Acibadem International's recent explainer clarifies how strength training, aerobic activity and daily movement impact daily energy expenditure and metabolism.
On September 20, 2026, Acibadem International published a detailed explainer on how various forms of exercise influence human metabolism. The medical overview was updated on September 22 and attributed to Dr. Şule Eren. The publication clarifies how strength training, aerobic activity and daily movement affect daily energy expenditure, showing that no single exercise completely alters your metabolic rate overnight. Instead, different types of physical activity support different components of long-term body composition and fat oxidation.
To understand how movement affects your metabolism, you first have to look at daily energy expenditure. Acibadem estimates that your resting or basal metabolism accounts for roughly 60 to 70 percent of the calories you burn each day. This is the baseline energy your body requires simply to stay alive and function at rest. The digestion and processing of food account for approximately 10 percent of your daily expenditure, while physical activity makes up the remaining 15 to 30 percent.
The physical activity component includes both formal structured workouts and general daily movement. The non-exercise portion of this category is biologically known as non-exercise activity thermogenesis. This includes all the energy you use for walking, standing, pacing and performing household work. The medical overview emphasizes that consistent daily activity often contributes more to your total energy expenditure than a single structured workout.
Your body composition also plays a specific biological role in determining your resting metabolism. Acibadem estimates that a pound of muscle uses approximately six calories per day at rest, whereas a pound of fat uses approximately two calories per day. This means that preserving or building lean muscle tissue provides a small but consistent increase in your daily baseline energy needs. This tissue preservation is crucial because adults who do not train may lose approximately three to eight percent of their muscle mass per decade after age 30.
Food composition directly influences the thermic effect of digestion. The Acibadem article notes that digesting dietary protein requires significantly more energy than processing other nutrients. They estimate the thermic effect of protein at 20 to 30 percent of the calories consumed. Carbohydrates require roughly five to 10 percent of their energy for digestion, while fat requires less than five percent.
This nutritional processing effect means that a higher protein intake naturally requires your body to work harder during digestion. However, these thermic effect figures should not be used to imply that eating high amounts of protein overrides your total calorie intake entirely. Energy balance still dictates weight management, even if different macronutrients require varying amounts of energy to digest. It simply demonstrates that food quality and composition are important variables in the broader metabolic equation.
Adequate rest is another fundamental component of metabolic health that often goes overlooked. Acibadem reports that a controlled sleep comparison involving approximately 5.5 versus 8.5 hours found a less favorable pattern of weight loss with shorter sleep. The body requires sufficient recovery time to repair muscle tissue and regulate metabolic function properly. Prioritizing rest ensures that your body can efficiently process nutrients and maintain healthy energy expenditure.
Mainstream fitness media frequently exaggerates the immediate metabolic effects of intense exercise. A common claim is that high-intensity interval training keeps your metabolism elevated for 48 hours. However, Acibadem reports that excess post-exercise oxygen consumption generally contributes only six to 15 percent of the total calories burned during a session. Most of this additional calorie burn occurs in the first one to two hours, meaning a 300-calorie interval session might only generate about 20 to 45 additional calories.
The hype surrounding maximal effort often pushes people to ignore their physical limits. The Acibadem article warns that people with heart disease, uncontrolled blood pressure or joint problems should seek medical advice before beginning high-intensity exercise routines. Furthermore, persistent fatigue, unexplained weight change or excessive thirst warrant medical assessment rather than a punishing new gym schedule. Pushing through concerning symptoms in an attempt to forcefully elevate your metabolism is both medically unsafe and counterproductive to sustainable progress.
The metabolic benefits of gaining muscle are also frequently overstated in popular media. You might have heard the persistent myth that adding a single pound of muscle burns an extra 50 calories per day. Based on Acibadem's estimate of six calories per pound, gaining three to five pounds of muscle might only increase your resting expenditure by roughly 20 to 30 calories daily. This modest effect supports long-term health rather than acting as a rapid weight-loss mechanism.
Age-related metabolic decline is another area filled with persistent misunderstanding. People often assume their metabolism automatically drops the moment they turn 40. The publication discusses a 2021 Science study involving more than 6,400 people to provide a clearer picture. The researchers found that size-adjusted metabolic rates remained essentially stable from roughly age 20 to 60, with a decline of approximately 0.7 percent per year only beginning after age 60.
This data fundamentally reframes how we view midlife weight management. If your resting metabolic rate remains stable through your forties and fifties, weight changes are not just an inevitable result of aging. Changes in body composition, sleep quality, daily movement and eating habits are typically the real drivers. Weight changes are never simply a matter of willpower, as factors like exercise, appetite and sustainable routines all interact to influence your body over time.
The Acibadem publication provides specific estimates for how different activities contribute to energy expenditure. For a 155-pound adult, a brisk 30-minute walk may use approximately 100 to 150 calories, while one hour of strength training may use roughly 200 to 400 calories. Vigorous steady-state cardio can require approximately 400 to 700 calories per hour. Meanwhile, a 30-minute session of high-intensity interval training might use around 250 to 400 calories depending on body size and fitness level.
These specific energy estimates highlight a crucial distinction between acute calorie burn and long-term body composition. While vigorous steady-state cardio can burn an impressive amount of energy during a long session, its metabolic impact largely stops when the workout ends. Resistance training may not produce the highest immediate calorie burn, but it provides a biological stimulus to retain lean mass. The practical implication is that asking which exercise burns the most calories is different from asking which exercise best supports sustainable fat loss.
The article emphasizes that different exercise types serve vastly different metabolic purposes. Cardio burns more energy during a long session and significantly improves cardiovascular fitness. Strength training is essential for retaining lean mass during weight loss, making it a critical body-composition strategy. The explainer cites CDC guidance recommending strength training for all major muscle groups on at least two days per week.
This foundational strength work should be combined with approximately 150 minutes of moderate aerobic activity weekly for optimal health. To build a sustainable routine, you must understand what different types of movement actually do for your body. Everyday movement outside the gym offers massive potential for increasing total daily energy expenditure. Acibadem reports that non-exercise activity thermogenesis can differ between similar-sized people by as much as 2,000 calories per day.
This incredible variance shows how much occupational activity and daily habits dictate your energy needs. Taking the stairs, pacing during phone calls and interrupting sitting every 30 to 60 minutes can accumulate into significant energy use. Tracking your daily habits temporarily can help you master self-monitoring for sustainable weight loss. Small behavioral adjustments often yield more consistent outcomes than attempting completely unrealistic fitness overhauls.
High-intensity interval training involves short, hard efforts of 30 to 60 seconds alternated with recovery periods. Research reviews show that these intervals can produce similar aerobic improvements to moderate continuous training. However, Acibadem warns that intense intervals require substantial recovery and carry greater injury concerns for the general population. They suggest limiting these intense sessions to one to three times per week.
Consistent moderate activity is often better for your body than punishing routines that lead to physical burnout. The goal is to build a training plan that can survive midlife responsibilities. This is why the medical overview explicitly favors sustainable exercise that people can repeat over a theoretically superior routine that they abandon. You should judge success by physical function, consistency, sleep quality and the ability to retain muscle over time.
Future scientific inquiry needs to focus on adaptive thermogenesis and the complex ways our bodies respond to increased activity. While we know that adding exercise increases daily energy expenditure, the relationship is not always perfectly linear. Researchers need to observe how people unconsciously reduce their daily movement after particularly exhausting workouts. Understanding these compensatory behaviors will help clinicians design more effective and realistic fitness protocols for the general public.
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