Aerobic fitness is a stronger independent predictor of morbidity and mortality compared with physical activity. However, it is difficult sometimes to delineate between the individual effects of aerobic fitness versus total weekly caloric energy expenditure (physical activity). Furthermore, measuring total weekly energy expenditure in both free-living and structured exercise is much more difficult than measuring aerobic fitness.
Keep in mind that both fuels are almost always burned simultaneously, except during the most intense, short-term bursts of energy, like sprinting and weightlifting. It's the percentage of fat and carbohydrate burned that changes during a workout depending on the intensity, but you almost never burn just one exclusively. You burn fat while you're at rest, and you burn it during virtually every moment of exercise. It's a myth to think that it takes 20-30 minutes of exercise before your muscles start burning fat.
A pound of fat equals 3,500 calories. To lose one pound a week, you will need to burn about 500 more calories per day than you eat. You can do this by increasing your calorie-burning activity or by eating fewer calories—or both. It is easier to achieve it with combining increased activity and eating less. Exercising enough each day to burn 300 to 400 calories is a good goal for the exercise portion of your weight loss plan.
For a walking surface grade between -5% to +5% inclusive, this walking calorie burn calculator is based on equations (shown below) derived by ShapeSense.com from experimental data displayed in Figure 3 of the study titled "Energy Cost of Running," by R Margaria, P Cerretelli, P Aghemo, and G Sassi (note that the data on walking energy expenditure was originally printed in the study titled "Sulla fisiologia, e specialmente sul consumo energetico, della marcia e della corsa a varie velocita ed inclinazioni del terreno," by R. Margaria). The experimental data gathered by Margaria measured calorie burn of subjects walking at various speeds and on various surface grades. It was found that there is a non-linear relationship between walking speed and rate of calorie burn, as opposed to calorie burn while running, which displays a linear relationship between speed and rate of calorie burn.
I defined aerobic exercise for you in the introduction. It's any activity that stimulates your heart rate and breathing to increase but not so much that you can't sustain the activity for more than a few minutes. Aerobic means "with oxygen," and anaerobic means "without oxygen." Anaerobic exercise is the type where you get out of breath in just a few moments, like when you lift weights for improving strength, when you sprint, or when you climb a long flight of stairs.
Leslie Sansone is America’s number-one walk expert and creator of the Walk at Home program. She believes that our bodies were made to move, and we can walk our way to health and wellness. She contributes her time, expertise and financial support to health organizations including the American Heart Association, American Cancer Society, American Diabetic Association and Muscular Dystrophy Association. She was inducted into the National Fitness Hall of Fame in 2014. Her newest DVD is “Just Walk: The Tone Every Zone Walk.”
Meta-analyses and reviews are useful for getting an overall sense of the many studies of aerobic exercise and BP. A 2007 meta-analysis of the effects of endurance exercise on BP found that exercise significantly reduced resting and daytime ambulatory BP.38 A more recent review (2010) found again that regular aerobic exercise lowered clinical BP.39 In both the 2007 meta-analysis and the 2010 review, aerobic exercise appeared to reduce BP more in patients with hypertension compared with those without hypertension. Five small studies in women systematically reviewed in 2011 showed a nonsignificant change in BP in response to aerobic interval training of walking. Walking programs appeared to reduce BP in some 9/27 trials reviewed in 2010. Larger trials with increased intensity or frequency of exercise for longer periods tended to be the ones that showed a significant effect.40 The authors concluded that further high-quality trials are needed. The most comprehensive and latest meta-analysis of all types of exercise clearly demonstrates the ability of aerobic exercise to lower BP within 8 to 12 weeks.41 In 105 trials, endurance exercise significantly lowered BP by 3.5/2.5 mm Hg. The effect was much larger in patients with preexisting hypertension (−8.3/6.8 mm Hg).
If it’s too hot to walk or run, swimming can be a cool way to get fit. It’s a low-cost workout for the whole body especially the muscles of the back, shoulder and arms and improves flexibility as well. It’s a good way to exercise if you’re overweight, pregnant or have joint problems as the water helps support your weight and can reduce the pressure on your joints. The risk of injury to muscles, ligaments or joints is also low.
“Those who had a faster stepping rate had similar health outcomes—lower BMI and lower waist circumference—as those who took the most steps per day,” says Schuna, one of the study authors. He recommends trying for a minimum of 100 steps per minute (roughly 2.5 to 3 miles per hour) or as brisk a pace as you can (135 steps per minute will get you up to about a 4 mph pace).
A major component of rehabilitation of children with MD is to prevent or slow functional losses. Aerobic activity is at the heart of improving and maintaining physical functioning. Despite the weakness, fatigue, loss of joint range of motion, and orthopedic changes, maintaining aerobic activity must be part of a comprehensive rehabilitation program. Studies have shown that aerobic capacity can be increased, improving functional abilities (Wright et al., 1996; Taivassalo et al., 1999). Continuous low to moderate resistive and aerobic exercises to promote fitness are suggested (Ansved, 2003). However, few if any studies have evaluated the long-term benefit or risks. Cardiac disease is one of the most common causes of death in patients with DMD. Potentially, cardiomyopathies and conduction abnormalities pose serious risks for patients with MD during aerobic and/or resistance training. The American Academy of Pediatrics (2005) recommended that, after the confirmation of DMD or Becker muscular dystrophy (BMD), a referral for cardiac evaluation with a specialist be made. The cardiac evaluation should include a complete history and physical, ECG, and transthoracic echocardiography (TTE). A complete cardiac evaluation should be completed every other year. In addition, starting at the age of 10 years or after the onset of cardiac signs/symptoms, cardiac evaluations should be completed annually. Specifically, symptoms of dilated cardiomyopathy, heart failure, cardiac arrhythmias, and respiratory abnormalities should be identified and treated.
Every session of aerobic exercise should include a warm-up and cool-down. The warm-up period should not include static stretching, but should instead be a gradual increase in pace and intensity of the exercise. This allows for the body to increase blood flow to the muscles, and decreases the likelihood of a muscle or joint injury. The warm-up should last between 5 and 10 minutes. The cool-down session should last a similar amount of time as the warm-up, with the pace gradually decreasing. Stretching exercises would be appropriate after aerobic exercise.
Your local gym will provide a wide variety of aerobic options, such as treadmills, cross trainers, exercise bikes, stairmasters, rowing and ski machines so that you can just switch on and get started with your workout. It can be a good idea to diversify between different machines and different speeds/levels of resistance as your body can get used to a certain routine and after a number of sessions the same routine will not work your heart and lungs as much as it once did.