The Claim
An intense 3-week preparatory training period reduces high-intensity intermittent exercise capacity by approximately 7.4% in elite female U20 footballers, as measured by the YoYo IR1 test, regardless of beta-alanine supplementation.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Elite female football players under 20 who undergo three weeks of intense training show a 7.4% decrease in their ability to perform high-intensity intermittent exercise, as measured by the YoYo IR1 test, whether or not they take beta-alanine.
See the scientific wording
An intense 3-week preparatory training period significantly reduces high-intensity intermittent exercise capacity by approximately 7.4% in elite female U20 footballers, as measured by the YoYo IR1 test, regardless of beta-alanine supplementation.
After intense training, muscles accumulate waste products that make it harder for nerves to activate muscle fibers fully, so the body can't sustain repeated high-speed efforts as well.
What the research says
1 studyA study found that after three weeks of tough training, teenage female footballers got 7.4% worse at doing repeated sprints — and taking a common endurance supplement didn't help them avoid this drop.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.