HRV4Training's Substack

Week 46: Heart Rate vs Heart Rate Variability

And a follow-up on metabolic flexibility

Nov 12 • 

Marco Altini

3

1

1

Week 45: Was It the Type of Training, or Was It the Circumstances?

What HRV guided-training really teaches us.

Nov 5 • 

Marco Altini

9

1

October 2025

Week 44: The Heart–Brain Connection and What It Means for Heart Rate Variability (HRV)

Hi there 👋

Oct 30 • 

Marco Altini

10

1

Week 43: The Latest on HRV-Guided Training

Hi there 👋

Oct 21 • 

Marco Altini

10

Week 42: Coospo HW9 for Heart Rate Variability (HRV) Analysis

Another affordable option.

Oct 14 • 

Marco Altini

7

7

1

Week 41: Ambassador Program 2026

Apply Now

Oct 7 • 

Marco Altini

5

1

Week 40: Variability in Variability

An important signal to consider

Oct 3 • 

Marco Altini

5

1

September 2025

Week 39: Breathing 🫁

Pranayama Protocols: Yogic Respiration (Resonant Frequency) and Chatushkona (Box Breathing)

Sep 25 • 

Marco Altini

7

2

Week 38: The Data-Driven Path to Aging Well

Hi there 👋

Sep 17 • 

Marco Altini

4

5

Week 37: Heart Rate Variability (HRV) and Psychological Stress

All stress matters

Sep 10 • 

Marco Altini

9

4

2

Week 36: On The Accuracy of Wearables for HRV

Some are good, some are not so good, it seems

Sep 2 • 

Marco Altini

4

4

August 2025

Week 35: (Very) Long Term Trends in HRV

Seasonality and Meaning

Aug 25 • 

Marco Altini

9