Abstract
Purpose
Patients with anorexia nervosa (AN) require appropriate nutrient therapy and physical activity management. Eating disorder treatment guidelines do not include safe, evidence-based intensity criteria for exercise. This study used cardiopulmonary exercise testing (CPX) to evaluate the exercise tolerance of patients with AN.
Methods
CPX was performed with 14 female patients with AN admitted to a specialized eating disorder unit between 2015 and 2019. Their anaerobic threshold (AT) was determined by assessing their exercise tolerance using CPX and compared with 14 healthy controls (HC). The metabolic equivalents (AT-METS) were compared when AT was reached. We examined factors related to AT (AN-AT) in the AN group, including age, body mass index (BMI), previous lowest weight, minimum BMI, past duration of BMI < 15, exercise history, and ΔHR (heart rate at the AT—resting heart rate).
Results
The AT of the AN group (BMI: 15.7 [Mean] ± 1.8 standard deviation [SD]) was significantly lower than that of the HC group (BMI: 19.7 ± 1.8) (AN: 10.0 ± 1.8 vs. HC: 15.2 ± 3.0 ml/kg/min, P < 0.001). AT-METS was also significantly lower in the AN group than in the HC group (AN: 2.9 ± 0.52 vs. HC: 4.4 ± 0.91, P < 0.001). AN-AT was highly influenced by ΔHR.
Conclusions
This study showed that AT and AT-METS were lower in patients with AN than in HC. Patients with AN should be prescribed light-intensity aerobic exercise, and the current findings may help develop future physical management guidelines for patients with AN.
Level of evidence
III: Evidence obtained from case–control analytic studies.
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Availability of data and materials
The data sets generated and analyzed during the current study are available from the corresponding author on reasonable request.
Code availability
Not applicable.
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Acknowledgements
We would like to acknowledge Mr. Tsurumaru for his advice and technical support regarding CPX.
We would also like to acknowledge all study participants as well as the anonymous reviewers who commented on the draft.
Funding
This study was supported by JSPS KAKENHI Grant Number JP17K09340. This work was supported in part by Grants-in-Aid for Research from the National Center for Global Health and Medicine (20A 3001) and Grants-in-Aid for Scientific Research from the Japanese Ministry of Health, Labor, and Welfare (17K09340).
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KK and NS contributed to the study conception and design. Material preparation and data collection were performed by MY, KT, CA, TS, HY, TH, and ST. Analysis was performed by MY and KK. The first draft of the manuscript was written by MY. All authors have read and approved the final manuscript.
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This study was approved by the Ethics Committee of Kyushu University (Ethical Approval Number 26–191) and the National Center for Global Health and Medicine (Ethical Approval Number NGM-G-003071–00).
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Yamashita, M., Kawai, K., Toda, K. et al. Cardiopulmonary exercise testing for patients with anorexia nervosa: a case–control study. Eat Weight Disord 27, 3553–3560 (2022). https://doi.org/10.1007/s40519-022-01492-6
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DOI: https://doi.org/10.1007/s40519-022-01492-6