Affiliations: Department of Sport and Exercise Sciences, University of Chester, UK
Correspondence:
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Corresponding author: John Fernandes, Department of Sport and Exercise Sciences, University of Chester, Parkgate Road, Chester, CH1 4BJ, UK. Tel.: +44 01244 511988; E-mail:j.fernandes@chester.ac.uk
Abstract: BACKGROUND:
The FitroDyne has been used to assess muscle function
but its reproducibility has not been determined during traditional
multi-jointed resistance exercises. OBJECTIVE: To assess the intra-
and inter-day reproducibility of the FitroDyne during traditional resistance
exercises. METHODS: Fourteen resistance trained males completed a one
repetition maximum (1RM) and three repetitions of bench press, squat and
bent-over-row in 10% increments (from 20 to 80%). Replica trials were
completed two and 48 hours later. The FitroDyne rotary encoder measured
barbell velocity during each repetition from which power output was
calculated. RESULTS: For all loads and exercises the intra-day
typical error (TE) for peak and mean power, and velocity, respectively,
during bench press (8.2-53 W and 2.2-6.9 cm ⋅ s - 1), squat (13.3-55.6 W and 2.4-7.4 cm ⋅ s - 1), and bent-over-row
(14.5-62.8 W and 4-10.5 cm ⋅ s - 1) identified only moderate changes. Bench press yielded poor intra-day reproducibility at 80% 1RM
only (CV% = 12.2-17.1), whereas squat and bent-over-row across all loads
for peak and mean power and velocity displayed better reproducibility CV% = 2.4-9.0). Inter-day, the TE detected moderate changes for peak and mean
power and velocity for all three exercises. Inter-day reproducibility was
comparable to intra-day, though improved for bench press 80% 1RM (CV% = 6.1-8.6). CONCLUSION: These data support the use of the FitroDyne
at submaximal loads for monitoring moderate changes in muscle function both
intra- and inter-day.
