POWER – TORQUE DEPRESSION – AGING


1 RESEARCH ARTICLE


SHORTENING-INDUCED TORQUE DEPRESSION – IMPLICATIONS FOR AGE-RELATED POWER LOSS FOR >70 – 2014


Power GA1, Vandervoort AA5. et al
METHOD
– Maximal voluntary isometric dorsiflexion contractions (MVC; 10s) in 8 young (25.5±3.7yrs) and 9 old (76.1±5.4yrs) men were performed and then again following an active shortening of 40° joint excursion (40°PF-0°PF) at angular velocities of 15°/s and 120°/s
RESULTS
(1) Old were 18% weaker than young for MVC, and ~40% less powerful for 15°/s and 120°/s of shortening
(2) Old produced 37% and 21% less work for 15°/s and 120°/s than young, respectively.
(3) Old experienced 60% and 70% greater shortening induced TD than young for 15°/s and 120°/s, respectively
(4) Significant relationship b/n shortening-induced TD and instantaneous power only at fast angular velocity for both old and young
(5) The older men experienced greater shortening induced TD than young while maintaining similar levels of voluntary activation
CONCLUSION
– This previously unaccounted for history-dependent property of muscle may provide insight into power loss in old age


 

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