Explore Journal

A Larger Heart Isn’t Always an Athlete’s Heart

Heart enlargement can reflect healthy training adaptations or disease, so a larger heart does not automatically mean an athlete’s heart.

How Your Body Manages Fuel between Meals

Fuel use shifts gradually between meals as nutrient supply and hormone signals change, moving metabolism from storage toward use of body reserves.

Why Blood Calcium Levels Do Not Reveal Your Calcium Intake

Blood calcium can stay normal even when dietary intake is inadequate because hormonal responses help protect the circulating calcium pool.

What Train Low Means for Endurance Training?

Train-low strategies reduce carbohydrate availability for selected endurance sessions, but research has not established one consistently best approach.

What’s the Difference between Single Sets, Multiple Sets, and Pyramid Training?

Pyramid training changes load and repetition targets across multiple sets, while single-set and multi-set labels describe how many sets occur.

Which Is Worse: High-Fructose Corn Syrup or Other Sugars?

High-fructose corn syrup has not consistently caused greater weight gain than sucrose when calorie intake is comparable in controlled studies.

How to Adapt Your Workout to Outdoor Conditions

Outdoor exercise requires preparation for changing environmental demands, because the same workout can pose different risks across settings.

Why Losing Appetite with Age Can Become a Nutrition Problem

Appetite loss in older adults can push food intake below energy needs, increasing the risk of unintended weight loss even as calorie needs decline.

How Does a Nerve Signal Make Your Muscle Contract?

A motor nerve signal triggers electrical changes and calcium release in a muscle fiber, allowing the contractile proteins to generate movement.

The Many Jobs of Lipids in Your Body

Lipids do more than store energy, with different forms serving essential roles in the structures and signals that keep the body working.

Only a Few Hours to Recover? What Your Body Needs before the Next Workout

Recovery nutrition between closely spaced workouts should match the fuel and fluid losses from the last session to the demands of the next.

Why Training Plans Change over Time

Periodization organizes training demands across time, allowing a program’s emphasis to change as preparation and recovery needs evolve.