diff --git a/app/src/main/java/com/example/medilightv2android/ble/PiezoPacketCollector.kt b/app/src/main/java/com/example/medilightv2android/ble/PiezoPacketCollector.kt
index d713b32..1f3fe8d 100644
--- a/app/src/main/java/com/example/medilightv2android/ble/PiezoPacketCollector.kt
+++ b/app/src/main/java/com/example/medilightv2android/ble/PiezoPacketCollector.kt
@@ -43,6 +43,9 @@ class PiezoPacketCollector {
     // Callbacks
     var onComplete: ((PiezoEchoResult) -> Unit)? = null
     var onMultiChannelComplete: ((List<PiezoChannelData>) -> Unit)? = null
+    /** true 면 다음 onMultiChannelComplete 1회 skip (자동 reset).
+     *  posture polling 으로 mtb 보낼 때 측정 callback 가 spurious fire 되는 거 차단용. */
+    var skipNextComplete: Boolean = false
     var onLog: ((String) -> Unit)? = null
 
     private var recursionDepth = 0
@@ -228,7 +231,12 @@ class PiezoPacketCollector {
                 else -> {
                     val validChannels = channelResults.filterNotNull()
                     onLog?.invoke("raa: session=$currentSetSession complete — ${validChannels.size} channels")
-                    onMultiChannelComplete?.invoke(validChannels)
+                    if (skipNextComplete) {
+                        skipNextComplete = false
+                        onLog?.invoke("raa: skip onComplete (posture poll)")
+                    } else {
+                        onMultiChannelComplete?.invoke(validChannels)
+                    }
                 }
             }
             // 다음 set을 위해 reset (isMultiChannel/onComplete 등 유지)
diff --git a/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt b/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt
index c54118c..b3985c5 100644
--- a/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt
+++ b/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt
@@ -591,7 +591,10 @@ fun PiezoMonitoringView(appState: AppState) {
         }
     }
 
-    // IMU polling + 자세 분류 (Phase 1) — 5초 주기로 msp 명령 → rsp: 응답 받아 분류.
+    // IMU polling + 자세 분류 (Phase 1) — 10초 주기로 mtb 명령 → rim: 응답 받아 분류.
+    // msp 가 펌웨어에서 rsp: 응답 안 보내는 듯해 mtb (alignment) 로 우회.
+    // mtb 는 piezo measurement 도 트리거하므로 piezoCollector.skipNextComplete 로
+    // user 의 측정 callback 가 spurious fire 되는 거 차단.
     LaunchedEffect(isConnected, isDemoMode) {
         Log.d("ImuDbg", "LaunchedEffect start isConnected=$isConnected isDemoMode=$isDemoMode")
         if (isDemoMode) {
@@ -609,13 +612,18 @@ fun PiezoMonitoringView(appState: AppState) {
             Log.d("ImuDbg", "imuCollector log: $msg")
         }
         while (isActive) {
-            if (isConnected) {
-                Log.d("ImuDbg", "→ sendImuQuery (msp)")
-                bleManager.sendImuQuery()
+            if (isConnected && !isMeasuring && !isAutoMeasuring && !isSpotInProgress) {
+                Log.d("ImuDbg", "→ sendMtb (posture poll)")
+                bleManager.piezoCollector.skipNextComplete = true
+                val sent = bleManager.sendMtb()
+                if (!sent) {
+                    bleManager.piezoCollector.skipNextComplete = false   // throttled, no response coming
+                    Log.d("ImuDbg", "mtb throttled — skip this cycle")
+                }
             } else {
-                Log.d("ImuDbg", "skip (not connected)")
+                Log.d("ImuDbg", "skip (connected=$isConnected measuring=$isMeasuring auto=$isAutoMeasuring spot=$isSpotInProgress)")
             }
-            kotlinx.coroutines.delay(5000)
+            kotlinx.coroutines.delay(10000)
         }
     }