Measuring Physical Activity Intensity

Here are some ways to understand and measure the intensity of aerobic activity: relative intensity and absolute intensity.

Relative Intensity

The level of effort required by a person to do an activity. When using relative intensity, people pay attention to how physical activity affects their heart rate and breathing.

The talk test is a simple way to measure relative intensity. As a rule of thumb, if you're doing moderate-intensity activity you can talk, but not sing, during the activity. If you're doing vigorous-intensity activity, you will not be able to say more than a few words without pausing for a breath.

Absolute Intensity

The amount of energy used by the body per minute of activity. The table below lists examples of activities classified as moderate-intensity or vigorous-intensity based upon the amount of energy used by the body while doing the activity.

Moderate Intensity

• Walking briskly (3 miles per hour or faster, but not race-walking)
• Water aerobics
• Bicycling slower than 10 miles per hour
• Tennis (doubles)
• Ballroom dancing
• General gardening

Vigorous Intensity

• Race walking, jogging, or running
• Swimming laps
• Tennis (singles)
• Aerobic dancing
• Bicycling 10 miles per hour or faster
• Jumping rope
• Heavy gardening (continuous digging or hoeing)
• Hiking uphill or with a heavy backpack

For more help with what counts as aerobic activity, watch this video: http://streaming.cdc.gov/vod.php?id=e6e0389dc5b6ce2438443ae0c848c2a320111024101650742

Resources: Centers For Disease Control & Prevention http://www.cdc.gov

Physical Activity for a Healthy Weight

Why is physical activity important?

Regular physical activity is important for good health, and it's especially important if you're trying to lose weight or to maintain a healthy weight.

• When losing weight, more physical activity increases the number of calories your body uses for energy or "burns off." The burning of calories through physical activity, combined with reducing the number of calories you eat, creates a "calorie deficit" that results in weight loss.
• Most weight loss occurs because of decreased caloric intake. However, evidence shows the only way to maintain weight loss is to be engaged in regular physical activity.
• Most importantly, physical activity reduces risks of cardiovascular disease and diabetes beyond that produced by weight reduction alone.

Physical activity also helps to–

• Maintain weight.
• Reduce high blood pressure.
• Reduce risk for type 2 diabetes, heart attack, stroke, and several forms of cancer.
• Reduce arthritis pain and associated disability.
• Reduce risk for osteoporosis and falls.
• Reduce symptoms of depression and anxiety.

 

How much physical activity do I need?

When it comes to weight management, people vary greatly in how much physical activity they need. Here are some guidelines to follow:
To maintain your weight: Work your way up to 150 minutes of moderate-intensity aerobic activity, 75 minutes of vigorous-intensity aerobic activity, or an equivalent mix of the two each week. Strong scientific evidence shows that physical activity can help you maintain your weight over time. However, the exact amount of physical activity needed to do this is not clear since it varies greatly from person to person. It's possible that you may need to do more than the equivalent of 150 minutes of moderate-intensity activity a week to maintain your weight.
To lose weight and keep it off: You will need a high amount of physical activity unless you also adjust your diet and reduce the amount of calories you're eating and drinking. Getting to and staying at a healthy weight requires both regular physical activity and a healthy eating plan.

What do moderate- and vigorous-intensity mean?

Moderate: While performing the physical activity, if your breathing and heart rate is noticeably faster but you can still carry on a conversation — it's probably moderately intense. Examples include—

• Walking briskly (a 15-minute mile).
• Light yard work (raking/bagging leaves or using a lawn mower).
• Light snow shoveling.
• Actively playing with children.
• Biking at a casual pace.

Vigorous: Your heart rate is increased substantially and you are breathing too hard and fast to have a conversation, it's probably vigorously intense. Examples include—

• Jogging/running.
• Swimming laps.
• Rollerblading/inline skating at a brisk pace.
• Cross-country skiing.
• Most competitive sports (football, basketball, or soccer).
• Jumping rope.

How many calories are used in typical activities?

The following table shows calories used in common physical activities at both moderate and vigorous levels.

Calories Used per Hour in Common Physical Activities
Moderate Physical Activity	Approximate Calories/30 Minutes for a 154 lb Person1	Approximate Calories/Hr for a 154 lb Person1
Hiking	185	370
Light gardening/yard work	165	330
Dancing	165	330
Golf (walking and carrying clubs)	165	330
Bicycling (<10 mph)	145	290
Walking (3.5 mph)	140	280
Weight lifting (general light workout)	110	220
Stretching	90	180
Vigorous Physical Activity	Approximate Calories/30 Minutes for a 154 lb Person1	Approximate Calories/Hr for a 154 lb Person1
Running/jogging (5 mph)	295	590
Bicycling (>10 mph)	295	590
Swimming (slow freestyle laps)	255	510
Aerobics	240	480
Walking (4.5 mph)	230	460
Heavy yard work (chopping wood)	220	440
Weight lifting (vigorous effort)	220	440
Basketball (vigorous)	220	440
1Calories burned per hour will be higher for persons who weigh more than 154 lbs (70 kg) and lower for persons who weigh less. Source: Adapted from Dietary Guidelines for Americans 2005, page 16, Table 4.

To help estimate the intensity of your physical activity, see Measuring Physical Activity Intensity.

Want to learn more?

Getting Started with Physical Activity for a Healthy Weight
If you've not been physically active in a while, you may be wondering how to get started again. Lace up those sneakers and find some motivating ideas.

Resources: Centers For Disease Control & Prevention http://www.cdc.gov 

Keeping The Weight Off

If you've recently lost excess weight, congratulations! It's an accomplishment that will likely benefit your health now and in the future. Now that you've lost weight, let's talk about some ways to maintain that success.
The following tips are some of the common characteristics among people who have successfully lost weight and maintained that loss over time.¹

• Watch Your Diet
• Be Active
• Stay on Course

Watch Your Diet

• Follow a healthy and realistic eating pattern. You have embarked on a healthier lifestyle, now the challenge is maintaining the positive eating habits you've developed along the way. In studies of people who have lost weight and kept it off for at least a year, most continued to eat a diet lower in calories as compared to their pre-weight loss diet.² 
• Keep your eating patterns consistent. Follow a healthy eating pattern regardless of changes in your routine. Plan ahead for weekends, vacations, and special occasions. By making a plan, it is more likely you'll have healthy foods on hand for when your routine changes.
• Eat breakfast every day. Eating breakfast is a common trait among people who have lost weight and kept it off. Eating a healthful breakfast may help you avoid getting "over-hungry" and then overeating later in the day.

Be Active

• Get daily physical activity. People who have lost weight and kept it off typically engage in 60—90 minutes of moderate intensity physical activity most days of the week while not exceeding calorie needs. This doesn't necessarily mean 60—90 minutes at one time. It might mean 20—30 minutes of physical activity three times a day. For example, a brisk walk in the morning, at lunch time, and in the evening. Some people may need to talk to their healthcare provider before participating in this level of physical activity.

Stay on Course

• Monitor your diet and activity. Keeping a food and physical activity journal can help you track your progress and spot trends. For example, you might notice that your weight creeps up during periods when you have a lot of business travel or when you have to work overtime. Recognizing this tendency can be a signal to try different behaviors, such as packing your own healthful food for the plane and making time to use your hotel's exercise facility when you are traveling. Or if working overtime, maybe you can use your breaks for quick walks around the building.
• Monitor your weight. Check your weight regularly. When managing your weight loss, it's a good idea to keep track of your weight so you can plan accordingly and adjust your diet and exercise plan as necessary. If you have gained a few pounds, get back on track quickly.
• Get support from family, friends, and others. People who have successfully lost weight and kept it off often rely on support from others to help them stay on course and get over any "bumps." Sometimes having a friend or partner who is also losing weight or maintaining a weight loss can help you stay motivated.

Want to learn more?

Improving Your Eating Habits
Your eating habits may be leading to weight gain; for example, eating too fast, always clearing your plate, eating when you not hungry and skipping meals (or maybe just breakfast).
Physical Activity for a Healthy Weight
Regular physical activity is important for good health, and it's especially important if you're trying to lose weight or to maintain a healthy weight.

References

¹National Weight Control Registry The National Weight Control Registry (NWCR) was developed to identify and investigate the characteristics of individuals who have succeeded at long-term weight loss. The NWCR is tracking over 5,000 individuals who have lost significant amounts of weight and kept it off for long periods of time.
²Wing RR, Phelan S. Long-term weight loss maintenance. Am J Clin Nutr 2005;82(suppl):222S-5S.

Resources: Centers For Disease Control & Prevention http://www.cdc.gov 

Improving Your Eating Habits

When it comes to eating, we have strong habits. Some are good ("I always eat breakfast"), and some are not so good ("I always clean my plate"). Although many of our eating habits were established during childhood, it doesn't mean it's too late to change them.
Making sudden, radical changes to eating habits such as eating nothing but cabbage soup, can lead to short term weight loss. However, such radical changes are neither healthy nor a good idea, and won't be successful in the long run. Permanently improving your eating habits requires a thoughtful approach in which you Reflect, Replace, and Reinforce.

• REFLECT on all of your specific eating habits, both bad and good; and, your common triggers for unhealthy eating.
• REPLACE your unhealthy eating habits with healthier ones.
• REINFORCE your new, healthier eating habits.

Reflect, Replace, Reinforce: A process for improving your eating habits

1. Create a list of your eating habits. Keeping a food diary for a few days, in which you write down everything you eat and the time of day you ate it, will help you uncover your habits. For example, you might discover that you always seek a sweet snack to get you through the mid-afternoon energy slump. It's good to note how you were feeling when you decided to eat, especially if you were eating when not hungry. Were you tired? Stressed out?
2. Highlight the habits on your list that may be leading you to overeat. Common eating habits that can lead to weight gain are:

• Eating too fast
• Always cleaning your plate
• Eating when not hungry
• Eating while standing up (may lead to eating mindlessly or too quickly)
• Always eating dessert
• Skipping meals (or maybe just breakfast)

3. Look at the unhealthy eating habits you've highlighted. Be sure you've identified all the triggers that cause you to engage in those habits. Identify a few you'd like to work on improving first. Don't forget to pat yourself on the back for the things you're doing right. Maybe you almost always eat fruit for dessert, or you drink low-fat or fat-free milk. These are good habits! Recognizing your successes will help encourage you to make more changes.
4. Create a list of "cues" by reviewing your food diary to become more aware of when and where you're "triggered" to eat for reasons other than hunger. Note how you are typically feeling at those times. Often an environmental "cue", or a particular emotional state, is what encourages eating for non-hunger reasons.
   
   Common triggers for eating when not hungry are:

• Opening up the cabinet and seeing your favorite snack food.
• Sitting at home watching television.
• Before or after a stressful meeting or situation at work.
• Coming home after work and having no idea what's for dinner.
• Having someone offer you a dish they made "just for you!"
• Walking past a candy dish on the counter.
• Sitting in the break room beside the vending machine.
• Seeing a plate of doughnuts at the morning staff meeting.
• Swinging through your favorite drive-through every morning.
• Feeling bored or tired and thinking food might offer a pick-me-up.

5. Circle the "cues" on your list that you face on a daily or weekly basis. Going home for the Thanksgiving holiday may be a trigger for you to overeat, and eventually, you want to have a plan for as many eating cues as you can. But for now, focus on the ones you face more often.
   
6. Ask yourself these questions for each "cue" you've circled:

• Is there anything I can do to avoid the cue or situation? This option works best for cues that don't involve others. For example, could you choose a different route to work to avoid stopping at a fast food restaurant on the way? Is there another place in the break room where you can sit so you're not next to the vending machine?
• For things I can't avoid, can I do something differently that would be healthier? Obviously, you can't avoid all situations that trigger your unhealthy eating habits, like staff meetings at work. In these situations, evaluate your options. Could you suggest or bring healthier snacks or beverages? Could you offer to take notes to distract your attention? Could you sit farther away from the food so it won't be as easy to grab something? Could you plan ahead and eat a healthy snack before the meeting?

7. Replace unhealthy habits with new, healthy ones. For example, in reflecting upon your eating habits, you may realize that you eat too fast when you eat alone. So, make a commitment to share a lunch each week with a colleague, or have a neighbor over for dinner one night a week. Other strategies might include putting your fork down between bites or minimizing other distractions (i.e. watching the news during dinner) that might keep you from paying attention to how quickly — and how much — you're eating.
   Here are more ideas to help you replace unhealthy habits:

• Eat more slowly. If you eat too quickly, you may "clean your plate" instead of paying attention to whether your hunger is satisfied.
• Eat only when you're truly hungry instead of when you are tired, anxious, or feeling an emotion besides hunger. If you find yourself eating when you are experiencing an emotion besides hunger, such as boredom or anxiety, try to find a non-eating activity to do instead. You may find a quick walk or phone call with a friend helps you feel better.
• Plan meals ahead of time to ensure that you eat a healthy well-balanced meal.

8. Reinforce your new, healthy habits and be patient with yourself. Habits take time to develop. It doesn't happen overnight. When you do find yourself engaging in an unhealthy habit, stop as quickly as possible and ask yourself: Why do I do this? When did I start doing this? What changes do I need to make? Be careful not to berate yourself or think that one mistake "blows" a whole day's worth of healthy habits. You can do it! It just takes one day at a time!

Want to learn more?

Losing Weight
What is healthy weight loss and why should you bother?
Getting Started
Check out some steps you can take to begin!
Keeping the Weight Off
Losing weight is the first step. Once you've lost weight, you'll want to learn how to keep it off.

Resources: Centers For Disease Control & Prevention http://www.cdc.gov 

Getting Started With Weight Loss

Losing weight takes more than desire. It takes commitment and a well-thought-out plan. Here's a step-by-step guide to getting started.

• Step 1: Make a commitment.
• Step 2: Take stock of where you are.
• Step 3: Set realistic goals.
• Step 4: Identify resources for information and support.
• Step 5: Continually "check in" with yourself to monitor your progress.

Step 1: Make a commitment.

Making the decision to lose weight, change your lifestyle, and become healthier is a big step to take. Start simply by making a commitment to yourself. Many people find it helpful to sign a written contract committing to the process. This contract may include things like the amount of weight you want to lose, the date you'd like to lose the weight by, the dietary changes you'll make to establish healthy eating habits, and a plan for getting regular physical activity.

Writing down the reasons why you want to lose weight can also help. It might be because you have a family history of heart disease, or because you want to see your kids get married, or simply because you want to feel better in your clothes. Post these reasons where they serve as a daily reminder of why you want to make this change.

Step 2: Take stock of where you are.

Consider talking to your health care provider. He or she can evaluate your height, weight, and explore other weight-related risk factors you may have. Ask for a follow-up appointment to monitor changes in your weight or any related health conditions.

Keep a "food diary" for a few days, in which you write down everything you eat. By doing this, you become more aware of what you are eating and when you are eating. This awareness can help you avoid mindless eating.

Next, examine your current lifestyle. Identify things that might pose challenges to your weight loss efforts. For example, does your work or travel schedule make it difficult to get enough physical activity? Do you find yourself eating sugary foods because that's what you buy for your kids? Do your coworkers frequently bring high-calorie items, such as doughnuts, to the workplace to share with everyone? Think through things you can do to help overcome these challenges.

Finally, think about aspects of your lifestyle that can help you lose weight. For example, is there an area near your workplace where you and some coworkers can take a walk at lunchtime? Is there a place in your community, such as a YMCA, with exercise facilities for you and child care for your kids?

Step 3: Set realistic goals.

Set some short-term goals and reward your efforts along the way. If your long-term goal is to lose 40 pounds and to control your high blood pressure, some short-term eating and physical activity goals might be to start eating breakfast, taking a 15 minute walk in the evenings, or having a salad or vegetable with supper.

Focus on two or three goals at a time. Great, effective goals are —

• Specific
• Realistic
• Forgiving (less than perfect)

For example, "Exercise More" is not a specific goal. But if you say, "I will walk 15 minutes, 3 days a week for the first week," you are setting a specific and realistic goal for the first week.

Remember, small changes every day can lead to big results in the long run. Also remember that realistic goals are achievable goals. By achieving your short-term goals day-by-day, you'll feel good about your progress and be motivated to continue. Setting unrealistic goals, such as losing 20 pounds in 2 weeks, can leave you feeling defeated and frustrated.

Being realistic also means expecting occasional setbacks. Setbacks happen when you get away from your plan for whatever reason – maybe the holidays, longer work hours, or another life change. When setbacks happen, get back on track as quickly as possible. Also take some time to think about what you would do differently if a similar situation happens, to prevent setbacks.

Keep in mind everyone is different – what works for someone else might not be right for you. Just because your neighbor lost weight by taking up running, doesn't mean running is the best option for you. Try a variety of activities – walking, swimming, tennis, or group exercise classes to see what you enjoy most and can fit into your life. These activities will be easier to stick with over the long term.

Step 4: Identify resources for information and support.

Find family members or friends who will support your weight loss efforts. Making lifestyle changes can feel easier when you have others you can talk to and rely on for support. You might have coworkers or neighbors with similar goals, and together you can share healthful recipes and plan group exercise.

Joining a weight loss group or visiting a health care professional such as a registered dietitian, can help.

Step 5: Continually "check in" with yourself to monitor your progress.

Revisit the goals you set for yourself (in Step 3) and evaluate your progress regularly. If you set a goal to walk each morning but are having trouble fitting it in before work, see if you can shift your work hours or if you can get your walk in at lunchtime or after work. Evaluate which parts of your plan are working well and which ones need tweaking. Then rewrite your goals and plan accordingly.

If you are consistently achieving a particular goal, add a new goal to help you continue on your pathway to success.

Reward yourself for your successes! Recognize when you're meeting your goals and be proud of your progress. Use non-food rewards, such as a bouquet of freshly picked flowers, a sports outing with friends, or a relaxing bath. Rewards help keep you motivated on the path to better health.

Want to learn more?

Losing Weight
What is healthy weight loss and why should you bother?
Improving Your Eating Habits
Your eating habits may be leading to weight gain; for example, eating too fast, always clearing your plate, eating when you're not hungry and skipping meals (or maybe just breakfast).
Keeping the Weight Off
Losing weight is the first step. Once you've lost weight, you'll want to learn how to keep it off.

Resources: Centers For Disease Control & Prevention http://www.cdc.gov