Key result
Caffeine lowers 24-hour post-exercise SBP by ~8 mmHg vs placebo in Paralympic powerlifters.
Why the study?
Caffeine is used to improve performance but tends to interfere with blood pressure and heart rate; its hemodynamic effects during Paralympic powerlifting needed evaluation.
Does caffeine supplementation alter hemodynamic indicators in Paralympic weightlifting athletes performing resistance exercise?
RCT (n=14)
Blinded
Randomized
No
Does caffeine supplementation alter hemodynamic indicators in Paralympic weightlifting athletes performing resistance exercise?
Standardized Mean Difference: 2.73
Absolute Event Rate: 125% vs 133%
p-value: p=0.048
Caffeine supplementation at 9 mg/kg in Paralympic powerlifters increases acute hemodynamic responses without posing significant cardiovascular risks.
Supports short-term hemodynamic safety of 9 mg/kg caffeine in male Paralympic powerlifters; hypothesis-generating and requires larger trials for confirmation.
Exercise, including resistance exercise with high loads, has positive hemodynamic responses such as reduced systolic blood pressure (SBP), diastolic blood pressure (DBP), heart rate (HR), Pressure Product Rate (PPR), and estimated myocardial oxygen volume (MVO2). Caffeine (CA), used to improve performance, tends to interfere with BP and HR. This study aimed to analyze the effects of CA supplementation on hemodynamic indicators in Paralympic weightlifting (PP). The exercise was performed on 14 male athletes (32.4 ± 8.5 years; 81.7 ± 21.9 kg) for three weeks. Two conditions were evaluated: supplementation with CA Anhydrous 9 mg/kg and with placebo (PL). The adapted bench press was used, with 5 × 5 at 80% 1RM. We evaluated BP, HR, PPR, and MVO2, before, after, 5, 10, 20, 30, 40, 50, 60 min, and 24 h later. The CA presented higher absolute values in the pressure indicators than the PL, and after 24 h there was an inversion. The HR was higher in the CA and showed a reduction after 10 min. The PPR and MVO2 in the CA presented absolute values greater than the PL, and 24 h later there was an inversion. There was no hypotensive effect, but the use of CA did not present risks related to PPR and MVO2, demonstrating the safe use of this supplement in adapted strength sports.
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Menezes et al. (2022) conducted an RCT in Lower limb disabilities (Paralympic powerlifting athletes) (n=14). Caffeine Anhydrous vs. Placebo was evaluated on Systolic blood pressure (SBP) at 24 hours post-exercise (Cohen's d 2.73, p=0.048). Caffeine supplementation of 9 mg/kg in male Paralympic powerlifting athletes did not induce a hypotensive effect but was safe regarding cardiovascular overload, resulting in significantly lower systolic blood pressure at 24 hours compared to placebo (125 vs 133 mmHg, p=0.048).
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