PRIMARYMD · INSIGHTS

Health Library

Thoughtful perspectives on health, medicine, and the decisions in between.

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A HUMAN PERSPECTIVE

From Our Care Team

FOLLOW YOUR CURIOSITY

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Medical terms, made clear ↗
Man in a tank top stretching his hamstring on a railing along the Hudson River, with the city skyline behind him.

Care Team Perspective

An exercise physiologist weighs the evidence on massage guns, cold plunges, compression and red light therapy, and explains what matters most for recovery.

Heart rhythm tracing on a navy grid with arrows marking the slightly different time between each heartbeat.

Care Team Perspective

An exercise physiologist explains heart rate variability (HRV): what it measures, why yours changes, and how to use your own baseline to guide training.

A person checks heart rate on a smartwatch while exercising on a treadmill

Care Team Perspective

Your watch sets heart rate zones from age-based estimates. See how lab VO₂ max testing measures your own thresholds and makes your training zones personal.

Membrane potential (mV)

Care Team Perspective

Electrolytes seem to be the current marketed “health and fitness” item to ingest.

An exercise physiologist guides an adult through a standing cable exercise.

Care Team Perspective

Heather Milton explores how exercise selection, intensity, recovery, and progression can be tailored to your goals, training history, and ability.

A physician and an adult review information together on a tablet.

Care Team Perspective

RSV, COVID-19, and influenza—what the latest evidence shows, what I recommend, and how your PrimaryMD team can help determine what applies to you

Guide & Explainer

PrimaryMD explains the Judgment Gap in longevity medicine: why more health data is not enough, and why evidence-based longevity care requires physician judgment, clean incentives, and decision-linked testing.

Guide & Explainer

Learn how to start exercising safely with a family history of heart disease, including symptoms to watch, testing to discuss, and how to build gradually.

Guide & Explainer

Learn what a long-term primary care strategy should include, from continuity and diagnostics to specialist coordination and proactive follow-through.

Guide & Explainer

PrimaryMD explains how busy adults can protect energy, sleep, metabolic health, and cardiovascular risk while balancing work and family demands.

Guide & Explainer

Annual checkups can miss changing health risks. Learn why trends, follow-up, and ongoing physician access matter between yearly primary care visits.

Guide & Explainer

Some popular health habits can increase cardiovascular risk. Learn when endurance training, diets, hormones, cold exposure, and supplements need medical context.

ABOUT THIS LIBRARY

Good questions.
More perspective.

Explore original perspectives from our care team alongside guides from the PrimaryMD Editorial Team. Every article identifies its author. Completed clinical reviews are credited separately.

This library is open to everyone. Its content is educational and does not replace individual medical advice.

Meet our contributors

Meet the people behind our articles and clinical reviews. Authorship and completed reviews are credited separately on each article.

Heather Milton, MS

Lead Exercise Physiologist

Other clinician

Michael Billington, MD

Chief Science Officer

Physician

PrimaryMD Editorial Team

Editorial team · Nonclinical authorship

Editorial team

Sarah A.O. Isenberg, NBC-HWC, CPT, PN1-NC

National Board Certified Health & Wellness Coach

Health coach

Sukhjit Takhar, MD

Co-Founder & Chief Medical Officer

Physician

WHEN YOU WANT TO GO DEEPER

A conversation about your health.