Abstract：
:The history dependence of force is an intrinsic property of muscle whereby a muscle actively shortened or lengthened to an isometric steady-state produces less (residual force depression; rFD) or more force (residual force enhancement; rFE), respectively, than a purely isometric contraction at the same muscle length and level of activation. Previous studies on the modifiability of the history dependence of force have been inconclusive, and none have attempted to modify rFD and rFE through isometric resistance training biased to short vs long muscle-tendon unit (MTU) lengths. We tested maximal voluntary rFD and rFE in seven males and six females before and after 8 weeks of maximal isometric dorsiflexion training 3 days/wk. Participants trained one leg at 0° of plantar flexion (short-MTU training) and one at 40° of plantar flexion (long-MTU training). Ultrasonography of the tibialis anterior assessed resting muscle architecture. Tibialis anterior fascicle length decreased by ~3% following short-MTU training (P = .03) and increased by ~4% following long-MTU training (P = .01). rFD did not change following training at either MTU length (absolute rFD: P = .53; percent rFD: P = .51), nor did rFE (absolute rFE: P = .78; percent rFE: P = .80), with no relationships between the change in fascicle length and the change in percent rFD (R2 = .01, P = .62) nor rFE (R2 = .001, P = .88). Our data indicate that voluntary rFD and rFE were not modified by isometric training and not related to the fascicle length adaptations we observed.
journal_name
Scand J Med Sci Sportsjournal_title
Scandinavian journal of medicine & science in sportsauthors
Hinks A,Davidson B,Akagi R,Power GAdoi
10.1111/sms.13842subject
Has Abstractpub_date
2021-02-01 00:00:00pages
325-338issue
2eissn
0905-7188issn
1600-0838journal_volume
31pub_type
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