SCORE",
+      externalId: "stress:2026-06-10:stress",
+      value: 75,
+    });
+  });
+
   it("does NOT refresh on a 403 (not an expiry case)", async () => {
     getConnMock.mockResolvedValue(CONN);
     fetchReadinessMock.mockRejectedValue(
diff --git a/src/lib/oura/client.ts b/src/lib/oura/client.ts
index 1ae94a6e5..6dece968c 100644
--- a/src/lib/oura/client.ts
+++ b/src/lib/oura/client.ts
@@ -218,6 +218,32 @@ export interface OuraDailySpo2 {
   spo2_percentage?: { average?: number | null } | null;
 }
 
+/**
+ * Oura `daily_stress` — minutes spent in high stress vs. high recovery for the
+ * day (mutually exclusive). The collection carries no headline 0–100 score; the
+ * actionable scalars are the two durations plus a categorical `day_summary`
+ * (`restored` | `normal` | `stressed`), which has no enum and is dropped.
+ */
+export interface OuraDailyStress {
+  id: string;
+  day: string;
+  timestamp?: string;
+  /** Minutes spent in high stress. */
+  stress_high?: number | null;
+  /** Minutes spent in high recovery. */
+  recovery_high?: number | null;
+  /** `restored` | `normal` | `stressed` — categorical; no enum, not mapped. */
+  day_summary?: string | null;
+}
+
+/** Oura `vO2_max` — the dedicated cardio-fitness collection, mL/(kg·min). */
+export interface OuraVo2Max {
+  id: string;
+  day: string;
+  timestamp?: string;
+  vo2_max?: number | null;
+}
+
 export interface OuraDailyActivity {
   id: string;
   day: string;
@@ -348,6 +374,32 @@ export function fetchDailySpo2(
   );
 }
 
+export function fetchDailyStress(
+  accessToken: string,
+  query: DateRangeQuery,
+): Promise<OuraDailyStress[]> {
+  return fetchCollection<OuraDailyStress>(
+    "/v2/usercollection/daily_stress",
+    accessToken,
+    "fetchDailyStress",
+    query,
+  );
+}
+
+export function fetchVo2Max(
+  accessToken: string,
+  query: DateRangeQuery,
+): Promise<OuraVo2Max[]> {
+  // Oura camel-cases this path segment (`vO2_max`); every other collection is
+  // snake_case. Matched verbatim against cloud.ouraring.com/v2/docs.
+  return fetchCollection<OuraVo2Max>(
+    "/v2/usercollection/vO2_max",
+    accessToken,
+    "fetchVo2Max",
+    query,
+  );
+}
+
 // ─── Field → Measurement mapping ───────────────────────────────
 
 const SEC_TO_MIN = 1 / 60;
@@ -653,3 +705,51 @@ export function mapDailyActivity(a: OuraDailyActivity): MappedMeasurement[] {
   }
   return out;
 }
+
+/**
+ * Map one Oura `vO2_max` record: the dedicated cardio-fitness collection →
+ * `VO2_MAX` (mL/(kg·min), the canonical DB unit — no conversion). Skips a
+ * record with no positive value.
+ */
+export function mapVo2Max(v: OuraVo2Max): MappedMeasurement[] {
+  if (typeof v.vo2_max !== "number" || v.vo2_max <= 0) return [];
+  const measuredAt = dayAnchor(v.day, v.timestamp);
+  if (!measuredAt) return [];
+  return [
+    {
+      type: "VO2_MAX",
+      value: round2(v.vo2_max),
+      unit: "mL/(kg·min)",
+      measuredAt,
+      fieldTag: "vo2_max",
+    },
+  ];
+}
+
+/**
+ * Map one Oura `daily_stress` record → `STRESS_SCORE`. Oura exposes no headline
+ * 0–100 stress number — only minutes spent in high stress vs. high recovery.
+ * We derive a bounded 0–100 score from the share of the day's "charged" time
+ * (stress + recovery minutes) spent in high stress, which keeps the canonical
+ * `STRESS_SCORE` contract (0–100, unit "score", higher = more stress) and lines
+ * up with how RECOVERY_SCORE is stored. A day with no charged minutes carries
+ * no signal and is skipped; the categorical `day_summary` has no enum and is
+ * dropped.
+ */
+export function mapDailyStress(s: OuraDailyStress): MappedMeasurement[] {
+  const stress = typeof s.stress_high === "number" ? s.stress_high : 0;
+  const recovery = typeof s.recovery_high === "number" ? s.recovery_high : 0;
+  const charged = stress + recovery;
+  if (charged <= 0) return [];
+  const measuredAt = dayAnchor(s.day, s.timestamp);
+  if (!measuredAt) return [];
+  return [
+    {
+      type: "STRESS_SCORE",
+      value: Math.round((stress / charged) * 100),
+      unit: "score",
+      measuredAt,
+      fieldTag: "stress",
+    },
+  ];
+}
diff --git a/src/lib/oura/sync.ts b/src/lib/oura/sync.ts
index 15ec2cf9d..3b95d8c5c 100644
--- a/src/lib/oura/sync.ts
+++ b/src/lib/oura/sync.ts
@@ -5,8 +5,9 @@
  * (real per-segment hypnogram timeline when present, else per-stage totals;
  * efficiency, HRV, RHR, respiratory rate), daily activity (steps, active
  * energy, equivalent walking distance), the daily Sleep Score (→ SLEEP_SCORE),
- * and daily SpO2 (→ OXYGEN_SATURATION) for one connected user, mapping each into
- * `Measurement` rows tagged `source = OURA`.
+ * daily SpO2 (→ OXYGEN_SATURATION), daily stress (→ STRESS_SCORE), and the
+ * dedicated vO2_max collection (→ VO2_MAX) for one connected user, mapping each
+ * into `Measurement` rows tagged `source = OURA`.
  *
  * Token model: Oura uses refresh tokens. The merged schema has no expiry
  * column, so the sync refreshes REACTIVELY — the first read that 401s triggers
@@ -40,13 +41,17 @@ import {
   fetchDailyActivity,
   fetchDailySleep,
   fetchDailySpo2,
+  fetchDailyStress,
   fetchReadiness,
   fetchSleep,
+  fetchVo2Max,
   mapDailyActivity,
   mapDailySleep,
   mapDailySpo2,
+  mapDailyStress,
   mapReadiness,
   mapSleep,
+  mapVo2Max,
   refreshAccessToken,
   type MappedMeasurement,
 } from "./client";
@@ -114,15 +119,16 @@ async function fetchAll(
   const query = { startDate: ymd(start), endDate: ymd(now) };
 
   const run = async (token: string): Promise<OuraMeasurementUpsert[]> => {
-    const [readiness, sleeps, activities, dailySleep, spo2] = await Promise.all(
-      [
+    const [readiness, sleeps, activities, dailySleep, spo2, stress, vo2max] =
+      await Promise.all([
         fetchReadiness(token, query),
         fetchSleep(token, query),
         fetchDailyActivity(token, query),
         fetchDailySleep(token, query),
         fetchDailySpo2(token, query),
-      ],
-    );
+        fetchDailyStress(token, query),
+        fetchVo2Max(token, query),
+      ]);
     const out: OuraMeasurementUpsert[] = [];
     for (const r of readiness)
       out.push(...toUpsert(mapReadiness(r), "readiness"));
@@ -132,6 +138,8 @@ async function fetchAll(
     for (const d of dailySleep)
       out.push(...toUpsert(mapDailySleep(d), "daily_sleep"));
     for (const s of spo2) out.push(...toUpsert(mapDailySpo2(s), "spo2"));
+    for (const s of stress) out.push(...toUpsert(mapDailyStress(s), "stress"));
+    for (const v of vo2max) out.push(...toUpsert(mapVo2Max(v), "vo2max"));
     return out;
   };