Health, Longevity & Biohacking

Norwegian 4x4 Protocol Increased VO2 Max 10 Percent in Eight Weeks for Postmenopausal Women

Name: Norwegian 4x4 Protocol Increased VO2 Max 10 Percent in Eight Weeks for Postmenopausal Women
Uploaded: 2026-06-29T05:02:00+00:00
Description: Dr. Estima cited research showing postmenopausal women achieved a 10% VO2 max improvement in just eight weeks using high-intensity interval training, with 69% mitochondrial efficiency gains compared to 49% in younger women. The study suggests older women have more upside potential for fitness gains than commonly believed, directly contradicting narratives about declining capacity with age.

Diary of a CEO · Women’s Fitness Expert: What You NEED To Know About Dieting & Exercise | Dr. Stephanie Estima · June 29, 2026

Diary of a CEO

Women’s Fitness Expert: What You NEED To Know About Dieting & Exercise | Dr. Stephanie Estima

"They looked at women. The average age of the women were 58. So they were, a lot of them were in like postmenopausal, let's say, and they put them on a sprinting protocol. What they found was that in a period of 8 weeks, they were able to increase their VO2 max by 10%. The older cohort had mitochondrial efficiency improvements of 69% whereas the younger cohort, their mitochondrial gains were 49%."

Dr. Estima cited research showing postmenopausal women achieved a 10% VO2 max improvement in just eight weeks using high-intensity interval training, with 69% mitochondrial efficiency gains compared to 49% in younger women. The study suggests older women have more upside potential for fitness gains than commonly believed, directly contradicting narratives about declining capacity with age.

About this episode

In this episode of The Diary of a CEO, host Steven Bartlett interviews Dr. Stephanie Estima, a chiropractor and women's health expert with 20 years of clinical practice, who delivers a pointed critique of mainstream fitness advice for women. Dr. Estima argues that society has sold women a destructive lie: that their worth is determined by the number on the scale. She presents evidence that the pursuit of extreme thinness leads to osteoporosis, hormonal dysfunction, and metabolic damage, with devastating long-term consequences. Drawing from both her clinical work with tens of thousands of patients and her own experience competing in figure competitions, she reveals she lost her menstrual cycle, developed hormonal issues, and hated herself at her leanest despite receiving constant external validation. The conversation systematically debunks major fitness myths, including the fear that lifting heavy weights will make women bulky (which Dr. Estima says is physiologically impossible for 97-98% of women due to testosterone levels), that carbohydrates cause weight gain, and that extended fasting is beneficial for female metabolism. She explains that long fasting protocols can shut down female fertility by mimicking famine conditions. Dr. Estima introduces four archetypes women fall into on their fitness journeys: Overwhelmed Olivia, Skinny Fat Sophia, Exorcist Emily, and Dialed In Diana, with detailed strategies for each. She emphasizes that women should focus on building muscle, bone density, and connective tissue capacity rather than pursuing weight loss, particularly as they age. The episode covers practical protocols including the importance of 10 sets per muscle group weekly, the Norwegian 4x4 cardiovascular protocol that increased VO2 max by 10% in postmenopausal women in eight weeks, and essential supplements including magnesium, omega-3s, vitamin D, creatine, and collagen. Dr. Estima also addresses specific maternal health issues including pelvic floor dysfunction and the anatomical differences between male and female pelvises that affect training. She closes by stating women should stop being so hard on themselves and remember they are not behind in their fitness journey.

Key takeaways

Dr. Estima claims society's focus on female thinness causes osteoporosis, hormonal issues, and long-term metabolic damage by prioritizing weight loss over muscle and bone building.
She revealed she lost her menstrual cycle and developed hormonal dysfunction while competing in figure competitions at 11% body fat despite receiving external praise.
97 to 98% of women cannot bulk from weightlifting due to insufficient testosterone levels, making the fear of getting too muscular physiologically impossible for most women.
Extended fasting can shut down female fertility by signaling famine conditions to the reproductive system, causing the body to stop producing eggs as a protective mechanism.
Research on postmenopausal women showed 10% VO2 max improvement in 8 weeks with 69% mitochondrial efficiency gains, higher than younger cohorts at 49%.
Women should aim for 10 sets per muscle group weekly, focusing on shoulders, back, glutes, inner thighs, and core to build an hourglass figure through spot building.
Female pelvic anatomy differs significantly from males with wider hips and more openings, requiring different training approaches and creating higher ACL injury risk when fatigued.