Article

We aimed to observe differences in running style parameters and the
stride-to-stride coefficient of variation and correlative patterns using
detrended fluctuation analysis (DFA) between conventional and first-time
minimalistic shoe use. We also aimed to study the effect of fatigue on these
parameters. 26 recreational runners were tested using a pressure insole device on
a treadmill whilst wearing conventional (CONV) and minimalistic (MIN) shoes. They
then performed a prolonged running bout simulating a fatiguing training session,
before being tested a second time in both shoe types. Average values of strike
index (initial ground contact point on the footsole expressed as a percentage of
total sole length) were not significantly different between CONV [25.7+/-14.6%
(unfatigued), 23.1+/-11.1% (fatigued)] and
MIN [28.9+/-19.1% (unfatigued),
26.7+/-17.6% (fatigued)] (p=0.501). The fatigued state also yielded a similar
strike index compared to the unfatigued state (p=0.661). An overall trend in
decreased inter-stride correlative patterns of strike index was observed in MIN
compared to CONV (p=0.075). No differences in contact time, flight time, stride
time, duty factor, stride length and stride frequency were found between shoe
types. A trend in reduced flight time (p=0.078) and therefore increased duty
factor (p=0.053) was observed due to fatigue. We conclude that in recreational
runners, no meaningful, acute adaptation in running style occurs as a result of
first-time MIN use. Similarly, runners were able to maintain their running style
after a prolonged running bout.
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Langue : ANGLAIS