<h1 id="%E3%81%9D%E3%82%82%E3%81%9D%E3%82%82-healthkit-%E3%81%A8%E3%81%AF%EF%BC%9F" data-line="0" class="code-line">
<a class="header-anchor-link" href="#%E3%81%9D%E3%82%82%E3%81%9D%E3%82%82-healthkit-%E3%81%A8%E3%81%AF%EF%BC%9F" aria-hidden="true"></a> そもそも HealthKit とは？</h1>
<ul data-line="1" class="code-line">
<li data-line="1" class="code-line">iPhone／Apple Watch が集めた健康・フィットネス情報を一元管理するフレームワーク</li>
<li data-line="2" class="code-line">アプリは 読み取り／書き込み権限を個別にリクエストしてデータを扱う（例：心拍だけ読む、歩数を書くなど）</li>
</ul>
<p data-line="4" class="code-line"><span class="embed-block zenn-embedded zenn-embedded-card"><iframe id="zenn-embedded__c1fe47dbe94c7" src="https://embed.zenn.studio/card#zenn-embedded__c1fe47dbe94c7" data-content="https%3A%2F%2Fdeveloper.apple.com%2Fdocumentation%2Fhealthkit%2Fauthorizing-access-to-health-data%3Futm_source%3Dchatgpt.com" frameborder="0" scrolling="no" loading="lazy"></iframe></span><a href="https://developer.apple.com/documentation/healthkit/authorizing-access-to-health-data?utm_source=chatgpt.com" style="display:none" target="_blank" rel="nofollow noopener noreferrer">https://developer.apple.com/documentation/healthkit/authorizing-access-to-health-data?utm_source=chatgpt.com</a></p>
<ul data-line="6" class="code-line">
<li data-line="6" class="code-line">2024〜25年にかけて watchOS 11／iOS 18 でデータ型がさらに増え、メンタルヘルスや睡眠時無呼吸通知なども追加された。<br>
<a href="https://www.apple.com/newsroom/2024/09/watchos-11-is-available-today/?utm_source=chatgpt.com" target="_blank" rel="nofollow noopener noreferrer">https://www.apple.com/newsroom/2024/09/watchos-11-is-available-today/?utm_source=chatgpt.com</a>
</li>
</ul>
<h1 id="%E6%B3%A8%E7%9B%AE%E3%82%AB%E3%83%86%E3%82%B4%E3%83%AA%E5%88%A5%E3%83%BB%E5%8F%96%E5%BE%97%E3%81%A7%E3%81%8D%E3%82%8B%E4%B8%BB%E8%A6%81%E3%83%87%E3%83%BC%E3%82%BF" data-line="9" class="code-line">
<a class="header-anchor-link" href="#%E6%B3%A8%E7%9B%AE%E3%82%AB%E3%83%86%E3%82%B4%E3%83%AA%E5%88%A5%E3%83%BB%E5%8F%96%E5%BE%97%E3%81%A7%E3%81%8D%E3%82%8B%E4%B8%BB%E8%A6%81%E3%83%87%E3%83%BC%E3%82%BF" aria-hidden="true"></a> 注目カテゴリ別・取得できる主要データ</h1>
<table data-line="10" class="code-line">
<thead data-line="10" class="code-line">
<tr data-line="10" class="code-line">
<th>カテゴリ</th>
<th>主なデータ型 &amp; 説明</th>
<th>取得タイミング</th>
</tr>
</thead>
<tbody data-line="12" class="code-line">
<tr data-line="12" class="code-line">
<td><strong>バイタル</strong></td>
<td>- <strong>心拍数</strong> <code>heartRate</code>（日常計測・ワークアウト中は高頻度）<br> - <strong>心拍変動</strong> <code>heartRateVariabilitySDNN</code>（HRV；ストレスや疲労の指標）<br> - <strong>血中酸素</strong> <code>oxygenSaturation</code><br> - <strong>呼吸数</strong> <code>respiratoryRate</code><br> - <strong>手首温度</strong> <code>wristTemperature</code>
</td>
<td>心拍はほぼリアルタイム。HRVは主に安静時に数回／日。その他は定期測定。(<a href="https://www.apple.com/newsroom/2024/06/watchos-11-brings-powerful-health-and-fitness-insights/?utm_source=chatgpt.com" title="watchOS 11 brings powerful health and fitness insights - Apple" target="_blank" rel="nofollow noopener noreferrer">apple.com</a>, <a href="https://developer.apple.com/documentation/healthkit/hkquantitytypeidentifier/heartratevariabilitysdnn?utm_source=chatgpt.com" title="heartRateVariabilitySDNN | Apple Developer Documentation" target="_blank" rel="nofollow noopener noreferrer">developer.apple.com</a>)</td>
</tr>
<tr data-line="13" class="code-line">
<td><strong>睡眠</strong></td>
<td>- <strong>SleepAnalysis</strong>（就床〜起床の区間）<br> - <strong>睡眠ステージ</strong>（レム／コア／深い）</td>
<td>
<strong>就寝後はバックグラウンド計測</strong>。起床してiPhoneがロック解除された後にまとめて同期されることが多い。(<a href="https://www.apple.com/newsroom/2024/06/watchos-11-brings-powerful-health-and-fitness-insights/?utm_source=chatgpt.com" title="watchOS 11 brings powerful health and fitness insights - Apple" target="_blank" rel="nofollow noopener noreferrer">apple.com</a>, <a href="https://www.apple.com/newsroom/2024/09/watchos-11-is-available-today/?utm_source=chatgpt.com" title="watchOS 11 is available today - Apple" target="_blank" rel="nofollow noopener noreferrer">apple.com</a>)</td>
</tr>
<tr data-line="14" class="code-line">
<td><strong>ストレス／メンタル</strong></td>
<td>- <strong>HRVの低下</strong>で身体ストレス傾向を推定（アプリ独自アルゴリズム）<br> - <strong>Mindful Session</strong>（呼吸・瞑想）<br> - <strong>State of Mind</strong>（気分・PHQ-9／GAD-7自己記録）</td>
<td>HRVはバックグラウンド取得。Mindful／State of Mindはユーザー操作時に記録。(<a href="https://support.apple.com/guide/iphone/log-your-state-of-mind-iph6a6decb13/ios?utm_source=chatgpt.com" title="Log your state of mind in Health on iPhone - Apple Support" target="_blank" rel="nofollow noopener noreferrer">support.apple.com</a>, <a href="https://www.apple.com/newsroom/2023/06/apple-provides-powerful-insights-into-new-areas-of-health/?utm_source=chatgpt.com" title="Apple provides powerful insights into new areas of health" target="_blank" rel="nofollow noopener noreferrer">apple.com</a>, <a href="https://www.yahoo.com/tech/heart-rate-variability-hrv-apple-131512991.html?utm_source=chatgpt.com" title="What Is Heart Rate Variability (HRV) on Apple Watch, and Why Does ..." target="_blank" rel="nofollow noopener noreferrer">yahoo.com</a>)</td>
</tr>
<tr data-line="15" class="code-line">
<td><strong>運動量（アクティビティ）</strong></td>
<td>- <strong>歩数</strong> <code>stepCount</code>、<strong>歩行距離</strong>、<strong>上った階数</strong><br> - <strong>消費エネルギー</strong>（アクティブ／安静）<br> - <strong>エクササイズ時間</strong>、<strong>スタンド達成</strong><br> - <strong>HKWorkout</strong>（種目、時間、距離、カロリーなど）</td>
<td>Apple Watch が随時更新。ObserverQueryで<strong>ほぼリアルタイム監視</strong>可能。(<a href="https://support.apple.com/en-gb/108779?utm_source=chatgpt.com" title="Manage Health data on your iPhone, iPad or Apple Watch" target="_blank" rel="nofollow noopener noreferrer">support.apple.com</a>, <a href="https://support.apple.com/en-in/104997?utm_source=chatgpt.com" title="Use the Health app on your iPhone or iPad - Apple Support (IN)" target="_blank" rel="nofollow noopener noreferrer">support.apple.com</a>)</td>
</tr>
<tr data-line="16" class="code-line">
<td><strong>異常通知</strong></td>
<td>- <strong>高／低心拍イベント</strong><br> - <strong>不規則心拍リズム通知</strong>（AFib 兆候）<br> - <strong>睡眠時無呼吸通知</strong>（watchOS 11 新機能）</td>
<td>イベント発生時にHealthKitへ<code>HKCategorySample</code>として記録。睡眠時無呼吸は夜間検出後に登録。(<a href="https://www.apple.com/newsroom/2024/09/watchos-11-is-available-today/?utm_source=chatgpt.com" title="watchOS 11 is available today - Apple" target="_blank" rel="nofollow noopener noreferrer">apple.com</a>, <a href="https://support.apple.com/en-us/121163?utm_source=chatgpt.com" title="About watchOS 11 Updates - Apple Support" target="_blank" rel="nofollow noopener noreferrer">support.apple.com</a>)</td>
</tr>
</tbody>
</table>
<p data-line="29" class="code-line">ECG（心電図）データ <strong>HKElectrocardiogram</strong> も読み取り専用で取得可能。日本はwatchOS 7.6以降で正式対応済。<br style="display:none">
<span class="embed-block zenn-embedded zenn-embedded-card"><iframe id="zenn-embedded__65779d00b2cf7" src="https://embed.zenn.studio/card#zenn-embedded__65779d00b2cf7" data-content="https%3A%2F%2Fsupport.apple.com%2Fen-us%2F118391%3Futm_source%3Dchatgpt.com" frameborder="0" scrolling="no" loading="lazy"></iframe></span><a href="https://support.apple.com/en-us/118391?utm_source=chatgpt.com" style="display:none" target="_blank" rel="nofollow noopener noreferrer">https://support.apple.com/en-us/118391?utm_source=chatgpt.com</a></p>
<p data-line="32" class="code-line">薬管理・生理周期・視力・聴覚など周辺ヘルスデータも拡充中。<br style="display:none">
<span class="embed-block zenn-embedded zenn-embedded-card"><iframe id="zenn-embedded__2d245b135ba72" src="https://embed.zenn.studio/card#zenn-embedded__2d245b135ba72" data-content="https%3A%2F%2Fsupport.apple.com%2Fja-jp%2Fguide%2Fiphone%2Fiph811670c81%2Fios" frameborder="0" scrolling="no" loading="lazy"></iframe></span><a href="https://support.apple.com/ja-jp/guide/iphone/iph811670c81/ios" style="display:none" target="_blank" rel="nofollow noopener noreferrer">https://support.apple.com/ja-jp/guide/iphone/iph811670c81/ios</a><br style="display:none">
<span class="embed-block zenn-embedded zenn-embedded-card"><iframe id="zenn-embedded__de55512c0d663" src="https://embed.zenn.studio/card#zenn-embedded__de55512c0d663" data-content="https%3A%2F%2Fsupport.apple.com%2Fen-us%2F120356%3Futm_source%3Dchatgpt.com" frameborder="0" scrolling="no" loading="lazy"></iframe></span><a href="https://support.apple.com/en-us/120356?utm_source=chatgpt.com" style="display:none" target="_blank" rel="nofollow noopener noreferrer">https://support.apple.com/en-us/120356?utm_source=chatgpt.com</a></p>
<h1 id="%E9%96%8B%E7%99%BA%E3%81%A7%E6%8A%BC%E3%81%95%E3%81%88%E3%82%8B%E3%83%AA%E3%82%A2%E3%83%AB%E3%82%BF%E3%82%A4%E3%83%A0%E6%80%A7%E3%81%AE%E5%8B%98%E6%89%80" data-line="36" class="code-line">
<a class="header-anchor-link" href="#%E9%96%8B%E7%99%BA%E3%81%A7%E6%8A%BC%E3%81%95%E3%81%88%E3%82%8B%E3%83%AA%E3%82%A2%E3%83%AB%E3%82%BF%E3%82%A4%E3%83%A0%E6%80%A7%E3%81%AE%E5%8B%98%E6%89%80" aria-hidden="true"></a> 開発で押さえるリアルタイム性の勘所</h1>
<h2 id="%E5%BF%83%E6%8B%8D%E6%95%B0" data-line="37" class="code-line">
<a class="header-anchor-link" href="#%E5%BF%83%E6%8B%8D%E6%95%B0" aria-hidden="true"></a> 心拍数</h2>
<p data-line="38" class="code-line">フォアグラウンドで HKAnchoredObjectQuery を継続実行すれば数秒〜十数秒遅延で取得可能。</p>
<h2 id="%E7%9D%A1%E7%9C%A0%E3%83%87%E3%83%BC%E3%82%BF" data-line="40" class="code-line">
<a class="header-anchor-link" href="#%E7%9D%A1%E7%9C%A0%E3%83%87%E3%83%BC%E3%82%BF" aria-hidden="true"></a> 睡眠データ</h2>
<p data-line="41" class="code-line">起床直後にまとめて書き込まれるため、即時通知は期待しない設計が無難。</p>
<h2 id="observerquery-%2B-backgrounddelivery" data-line="43" class="code-line">
<a class="header-anchor-link" href="#observerquery-%2B-backgrounddelivery" aria-hidden="true"></a> ObserverQuery + BackgroundDelivery</h2>
<p data-line="44" class="code-line">歩数・カロリー・心拍イベントなど、増分があればバックグラウンドでも呼び出し可能（ただし低電力時や省電力設定で遅延の可能性あり）</p>
<h1 id="%E3%81%BE%E3%81%A8%E3%82%81-%26-%E6%AC%A1%E3%81%AE%E4%B8%80%E6%AD%A9" data-line="46" class="code-line">
<a class="header-anchor-link" href="#%E3%81%BE%E3%81%A8%E3%82%81-%26-%E6%AC%A1%E3%81%AE%E4%B8%80%E6%AD%A9" aria-hidden="true"></a> まとめ &amp; 次の一歩</h1>
<ul data-line="47" class="code-line">
<li data-line="47" class="code-line">睡眠・心拍・ストレス（HRV）・運動量はApple WatchとHealthKitで網羅可能。</li>
<li data-line="48" class="code-line">リアルタイムで欲しいのは心拍／アクティビティ系。睡眠・メンタルはバッチ更新前提で。</li>
<li data-line="49" class="code-line">**MCP（Model Context Protocol）**と組み合わせれば、いろいろ楽しいことができそうですね！</li>
</ul>


Apple HealthKit 2025 まとめ〜Apple Watch から取れるデータとリアルタイム性をざっくり整理〜

注目カテゴリ別・取得できる主要データ

開発で押さえるリアルタイム性の勘所

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