Mixed
Habitual dynamic exercise does not increase protein requirements and may improve metabolic efficiency, while resistance exercise requires increased amino acid availability post-exercise to achieve net positive protein balance.
You do not need to eat more protein just because you exercise regularly. Your body actually becomes more efficient at using protein with training. However, if you do heavy resistance training (weightlifting), you must ensure you eat enough protein after your workout to help your muscles recover and grow, because your body breaks down protein faster than it builds it immediately after the session.
There is no evidence that habitual exercise increases protein requirements; indeed protein metabolism may become more efficient as a result of training. ... After exercise, protein synthesis rebounds for <=48 h, but breakdown remains elevated, and net positive balance is achieved only if amino acid availability is increased.
Why this rating
Based on a comprehensive review of multiple studies by leading experts in the field.
Source
P<scp>ROTEIN AND</scp> A<scp>MINO</scp> A<scp>CID</scp> M<scp>ETABOLISM</scp> D<scp>URING AND</scp> A<scp>FTER</scp> E<scp>XERCISE AND THE</scp> E<scp>FFECTS OF</scp> N<scp>UTRITION</scp>
Michael J. Rennie et al. · Annual Review of Nutrition · 2000
DOI 10.1146/annurev.nutr.20.1.457
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