Write an exercise Rx to improve patients' cardiorespiratory fitness
Assessing physical activity is an opportunity to encourage lifestyle-based tactics for reducing cardiovascular risk. These handy tables serve as practical guides.
PRACTICE RECOMMENDATIONS
› Encourage children and adolescents (6 to 17 years of age) to engage in 60 min of moderate-to-vigorous physical activity, including aerobic, muscle-strengthening, and bone-strengthening endeavors on most, if not all, days of the week. A
› Encourage adults to perform approximately 150 to 300 min of moderate or 75 to 150 min of vigorous physical activity (or an equivalent combination) per week, along with moderate-intensity muscle-strengthening activities on ≥ 2 days per week. A
› Counsel patients that even a small (eg, 1-2 metabolic equivalents) increase in cardiorespiratory fitness is associated with a 10% to 30% lower rate of adverse events. A
Strength of recommendation (SOR)
A Good-quality patient-oriented evidence
B Inconsistent or limited-quality patient-oriented evidence
C Consensus, usual practice, opinion, disease-oriented evidence, case series
Cardiorespiratory fitness as a vital sign. In 2016, the American Heart Association (AHA) asserted the importance of assessing CRF as a clinical vital sign.12 CRF is commonly expressed as maximal oxygen consumption (VO2max = O2 mL/kg/min) and measured through cardiopulmonary exercise testing (CPET), considered the gold standard by combining conventional graded exercise testing with ventilatory expired gas analysis. CPET is more objective and precise than equations estimating CRF that are derived from peak work rate. AHA recommended that efforts to improve CRF should become standard in clinical encounters, explaining that even a small increase in CRF (eg, 1 or 2 metabolic equivalentsa [METs]) is associated with a considerably (10% to 30%) lower rate of adverse cardiovascular events.12
De Souza de Silva and colleagues revealed an association between each 1-MET increase in CRF and per-person annual health care cost savings (adjusted for age and presence of cardiovascular disease) of $3272 (normal-weight patients), $4252 (overweight), and $6103 (obese).13 In its 2016 scientific statement on CRF as a vital sign, AHA listed several methods of estimating CRF and concluded that, although CPET involves a higher level of training, proficiency, equipment, and, therefore, cost, the independent and additive information obtained justifies its use in many patients.12
CASE
Mary Q, 68 years of age, presents for an annual well-woman examination. Body mass index is 32; resting heart rate (HR), 73 bpm; and blood pressure, 126/74 mm Hg. She reports being inactive, except for light walking every day with her dog around the neighborhood, which takes them approximately 15 minutes. She denies any history or signs and symptoms of cardiovascular, metabolic, or renal disease.
You consider 3 questions before taking next steps regarding increasing Ms. Q’s activity level:
- What is her PAVS?
- Does she need medical clearance before starting an exercise program?
- What would an evidence-based cardiovascular exercise prescription for Ms. Q look like?
SBIRT: Brief intervention
When a patient does not meet the recommended level of physical activity, you have an opportunity to deliver a brief intervention. To do this effectively, you must have adequate understanding of the patient’s receptivity for change. The transtheoretical, or Stages of Change, model proposes that a person typically goes through 5 stages of growth—pre-contemplation, contemplation, preparation, action, and maintenance—in the process of lifestyle modification. This model highlights the different approaches to exercise adoption and maintenance that need to be taken, based on a given patient’s stage at the moment.
Continue to: Using this framework...
