Modeling trajectories of perceived leg exertion during maximal cycle ergometer exercise in children and adolescents

BMC Medical Research Methodology

Paolo Pianosi²  Patrick McGrath¹  Terry Therneau³  Zhen Zhang⁴  Marianne Huebner³ 

[1] Departments of Psychology, Pediatrics, and Psychiatry, Dalhousie University, Halifax, NS, B3H 4J1, Canada;Department of Pediatric and Adolescent Medicine, Mayo Clinic, Rochester, MN, USA;Department of Health Sciences Research, Mayo Clinic, Rochester, MN, USA;Department of Statistics and Probability, Michigan State University, East Lansing, MI, USA

关键词: Power model;    Delay;    Ergometer exercise;    Borg scale;    Perceived leg exertion;    Children;   

Others  :  866511
DOI  :  10.1186/1471-2288-14-4

 received in 2013-09-13, accepted in 2013-12-16,  发布年份 2014

【 摘 要 】

Background

Borg developed scales for rating pain and perceived exertion in adults that have also been used in pediatric populations. Models describing functional relationships between perceived exertion and work capacity have not been studied in children. We compared different models and their fits to individual trajectories and assessed the variability in these trajectories.

Methods

Ratings of perceived exertion (RPE) were collected from 79 children. Progressive cycle ergonometric testing was performed to maximal work capacity with test duration ranging from 6‐ 12 minutes. Ratings were obtained during each 1‐minute increment. Work was normalized to individual maximal work capacity (Wmax). A delay was defined as the fraction of Wmax at which point an increase in ratings of leg fatigue occurred. Such a delay term allows the characterization of trajectories for children whose ratings were initially constant with increasing work. Two models were considered, a delay model and a power model that is commonly used to analyze Borg ratings. Individual model fit was assessed with root mean squared error (RMSE). Functional clustering algorithms were used to identify patterns.

Results

Leg tiredness developed quickly for some children while for others there was a delay before an in‐ creased ratings of leg exertion occurred with increasing work. Models for individual trajectories with the smallest RMSE included a delay and a quadratic term (quadratic‐delay model), or a power function and a delay term (power‐delay model) compared to a simple power function. The median delay was 40% Wmax (interquartile range (IQR): 26‐49%) in a quadratic‐delay model, while the median exponent was 1.03 (IQR: 0.83‐1.78) in a power‐delay model. Nine clusters were identified showing linear or quadratic patterns with or without a delay. Cluster membership did not depend on age, gender or diagnosis.

Conclusion

Children and adolescents vary widely in their capacity to rate their perceptions and exhibit different functional relationships between ratings of perceived exertion and work capacity normalized across individuals. Models including a delay term, a linear component, or a power function can describe these individual trajectories of perceived leg exertion during incremental exercise to voluntary exhaustion.

【 授权许可】

   
2014 Huebner et al.; licensee BioMed Central Ltd.

【 图 表 】

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