See the published version of this preprint at BMC Sports Science, Medicine and Rehabilitation.
This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
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Research article
Dawid Bączkowicz
Politechnika Opolska
Corresponding Author
ORCiD: https://orcid.org/0000-0002-3094-0824
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Background: The patellofemoral joint (PFJ) provides extremely low kinetic friction, which results in optimal arthrokinematic motion quality. Previous research showed that these friction-reducing properties may be diminished due to the increase in articular contact forces. However, this phenomenon has been not analyzed in vivo during functional daily-living activities. The aim of this study was the vibroarthrographic assessment of changes in PFJ arthrokinematics during squats with variated loads.
Methods: Fifty-seven asymptomatic subjects were enrolled in this study. Participants were asked to perform 3 trials: 4 repetitions of bodyweight squats (L0), 4 repetitions of 10 kg barbell back loaded squats (L10), 4 repetitions of 20 kg barbell back loaded squats (L20). During the unloaded and loaded (L10, L20) squats, vibroarthrographic signals were collected using an accelerometer placed on the patella and were described by the following parameters: variation of mean square (VMS), mean range (R4), and power spectral density for frequency of 50-250 Hz (P1) and 250-450 Hz (P2).
Results: Obtained results showed that the lowest values were noted in the unloaded condition and that the increased applied loads had a significant concomitant increase in all the aforementioned parameters bilaterally (p<0.05).
Conclusion: This phenomenon indicates that the application of increasing knee loads during squats corresponds to higher intensity of vibroacoustic emission, which may result in higher contact stress and kinetic friction as well as diminished arthrokinematic motion quality.
Keywords
Knee joint, Squat, Friction, Crepitus, Contact stress, Biomechanics
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CURRENT STATUS: Published
View the published article at BMC Sports Science, Medicine and Rehabilitation.
No community comments so far
Submission checks complete
On 21 Aug, 2020
Editorial decision: Accept
On 21 Aug, 2020
No comments provided
Editorial decision: Minor revision
On 17 Aug, 2020
Review #1 received
Received 03 Aug, 2020
Editor assigned
On 13 Jul, 2020
Reviewers invited
Invitations sent on 13 Jul, 2020
Reviewer #1 agreed
On 13 Jul, 2020
Submission checks complete
On 12 Jul, 2020
Editor invited
On 12 Jul, 2020
Version 1
Posted 11 May, 2020
No comments provided
Editorial decision: Minor revision
On 12 Jun, 2020
Review #2 received
Received 09 Jun, 2020
Review #1 received
Received 25 May, 2020
Reviewer #2 agreed
On 19 May, 2020
Reviewer #1 agreed
On 13 May, 2020
Reviewers invited
Invitations sent on 09 May, 2020
Submission checks complete
On 04 May, 2020
Editor assigned
On 03 May, 2020
Editor invited
On 02 May, 2020
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
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See the published version of this preprint at BMC Sports Science, Medicine and Rehabilitation.
This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research article
Dawid Bączkowicz
Politechnika Opolska
Corresponding Author
ORCiD: https://orcid.org/0000-0002-3094-0824
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Published
View the published article at BMC Sports Science, Medicine and Rehabilitation.
No community comments so far
Submission checks complete
On 21 Aug, 2020
Editorial decision: Accept
On 21 Aug, 2020
No comments provided
Editorial decision: Minor revision
On 17 Aug, 2020
Review #1 received
Received 03 Aug, 2020
Editor assigned
On 13 Jul, 2020
Reviewers invited
Invitations sent on 13 Jul, 2020
Reviewer #1 agreed
On 13 Jul, 2020
Submission checks complete
On 12 Jul, 2020
Editor invited
On 12 Jul, 2020
Version 1
Posted 11 May, 2020
No comments provided
Editorial decision: Minor revision
On 12 Jun, 2020
Review #2 received
Received 09 Jun, 2020
Review #1 received
Received 25 May, 2020
Reviewer #2 agreed
On 19 May, 2020
Reviewer #1 agreed
On 13 May, 2020
Reviewers invited
Invitations sent on 09 May, 2020
Submission checks complete
On 04 May, 2020
Editor assigned
On 03 May, 2020
Editor invited
On 02 May, 2020
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
View the published article at BMC Sports Science, Medicine and Rehabilitation.
Background: The patellofemoral joint (PFJ) provides extremely low kinetic friction, which results in optimal arthrokinematic motion quality. Previous research showed that these friction-reducing properties may be diminished due to the increase in articular contact forces. However, this phenomenon has been not analyzed in vivo during functional daily-living activities. The aim of this study was the vibroarthrographic assessment of changes in PFJ arthrokinematics during squats with variated loads.
Methods: Fifty-seven asymptomatic subjects were enrolled in this study. Participants were asked to perform 3 trials: 4 repetitions of bodyweight squats (L0), 4 repetitions of 10 kg barbell back loaded squats (L10), 4 repetitions of 20 kg barbell back loaded squats (L20). During the unloaded and loaded (L10, L20) squats, vibroarthrographic signals were collected using an accelerometer placed on the patella and were described by the following parameters: variation of mean square (VMS), mean range (R4), and power spectral density for frequency of 50-250 Hz (P1) and 250-450 Hz (P2).
Results: Obtained results showed that the lowest values were noted in the unloaded condition and that the increased applied loads had a significant concomitant increase in all the aforementioned parameters bilaterally (p<0.05).
Conclusion: This phenomenon indicates that the application of increasing knee loads during squats corresponds to higher intensity of vibroacoustic emission, which may result in higher contact stress and kinetic friction as well as diminished arthrokinematic motion quality.
Figure 1
Figure 2
Figure 3
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