Scientific Weekly Scheduling of Aerobic and Anaerobic Workouts in Swimming Dual-Energy-System Training

Introduction

Many swimming enthusiasts in Taiwan often fall into a common trap when planning their training week: turning every workout into “moderate intensity.” As a result, they neither build their aerobic base nor develop their anaerobic capacity, and progress stalls. Sports science tells us that improving swimming fitness requires strategically stimulating both energy systems and distributing them sensibly throughout the week.

The human body primarily relies on three energy systems: the phosphocreatine system (ATP-PC, used for 0–10 second maximal sprints), the glycolytic system (10 seconds–2 minutes of moderate-to-high intensity), and the oxidative system (aerobic activity lasting over 2 minutes). Complete swimming fitness requires balanced development of all three.

The Three Energy Systems in Swimming

Weekly Energy System Distribution Strategy

An effective weekly training plan requires spacing workouts of different intensities based on energy system recovery times:

High-intensity (anaerobic/HIIT) workout recovery requirement: 48–72 hours
Moderate-intensity (threshold/Tempo) workout recovery requirement: 24–36 hours
Low-intensity (aerobic/recovery swim) workout recovery requirement: 12–24 hours

Standard Four-Sessions-Per-Week Dual Energy System Schedule

Using an intermediate swimmer training four times per week as an example:

Monday (Moderate-intensity aerobic threshold session):

• 400m warm-up
• 6 × 200m @ CSS, 20 seconds rest
• 400m cool-down
• Energy system focus: oxidative system + upper end of glycolytic system

Wednesday (High-intensity HIIT session):

• 600m warm-up (including progressive swims)
• 25m × 12 sets @ 100% all-out, 40 seconds rest
• 400m cool-down
• Energy system focus: ATP-PC + glycolytic system

Friday (Easy recovery and technique session):

• 1500m continuous at Z1–Z2 (technique work as the main focus)
• Energy system focus: low-intensity oxidative system

Sunday (Long-distance aerobic session):

• 3500–4000m continuous swim @ Z2
• Energy system focus: oxidative system (maximal stimulus)

Three-Session Version (For Busy Office Workers)

For many office workers in Taiwan, training four times a week is a luxury. Here is a streamlined three-session-per-week version:

• Tuesday (Aerobic threshold intervals): 400m warm-up + 8 × 100m @ CSS + 400m cool-down, approximately 1600m total
• Thursday (High-intensity HIIT): 600m warm-up + 25m × 10 sets @ all-out + 400m cool-down, approximately 1250m total
• Saturday (Long-distance aerobic): 3000m continuous swim @ Z2

Warning Signs: Symptoms of Overtraining

Poorly arranged dual energy system training can easily lead to overtraining. Here are warning signs that require an immediate reduction in volume:

• Resting heart rate is 5–7 bpm higher than your average
• Extreme fatigue after training for 3 or more consecutive days
• Swim speed on the same workout continues to decline
• Sleep quality noticeably deteriorates
• Low mood and loss of motivation for training

Practical Recommendations

• Consider your schedule in Taiwan: Swimmers in Taiwan typically train between 6–7 AM or 6–8 PM. It is best to schedule high-intensity workouts after a day with sufficient sleep
• Female swimmers and the menstrual cycle: During the premenstrual phase (late luteal phase), body temperature is higher and fatigue increases. It is recommended to schedule low-intensity aerobic sessions during this time and avoid HIIT
• Track your rate of perceived exertion (RPE): Record a fatigue score of 1–10 after each session. If it exceeds 8 for three consecutive days, active recovery is needed
• Schedule one “recovery week” per month: Reduce training volume to 60–70% of a normal week to allow the body to achieve supercompensation

Conclusion

Swimming fitness is not built through a single type of training, but through the scientific interaction of aerobic and anaerobic systems within the week. Mastering the training logic of the dual energy systems and flexibly adjusting your schedule based on your own recovery capacity is the core strategy for Taiwanese swimmers to keep improving. Remember: the best training plan is not the most exhausting one—it is the smartest one.

Related Reading

• Swimming Energy System Training: Ratios of Phosphocreatine, Lactate, and Aerobic Systems
• Swimming Energy Metabolism: Proportions of Aerobic and Anaerobic Systems at Different Intensities
• Swimming Speed Combination Training: Weekly Pairing of Sprints and Long-Distance Training
• 4-Week Anaerobic Interval Intensification for Swimming: Breaking Through Your Speed Ceiling