Summary
Obesity derives from an extended period of positive energy imbalance due to a complex interplay of environmental and biological factors. Muscle fiber type and physiology have been hypothesized to affect metabolism and energy expenditure and thus to affect an individual's propensity to gain weight. However, there have been conflicting reports regarding a relationship between muscle fiber type and obesity. Here, we systematically reviewed literature investigating this topic from PubMed, Web of Science, and EMBASE. Of these, 32 articles were included in our final review and analysis. Most studies (22/32) reported a significant relationship between muscle fiber‐type proportion and a measure of obesity. Overall, there was a significant negative relationship between the proportion of type I fibers and body mass index (BMI) and a significant positive relationship between the proportion of type IIX fibers and BMI. Moreover, between‐group comparisons indicated a greater prevalence of type IIX fibers and a lower prevalence of type I fibers in patients living with obesity relative to lean individuals. These significant relationships were confirmed in a meta‐analysis of these data. The causal nature of these associations remains to be evaluated.
Background
The number of pediatric SOT recipients surviving into adulthood is increasing. Thus, understanding their psychosocial and QoL outcomes is important. We conducted a systematic review to collate existing literature examining QoL outcomes (physical functioning, psychological functioning, social functioning), as well as risk and protective factors associated with QoL, among adults who underwent SOT during childhood.
Methods
A systematic search of five databases, from inception to January 6, 2021, was conducted to identify articles that reported on QoL outcomes for adults (≥18‐year of age) who received a SOT during childhood (<19‐year of age).
Results
Twenty‐five articles met inclusion criteria. Studies examined QoL across a range of SOT populations (liver, kidney, heart). QoL and psychosocial outcomes were variable; however, the majority of studies indicated QoL in this population to be similar to the general population, or at least similar to other chronic illness groups, with the exception of physical and social functioning. Factors related to a more optimal medical course, younger age at transplant and follow‐up, and positive psychosocial functioning, were found to be predictive of better QoL outcomes.
Conclusions
While several studies indicated QoL to be similar to the general population, the literature is limited in both quantity and quality. No study employed prospective, longitudinal methodologies to systematically evaluate QoL over time and few studies utilized normative‐based measures of QoL. Furthermore, several SOT groups were under‐represented in the literature (e.g., lung, intestine, multi‐visceral). Nonetheless, findings have implications for intervention and clinical decision‐making.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.