Jun 30, 2026Exercise Physiology

Once-Weekly HIIT May Trim Waist Size, With Limits

Can one weekly HIIT workout reduce central obesity? A trial found modest waist and fat-mass changes, but diet and lasting results still matter for health.

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Mar 30, 2026Physical Activity

HIIT Can Delay HRV Recovery. Does Training Time Matter?

HIIT delays HRV recovery more than moderate exercise. A small trial suggests training time may affect heart-rate recovery—but not yet in healthy HIIT users.

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Mar 30, 2026Cardiovascular Health

Morning Blood Pressure Surge: Does Exercise Timing Help?

Morning versus evening HIIT did not change the morning blood pressure surge in a small trial. Training type, chronotype, and diet may matter more.

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Mar 26, 2026Physical Activity

Aerobic Exercise for Carotid Plaque: What Trials Show

A 34-trial meta-analysis found aerobic exercise and HIIT reduced carotid wall thickness, while combined training did not show a significant effect.

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Mar 24, 2026Physical Activity

HIIT Helps Youth Fitness, Not Weight Loss, Study Finds

A 47-trial review finds HIIT can raise youth VO2max and lower blood pressure after 8 weeks—without reliably changing BMI or body fat.

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Mar 24, 2026Physical Activity

HIIT for Overweight Adults: What Dose Actually Works?

HIIT can raise cardiorespiratory fitness in overweight adults, but research still cannot name the best dose, interval length, or weekly plan.

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Mar 24, 2026Physical Activity

Sprint Intervals: Faster Workouts, Unsettled Heart Evidence

Sprint interval training can raise fitness, but a 2025 umbrella review found no proven edge over steady cardio—and much of the evidence rates low quality.

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Mar 24, 2026Physical Activity

HIIT vs. SIT vs. RST for VO2max: What the Rankings Mean

A 51-study network meta-analysis reportedly ranks RST first for athlete VO2max. Here's what the evidence supports—and what it cannot yet prove.

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Mar 24, 2026Physical Activity

Best Exercise for Fatty Liver? It Depends on the Outcome

Exercise improves fitness and waist size in MASLD, but the best workout for liver fat remains less certain. Here's what RCT evidence shows.

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Mar 24, 2026Physical Activity

HFpEF Exercise: Why HIIT Did Not Beat Moderate Training

In HFpEF, HIIT and moderate exercise both improved peak VO2 versus advice alone. The largest trial explains why harder intervals did not win.

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Mar 23, 2026Physical Activity

HIIT vs. Steady Cardio After 60: Is the Edge Worth It?

A 2026 meta-analysis finds HIIT improves VO2max slightly more than steady cardio after 60. See what the 1.17 mL/kg/min edge means.

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Mar 23, 2026Physical Activity

Online HIIT in Pregnancy: What an 8-Week Trial Found

An 8-week online HIIT trial preserved fitness markers and improved body composition in pregnancy. Here is what the data support—and who it does not cover.

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