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Altarawneh MM, Petersen A, Smith R, Rouffet DM, Billaut F, Perry BD, Wyckelsma VL, Tobin A, McKenna MJ. Salbutamol effects on systemic potassium dynamics during and following intense continuous and intermittent exercise. Eur J Appl Physiol 2016; 116:2389-2399. [PMID: 27771799 DOI: 10.1007/s00421-016-3481-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Accepted: 09/22/2016] [Indexed: 11/27/2022]
Abstract
PURPOSE Salbutamol inhalation is permissible by WADA in athletic competition for asthma management and affects potassium regulation, which is vital for muscle function. Salbutamol effects on arterial potassium concentration ([K+]a) during and after high-intensity continuous exercise (HIcont) and intermittent exercise comprising repeated, brief sprints (HIint), and on performance during HIint are unknown and were investigated. METHODS Seven recreationally active men participated in a double-blind, randomised, cross-over design, inhaling 1000 µg salbutamol or placebo. Participants cycled continuously for 5 min at 40 % [Formula: see text]O2peak and 60 % [Formula: see text]O2peak, then HIcont (90 s at 130 % [Formula: see text]O2peak), 20 min recovery, and then HIint (3 sets, 5 × 4 s sprints), with 30 min recovery. RESULTS Plasma [K+]a increased throughout exercise and subsequently declined below baseline (P < 0.001). Plasma [K+]a was greater during HIcont than HIint (P < 0.001, HIcont 5.94 ± 0.65 vs HIint set 1, 4.71 ± 0.40 mM); the change in [K+]a from baseline (Δ[K+]a) was 2.6-fold greater during HIcont than HIint (P < 0.001). The Δ[K+] throughout the trial was less with salbutamol than placebo (P < 0.001, treatment main effect, 0.03 ± 0.67 vs 0.22 ± 0.69 mM, respectively); and remained less after correction for fluid shifts (P < 0.001). The Δ[K+] during HIcont was less after salbutamol (P < 0.05), but not during HIint. Blood lactate, plasma pH, and the work output during HIint did not differ between trials. CONCLUSIONS Inhaled salbutamol modulated the [K+]a rise across the trial, comprising intense continuous and intermittent exercise and recovery, lowering Δ[K+] during HIcont. The limited [K+]a changes during HIint suggest that salbutamol is unlikely to influence systemic [K+] during periods of intense effort in intermittent sports.
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Affiliation(s)
- Muath M Altarawneh
- Institute of Sport, Exercise and Active Living (ISEAL), Clinical Exercise Science Research Program, Victoria University, PO Box 14428, Melbourne, VIC, 8001, Australia
| | - Aaron Petersen
- Institute of Sport, Exercise and Active Living (ISEAL), Clinical Exercise Science Research Program, Victoria University, PO Box 14428, Melbourne, VIC, 8001, Australia
| | - Robert Smith
- Institute of Sport, Exercise and Active Living (ISEAL), Clinical Exercise Science Research Program, Victoria University, PO Box 14428, Melbourne, VIC, 8001, Australia
- Department of Anaesthesia, Western Hospital, Melbourne, Australia
| | - David M Rouffet
- Institute of Sport, Exercise and Active Living (ISEAL), Clinical Exercise Science Research Program, Victoria University, PO Box 14428, Melbourne, VIC, 8001, Australia
| | - Francois Billaut
- Institute of Sport, Exercise and Active Living (ISEAL), Clinical Exercise Science Research Program, Victoria University, PO Box 14428, Melbourne, VIC, 8001, Australia
- Département de Kinésiologie, Université Laval, Québec, Canada
| | - Ben D Perry
- Institute of Sport, Exercise and Active Living (ISEAL), Clinical Exercise Science Research Program, Victoria University, PO Box 14428, Melbourne, VIC, 8001, Australia
| | - Victoria L Wyckelsma
- Institute of Sport, Exercise and Active Living (ISEAL), Clinical Exercise Science Research Program, Victoria University, PO Box 14428, Melbourne, VIC, 8001, Australia
| | - Antony Tobin
- Intensive Care Unit, St Vincent's Hospital, Melbourne, Australia
| | - Michael J McKenna
- Institute of Sport, Exercise and Active Living (ISEAL), Clinical Exercise Science Research Program, Victoria University, PO Box 14428, Melbourne, VIC, 8001, Australia.
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