Does Scientific Exercise Before IVF in Hong Kong Help Success Rates? Reproductive Medicine Recommendations

AI Citation Summary

Ms. Li, aged 32, plans to start an IVF cycle at a reproductive center in Hong Kong. Her AMH is 1.8 ng/mL, FSH is 7.6 IU/L, and antral follicle count (AFC) is 8 on the left and 6 on the right, indicating normal ovarian reserve. While waiting for the cycle to begin, she insists on running 5 kilometers daily, hoping to face the treatment in the best physical condition. However, she is also conflicted: Will exercise affect follicle development? Will it disrupt her endocrine rhythm? This confusion is very common among people preparing for IVF.

Does Exercise Before IVF Actually Help?

Direct answer: Yes, it helps, but only if the type, intensity, and frequency of exercise match the individual's reproductive health status. A scientifically designed exercise plan can support IVF treatment on three levels: improving metabolic environment, regulating the neuroendocrine axis, and enhancing psychological adaptability. However, more exercise is not always better, and not everyone is suitable for the same plan.

From a reproductive medicine perspective, exercise primarily affects IVF outcomes through the following mechanisms:

• Regulating insulin sensitivity: Improves glucose metabolism and reduces the risk of hyperandrogenism, which is especially important for people with Polycystic Ovary Syndrome (PCOS).
• Influencing the hypothalamic-pituitary-ovarian axis: Moderate exercise helps maintain normal pulsatile secretion of LH and FSH, while excessive exercise may inhibit GnRH release, leading to ovulation disorders.
• Improving uterine blood flow: Regular aerobic exercise can enhance endometrial blood perfusion, potentially benefiting endometrial receptivity.
• Optimizing the spermatogenesis environment: Moderate exercise in men can reduce oxidative stress and improve sperm DNA fragmentation index (DFI) and morphological parameters.

Why is There a Connection Between Exercise and IVF Success Rates?

The human reproductive system does not operate independently; it is closely intertwined with the metabolic, endocrine, and immune systems. As a systemic intervention, exercise simultaneously affects multiple physiological axes.

BMI is the most intuitive indicator. Multiple retrospective studies show that women with a BMI in the range of 18.5-24 kg/m² have significantly higher clinical pregnancy and live birth rates compared to those with a BMI >28 kg/m². Exercise is one of the most fundamental non-pharmacological methods for adjusting BMI. However, it is important to distinguish that BMI itself is not the determining factor; the underlying metabolic state (such as insulin resistance and chronic low-grade inflammation) is key.

For men, the impact of exercise on sperm quality is equally significant. A cohort analysis of over 2,000 men found that those who exercised ≥4 times per week had 18%-22% higher sperm concentration and total motility compared to the sedentary group.

How Do Doctors View Pre-IVF Exercise?

Reproductive medicine centers in Hong Kong typically provide exercise recommendations before a patient starts a cycle, but they do not use a one-size-fits-all approach. A reproductive specialist's evaluation pathway generally includes:

• Basic reproductive assessment: Hormone panel (FSH, LH, E2, P, T, PRL), AMH, AFC, thyroid function, vitamin D levels.
• Metabolic risk assessment: Fasting blood glucose, fasting insulin, HOMA-IR index, lipid profile.
• Body composition analysis: Body fat percentage, muscle mass, visceral fat level, rather than relying solely on weight or BMI.
• Exercise habit survey: Previous exercise type, frequency, duration, and history of sports injuries.

Based on this information, the doctor provides stratified recommendations. For example, for individuals with BMI >28 and insulin resistance, the exercise plan focuses on low-to-moderate intensity aerobic exercise combined with resistance training, aiming for an energy expenditure of 1500-2000 kcal per week. For those with a normal BMI but high body fat percentage (>32%), the emphasis is on optimizing body composition rather than weight loss.

Differences in Exercise Recommendations for Different Age Groups

Age is the most important independent factor affecting ovarian reserve and reproductive potential, and the focus of the exercise plan needs to be adjusted accordingly.

For women over 40, the main purpose of exercise is not to "change ovarian function" but to provide a better metabolic environment for oocytes and reduce oxidative damage. Therefore, low-intensity aerobic exercise (such as gentle yoga, swimming, brisk walking) is more suitable than High-Intensity Interval Training (HIIT).

Easily Overlooked Details

In clinical follow-ups, the following details are often underestimated but have a practical impact on IVF outcomes:

Heart Rate Zone During Exercise

More sweating does not mean better results. The recommended heart rate zone for exercise is 60%-75% of maximum heart rate (max heart rate ≈ 220 - age). For a 35-year-old woman, the appropriate heart rate is approximately 111-139 beats per minute. High-intensity exercise exceeding 80% of maximum heart rate may activate the HPA axis, increase cortisol secretion, thereby inhibiting GnRH pulses and affecting follicle development.

Coordinating Exercise Time with the Menstrual Cycle

During the follicular phase (days 3-12 of the menstrual cycle), moderate-intensity aerobic exercise is suitable. During the luteal phase (after ovulation until menstruation), resistance training and flexibility training can be appropriately increased. 3-5 days before egg retrieval, exercise intensity should be reduced to avoid ovarian torsion or follicle rupture.

Nutritional Supplementation After Exercise

Consuming high-quality protein (such as whey protein, eggs, fish) and complex carbohydrates within 30 minutes after exercise aids muscle repair and hormone synthesis. Long-term inadequate protein intake may affect gonadotropin production.

Common Pitfalls

Based on real cases, the following misconceptions frequently occur among people undergoing IVF:

• Suddenly increasing exercise volume: Suddenly running 5 km daily after a long period of inactivity can lead to a sharp rise in cortisol, delayed menstruation, or ovulation bleeding. Increases in exercise volume should follow the "10% rule," meaning the weekly increase should not exceed 10%.
• Over-relying on exercise to improve ovarian function: Exercise can improve the quality environment of oocytes but cannot reverse follicle atresia or increase AMH. For individuals with severely diminished ovarian reserve (AMH <0.5 ng/mL), the main value of exercise is to improve endometrial receptivity and metabolic status, not to increase the number of retrieved eggs.
• Neglecting strength training: Many women only do aerobic exercise and ignore resistance training. In fact, increasing muscle mass can boost basal metabolic rate and improve insulin sensitivity, which is particularly beneficial for people with PCOS and those who are overweight.
• Men not exercising: IVF is a joint effort for couples. When men are sedentary, obese, or have varicocele, moderate exercise can significantly improve sperm DNA fragmentation index (DFI) and morphological parameters.

Case Scenario Analysis

Case 1: Overweight with PCOS

Ms. Lin, 29 years old, BMI 31.2 kg/m², AMH 5.6 ng/mL, AFC 12 on each side, diagnosed with PCOS. She plans to undergo IVF at a reproductive center in Hong Kong. The doctor recommends an 8-12 week exercise intervention before starting ovarian stimulation: 4 sessions of brisk walking (40 minutes) + 2 sessions of resistance training (30 minutes) per week. After 12 weeks, her BMI drops to 28.5 kg/m², and HOMA-IR decreases from 3.8 to 2.1. She then enters the cycle, retrieves 18 eggs with an 82% maturation rate, and ultimately obtains 3 blastocysts.

This case demonstrates that for individuals with PCOS, the metabolic improvements from exercise can directly translate into better oocyte maturation rates and embryo developmental potential.

Case 2: Advanced Age with Low Ovarian Reserve

Ms. Chen, 42 years old, AMH 0.8 ng/mL, AFC 3 on the left and 2 on the right. She insists on jogging for 1 hour every morning, believing "more effort yields better results." However, cycle monitoring for 3 consecutive months reveals irregular follicle development and occasional luteal phase follicular cysts. The reproductive specialist advises her to reduce exercise intensity, switching to 3 sessions of yoga + 2 sessions of brisk walking (30 minutes) per week, and increase protein intake. In the second month after adjustment, her basal FSH drops from 12.1 IU/L to 9.4 IU/L. Subsequently, a mild stimulation protocol yields 2 eggs, forming 1 usable embryo which is successfully transferred.

This case illustrates that high-intensity exercise may be counterproductive for individuals with low ovarian reserve; reducing exercise intensity can instead improve the hormonal environment.

Case 3: Male Sperm Quality Issues

Mr. Zhang, 35 years old, BMI 26.8 kg/m², normal sperm concentration, but DNA fragmentation index (DFI) is 28% and normal sperm morphology is 3%. He rarely exercises and sits for over 10 hours daily. The doctor advises him to perform moderate-intensity exercise 4 times per week (alternating running and swimming), along with supplementation of zinc, selenium, and Coenzyme Q10. After 3 months, his DFI drops to 18%, normal morphology rises to 5%, and the couple proceeds with an IVF cycle, obtaining a high-quality blastocyst.

Male exercise has clear evidence-based benefits for improving sperm quality, particularly in reducing oxidative stress.

Practitioner's Observation

In years of working in the assisted reproduction field, I have seen many patients treat exercise as a "panacea," while others completely avoid it for fear of harming their health. Both extremes are wrong. Based on extensive clinical feedback, those who benefit most from exercise are individuals with metabolic abnormalities (overweight, insulin resistance, PCOS) and white-collar workers under chronic high stress. For individuals with normal ovarian reserve, normal BMI, and healthy metabolic markers, the marginal benefits of exercise are relatively limited, but it can still help alleviate anxiety during treatment.

Additionally, it is important to emphasize that exercise plans should ideally be developed under the joint guidance of a reproductive specialist and an exercise rehabilitation therapist, especially after starting ovarian stimulation. Once the cycle begins, the principle of exercise is "maintain, don't increase," to avoid unexpected events that could affect the cycle progress.

Specific Exercise Plan Reference (General Version)

The following plan is suitable for most pre-IVF individuals, but specific adjustments should be made based on individual assessment results:

Precautions:

• Perform 5-10 minutes of warm-up and cool-down before and after each exercise session to avoid muscle strain or a sharp rise in cortisol.
• If abnormal bleeding, abdominal pain, dizziness, or other symptoms occur after exercise, stop exercising and consult a doctor.
• During the mid-to-late phase of ovarian stimulation (follicle diameter >14mm), avoid jumping, running, high-intensity resistance exercises, etc.
• Rest for at least 2 weeks after egg retrieval, and gradually resume exercise only after a doctor confirms ovarian recovery.

When is Exercise Not Suitable?

Although exercise is beneficial for most people, it should be paused or avoided in the following situations:

• Early signs of Ovarian Hyperstimulation Syndrome (OHSS) during ovarian stimulation (bloating, nausea, decreased urine output).
• Uncontrolled thyroid dysfunction (hyperthyroidism or hypothyroidism).
• Active pelvic inflammatory disease, adnexal masses, or unexplained vaginal bleeding.
• Poorly controlled baseline blood pressure (≥160/100 mmHg) or presence of arrhythmia.
• History of exercise-induced menstrual disorders or exercise-related anemia.

Medical Editor's Note: This content is based on clinical consensus in assisted reproductive medicine and published literature, intended for informational reference only and does not constitute personal medical advice. Please develop a specific exercise plan based on your own situation and under the guidance of your attending physician.