Abstract
Study design
Experimental study.
Objectives
To compare lipid profiles during moderate-intensity exercise between persons with cervical spinal cord injuries (SCIC) and able-bodied controls (AB).
Setting
Wakayama Medical University, Japan.
Methods
Six participants with SCIC and six AB performed 30-min arm-crank exercise at 50% VO2peak. Blood samples were collected before (PRE), immediately (POST), and 60 min after exercise (REC). Concentrations of serum free fatty acids ([FFA]s), total ketone bodies ([tKB]s), acetoacetic acid ([AcAc]s), insulin ([Ins]s), and plasma catecholamines and glucose ([Glc]p) were assessed.
Results
Catecholamine concentrations in SCIC were lower than AB throughout the experiment (P < 0.001) and remained unchanged, while increased at POST in AB (P < 0.01). [FFA]s remained unchanged in both groups with no differences between groups. [tKB]s in SCIC tended to increase at REC from PRE (P = 0.043), while remaining unchanged in AB (P > 0.42). [AcAc]s in SCIC increased at REC from PRE and POST (P < 0.01) while remaining unchanged in AB (interactions of Group × Time P = 0.014). [Glc]p and [Ins]s were comparable between the groups throughout the study.
Conclusion
Serum ketone bodies in SCIC increased after exercise while remaining unchanged in AB, suggesting that suppressed uptakes of serum ketone bodies from blood to the muscles in SCIC would partially contribute the increased serum ketones.
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Data availability
The dataset generated and analyzed during the current study is available from the corresponding author upon reasonable request.
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Acknowledgements
We thank all participants for their cooperation in our study. We also appreciate the service of Dr. Sven Hoekstra, Ph.D. from Loughborough University for kindly editing this manuscript. Grants: Mitacs-Japan Society for the Promotion of Science (JSPS) Internship program in 2017 (FT as host supervisor to JA).
Funding
This study was supported by grants from Nachikatsuura Research Foundation (L1221) to FT and also supported by funding from the Japan Society for the Promotion of Science through JSPS Postdoctoral Fellowships for Research in Japan (Summer Program; ID# SP17401; 2017).
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KN, Y-iK, YN, and FT conceived and designed research; KN, Y-iK, JSA, TM, YM, YU, KK, and TO performed the experiments; KN and Y-iK analyzed the data; KN, Y-iK, JSA, YN, and FT interpreted the results; KN prepared the figures; KN and Y-iK drafted the manuscript; all authors edited and revised the manuscript; all authors approved the final version of the manuscript.
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The study protocol and the methods applied in this study conformed to the guidelines of the Declaration of Helsinki and were approved by the Review Board on Human Experiments, Wakayama Medical University.
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Nishiyama, K., Nishimuara, Y., Au, J.S. et al. Serum concentrations of ketones increase after hand-ergometer exercise in persons with cervical spinal cord injuries: a preliminary prospective study. Spinal Cord 61, 139–144 (2023). https://doi.org/10.1038/s41393-022-00859-x
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DOI: https://doi.org/10.1038/s41393-022-00859-x