Abstract
Objectives
To compare physiological and perceptual response of running on a curved non-motorized
treadmill (cNMT) with running on a motorized treadmill (MT), and to determine the
running velocity at which a physiological response ≥ 90% O2max was elicited.
Design & methods
13 trained male runners (mean ± SD; 36 ± 11 years, 1.80 ± 0.06 m, 70 ± 4 kg, O2max: 57.3 ± 3.5 mL kg−1 min−1) performed an incremental running test on a MT to determine O2max and the accompanying maximum velocity (Vmax). Participants first completed a familiarization
session on the cNMT. Next, participants ran for 4 min at five/six progressively higher velocities (40–90% Vmax). These runs were completed
on the cNMT and MT in two separate visits in a randomized and counterbalanced order.
Results
No participant was able to complete the 4 min run at 80% Vmax on the cNMT. Running on the cNMT elicit a higher relative oxygen
uptake (%O2max) across all velocities compared to the MT (32.5 ± 5%, p < 0.001, ES 3.3 ± 0.9), and was accompanied by significantly higher heart rates (16.8 ± 3%, p < 0.001, ES 3.4 ± 1.5), an altered cadence (2.6 ± 0.7%, p < 0.001, ES 0.8 ± 0.3) and ratings of perceived exertion (27.2 ± 5%, p < 0.001, ES 2.3 ± 0.6). A less efficient running economy was evident when running on the cNMT (+38.4 ± 16%, p < 0.001, ES 2.73). Individual (n = 9) linear interpolation predicted an exercise intensity of 90% O2max was achieved in the non-motorized condition when running at 62.1 ± 3.5% Vmax (R2 = 0.986 ± 0.01), which was lower than MT run in which 90% O2max was achieved at 81.4 ± 5.6% Vmax (R2 = 0.985 ± 0.02; 29.8 ± 8%, p < 0.001, ES 3.87).
Conclusions
Running on the cNMT has higher physiological and perceptual demands and increases
cadence.
Keywords
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Article info
Publication history
Published online: May 15, 2018
Accepted:
May 9,
2018
Received in revised form:
April 10,
2018
Received:
November 21,
2017
Identification
Copyright
© 2018 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.
