Abstract
Purpose
The purpose of the present study was to investigate the effect of high-dose inhaled terbutaline on muscle strength, maximal sprinting, and time-trial performance in trained men.
Methods
Nine non-asthmatic males with a \(\dot{V}O_{2max}\) of 58.9 ± 3.1 ml min−1 kg−1 (mean ± SEM) participated in a double-blinded randomized crossover study. After administration of inhaled terbutaline (30 × 0.5 mg) or placebo, subjects’ maximal voluntary isometric contraction (MVC) of m.quadriceps was measured. After MVC, subjects performed a 30-s Wingate test. Sixty minutes following the Wingate test, subjects exercised for 10 min at 80 % of \(\dot{V}O_{2max}\) and completed a 100-kcal time trial. Aerobic contribution was determined during the Wingate test by indirect calorimetry. Furthermore, plasma terbutaline, lactate, glucose, and K+ were measured.
Results
Inhalation of 15 mg terbutaline resulted in systemic concentrations of terbutaline of 23.6 ± 1.1 ng ml−1 30 min after administration, and elevated plasma lactate (P = 0.001) and glucose (P = 0.007). MVC was higher for terbutaline than placebo (738 ± 64 vs. 681 ± 68 N) (P = 0.007). In addition, Wingate peak power and mean power were 2.2 ± 0.8 (P = 0.019) and 3.3 ± 1.0 % (P = 0.009) higher for terbutaline than placebo. Net accumulation of plasma lactate was higher (P = 0.003) for terbutaline than placebo during the Wingate test, whereas \(\dot{V}O_{2}\) above baseline was unchanged by terbutaline (P = 0.882). Time-trial performance was not different between treatments (P = 0.236).
Conclusion
High-dose inhaled terbutaline elicits a systemic response that enhances muscle strength and sprint performance. High-dose terbutaline should therefore continue to be restricted in competitive sport.
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Abbreviations
- ANOVA:
-
Analysis of the variance
- AUC:
-
Area under the curve
- MVC:
-
Maximal voluntary Contraction
- RER:
-
Respiratory exchange ratio
- \(\dot{V}O_{2}\) :
-
Oxygen uptake
- \(\dot{V}O_{2max}\) :
-
Maximal oxygen uptake
- WADA:
-
World Anti-doping Agency
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The study was supported by a grant from the World Anti-doping Agency (WADA).
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Communicated by Nicolas Place.
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Hostrup, M., Kalsen, A., Bangsbo, J. et al. High-dose inhaled terbutaline increases muscle strength and enhances maximal sprint performance in trained men. Eur J Appl Physiol 114, 2499–2508 (2014). https://doi.org/10.1007/s00421-014-2970-2
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DOI: https://doi.org/10.1007/s00421-014-2970-2