Abstract
Abstract: The main aim of this study was to examine the relationship between body weight, absolute
and relative strength and power variables in a flywheel Romanian deadlift. A secondary aim was to
assess the inter-day reliability of a novel power assessment protocol previously used to determine the
inertial load that produced the maximum power output in Flywheel Inertia Training. Ten physically
active males took part in this study. Participants had some experience with flywheel devices, but
all had a minimum of 24 months of traditional resistance training experience. The first testing
session consisted of three sets of 10 repetitions with a different inertial load for each set (0.050, 0.075,
and 1.00 kgm2). Each set’s first and second repetitions were used to build momentum and were
excluded from data analysis. The order of inertial load used in each trial was standardized for all
participants: first, 0.050 kgm2, second, 0.075 kgm2, and last, 0.100 kgm2. The secondary testing
session followed the same procedure as the first. No statistically significant (p < 0.05) effect was
found between any of the variables in the correlation analysis. There were large positive correlations
between the 1 repetition max flywheel Romanian deadlift and peak concentric power, relative strength,
and peak concentric and eccentric peak powers. Both body weight and relative strength showed
moderate negative correlations with % eccentric overload, whereas moderate positive correlations
were observed between 1RM and peak eccentric power. Both concentric power and eccentric power
showed excellent reliability, while the reliability for % eccentric overload ranged from poor to
excellent depending on the inertial load. In conclusion, this study shows that a protocol to assess the
maximum power output has excellent reliability for both ECC and CON power and may be used in
future flywheel training. The results also showed that body weight, maximum strength, and relative
strength were not largely related to power variables. An individualized approach to flywheel training
is required.
and relative strength and power variables in a flywheel Romanian deadlift. A secondary aim was to
assess the inter-day reliability of a novel power assessment protocol previously used to determine the
inertial load that produced the maximum power output in Flywheel Inertia Training. Ten physically
active males took part in this study. Participants had some experience with flywheel devices, but
all had a minimum of 24 months of traditional resistance training experience. The first testing
session consisted of three sets of 10 repetitions with a different inertial load for each set (0.050, 0.075,
and 1.00 kgm2). Each set’s first and second repetitions were used to build momentum and were
excluded from data analysis. The order of inertial load used in each trial was standardized for all
participants: first, 0.050 kgm2, second, 0.075 kgm2, and last, 0.100 kgm2. The secondary testing
session followed the same procedure as the first. No statistically significant (p < 0.05) effect was
found between any of the variables in the correlation analysis. There were large positive correlations
between the 1 repetition max flywheel Romanian deadlift and peak concentric power, relative strength,
and peak concentric and eccentric peak powers. Both body weight and relative strength showed
moderate negative correlations with % eccentric overload, whereas moderate positive correlations
were observed between 1RM and peak eccentric power. Both concentric power and eccentric power
showed excellent reliability, while the reliability for % eccentric overload ranged from poor to
excellent depending on the inertial load. In conclusion, this study shows that a protocol to assess the
maximum power output has excellent reliability for both ECC and CON power and may be used in
future flywheel training. The results also showed that body weight, maximum strength, and relative
strength were not largely related to power variables. An individualized approach to flywheel training
is required.
| Original language | English (Ireland) |
|---|---|
| Pages (from-to) | 291-298 |
| Number of pages | 7 |
| Journal | Biomechanics |
| DOIs | |
| Publication status | Published - 17 Jul 2023 |