Dominic Stone
Running is a popular form of exercise that provides many health benefits, including improved aerobic endurance and weight loss. However, it is often debated whether running causes muscle loss or gain. While some sources suggest that long-distance running can break down muscle and cause muscle damage, others claim that short bursts of high-intensity running can build lower body muscle. The impact of running on muscle mass depends on various factors, including the intensity, duration, and frequency of running, as well as individual factors such as diet and overall health.
| Characteristics | Values |
|---|---|
| Muscle loss | Long-distance running can cause muscle loss |
| Muscle gain | High-intensity, short-duration running can build muscle |
| Muscle damage | Running can cause muscle damage, but recovery strategies can enhance muscle recovery |
| Muscle soreness | Running can cause delayed onset muscle soreness |
| Muscle swelling | Running can cause muscle swelling |
| Muscle strength | Running can cause reduced muscle strength |
| Muscle growth | Running is more likely to cause muscle growth in the lower body |
| Muscle efficiency | Smaller muscles are more efficient for running |
| Muscle recovery | Muscle recovery can take up to 5 days after running |
| Muscle preservation | Running can help fight age-related muscle loss |
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What You'll Learn
Short bursts of high-intensity running build muscle
Running is a great form of exercise that can be highly beneficial for your health. However, the question of whether it causes muscle loss or builds muscle is more complex.
High-intensity training (HIT) involves short bursts of effort followed by short rest periods, keeping your heart rate up while working your muscles. Examples of HIT include CrossFit, HIIT (High-Intensity Interval Training), and metabolic conditioning (METCONs).
HIT can indeed help build muscle, especially for beginners. For those new to exercise, HIT, CrossFit, HIIT, or bodyweight exercises can all contribute to initial muscle gain. However, over time, the body adapts to high-intensity workouts, and building muscle becomes more challenging. This is because HIT often focuses more on speed than strength, and while it can burn fat, it may not build muscle as effectively as heavy lifting or progressive overload techniques.
To effectively build muscle with HIT, it is recommended to incorporate heavy lifting 2-4 days a week, focusing on exercises like squats, deadlifts, presses, and pull-ups with progressive overload. Additionally, balancing your training with strength workouts and adequate rest days is crucial. Eating a sufficient amount of protein is also essential, as your muscles need it to grow.
In conclusion, while short bursts of high-intensity running can be beneficial for overall health and initial muscle gain, particularly for beginners, it may not be the most effective method for long-term muscle building. Incorporating HIT with other strength training techniques, proper nutrition, and rest can help maximize muscle growth while enjoying the benefits of high-intensity running.
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Long bouts of low-intensity running degrade muscle
Running is a popular form of exercise with many health benefits, including improved aerobic endurance and weight loss. However, the effect of running on muscle mass is more complex and depends on various factors such as the intensity and duration of the runs.
Short bursts of high-intensity running, such as sprinting or high-intensity interval training (HIIT), can help build lower body muscle. After 10 weeks of HIIT workouts three times per week, recreationally trained college students showed an 11% increase in the muscle fiber area of their quadriceps compared to a control group. Similarly, studies have shown that high-intensity, short-duration running increases muscle protein synthesis (MPS) and promotes muscle growth, especially in the quadriceps and hamstrings.
On the other hand, long bouts of low-intensity running, such as long-distance running, can degrade muscle. This is because the body adapts to the demands of endurance running by prioritizing efficiency over muscle mass. As a result, the fast-twitch muscle fibers responsible for powerful, explosive movements begin to shrink, while the slow-twitch fibers associated with endurance increase in size but not enough to offset the loss of fast-twitch fibers. This leads to smaller, more physiologically efficient muscles, which is why elite distance runners often have slim physiques with minimal muscle mass.
Additionally, it's important to consider the potential for muscle damage during long-distance running. Studies have shown that long-distance running can cause significant muscle damage, which may negatively impact endurance running performance and inhibit muscle growth. However, the effects of muscle damage are usually temporary, and proper recovery strategies can help enhance running performance and minimize muscle loss.
Overall, while short-duration, high-intensity running can promote muscle growth, long bouts of low-intensity running may degrade muscle due to the body's focus on efficiency and the potential for muscle damage. To maintain or increase muscle mass, it's crucial to structure your running routine appropriately, incorporate resistance training, and maintain a well-balanced diet with adequate protein intake.
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Running improves aerobic endurance
Running is one of the most demanding forms of endurance exercise in terms of energy spent per minute of activity. The body has two systems to meet the energy demands of running: the aerobic and anaerobic systems.
Aerobic running is key to improving your running fitness and setting new personal bests across all distances. Aerobic training spurs the growth of existing mitochondria and stimulates the production of additional "power factories" within your muscles. This results in an increased capacity to produce energy, allowing you to run faster and longer.
During aerobic activity, the body's smallest blood vessels, called capillaries, transport oxygen and remove waste products to and from the muscles. Training at an aerobic intensity level stimulates the body to increase the number of capillaries during recovery. This, in turn, boosts your endurance and makes you a more durable runner.
To improve your aerobic capacity, you can try running slightly faster than your 5-K race pace. For example, if your 5-K race pace is 7:40 per mile, you should run your max VO2 workouts at a pace between 7:20 and 7:30. This type of workout is challenging and cannot be maintained for very long, so it is often done in intervals of 800 meters or 3 to 5 minutes, with 4 to 5 minutes of slow jogging in between.
Additionally, high-intensity interval training (HIIT) can be combined with regular longer runs to boost your VO2 max, lower your resting heart rate, and increase the amount of blood pumped by your heart with each beat, all of which contribute to improved endurance.
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Running fights age-related muscle loss
As we age, our muscle mass and strength gradually decline, worsening with each passing decade. This decline can be attributed to several factors, including reduced dietary protein intake, decreased physical activity, a decline in hormone levels, chronic inflammation, muscle denervation, mitochondrial dysfunction, infiltration of fat into muscle, and insulin resistance. Research suggests that the rate of loss of muscle strength is greater than the loss of muscle mass and plays a crucial role in healthy ageing. This loss of muscle strength and function, including physical performance, with ageing, is known as sarcopenia.
Running, when done in short bursts of high-intensity, can help build muscle. However, long bouts of low-intensity running can degrade muscle. A 2017 report in Medicine and Science in Sports and Exercise demonstrated that ultra-marathon runners tend to have very little muscle mass. In the study, middle-aged men lost more than two pounds of muscle mass after a 31-mile race.
On the other hand, running can help fight age-related muscle loss. A 2018 review in the International Journal of Geriatrics and Gerontology supports this claim. Running enhances aerobic capacity, increases muscle mass, promotes good cholesterol, and decreases body fat. The key is to structure your running routine properly, including adequate physical activity and a well-balanced diet with sufficient protein.
To prevent age-related muscle loss, both nutrition and exercise are vital. A combination of regular resistance exercises and a daily whey protein supplement has been shown to improve hand grip strength in older adults. Maintaining a fitness regimen that focuses on muscle and bone preservation is crucial, especially for former competitive runners, to lower the risk of sarcopenia and osteoporosis.
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Running can cause muscle damage
Running is a popular form of exercise that provides many health benefits, such as improving aerobic endurance and reducing stress. However, it is essential to understand that running can also cause muscle damage and loss of muscle mass, especially when performed at high volumes and intensities.
High-volume endurance training, such as long-distance running, can lead to smaller running muscles. This occurs because, during endurance training, the fast-twitch muscle fibres shrink while the slow-twitch fibres grow, resulting in a net loss of muscle mass. Additionally, long-distance running can break down muscle instead of building it, leading to muscle degradation over time.
The impact of running on muscle damage and loss is influenced by the intensity and duration of the runs. Short bursts of high-intensity running, such as sprinting or high-intensity interval training (HIIT), can help build lower body muscle. This type of training stimulates muscle protein synthesis (MPS) to exceed muscle protein breakdown (MPB), resulting in net muscle gain. However, long bouts of low-intensity running can degrade muscle due to the extended period of muscle activity.
Furthermore, the structure of a running routine plays a crucial role in preventing muscle loss. Overtraining and insufficient recovery time can contribute to muscle damage and impair endurance running performance. It is recommended to incorporate resistance training and proper nutrition to support muscle growth and recovery. A well-balanced diet, adequate protein intake, and proper hydration are essential for muscle building and maintaining overall health.
While running can cause muscle damage and loss of muscle mass, it is important to note that the impact varies depending on individual factors, running routines, and other variables. To mitigate muscle loss, runners should focus on structured running programs, incorporate strength training, and maintain a balanced diet to support overall health and muscle growth.
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Frequently asked questions
Running can cause muscle loss if performed at low intensity over long durations. However, short bursts of high-intensity running can promote muscle growth.
Endurance exercises such as long-distance running and downhill running can cause muscle loss.
High-intensity exercises such as sprinting and HIIT can promote muscle growth.
To prevent muscle loss, it is important to maintain a well-balanced diet with sufficient protein and avoid overtraining.
