Updated 1 week ago Science

What is medium-intensity activity and why it counts

Medium intensity activity duration measures how much time a user spends in moderate-intensity movement in a day. Learn how to interpret Sahha’s activity_medium_intensity_duration and use it in your product.

Medium intensity activity duration is the total time a user spends doing moderate-intensity activity during a day (e.g., brisk walking, steady cycling, active commuting). It’s measured in minutes. Higher values usually indicate more purposeful movement that meaningfully contributes to fitness and cardiometabolic health.

Key Takeaways

  • What it measures: time spent in moderate-intensity movement.
  • Why it matters: moderate activity is a core driver of long-term health and a common target in public health guidelines.
  • How to use it: power moderate-activity streaks, weekly targets, and progression plans.
  • Best practice: emphasize weekly trends and context; intensity classification varies by device.

Metric Spec

ItemValue
Sahha field nameactivity_medium_intensity_duration
What it representsTotal daily time spent in medium (moderate) intensity activity
UnitMinutes (minute)
Typical cadenceDaily (daily)
AggregationTotal (total)
Data requirementsSource-dependent; classification may use motion and heart rate when available
Best used forMVPA programs, weekly goals, fitness progression, activity driver context

What Is “Medium Intensity” Activity?

Medium (moderate) intensity activity generally means movement that:

  • raises heart rate and breathing noticeably
  • can be sustained for longer periods
  • still allows conversation (roughly “talk test” level)

Examples:

  • brisk walking
  • steady cycling
  • hiking on gentle grades
  • active commuting

Devices classify moderate intensity using proprietary models (accelerometer patterns, pace, and sometimes heart rate). Treat this as an estimate.

Why It Matters

Moderate-intensity movement is strongly associated with better cardiometabolic health outcomes. It’s also one of the easiest intensity bands for users to improve sustainably.

Product takeaway: medium intensity duration is ideal for “minimum effective dose” programs because it’s challenging enough to matter but accessible enough to maintain.

How Sahha Represents Medium Intensity Activity Duration

  • Biomarker: activity_medium_intensity_duration
  • Unit: minute
  • Periodicity: daily
  • Aggregation: total

Example biomarker object:

{
  "name": "activity_medium_intensity_duration",
  "value": 38,
  "unit": "minute",
  "periodicity": "daily",
  "aggregation": "total"
}

How to Interpret It

  • Higher than baseline: more purposeful movement that day.
  • Lower than baseline: less moderate activity; could still be an active day if low intensity is high.
  • Medium up + sedentary down: strong “healthier movement pattern” signal.

Use baseline framing and prefer weekly totals/trends.

How to Use It in Your Product

1) Weekly MVPA goals (user-friendly)

Examples:

  • “150 minutes this week” (or baseline-based targets)
  • “3 days with 20 minutes brisk walking”
  • “Add +10 minutes/week for 4 weeks”

2) Progression programs

  • start with 10–15 minutes/day
  • build gradually
  • celebrate week-over-week improvements

3) Explain score movement

  • “Your moderate-intensity time increased — that contributed to your Activity Score improvement.”

4) Pair with recovery signals

If moderate intensity rises while sleep debt rises or recovery drops:

  • recommend pacing
  • add recovery-focused content

Implementation Suggestions for your Products

  1. Trend weekly

    • Moderate minutes are more meaningful across a week than a single day.

  2. Design for classification variability

    • Different devices may classify intensity differently; avoid strict promises.

  3. Use simple rules

    • If medium intensity is trending up → celebrate progress
    • If medium intensity is up but sleep/recovery is down → suggest recovery pacing

FAQ

Is medium intensity the same as “exercise”?

Often, but not always. Moderate intensity can include active commuting and brisk walking, not only workouts.

Why is my moderate time low even though I exercised?

Device may not detect the activity type well (e.g., strength training), user didn’t wear/carry the device, or classification differs. Pair with active energy or workout records if available.

Why is the value missing (null)?

Some sources don’t provide intensity segmentation or permissions may be limited.

  • Low intensity duration: activity_low_intensity_duration
  • High intensity duration: activity_high_intensity_duration
  • Sedentary duration: activity_sedentary_duration
  • Active duration: active_duration
  • Active hours: active_hours

Notes

This content is educational and designed for product personalization and engagement. It is not medical advice.

References

Sahha

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