Premium
Reproducibility and relationship of single‐joint strength vs multi‐joint strength and power in aging individuals
Author(s) -
Holsgaard Larsen A.,
Caserotti P.,
Puggaard L.,
Aagaard P.
Publication year - 2007
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/j.1600-0838.2006.00560.x
Subject(s) - isometric exercise , reproducibility , hamstring , concentric , knee joint , joint (building) , medicine , coefficient of variation , vertical jump , hamstring muscles , physical medicine and rehabilitation , orthodontics , physical therapy , jump , mathematics , surgery , structural engineering , statistics , geometry , physics , quantum mechanics , engineering
Reliable and sensitive muscle strength/power assessments are essential when evaluating age‐related and/or training‐induced changes in maximal strength and power. Aim: To investigate the reproducibility and inter‐relationship of single‐joint isokinetic/isometric leg muscle strength vs multi‐joint mechanical muscle function during counter‐movement jump (CMJ) in moderately trained aging individuals (age 72.3±6.6). Results: The within‐subject coefficient of variation (CV w‐s ) for the single‐joint test showed good reproducibility (<10%) for quadriceps and hamstring strength (except for hamstring isometric). Plantar flexion demonstrated good to moderate reproducibility (CV w‐s range: 10.4–17.2%). Excellent to good CV w‐s (<10%) was observed for all concentric CMJ parameters, except for plantar flexor mean work (CV w‐s =13%). Eccentric CMJ parameters demonstrated good to moderate reproducibility (CV w‐s range: 8.1–18.2%). Isokinetic and isometric quadriceps, hamstring and plantar flexor single‐joint strength measurements were found to correlate with several CMJ parameters. Conclusion: Single‐joint and multi‐joint strength and power assessment tests of the lower limbs appear to be reproducible in aging individuals. Furthermore, associations between single‐joint strength and multi‐joint CMJ power and force variables exist. To evaluate functional capacity in elderly people further investigations must be carried out to identify specific power/strength parameters that are most tightly linked to functional performance.