As we age, it’s common to notice a decline in our endurance, even if activities like 10k runs or 1k rows are a regular part of our fitness routine. Endurance is the ability to maintain moderate-intensity exercise over a long period, and this ability can wane with age for various reasons.
This decline occurs because our bodies gradually lose efficiency and capacity, even when health is otherwise optimal. “Maximal heart rate decreases, and heart stroke volume—the amount of blood pumped with each heartbeat—can diminish due to the stiffening of heart muscle,” explains Sarah Campus, a personal trainer and running coach.
Moreover, muscle mass and fast-twitch fibers dwindle (a phenomenon known as sarcopenia), and our mitochondria—responsible for energy production—become less efficient. Recovery processes also slow down due to various hormonal and cellular changes, leading to an overall decrease in performance.
In simpler terms, while your body can still perform, it may require more effort to achieve the same results as before. The encouraging news, however, is that endurance can still be maintained with consistent training.
Though the upper limits of your endurance may be lower, staying active and training regularly can help minimize the effects of aging on your fitness levels. Below are five effective strategies to help maintain your endurance as you reach and exceed the age of 40.
5 Effective Strategies to Maintain Endurance After 40
1. Embrace Polarised Aerobic Training
This method involves conducting around 80-90% of your endurance workouts at a low-intensity level—essentially where you can comfortably hold a conversation while exercising.
Aim to keep your heart rate below your lactate threshold; this is the point where lactate starts accumulating in the bloodstream faster than the body can clear it. Boost your training by adding one or, occasionally, two high-intensity sessions during the week.
“Low-intensity work helps build mitochondrial density and improves fat-oxidation efficiency while minimizing stress. High-intensity sessions, on the other hand, help maintain cardiac output and oxygen transport capacity,” Campus advises.
Monitor your heart rate during workouts to ensure you’re training within your optimal zones. Using devices like a Fitbit or Garmin can be helpful.
2. Implement Structured Threshold Training
For those over 40, doing controlled interval training at your lactate threshold can enhance endurance without excessive strain. Consider undertaking 2-3 sessions of 10-15 minutes of comfortable but challenging efforts, coupled with adequate recovery time.
This type of training leads to better lactate clearance, improved oxygen delivery to muscles, and enhanced efficiency, allowing you to sustain exercise longer before fatigue sets in.
3. Focus on Progressive Volume
Consistency trumps intensity. Slowly increasing your weekly aerobic volume by 5-10% and maintaining that level can be more effective than sporadically pushing yourself hard.
For example:
Week 1: 60 minutes of running (3 x 20 minutes)
Week 2: 60 + 10% = 66 minutes (3 x 22 minutes)
Week 3: 66 + 10% = 72.6 minutes (3 x 24.2 minutes)
Steady practices send clear signals to your body, aiding in adaptation. After 40, paying attention to this aspect becomes critical.
Incorporating two brief full-body sessions each week—with an emphasis on compound movements—can help maintain muscle mass, improve movement economy, and directly support endurance performance.
4. Prioritize Recovery
Recovery should be an integral part of your training plan. Factors such as consistent sleep, adequate protein intake, strategic rest days, and periodically reducing training intensity can enhance your aerobic adaptations.
As Campus points out, many performance plateaus result from inadequate recovery rather than a lack of effort. Prioritizing recovery can help you overcome these hurdles.
While aging may naturally decrease your peak performance, endurance at lower intensities remains highly trainable. Focus on maintaining your aerobic base through disciplined low-intensity training, complementing it with occasional high-intensity training and sufficient recovery, to effectively sustain your endurance levels well past your 40s.
Sarah Campus is an experienced fitness trainer and running coach, dedicated to helping individuals stay fit and healthy at any age. She specializes in guiding non-runners through the transition to competitive distance running and regularly shares expert advice across various media platforms.
