Validity and Reliability of the Axiom Powertrain Cycle Ergometer When Compared with an SRM Powermeter

Bertucci, William; Duc, Sebastien; Villerius, Vincent; Grappe, Frédéric

doi:10.1055/s-2004-817855

Cited by 29 publications

(17 citation statements)

References 16 publications

(30 reference statements)

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“…The ergocycle is equipped with a motor unit that imposes a constant rolling resistance on the front wheel, but the Elite Axiom tends to overestimate the average power [25][26], so the value of power output was not used in this study.…”

Section: Methodsmentioning

confidence: 99%

Effects of backrest positioning and gear ratio on nondisabled subjects' handcycling sprinting performance and kinematics

Faupin

Gorce²,

Meyer³

et al. 2008

JRRD

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Abstract-Backrest position is a significant parameter in handcycling that one must consider when seeking to optimize the user-to-chair interface. We studied the effects of backrest position on handcycle propulsion kinematics. Ten nondisabled participants with no handcycle propulsion experience repeated an 8 s sprint with three backrest positions (backrest angle between 45°a nd 50° to the horizontal, backrest angle between 65° and 70° to the horizontal, and without backrest) and three gear ratios (GRs) (GR22/21 = low, GR32/21 = medium, and GR44/21 = high). We used three-dimensional movement analysis to calculate the average maximal velocity, cycle frequency, and angle parameters for the arms and trunk. Our results showed statistically higher trunk flexion/extension (p < 0.001) and maximal velocity (p < 0.001) when a backrest was not used. Moreover, these differences were accentuated as the GR increased (GR44/21). Our results suggest that handcycle users with unimpaired upper-body and trunk function can improve handcycling performance by removing the backrest. Nevertheless, future studies on specific groups of subjects with spinal cord injury should be conducted.

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Section: Methodsmentioning

confidence: 99%

Effects of backrest positioning and gear ratio on nondisabled subjects' handcycling sprinting performance and kinematics

Faupin

Gorce²,

Meyer³

et al. 2008

JRRD

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show abstract

“…The handcycle was connected to a computer-linked ergocycle (Elite, Axiom, Italy). The Elite Axiom ergocycle (Bertucci et al, 2005) was equipped with a motor unit that imposed a constant rolling resistance on the front wheel. The rolling resistance was also chosen by the researcher (1% in the current study).…”

Section: Instrumentationmentioning

confidence: 99%

A Biomechanical Analysis of Handcycling: A Case Study

Faupin¹,

Gorce²,

Watelain³

et al. 2010

Journal of Applied Biomechanics

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The aim of this study was to investigate muscle activity, kinematic, and handgrip-force pattern generation during handcycling. One able-bodied participant performed a 1-min exercise test on a handcycle at 70 revolutions per minute. This article proposes an original data collection and analysis methodology that gathers synchronized kinematics, kinetics, and electromyography. Such data, which most often appear complex, are easily summarized using this methodology. This preliminary study has an new setup and offers good indications on the biomechanical pattern for handcycling movement analysis.

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“…The Axiom PowerTrain ergometer was used for both the tests and has recently been described by Bertucci et al (2005). The bicycle tire pressure was inflated to 700 kPa.…”

Section: Methodsmentioning

confidence: 99%

“…This protocol has been described in detail by Bertucci et al (2005). The CAD was kept at 90 rpm throughout the test.…”

Section: First Test Sessionmentioning

confidence: 99%

Muscular activity level during pedalling is not affected by crank inertial load

et al. 2005

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The aim of the present study was to investigate the influence of gear ratio (GR) and thus crank inertial load (CIL), on the activity levels of lower limb muscles. Twelve competitive cyclists performed three randomised trials with their own bicycle equipped with a SRM crankset and mounted on an Axiom ergometer. The power output ( approximately 80% of maximal aerobic power) and the pedalling cadence were kept constant for each subject across all trials but three different GR (low, medium and high) were indirectly obtained for each trial by altering the electromagnetic brake of the ergometer. The low, medium and high GR (mean +/- SD) resulted in CIL of 44 +/- 3.7, 84 +/- 6.5 and 152 +/- 17.9 kg.m(2), respectively. Muscular activity levels of the gluteus maximus (GM), the vastus medialis (VM), the vastus lateralis (VL), the rectus femoris (RF), the medial hamstrings (MHAM), the gastrocnemius (GAS) and the soleus (SOL) muscles were quantified and analysed by mean root mean square (RMS(mean)). The muscular activity levels of the measured lower limb muscles were not significantly affected when the CIL was increased approximately four fold. This suggests that muscular activity levels measured on different cycling ergometers (with different GR and flywheel inertia) can be compared among each other, as they are not influenced by CIL.

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Validity and Reliability of the Axiom Powertrain Cycle Ergometer When Compared with an SRM Powermeter

Cited by 29 publications

References 16 publications

Effects of backrest positioning and gear ratio on nondisabled subjects' handcycling sprinting performance and kinematics

Effects of backrest positioning and gear ratio on nondisabled subjects' handcycling sprinting performance and kinematics

A Biomechanical Analysis of Handcycling: A Case Study

Muscular activity level during pedalling is not affected by crank inertial load

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