Abstract
Purpose
The purpose of the study was to investigate the combined effect of downhill running and heat stress on muscle damage, as well as on heat strain and kidney stress during subsequent running in the heat.
Methods
In a randomized cross-over study, ten non-heat-acclimated, physically active males completed downhill running in temperate (EIMD in Temp) and hot (EIMD in Hot) conditions followed by an exercise-heat stress (HS) test after 3-h seated rest. Blood and urine samples were collected immediately pre- and post-EIMD and HS, and 24 h post-EIMD (post-24 h). Core temperature and thermal sensation were measured to evaluate heat strain. Serum creatine kinase (CK), maximal voluntary isometric contraction of the quadriceps (MVC) and perceived muscle soreness were measured to evaluate muscle damage. Urinary neutrophil gelatinase-associated lipocalin (NGAL) and kidney injury molecule-1 (KIM-1) levels were measured to indicate acute kidney stress.
Results
CK, MVC and perceived soreness were not different between conditions at any timepoints. In the EIMD in Hot condition, urinary NGAL was significantly elevated from pre- to post-HS (pre-HS: 6.56 {1.53–12.24} ng/min, post-HS: 13.72 {7.67–21.46} ng/min, p = 0.034). Such elevation of NGAL or KIM-1 was not found in the EIMD in Temp condition.
Conclusions
As compared with downhill running in a temperate environment, downhill running in a hot environment does not appear to aggravate muscle damage. However, elevated NGAL levels following EIMD in a hot environment suggest such exercise may increase risk of mild acute kidney injury during subsequent endurance exercise in the heat.
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Abbreviations
- EHS:
-
Exertional heat stroke
- EIMD:
-
Exercise-induced muscle damage
- NGAL:
-
Neutrophil gelatinase-associated lipocalin
- AKI:
-
Acute kidney injury
- KIM-1:
-
Kidney injury molecule-1
- HS:
-
Heat stress
- HR:
-
Heart rate
- RPE:
-
Rating of perceived exertion
- MVC:
-
Maximal voluntary isometric contraction
- RH:
-
Relative humidity
- CK:
-
Creatine kinase
- VAS:
-
Visual analog scale
- ELISA:
-
Enzyme-linked immunosorbent assays
- CV:
-
Coefficient of variation
- SD:
-
Standard deviation
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Funding
This study was partially funded by the Graduate and Professional Student Association and the Exercise Physiology Laboratories at the University of New Mexico (New Mexico Research Grant 2019).
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FA and ZL conceived the experiments. ZL, ZM, FCM, MK, CM and FA designed the experiments. ZL, ZM, ZF, RN, AW, JD, JH, and KM collected data. ZL and ZM analyzed data. ZL drafted the manuscript. All authors contributed to the final manuscript.
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The authors declare that they have no conflicts of interest.
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This study was approved by the Institutional Review Board at the University of New Mexico Main Campus (IRBNet ID: 1520480).
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All participants have read and signed an informed consent prior to participating in the study.
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Communicated by Narihiko Kondo.
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Li, Z., McKenna, Z., Fennel, Z. et al. The combined effects of exercise-induced muscle damage and heat stress on acute kidney stress and heat strain during subsequent endurance exercise. Eur J Appl Physiol 122, 1239–1248 (2022). https://doi.org/10.1007/s00421-022-04919-1
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DOI: https://doi.org/10.1007/s00421-022-04919-1