Abstract details

Abstract-ID: 2025
Title of the paper: Developing a field-test for force-velocity profiling in older adults
Authors: Bochicchio, G., Ferrari, L., Bottari, A., Scarton, A., Pogliaghi, S.
Institution: University of Verona
Department: Neurosciences, Biomedicine and Movement Sciences
Country: Italy
Abstract text INTRODUCTION:
Muscle function is a marker of current and prospective health and mobility throughout life and in ageing. Force-velocity profiling (F-V) evaluates muscle function through the identification of maximum force (F0), velocity (V0) and power (P0). To assess this relationship, Isokinetic Dynamometry is the laboratory gold standard. However, the high cost, request of specialized personnel and the un-physiological contraction pattern that does not resemble that of real life, have triggered the search for more applicable alternatives. The 5 Sit to Stand Test (5STS) is a multi-joint, close chain and functional test widely used in clinical setting to assess muscle power of the lower limbs. In its original version the test does not permit the characterization of F-V. Therefore, the purpose of this study was to use a modified version of the 5STS (m5STS) to characterize muscle function in older adults. To this aim, we compared F0, V0 and P0 from m5STS and isokinetic knee extension (ISO).
METHODS:
Forty-one older adults (20 females: 63,5±3,7 years) performed 5STS in four different load conditions (Bodyweight, +12.5%, +25% and +37.5% of Bodyweight) in random order. The position of a marker placed on the subject’s trochanter was monitored by Motion Capture (MOCAP) and, for each subject and trial, the mean concentric velocity (ascending phase of the movement) was extrapolated. In addition, each subjects performed isokinetic tests at 5 different velocities (60, 90, 150, 180 and 210 °/sec, in random order). Individual F-V relationships were built for both tests and F0 (corresponding to the null velocity), V0 (corresponding to null force) and P0 (corresponding to maximum power) were calculated. A correlation coefficient for the individual F-V relationships was calculated for both methods. Comparison between the above variables from m5STS test and ISO were evaluated by paired t-test and correlation.
RESULTS:
Mean correlation coefficients from ISO (-0.97 ± 0.05) and m5STS test (-0.96 ± 0.06) showed strong within-individual relationships and were not different between methods. The group mean value of F0 (m5STS: 1952.29 ± 594.16 [N]; ISO= 310.92 ± 84.45 [N]), V0 (m5STS: 0.91 ± 0.22 [m*s-1]; ISO= 3.03 ± 0.42 [m*s-1]), P0 (m5STS: 431.83 ± 127.97 [W]; ISO= 233,64 ± 65,00 [W]) were significantly different (p<0.001) as is expected for bilateral vs single-limb exercises. Linear regression showed moderate correlation between F0m5STS and F0ISO (r= 0,55) and high correlation between P0 m5STS and P0ISO (r= 0,81).
CONCLUSION:
The m5STS proposed in our study is a simple, submaximal, time- and cost-efficient test to evaluate lower limb muscle function in older adults of both sexes. The high correlation coefficients of both methods for individual F-V relationships and the strong correlation between values of P0, indicate a good ability of m5STS to correctly characterize muscle function, making it a promising tool for the large-scale assessment and monitoring muscle function in ageing.
Topic: Training and Testing
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