Exercise in Children: “Exercise is a Family Affair”
Evonne Kaplan-Liss
Mary Ellen Renna
INTRODUCTION
As noted throughout this book, the hard part of regular exercise is the “regular” and not the exercise. This is even truer for the pediatric population than it is for the adult population. Children are dependent on the family unit; therefore, the best chance of incorporating regular exercise into their daily lives is by making exercise a family affair. The goal of this chapter is to provide guidance to clinicians on how to counsel their pediatric patients and their families on making exercise a family affair.
This chapter discusses the importance of exercise in the pediatric population and the benefits of exercise to the entire family. The 5 As, as discussed in Chapter 2 (pp. 20-21; see also below), can be very helpful in organizing your intervention for this population. Let us recall them here: The “Five A’s Framework:” Assess, Advise, Agree, Assist, Arrange follow-up. They provide guidance on how you can effectively communicate the content of the American College of Sports Medicine’s (ACSM) children and adolescent guidelines for physical activity at various stages of a child’s development. The importance of the “new vital signs” (BMI measurements and exercise history) is stressed in this chapter and the barriers to regular family exercise are addressed. The ACSM Guidelines for the Exercise Prescription for Children and Adolescents are presented below (see pp. 232-233). They are designed to aid you in offering an exercise program that families can easily incorporate into their daily lives without the need for purchasing expensive equipment and freeing up a large amount of time. In order to ensure that regular exercise becomes a part of every family’s daily routine, as we have said throughout this book, it will be very helpful for you to use each patient encounter to reinforce the message that “Exercise IS Medicine.”
THE BENEFITS OF PHYSICAL ACTIVITY IN CHILDREN
The first step in counseling families to incorporate regular exercise into their daily routine is to inform each family about the health benefits of regular exercise, as well as about the risks associated with lack of exercise. As stated in the
ACSM’s Guidelines for Exercise Testing and Prescription (1), most children (defined as <13 yr) participate in adequate amounts of physical activity. Recent trends, however, show physical activity levels decreasing through adolescence (defined as 13-18 yr or Tanner Stage 5), such that the majority of adolescents are not participating in sufficient amounts of physical activity to meet recommended guidelines (2, 3). Physical activity, however, has been shown to reduce death rates from heart disease, colon cancer, hypertension and diabetes (4).
ACSM’s Guidelines for Exercise Testing and Prescription (1), most children (defined as <13 yr) participate in adequate amounts of physical activity. Recent trends, however, show physical activity levels decreasing through adolescence (defined as 13-18 yr or Tanner Stage 5), such that the majority of adolescents are not participating in sufficient amounts of physical activity to meet recommended guidelines (2, 3). Physical activity, however, has been shown to reduce death rates from heart disease, colon cancer, hypertension and diabetes (4).
As noted for children as well as for adults, the prevalence of physical activity has declined, while the prevalence of obesity has increased. Data from two NHANES surveys (1976-1980 and 2003-2004) show that the prevalence of obesity has almost tripled in all age groups: for children aged 2-5 years, prevalence increased from 5.0% to 13.9%; for those aged 6-11 years, prevalence increased from 6.5% to 18.8%; and for those aged 12-19 years, prevalence increased from 5.0% to 17.4% (5). Risk factors for cardiovascular disease (i.e., elevated total cholesterol, triglycerides, insulin level, and blood pressure) and Type 2 Diabetes are more common in obese children than in those of normal weight. The obesity epidemic may potentially reverse the improved life expectancy trend that has resulted from the decrease in infectious diseases during the twentieth century; today’s children may in fact have a shorter life expectancy than their parents (4). As is well-known, overweight children and adolescents are more likely to become obese adults, underscoring the magnitude of this public health problem. According to the Centers for Disease Control and Prevention (CDC), 80% of children who are overweight at 10-15 years of age are obese at age 25 (5).
It is clear that obesity has both genetic and environmental components. The environmental component is the well-known “more energy going in than being expended” factor. Clinicians may not be able to alter the genetic contribution to obesity, but they can influence the environmental contribution through nutritional and exercise counseling. (Nutrition counseling is beyond the scope of this chapter, but refer to Growing Up Healthy [7] for advice on nutrition counseling.)
Just as for adults, in addition to decreasing the risk for developing obesity and the co-morbidities associated with obesity (hypertension, heart disease, type II diabetes, arthritis, cardiomyopathy, fatty liver, and elevated triglycerides,) regular exercise in children has many other health benefits: improves bone density, especially in pre-pubertal children, helps to reduce future risk of osteoporosis, improves premenstrual syndrome, helps to reduce LDL cholesterol, and increases the heart-beneficial HDL cholesterol. Regular exercise also helps to improve muscle tone, strength, balance, and coordination.
Regular exercise has psychosocial benefits for children as well. Self-esteem improves in children who are physically active; school performance is enhanced; energy level is increased; and the risk of depression decreases through exercise’s affects on hormonal levels (8, 9). In fact, because of the amelioration of some
mood disorders with regular exercise, the exercise prescription is used by many pediatric psychiatrists to help alleviate symptoms in their patients (10). Children who are not physically active have a greater tendency to have depression and spend more time on computers, watching television, or playing video games than those who are physically active. These solitary and sedentary activities are obviously not conducive to developing a positive family environment (10). If children are engaging in regular exercise, overall harmony of the family can and will improve.
mood disorders with regular exercise, the exercise prescription is used by many pediatric psychiatrists to help alleviate symptoms in their patients (10). Children who are not physically active have a greater tendency to have depression and spend more time on computers, watching television, or playing video games than those who are physically active. These solitary and sedentary activities are obviously not conducive to developing a positive family environment (10). If children are engaging in regular exercise, overall harmony of the family can and will improve.
ACSM GUIDELINES FOR EXERCISE PRESCRIPTION FOR CHILDREN AND ADOLESCENTS (1)
Guidelines
ACSM’s exercise prescription guidelines outlined below for children and adolescents establish the minimal amount of physical activity needed to achieve the various components of health-related fitness (11).
Frequency: most days of the week, and preferably daily.
Intensity: moderate (physical activity that noticeably increases breathing, sweating, and HR) to vigorous (physical activity that substantially increases breathing, sweating, and HR) intensity.
Time: 30 minutes of moderate and 30 minutes of vigorous intensity to total 60 minutes of accumulated physical activity.
Type: a variety of activities that are enjoyable and developmentally appropriate for the child or adolescent: Activities may include walking, active play/games, dance, and sports.
As for adults, children can be encouraged to engage in either lifestyle/activities of daily living or scheduled leisure-time regular exercise or both in some combination.
Special Considerations
Children and adolescents may safely participate in strength-training activities, provided that they receive proper instruction and supervision. Generally, adult guidelines for resistance training may be applied. Eight to 15 repetitions of an exercise should be performed to the point of moderate fatigue with good mechanical form before the resistance is increased.
Because of immature thermoregulatory systems, children and adolescents should exercise in thermoneutral environments and be properly hydrated. Refer to ACSM position stands on exercising in the heat (12) and fluid replacement (13) for additional information.
Children and adolescents who are overweight or physically inactive may not be able to achieve 60 consecutive minutes of physical activity. Therefore, gradually increase the frequency and time of physical activity to achieve this goal.
Children and adolescents with diseases or disabilities such as asthma, diabetes mellitus, obesity, cystic fibrosis, and cerebral palsy should have their exercise prescriptions tailored to their condition, symptoms, and functional capacity. Refer to Chapter 10 of ACSM’s Guidelines for Exercise Testing and Prescription (1) for additional information on exercise recommendations for these diseases and conditions.
Efforts should be made to decrease sedentary activities (i.e., television watching, surfing the Internet, and playing video games) and increase activities that promote lifelong activity and fitness (i.e., walking and cycling).
EXERCISE COUNSELING AND PRESCRIPTION
Each pediatric patient encounter provides an opportunity for you to recommend regular exercise for both your patient(s) and the whole family unit. Whether the office visit is a sick or well visit, it presents an opportunity for you to ask about exercise and nutrition habits. The well visit will beneficially incorporate the measurement of “the new vital signs,” calculation of BMI and plotting of BMI percentile, as well as asking about the family’s level of physical activity. Using the “5 As” (Assess, Advise, Agree, Assist, Arrange [see Chap. 2, pp. 20-21]) can help in organizing your counseling of the family on regular exercise. Since children are “not just small adults,” it is important for you to take into consideration the developmental stage of the child or adolescent and alter the exercise prescription accordingly. Children and adolescents require special consideration when exercising as a result of growth and the immaturity of their physiologic regulatory systems at rest and during exercise. Physiologic responses to acute exercise are also different in children as compared to adults (see Table 14.1).
THE NEW VITAL SIGNS: BMI AND LEVEL OF PHYSICAL ACTIVITY
In order for you to begin incorporating regular exercise counseling into your practice, it is important to start by including “the new vital signs” in their routine vital sign screening and to learn how to interpret them. The “new vital signs” include measurement of body mass index (BMI) and level of physical activity. BMI is a measure of the weight in kilograms divided by the height in meters squared. A normal BMI based on age and sex falls between the fifth and 85th percentile when plotted on standardized BMI growth charts (14). BMI should be routinely measured and plotted at all yearly well visits. If the BMI plots above the 85th percentile, closer follow-up may be indicated.
TABLE 14.1 Physiologic Responses to Acute Exercise of Children Compared to Adults | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|