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Ángel Aceña Rodriguez

@acea_ngel • 20,514 subscribers

Rehab & RTP coach @Udinese_1896 / Serie A🇮🇹,Premier League🏴󠁧󠁢󠁥󠁮󠁧󠁿,La Liga🇪🇸,Eredivise🇳🇱,FIFA WorldCup 2018 🇷🇺,African Cup Nations 2019 🇪🇬

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Recent research shows importance of analysis of high accelerations (>2m/s) starting from relative high speeds (>85% max speed- >25 Km/h) in hamstring injuries and between 30-40m. Not all hamstring injuries occurs during maximal speed and not all high accelerations (from stopped or very low intensities ) are the most “dangerous” for players. Combination of starting from high relative speeds and high accelerations could be indicative of more severe injuries prognosis.

Recent research shows importance of analysis of high accelerations (>2m/s) starting from relative high speeds (>85% max speed- >25 Km/h) in hamstring injuries and between 30-40m. Not all hamstring injuries occurs during maximal speed and not all high accelerations (from stopped or very low intensities ) are the most “dangerous” for players. Combination of starting from high relative speeds and high accelerations could be indicative of more severe injuries prognosis.

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Eccentric duration during CMJ as a metric for monitoring and detecting neuromuscular fatigue 24-48h 🪫post game ? 🚨Jump Height ?? The main finding of the study was that during the late regeneration phase (48 hours post-baseline), fatigued players may select a movement strategy to accomplish the output driven goal of jumping for height. ⬇️⏱️Ecc duration ?? The changes displayed in the time related variables (⬆️EccDur, ConDur and TotDur), in conjunction with a return to baseline for JH at 48 hours post- baseline, suggests that an alternative movement strategy was adopted to complete the task, albeit in a mechanical inefficient manner 📚 Kennedy, R., & Drake, D. (2017). The effect of acute fatigue on countermovement jump performance in rugby union players during preseason. Journal of Sports Medicine and Physical Fitness, 57(10), 1261-1266.

Eccentric duration during CMJ as a metric for monitoring and detecting neuromuscular fatigue 24-48h 🪫post game ? 🚨Jump Height ?? The main finding of the study was that during the late regeneration phase (48 hours post-baseline), fatigued players may select a movement strategy to accomplish the output driven goal of jumping for height. ⬇️⏱️Ecc duration ?? The changes displayed in the time related variables (⬆️EccDur, ConDur and TotDur), in conjunction with a return to baseline for JH at 48 hours post- baseline, suggests that an alternative movement strategy was adopted to complete the task, albeit in a mechanical inefficient manner 📚 Kennedy, R., & Drake, D. (2017). The effect of acute fatigue on countermovement jump performance in rugby union players during preseason. Journal of Sports Medicine and Physical Fitness, 57(10), 1261-1266.

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𝘾𝙈𝙅 𝙖𝙣𝙙 𝙛𝙖𝙩𝙞𝙜𝙪𝙚 𝙢𝙤𝙣𝙞𝙩𝙤𝙧𝙞𝙣𝙜, 𝙬𝙝𝙚𝙣 𝙅𝙪𝙢𝙥 𝙃𝙚𝙞𝙜𝙝𝙩 (𝙘𝙢) 𝙖𝙡𝙤𝙣𝙚 𝙞𝙨 𝙣𝙤𝙩 𝙩𝙝𝙚 𝙗𝙚𝙨𝙩 𝙢𝙚𝙩𝙧𝙞𝙘 𝙩𝙤 𝙙𝙚𝙩𝙚𝙘𝙩 𝙣𝙚𝙪𝙧𝙤𝙢𝙪𝙨𝙘𝙪𝙡𝙖𝙧 𝙛𝙖𝙩𝙞𝙜𝙪𝙚 𝙞𝙣 𝙤𝙪𝙧 𝙖𝙩𝙝𝙡𝙚𝙩𝙚𝙨 👇🏼 1️⃣Jump Height and fatigue ? Not clear evidence …. Cormack et al. observed altered flight time to contraction time ratio up to 2 days after elite competition “despite little changes in jump height performance” Different movement solutions occur to maintain a desired “performance” metric such as jump height or power output Legg et al. suggested that altering CMJ mechanics assisted with maintenance of jump height while in a fatigued state, with changes in dip magnitude observed midseason despite no change in jump height. 2️⃣RSI-mod as an alternative variable ?? CMJ height alone may not always discriminate between rugby league cohorts, emphasizing the requirement for the associated underpinning force-time variables [to indicate jump ‘strategy’], or RSImod at the very least McMahon et al. reported that a group of combined professional senior SL and RLC rugby league players who performed the CMJ with a “higher RSImod” demonstrated higher force, velocity and thus power outputs. 3️⃣Sensitive to change of different metrics , Jump Height 🆚 RSI-mod? CMJ height was not sensitive to change in neuromuscular status of elite Australian Rules Football athletes pre- to post-match, from 48-hours pre- to 48-hours post-match 📌Conclusions - RSImod or FT:CT may prove more useful overall as an indicator of readiness, slow SSC activity, and neuromuscular fatigue as they impact the coordinative strategy and jumping performance. - A decline of 8% in FT:CT or RSImod would indicate a change requiring intervention as at this level of neuromuscular fatigue there are considerable changes to performance 📚 📕Hughes, S., Warmenhoven, J., Haff, G. G., Chapman, D. W., & Nimphius, S. (2022). Countermovement jump and squat jump force-time curve analysis in control and fatigue conditions. The Journal of Strength & Conditioning Research, 36(10), 2752-2761. 📗McMahon, J. J., Jones, P. A., & Comfort, P. (2022). Comparison of countermovement jump–derived reactive strength index modified and underpinning force-time variables between super league and championship rugby league players. The Journal of Strength & Conditioning Research, 36(1), 226-231. 📘Martinez, D. B. (2016). THE USE OF REACTIVE STRENGTH INDEX, REACTIVE STRENGTH INDEX MODIFIED, AND FLIGHT TIME: CONTRACTION TIME AS MONITORING TOOLS. Journal of Australian Strength & Conditioning, 24(5) 📘Bishop, C., Jordan, M., Torres-Ronda, L., Loturco, I., Harry, J., Virgile, A., ... & Comfort, P. (2023). Selecting metrics that matter: comparing the use of the countermovement jump for performance profiling, neuromuscular fatigue monitoring, and injury rehabilitation testing. Strength & Conditioning Journal, 45(5), 545-553.

𝘾𝙈𝙅 𝙖𝙣𝙙 𝙛𝙖𝙩𝙞𝙜𝙪𝙚 𝙢𝙤𝙣𝙞𝙩𝙤𝙧𝙞𝙣𝙜, 𝙬𝙝𝙚𝙣 𝙅𝙪𝙢𝙥 𝙃𝙚𝙞𝙜𝙝𝙩 (𝙘𝙢) 𝙖𝙡𝙤𝙣𝙚 𝙞𝙨 𝙣𝙤𝙩 𝙩𝙝𝙚 𝙗𝙚𝙨𝙩 𝙢𝙚𝙩𝙧𝙞𝙘 𝙩𝙤 𝙙𝙚𝙩𝙚𝙘𝙩 𝙣𝙚𝙪𝙧𝙤𝙢𝙪𝙨𝙘𝙪𝙡𝙖𝙧 𝙛𝙖𝙩𝙞𝙜𝙪𝙚 𝙞𝙣 𝙤𝙪𝙧 𝙖𝙩𝙝𝙡𝙚𝙩𝙚𝙨 👇🏼 1️⃣Jump Height and fatigue ? Not clear evidence …. Cormack et al. observed altered flight time to contraction time ratio up to 2 days after elite competition “despite little changes in jump height performance” Different movement solutions occur to maintain a desired “performance” metric such as jump height or power output Legg et al. suggested that altering CMJ mechanics assisted with maintenance of jump height while in a fatigued state, with changes in dip magnitude observed midseason despite no change in jump height. 2️⃣RSI-mod as an alternative variable ?? CMJ height alone may not always discriminate between rugby league cohorts, emphasizing the requirement for the associated underpinning force-time variables [to indicate jump ‘strategy’], or RSImod at the very least McMahon et al. reported that a group of combined professional senior SL and RLC rugby league players who performed the CMJ with a “higher RSImod” demonstrated higher force, velocity and thus power outputs. 3️⃣Sensitive to change of different metrics , Jump Height 🆚 RSI-mod? CMJ height was not sensitive to change in neuromuscular status of elite Australian Rules Football athletes pre- to post-match, from 48-hours pre- to 48-hours post-match 📌Conclusions - RSImod or FT:CT may prove more useful overall as an indicator of readiness, slow SSC activity, and neuromuscular fatigue as they impact the coordinative strategy and jumping performance. - A decline of 8% in FT:CT or RSImod would indicate a change requiring intervention as at this level of neuromuscular fatigue there are considerable changes to performance 📚 📕Hughes, S., Warmenhoven, J., Haff, G. G., Chapman, D. W., & Nimphius, S. (2022). Countermovement jump and squat jump force-time curve analysis in control and fatigue conditions. The Journal of Strength & Conditioning Research, 36(10), 2752-2761. 📗McMahon, J. J., Jones, P. A., & Comfort, P. (2022). Comparison of countermovement jump–derived reactive strength index modified and underpinning force-time variables between super league and championship rugby league players. The Journal of Strength & Conditioning Research, 36(1), 226-231. 📘Martinez, D. B. (2016). THE USE OF REACTIVE STRENGTH INDEX, REACTIVE STRENGTH INDEX MODIFIED, AND FLIGHT TIME: CONTRACTION TIME AS MONITORING TOOLS. Journal of Australian Strength & Conditioning, 24(5) 📘Bishop, C., Jordan, M., Torres-Ronda, L., Loturco, I., Harry, J., Virgile, A., ... & Comfort, P. (2023). Selecting metrics that matter: comparing the use of the countermovement jump for performance profiling, neuromuscular fatigue monitoring, and injury rehabilitation testing. Strength & Conditioning Journal, 45(5), 545-553.

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“Se es atleta las 24h del día” … cuidar el 22+2 = cuidarse 22h para rendir 2 Antonio Jesus Bores Cerezal 👤+🥙+🫂+😴 ENTRENAMIENTO INVISIBLE 🎞️🎥Netflix “Sprint: los humanos más veloces”

Ángel Aceña Rodriguez

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