Modality-Specific Muscle Low-Frequency Fatigue and Recovery Signatures: A Case Report Mapping the HIIT Science Taxonomy
Researchers Buchheit and Laursen used the Myocene Powerdex device to track low‑frequency fatigue before, after, and up to 48 hours following nine HIIT sessions spanning the HIIT Science taxonomy. The data confirmed the presumed hierarchy: Type 1 (Zone 2 sauna bike) caused negligible fatigue, Type 2 (easy small‑sided games) produced a moderate drop recovering within 24 hours, Type 4 (repeated sprint agility) yielded a severe drop below 80 % with recovery beyond 48 hours, while Type 3‑5 (cycling SIT) showed a sharp acute decline that rebounded within four hours. Neuromuscular RPE correlated strongly (r = ‑0.89) with Powerdex changes, outperforming global RPE and heart‑rate metrics.
Jump Height Lies: Force–Time CMJ Metrics Reveal Hidden Neuromuscular Responses in Elite Football
A new study of elite footballers measured countermovement jumps 48 hours after matches and found jump height unchanged across all levels of match exposure. However, force‑time metrics—early concentric impulse, modified RSI, peak concentric force, and contraction time—showed significant declines or increases,...