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- Title
Rate of force development as a measure of muscle damage.
- Authors
Peñailillo, L.; Blazevich, A.; Numazawa, H.; Nosaka, K.
- Abstract
This study tested the hypothesis that rate of force development ( RFD) would be a more sensitive indirect marker of muscle damage than maximum voluntary isometric contraction ( MVC) peak torque. Ten men performed one concentric cycling and two eccentric cycling ( ECC1, ECC2) bouts for 30 min at 60% of maximal concentric power output with 2 weeks between bouts. MVC peak torque, RFD, and vastus lateralis electromyogram amplitude and mean frequency were measured during a knee extensor MVC before, immediately after and 1-2 days after each bout. The magnitude of decrease in MVC peak torque after exercise was greater ( P < 0.05) for ECC1 (11-25%) than concentric cycling (2-12%) and ECC2 (0-16%). Peak RFD and RFD from 0-30 ms, 0-50 ms, 0-100 ms, to 0-200 ms decreased ( P < 0.05) immediately after all cycling bouts without significant differences between bouts, but RFD at 100-200 ms interval ( RFD100-200) decreased ( P < 0.05) at all time points after ECC1 (24-32%) and immediately after ECC2 (23%), but did not change after CONC. The magnitude of decrease in RFD100-200 was 7-19% greater than that of MVC peak torque after ECC1 ( P < 0.05). It is concluded that RFD100-200 is a more specific and sensitive indirect marker of eccentric exercise-induced muscle damage than MVC peak torque.
- Subjects
DIAGNOSIS of musculoskeletal system diseases; ANALYSIS of variance; STATISTICAL correlation; CYCLING; ELECTROMYOGRAPHY; FISHER exact test; KNEE; LONGITUDINAL method; MUSCLE contraction; PROBABILITY theory; TORQUE; SAMPLE size (Statistics); DATA analysis software; SKELETAL muscle
- Publication
Scandinavian Journal of Medicine & Science in Sports, 2015, Vol 25, Issue 3, p417
- ISSN
0905-7188
- Publication type
Article
- DOI
10.1111/sms.12241