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Beta-Adrenergic Receptor Blockade Effects on Cardio-Pulmonary Exercise Testing in Healthy Young Adults: A Randomized, Placebo-Controlled Trial

Sports Medicine - Open volume 8, Article number: 150 (2022) Cite this article

Abstract

Background

Beta-blockers are increasingly prescribed while the effects of beta-adrenergic receptor blockade on cardio-pulmonary exercise test (CPET)-derived parameters remain under-studied.

Methods

Twenty-one young healthy adults repeated three CPET at the same time with an interval of 7 days between each test. The tests were performed 3 h after a random, double-blind, cross-over single-dose intake of placebo, 2.5 mg or 5.0 mg bisoprolol, a cardio-selective beta1-adrenoreceptor antagonist. Gas exchange, heart rate (HR) and blood pressure (BP) were measured at rest and during cyclo-ergometric incremental CPET.

Results

Maximal workload and VO2max were unaffected by the treatment, with maximal respiratory exchange ratio > 1.15 in all tests. A beta-blocker dose-dependent effect reduced resting and maximal BP and HR and the chronotropic response to exercise, evaluated by the HR/VO2 slope (placebo: 2.9 ± 0.4 beat/ml/kg; 2.5 mg bisoprolol: 2.4 ± 0.5 beat/ml/kg; 5.0 mg bisoprolol: 2.3 ± 0.4 beat/ml/kg, p < 0.001). Ventilation efficiency measured by the VE/VCO2 slope and the ventilatory equivalent for CO2 at the ventilatory threshold were not affected by beta1-receptor blockade. Post-exercise chronotropic recovery measured after 1 min was enhanced under beta1-blocker (placebo: 26 ± 7 bpm; 2.5 mg bisoprolol: 32 ± 6 bpm; 5.0 mg bisoprolol: 33 ± 6 bpm, p < 0.01).

Conclusion

The present results suggest that a single dose of bisoprolol does not affect metabolism, respiratory response and exercise capacity. However, beta-adrenergic blockade dose dependently reduces exercise hemodynamic response by lowering BP and the chronotropic response.

Introduction

Beta-blockers are a class of pharmacological competitive antagonists of the adrenergic beta-receptors of the sympathetic nervous system allowing for a smoothened endogenous catecholamines response [1]. Beta-blockers are frequently prescribed in coronary artery disease (CAD), congestive heart failure (CHF) [2], cardiac arrhythmias, congenital heart disease, but also for essential tremor [3, 4].

Cardio-pulmonary exercise testing (CPET) in chronic heart disease or in apparently healthy subject with unexplained dyspnea is increasingly promoted [5]. CPET provides a quantitative and qualitative characterization of the oxygen transport system, involving the pulmonary, cardiovascular and muscular oxidative systems [6], with direct measurement of primary outcome variables related to survival and adverse events (Class1-evidence A); aerobic capacity (VO2max), minute ventilation/carbon dioxide output slope (VE/VCO2) and exercise oscillatory ventilation [6, 7]. Notwithstanding, CPET also assess important secondary outcome variables whose independence in predicting clinical outcome has not yet been consistently reported. These parameters include the oxygen pulse [oxygen consumption (VO2) vs heart rate (HR) ratio] used as a surrogate for the left ventricular stroke-volume at exercise, the systolic blood pressure (SBP) or the HR vs VO2 slope measuring the chronotropic response to exercise [7, 8]. These secondary outcome variables are additional prognostic predictors of the risk for future adverse events in pathological conditions and in apparently healthy individuals. The chronotropic response to exercise is also widely used for exercise intensity quantification in the context of rehabilitation.

Beta-blockers intake has unequivocally been demonstrated to produce a 20—30% reduction in resting and maximal HR in healthy subjects [9,10,11,12]. A compensatory increase in stroke volume through intrinsic cardiac regulation, however, prevents a cardiac output alteration [13,14,15]. An increase in arteriovenous oxygen content difference (CavO2) has also been suggested to prevent a large decrease in VO2 during exercise [13,14,15]. While previous studies in healthy individuals showed trivial influence of beta-blocker intake on VO2max and on the ventilatory threshold (VT) level, controversial effects were described on CPET secondary outcome variables [11, 15,16,17]. The previous conflicting results in heathy subjects may be attributed to the beta-blocker agent, type, posology, intake duration, unknown pathology, fitness level, or additional confounding factors.

We hypothesized that a pharmacological specific beta1-blockade will negatively affect the chronotropic response to exercise and recovery of healthy subjects which could affect the primary and secondary outcome CPET-derived variables. In a prospective double-blind cross-over observational study, we investigated the effects of an acute administration of a high selective beta-blocker (bisoprolol) in normal young subjects on the primary and secondary outcome CPET variables. This is of importance since effects of bisoprolol on primary or secondary outcome CPET parameters may lead to inappropriate interpretation of CPET and misjudgment of mortality risk as those parameters are included in mortality risk calculation algorithms [4].

Methods

Twenty-six active healthy volunteers recruited on the University Campus participated to the study. The study was approved by the local Institutional Ethics Committee (P2019/504). All participants were recruited from 02/2020 to 04/2020 and gave their written consent. All volunteers were nonsmokers and did not declare any health problems. Their clinical examinations were unremarkable and none of them took any drugs. Their electrocardiograms were normal. Finally, twenty-one subjects were allowed to participate in the study (men) and fully completed the protocol with no drop-out (Table 1).

Table 1 Baseline characteristics
Full size table

Participants underwent a baseline clinical examination followed by a CPET on a cyclo-ergometer on three occasions at the Erasmus Hospital, Brussels with maximum 5 to 7 days of rest between each trial. All three tests were performed at the same time of the day. Subjects were asked to maintain their daily activity levels, maintain their diet habits and abstained from energy or caffeinated drinks for 24 h before testing.

A randomized, double-blind (subject and CPET operator), crossover, placebo-controlled design was conducted, with subjects receiving a sequence of 2.5 mg bisoprolol or 5.0 mg bisoprolol or placebo, strictly 3 h before the beginning of the tests [18]. Hémifumarate of bisoprolol was chosen for its competitive antagonist characteristics conferring a high degree of cardio-selective β-adrenergic receptor blockade with a maximal effect 3 h after intake [18]. 2.5 mg is the minimum initial clinical dose prescribed for heart failure patients but also for patients with atrial fibrillation, as they are prescribed once-daily and do not require dose adjustment in patients with renal impairment. A 5.0 mg dose was also tested to assess the effect of extended β-adrenergic inhibition.

Clinical Examination

A preliminary screening visit included a full medical history and a physical examination. Subjects were defined as healthy based on the following criteria: (i) no history of acute or chronic disease; (ii) no history of cardiovascular symptoms; (iii) normal blood parameters; (iv) no intake of antioxidant compounds or other medication except for oral contraceptive; and (v) BP and HR within normal limits. Resting BP (by a sphygmomanometer, Medisoft Ergoline 4 M, Hasselt, Belgium), ECG (by electrocardiographic lead; Strässle & CO DT100, Albstadt, Germany) and oxygen saturation (SpO2) (measurements of SpO2 by pulse oximetry; Nonin 8000S, Tilburg, The Netherlands) were measured during the screening visit and repeated before each experimental session. To avoid excessive bradycardia or hypotension, five subjects with resting HR < 60 bpm or mean BP < 70 mmHg without medication were excluded from the study. In the 21 remaining subjects, no side effects or adverse events were reported before, during and after CPET under placebo or bisoprolol.

Cardio-Pulmonary Exercise Testing

The cycle ergometer CPET were performed in an upright position as previously reported with a warm-up of 3 min set at 60 W for men and 30 W for women and workload increased by 30 W/min for men and 20 W/min for women until volitional fatigue [19]. The recovery period consisted in pedaling at 60 round per minute at 60 W for men and 30 W for women for 2 min. BP was measured automatically by an electronic sphygmomanometer (Ergoselect 200, Ergoline, Bitz, Germany) at each level of exercise, HR was continuously monitored with a 12-lead electrocardiogram and SpO2 were continuously monitored.

During the three exercise testing sessions, breath by breath data of VE, VO2 and VCO2 were collected and analyzed every 5 s using a metabolic recording system (HypAir, Medisoft, Dinant, Belgium) calibrated with room air and standardized gas before each test. VO2max was considered to be achieved when the respiratory exchange ratio (RER) was greater than 1.15. The VT was measured by the V-slope method. The VE/VCO2 ratio was measured at the VT [6]. The VO2/workload slope and the HR/VO2 slope were calculated from rest to maximal exercise. The VE/VCO2 slope was calculated from rest to the respiratory compensation point as recommended [6]. Maximal voluntary ventilation (MVV) was calculated as forced expiratory volume in one second (FEV1) multiplied by 40 and was considered as the limit of the ventilatory reserve [6]. Maximal O2 pulse was found by dividing the VO2max by maximal HR. Chronotropic index (CI) was calculated as (HRmax-HRrest)/[(220-age)-HRrest] [20]. HR recovery (HRR) was the difference between maximal HR and HR measured after one and two minutes of recovery.

Statistics

Results are presented as mean ± standard deviation (SD). The statistical analysis consisted of a repeated measured analysis of variance, with modified t tests (Bonferroni) to compare different β-blockers doses when the F-ratio of the analysis of variance reached a p < 0.05 critical value. Statistical analysis was performed using Statistica (Statistica version 10, StatSoft, Tulsa, USA).

Results

Rest

The effect of placebo or different bisoprolol doses intake on resting hemodynamic parameters is shown in Table 1. 2.5 mg bisoprolol intake decreased resting HR by 14 bpm and SBP by 11 mmHg with no statistical influence on diastolic BP (DBP), while 5.0 mg bisoprolol reduced resting HR by 20 bpm, SBP by 18 mmHg and DBP by 8 mmHg. SpO2 remained unaffected.

Ventilatory Threshold

As exposed in Table 2, the VT level did not differ between the three pharmacological conditions with unchanged workload, absolute VO2 (L/min) or VO2 relative to VO2max (% VO2max) and the VE/VCO2 ratio. However, the intake of bisoprolol dose dependently reduced HR, SBP and DBP at this submaximal exercise level.

Table 2 Cardio-pulmonary exercise variables after bisoprolol vs placebo
Full size table

Maximal Exercise

All exercise tests reached a metabolic maximality with end exercise RER systematically exceeding 1.15 (Table 2).

Maximal SBP, DBP and HR were decreased by β1-receptor blockade as compared to the placebo condition with an increased effect after 5.0 mg of bisoprolol compared to 2.5 mg (Fig. 1). HR/VO2 slope and CI also decreased with the use of bisoprolol (2.5 and 5.0 mg) (Figs. 2 and 3). 2.5 mg or 5.0 mg bisoprolol increased maximal O2 pulse (Table 2). Bisoprolol had no effect on maximal VE, workload, VO2, SpO2 and on the VE/VCO2 or VO2/W slopes.

Fig. 1
figure 1

Chronotropic response during and after an incremental exercise. Heart rate (HR) measurements were reported at rest, at the ventilatory threshold, at maximal exercise, after 1 and 2 min of recovery. The slope of the HR vs oxygen consumption (VO2) measured during CPET is negatively impacted by the intake of 2.5 or 5.0 mg of bisoprolol (dose response). Bisoprolol also increased the HR recovery after 1 min (difference between maximal HR and HR measured 1 min after the end of maximal exercise), but not after 2 min under β1-blockade compared to placebo. No difference between 2.5 and 5.0 mg of acute bisoprolol intake were observable

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Fig. 2
figure 2

Individual CPET derived HR/VO2 slopes measured in healthy subjects under placebo, 2.5 mg bisoprolol or 5.0 mg of bisoprolol. Mean values are represented by large horizontal bars and standard deviation by vertical bars in each condition. B1 adrenoreceptors blockade negatively affected the HR/VO2 slope

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Fig. 3
figure 3

Calculated chronotropic index (CI) in healthy subjects under placebo, 2.5 mg bisoprolol or 5.0 mg of bisoprolol. Mean values are represented by large horizontal bars and standard deviation by vertical bars in each condition. 7 subjects out of 21 (33%) under 5.0 mg of bisoprolol are included in the chronotropic incompetence zone (grey zone) situated below a chronotropic index of 0.6

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End Exercise Recovery

β1-blockade had no effect on gas exchange or ventilatory parameters during the recovery period (not shown). However, enhanced chronotropic recovery was observable with the use of bisoprolol (2.5 and 5.0 mg) within the first minute post-exercise but returned to normal at 2 min of recovery (Table 2).

Discussion

β-blocker is a commonly used drug class whose influence remains under-considered in the interpretation of CPET. In the present study, acute inhibition of cardio-specific β-adrenoreceptors had no effect on aerobic capacity or ventilatory response during exercise in healthy subjects. Preserved VO2max was possible since the β-blockers negative chronotropic and inotropic effects, assessed by lower resting and maximal HR and SBP with a 18% reduction in the HR/VO2 slope, was counter-balanced by increased O2 pulse probably through intrinsic cardiac and/or peripheral adaptative mechanisms. The present result also revealed a 23% increase in the early chronotropic recovery within the first end-exercise minute.

Beta-Blockade

The bisoprolol dose used in the present study respected the recommendations when initiating a treatment titrated to effect [21]. How much body-weight titration would have influenced the present results is unknown. After 2.5 mg bisoprolol, 97% of the subjects showed a clear chronotropic inhibition, > 10 bpm, indicating effective starting dose.

With 5 mg of bisoprolol, all subjects decrease HR at rest with no bradycardiac adverse events reported. 76% of the subjects reached the minimal tolerated HR (70 bpm) suggesting achievement of the target dose. It remains unknown if higher doses would have been more efficient the 24% other subjects.

Aerobic Capacity

Previous studies reported either an unchanged or a 5–7% VO2max alteration after 1 or 2 weeks of β-blocker intake [16, 17]. No altered VO2max was observed in the present study in accordance with other studies on healthy young subjects [22, 23], aortic aneurysm [14], or hypertension patients [24]. This general observation made in healthy or pathological conditions suggests that the negative inotropic and chronotropic effects of β-blocker promote multiple compensatory-dependent mechanisms such as; mechanical/intrinsic cardiac adaptation and/or according to Fick’s principle, enhanced O2 extraction in exercising muscles, etc. [15].

Chronotropic Response to Exercise

HR response to exercise is multi-factorial and depends on autonomic outflows (central command), reflex responses to skeletal muscle activation (exercise pressor reflex), hemodynamic changes, sinus node function, parasympathetic withdrawal and β-adrenoreceptor responsiveness [20]. At the onset of exercise, chronotropic response mainly depends on para-sympathetic drive reduction. Further exercising allows the catecholamines to stimulate nodal cells and cardiomyocytes β1-receptors which will in turn modify the membrane permeability to K+ and Ca++ resulting in increased cardiomyocytes excitability, frequency of excitation, impulse conduction and relaxation speed [20]. Pharmacological inhibition of the β1-receptors will therefore attenuate all those cardiac adrenergic responses during exercise and might also participate to the smoothened SBP response at exercise [20].

Chronotropic Index

Chronotropic incompetence, defined as the inability of the HR to increase during exercise, is diagnosed using the chronotropic index, the HR/VO2 slope or when the measured maximal HR does not reach 80% of the predicted maximal HR [20, 25].

Numerous studies showed an altered chronotropic index under chronic and acute β-blockers intakes [25,26,27]. However, the chronotropic index has also been shown to be inversely correlated to mortality in healthy men [28], congenital heart disease [29]. Also in patients with HF treated with β-blockers, an index below 0.6 increased mortality of + 17% at 24 months [30]. As illustrated in Fig. 3, 7 healthy subjects out of 21 (33%) showed a chronotropic index < 0.6 after 5.0 mg of bisoprolol intake. Hence in some circumstances, the chronotropic index might be more affected by the treatment than by the disease itself.

HR/VO2 Slope

The HR vs metabolism relationship, namely the HR/VO2 or HR/MET slopes, also evaluates the chronotropic response to exercise with the advantage to be physical fitness level independent. Normal values of HR/VO2 are between 3 to 4 b/ml/kg in healthy sedentary subjects [6] and is known to be influenced by age, sex, physical fitness or altitude [23, 31, 32]. The HR/VO2 slope is increased in cardiac affections such as Fontant patients (not on beta-blockers) or atrial septal defect and reduced in patients with heart failure with preserved ejection fraction treated by beta-blockers [33,34,35]. The presently healthy subjects exhibited a decreased HR/VO2 slope after bisoprolol intake reaching the lower limit of normal independently of the prescribed dose (Fig. 2). Our study highlights that a drug-related reduction in the HR/VO2 slope (average decrease of 0.5 b/ml/kg) has to be taken into account during CPET analysis, when beta-blockers are prescribed, at least acutely.

Chronotropic Post-Exercise Kinetics

HRR is often reported as an indirect estimation of cardio-vascular fitness. Indeed, HRR is enhanced in endurance athletes as compared to resistive training athletes [20]. Conversely, a delayed HRR, particularly when < 12 bpm decrease is observed within the first minute after maximal exercise, is associated with increased all-cause mortality in asymptomatic subjects and in pathological populations such as HF, chronic obstructive pulmonary disease or interstitial lung disease [6, 8, 36, 37]. Indeed, this early recovery phase is highly dependent on the reactivation of the parasympathetic tone, while later (slow recovery phase), HRR is influenced by the reduction of sympathetic activity and non-autonomic factors (α-adrenergic tone, atrial stretch or central temperature changes) [38].

The present increased HRR at 1 min post-exercise suggest that acute β1-adrenergic blockade may allow for an enhanced cardiac vagal reactivation. However, the involvement of non-autonomic mechanisms cannot be excluded [38].

Oxygen Pulse

IN the present study, maximal O2 pulse, a composite index reflecting maximal stroke volume and end-exercise peripheral O2 extraction, was increased by the intake of β1-blocker independently of the drug dose. As end-exercise peripheral O2 extraction has been shown to be unaltered following B1-selective blockade [12], increased maximal O2 pulse may reflect a decreased systemic resistance or left ventricular afterload and an intrinsic cardiac adaptation after β-adrenergic receptor blockade, resulting from the Frank-Starling mechanism when ventricular filling time is increased.

β1-selective blockade is also known to preserve the β2-receptor induced muscular vasodilation during exercise with one study reporting a 4% increase in end exercise CavO2 of CAD patients [13]. This suggests that this peripheral adaptation may partially contribute to the increased maximal O2 pulse and the VO2max preservation under β1-blockade.

Gas Exchange and Chemosensibility

The present result showed no influence of bisoprolol intake on the ventilatory response to exercise, preserving maximal ventilation but also ventilatory efficiency evaluated by the VE/VCO2 ratio at VT or the VE/VCO2 slope. This suggests little or no interference of β1-adrenergic effects on central or peripheral chemo-receptors or muscle metabo-receptors during exercise [39]. However, Beloka et al. previously showed smoothened VE/VCO2 slopes after chronic intake of bisoprolol in healthy subjects [17]. Because this was not associated with detectable changes in the sympathetic nervous system tone, metabosensitivity or chemosensitivity, the authors attributed the lower VE/VCO2 slopes to underlying hemodynamic mechanisms. Other studies showing lower hyperventilation response under β-blockers were realized under un-specific β blockade, suggesting an involvement of β2-adrenoreceptors rather than β1-receptors in the ventilatory response to exercise [39].

Clinical Relevance

From a clinically point of view, the present study highlights a potential risk of misinterpretation of CPET in subjects on beta-blockers. Firstly, it is interesting to note that VO2max is not or hardly affected by beta-blocker intake. Secondly, the maximal O2pulse value will be overestimated due to the negative chronotropic effect suggesting a cautious and contextualized interpretation. Thirdly, the chronotropic response to exercise (assessed by the chronotropic index or HR/VO2 slope) is reduced by an average of 0.5 b/mL/kg and should be taken into account in the interpretation, especially when the value approaches the limit of chronotropic incompetence (< 3 b/mL/kg). Finally, the pharmacologically-induced HRR acceleration with bisoprolol should be included in the interpretation of the recovery phase.

Limitation of the Study

There are several limitations in the present study that could have affected the results or conclusions. All tested subjects were healthy active young adults. The extrapolation of the present results to older subjects or to patient with cardiac diseases remains therefore uncertain. It is also important to underly that five subjects were precautionary excluded for high reactivity to bisoprolol with bradycardia and hypotension. This thus constitutes an inclusion bias in the present study.

Moreover, the present observed effects are the consequence of an acute β-blocker dose intake and it remains uncertain if more β1-receptors would be inhibited with a chronic β-blocker treatment or higher doses and if it would influence the present results.

Also, young men and women were recruited in the present study sample, but sex influence on chronotropic response under beta-blockade remains unknown. Although no sex differences appeared after an inter-sex comparison (not shown), a sex influence cannot be excluded in older or pathological populations.

Conclusion

In conclusion, even if acute β-blocker intake has little or no influence on aerobic capacity, it however affects the chronotropic response to exercise, by lowering the chronotropic index or the HR/VO2 slope and increasing the HR recovery during the first min post-exercise.

This should be taken into consideration during CPET interpretation for prognostic establishments, follow-up but also for HR-based exercise titration. As a general recommendation, this study and previous evidence suggest CPET should be performed only under chronic stabilized beta-blockers therapy in order to facilitate the interpretation of the results.

Availability of Data and Materials

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

BMI:

Body mass index

CAD:

Coronary artery disease

CavO2 :

Arteriovenous oxygen content difference

CHF:

Congestive heart failure

CI:

Chronotropic index

CPET:

Cardio-pulmonary exercise testing

DBP:

Diastolic blood pressure

HR:

Heart rate

HRR:

Heart rate recovery

MVV:

Maximal voluntary ventilation

RER:

Respiratory exchange ratio

SBP:

Systolic blood pressure

SD:

Standard deviation

SpO2 :

Pulsed oxygen saturation

VE:

Ventilation

VO2 :

Oxygen consumption

VT:

Ventilatory threshold

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Acknowledgements

The authors wish to acknowledge Mr Wartel Anthony and Mr Dochen François for their help.

Funding

Dr Chaumont and Mr Gillet were supported by “Fonds Erasme pour la recherche médicale” of the Erasmus Hospital, Brussels.

Author information

Authors and Affiliations

  1. Cardio-Pulmonary Exercise Laboratory, Faculty of Motor Sciences, Université Libre de Bruxelles, Erasme Campus CP 604, 808 Lennik Road, 1070, Brussels, Belgium

    Kevin Forton, Alexis Gillet, Martin Chaumont & Vitalie Faoro

  2. Department of Cardiology, Erasmus University Hospital, Université Libre de Bruxelles, Brussels, Belgium

    Kevin Forton, Michel Lamotte, Alexis Gillet, Martin Chaumont & Philippe van de Borne

Authors
  1. Kevin Forton
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  2. Michel Lamotte
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  3. Alexis Gillet
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  4. Martin Chaumont
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  5. Philippe van de Borne
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  6. Vitalie Faoro
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Contributions

Significant manuscript writer: KF/VF. Significant manuscript reviewer/reviser: KF/ML/AG/MC/PV/VF. Concept and design: KF/ML/PV/VF. Data acquisition: KF/AG/MC. Data analysis and interpretation: KF/ML/AG/MC/PV/VF. Statistical expertise: KF/VF. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Kevin Forton.

Ethics declarations

Ethics Approval and Consent to Participate

The study was conducted in accordance with the Declaration of Helsinki. The Ethics Committees approved all experiments and procedures (Erasme Hospital Ethical Committee: P2019/504). All participants provided written informed consent.

Consent for Publication

Not applicable.

Competing Interests

The authors have no conflicts of interests to declare.

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Forton, K., Lamotte, M., Gillet, A. et al. Beta-Adrenergic Receptor Blockade Effects on Cardio-Pulmonary Exercise Testing in Healthy Young Adults: A Randomized, Placebo-Controlled Trial. Sports Med - Open 8, 150 (2022). https://doi.org/10.1186/s40798-022-00537-5

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Keywords

  • Bisoprolol
  • Exercise aerobic capacity
  • Chronotropic response