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Are mode-specific differences in performance fatigability attributable to muscle oxygenation?

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European Journal of Applied Physiology Aims and scope Submit manuscript

Abstract

Purpose

The purpose of this study was to examine the composite, intra-individual, and inter-individual patterns of responses for deoxygenated hemoglobin and myoglobin (deoxy[heme]), oxygenated hemoglobin and myoglobin (oxy[heme]), total hemoglobin and myoglobin (total[heme]), and tissue saturation index (StO2%) during fatiguing, maximal, isokinetic, unilateral, and bilateral leg extensions.

Methods

Nine men (Mean ± SD; age = 21.9 ± 2.4 years; height = 181.8 ± 11.9 cm; body mass = 85.8 ± 6.2 kg) performed 50 unilateral and bilateral maximal, concentric, isokinetic leg extensions at 180° s−1 on two separate visits. The muscle oxygenation parameters assessed with near-infrared spectroscopy from the dominant leg and isokinetic torque were averaged for 2 consecutive repetitions at 5 repetition intervals. Separate 2 (Condition [Unilateral and Bilateral]) × 10 (Repetition [5–50]) repeated measures ANOVAs were performed to examine mean differences for normalized isokinetic torque and each muscle oxygenation parameter. Intra- and inter-individual differences were examined with polynomial regression analyses.

Results

For normalized isokinetic torque, the unilateral condition (56.3 ± 10.5%) exhibited greater performance fatigability than the bilateral condition (45.0 ± 18.7%). Collapsed across Condition, deoxy[heme] exhibited an increase (p < 0.001), while StO2% exhibited a decrease (p < 0.001). The bilateral condition exhibited a more sustained decline in oxy[heme] than the unilateral condition (p = 0.005). Deoxy[heme], oxy[heme], and total[heme] exhibited substantial intra- and inter-individual differences for the fatigue-induced patterns of response.

Conclusion

The present findings indicated that the greater performance fatigability for unilateral versus bilateral fatiguing, maximal, isokinetic leg extensions was not attributable to differences in muscle oxygenation. Future studies of muscle oxygenation should report individual and composite fatigue-induced patterns of responses due to the substantial intra- and inter-individual variabilities.

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Abbreviations

ANOVA:

Analysis of variance

Deoxy[heme]:

Deoxygenated hemoglobin and myoglobin

NIRS:

Near-infrared spectroscopy

Oxy[heme]:

Oxygenated hemoglobin and myoglobin

StO2%:

Tissue saturation index

TOI:

Total oxygenation index

Total[heme]:

Total hemoglobin and myoglobin

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Funding

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Authors and Affiliations

Authors

Contributions

JPVA contributed to the data collection, analyses, manuscript writing, and accepts responsibility for the integrity of the data analysis. TJH, RJS and GOJ with JPVA conceived and designed the study. RJS and GOJ provided administrative oversight for the study. TJN and JLK assisted in data collection and interpretation. All authors contributed to the final drafting and approved the final submission of this manuscript.

Corresponding author

Correspondence to John Paul V. Anders.

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Conflict of interest

Authors report no conflicts of interest.

Ethical approval

This study was approved the University Institutional Review Board (IRB Approval #: 20191019755FB).

Consent to participate

Prior to participation, all subjects read and signed an informed consent document approved by the University Institutional Review Board.

Consent for publication

All authors consent to the publication of this work.

Additional information

Communicated by William J. Kraemer.

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Anders, J.P.V., Neltner, T.J., Keller, J.L. et al. Are mode-specific differences in performance fatigability attributable to muscle oxygenation?. Eur J Appl Physiol 121, 2243–2252 (2021). https://doi.org/10.1007/s00421-021-04694-5

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  • DOI: https://doi.org/10.1007/s00421-021-04694-5

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