A Patellofemoral Chondropathy Quantification from Vibroarthrography: A Preliminary Study

2021 ◽  
Vol 104 (9) ◽  
pp. 1428-1432
Keyword(s):  
Spectral Density ◽  
Supine Position ◽  
Knee Flexion ◽  
Strongly Correlated ◽  
French Society ◽  
Meniscus Injury ◽  
Power Spectral ◽  
Kujala Score ◽  
Flexion Extension ◽  
Preliminary Study

Objective: To preliminarily investigate if the proposed parameter derived from the knee vibroarthrographic (VAG) signals, namely the VAG score, could potentially be used to quantify the patellofemoral chondropathy. Materials and Methods: Five subjects with meniscus injury as an indication for arthroscopy were recruited for the present preliminary crosssectional study. Prior to the arthroscopy, the Kujala scores were assessed and the knee VAG signals were recorded from all the subjects. Subjects were asked to actively perform the knee flexion-extension for three cycles in the supine position while recording the VAG signal. The proposed VAG score was defined as the power spectral density of the signal in the frequency of 450 to 1,000 Hz. Patellofemoral chondropathy was arthroscopically graded using French Society of Arthroscopy system (SFA) score and SFA category. Results: The SFA score was significantly strongly correlated with the VAG score (r=0.87, p=0.02) but not with the Kujala score (r=–0.79, p=0.11). Likewise, the SFA category was significantly correlated with the VAG score (r=0.98, p<0.01) but not with the Kujala score (r=–0.67, p=0.22). Conclusion: The proposed signal-based VAG score was demonstrated to be preliminarily able to better assess the patellofemoral chondropathy non-invasively, compared to the Kujala score, which is questionnaire-based. Keywords: Chondropathy; Vibroarthrographic signal; SFA score; SFA category; Kujala score

scholarly journals The Effect of Sleeping Position on Heart Rate Variability in Newborns

2020 ◽  
Author(s):  
Petja Fister ◽  
Manca Nolimal ◽  
Helena Lenasi ◽  
Matjaž Klemenc
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Spectral Density ◽  
Power Spectral Density ◽  
Gestational Age ◽  
Supine Position ◽  
Total Power ◽  
Sleeping Position ◽  
Power Spectral ◽  
Term Newborns

Abstract Background : Lower heart rate variability (HRV) in a newborn might represent a risk factor for unfavourable outcome, a longer recovery after illness, and a sudden infant death. Our aim was to determine whether the newborn’s sleeping position is associated with HRV. Methods : We performed a prospective clinical study in 46 hospitalized cardiorespiratory stable term newborns. During sleeping, we measured the parameters of HRV in four body positions (supine, supine with tilt, prone, prone with tilt). Results : The TP (total power spectral density) was significantly higher when lying supine in comparison to prone (p = 0,048) and to prone with tilt (p = 0,046). The HF (high frequency of power spectral density) in the supine position without tilt tended to be higher compared to prone without tilt (p > 0,05). The LF (low frequency power) was significantly higher when lying supine compared to prone, both without tilt (p = 0,018). TP and HF showed a positive correlation with gestational age (p = 0.044 and p = 0.036, respectively). Conclusions : In term newborns, sleeping position is associated with HRV. Higher TP and HF were found in the supine position, which might reflect better ANS stability. Gestational age positively correlated with TP and HF power, but only in supine position.

scholarly journals The Effect Of Sleeping Position On Heart Rate Variability In Newborns

2020 ◽  
Author(s):  
Petja Fister ◽  
Manca Nolimal ◽  
Helena Lenasi ◽  
Matjaž Klemenc
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Spectral Density ◽  
Power Spectral Density ◽  
Gestational Age ◽  
Supine Position ◽  
Total Power ◽  
Sleeping Position ◽  
Power Spectral ◽  
Term Newborns

Abstract Background : Lower heart rate variability (HRV) in a newborn might represent a risk factor for unfavourable outcome, a longer recovery after illness, and a sudden infant death. Our aim was to determine whether the newborn’s sleeping position is associated with HRV. Methods : We performed a prospective clinical study in 46 hospitalized cardiorespiratory stable term newborns. During sleeping, we measured the parameters of HRV in four body positions (supine, supine with tilt, prone, prone with tilt). Results : The TP (total power spectral density) was significantly higher when lying supine in comparison to prone (p = 0,048) and to prone with tilt (p = 0,046). The HF (high frequency of power spectral density) in the supine position without tilt tended to be higher compared to prone without tilt (p > 0,05). The LF (low frequency power) was significantly higher when lying supine compared to prone, both without tilt (p = 0,018). TP and HF showed a positive correlation with gestational age (p = 0.044 and p = 0.036, respectively). Conclusions : In term newborns, sleeping position is associated with HRV. Higher TP and HF were found in the supine position, which might reflect better ANS stability. Gestational age positively correlated with TP and HF power, but only in supine position.

scholarly journals The Effect Of Sleeping Position On Heart Rate Variability In Newborns

2019 ◽  
Author(s):  
Petja Fister ◽  
Manca Nolimal ◽  
Helena Lenasi ◽  
Matjaž Klemenc
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Spectral Density ◽  
Power Spectral Density ◽  
Supine Position ◽  
Total Power ◽  
Sudden Infant ◽  
Prospective Clinical Study ◽  
Sleeping Position ◽  
Power Spectral

Abstract Background : Lower heart rate variability (HRV) in a newborn might represent a risk factor for unfavourable outcome, a longer recovery after illness, and a sudden infant death. Our aim was to determine whether the newborn’s sleeping position is associated with HRV. Methods : We performed a prospective clinical study in 46 hospitalized cardiorespiratory term stable newborns. During sleeping, we measured the parameters of HRV in four body positions (supine, supine with tilt, prone, prone with tilt). Results : The TP (total power spectral density) was significantly higher when lying supine in comparison to prone (p = 0,048) and to prone with tilt (p = 0,046). The HF (high frequency of power spectral density) in the supine position without tilt tended to be higher compared to prone without tilt (p > 0,05). The LF (low frequency power) was significantly higher when lying supine compared to prone, both without tilt (p = 0,018). TP and HF showed a positive correlation with postmenstrual age (PMA) (p = 0.044 and p = 0.036, respectively). Conclusions : In term newborns, sleeping position is associated with HRV. Higher TP and HF were found in the supine position, which might reflect better ANS stability. PMA positively correlated with TP and HF power, but only in supine position.

scholarly journals The Effect of Sleeping Position on Heart Rate Variability in Newborns

2020 ◽  
Author(s):  
Petja Fister ◽  
Manca Nolimal ◽  
Helena Lenasi ◽  
Matjaž Klemenc
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Spectral Density ◽  
Power Spectral Density ◽  
Gestational Age ◽  
Supine Position ◽  
Total Power ◽  
Sleeping Position ◽  
Power Spectral ◽  
Term Newborns

Abstract Background : Lower heart rate variability (HRV) in a newborn might represent a risk factor for unfavourable outcome, a longer recovery after illness, and a sudden infant death. Our aim was to determine whether the newborn’s sleeping position is associated with HRV. Methods : We performed a prospective clinical study in 46 hospitalized cardiorespiratory stable term newborns. During sleeping, we measured the parameters of HRV in four body positions (supine, supine with tilt, prone, prone with tilt). Results : The TP (total power spectral density) was significantly higher when lying supine in comparison to prone (p = 0,048) and to prone with tilt (p = 0,046). The HF (high frequency of power spectral density) in the supine position without tilt tended to be higher compared to prone without tilt (p > 0,05). The LF (low frequency power) was significantly higher when lying supine compared to prone, both without tilt (p = 0,018). TP and HF showed a positive correlation with gestational age (p = 0.044 and p = 0.036, respectively). Conclusions : In term newborns, sleeping position is associated with HRV. Higher TP and HF were found in the supine position, which might reflect better ANS stability. Gestational age positively correlated with TP and HF power, but only in supine position.

scholarly journals The Effect of Sleeping Position on Heart Rate Variability in Newborns

2020 ◽  
Author(s):  
Petja Fister ◽  
Manca Nolimal ◽  
Helena Lenasi ◽  
Matjaž Klemenc
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Spectral Density ◽  
Power Spectral Density ◽  
Gestational Age ◽  
Supine Position ◽  
Total Power ◽  
Sleeping Position ◽  
Power Spectral ◽  
Term Newborns

Abstract Background : Lower heart rate variability (HRV) in a newborn might represent a risk factor for unfavourable outcome, a longer recovery after illness, and a sudden infant death. Our aim was to determine whether the newborn’s sleeping position is associated with HRV. Methods : We performed a prospective clinical study in 46 hospitalized cardiorespiratory stable term newborns. During sleeping, we measured the parameters of HRV in four body positions (supine, supine with tilt, prone, prone with tilt). Results : The TP (total power spectral density) was significantly higher when lying supine in comparison to prone (p = 0,048) and to prone with tilt (p = 0,046). The HF (high frequency of power spectral density) in the supine position without tilt tended to be higher compared to prone without tilt (p > 0,05). The LF (low frequency power) was significantly higher when lying supine compared to prone, both without tilt (p = 0,018). TP and HF showed a positive correlation with gestational age (p = 0.044 and p = 0.036, respectively). Conclusions : In term newborns, sleeping position is associated with HRV. Higher TP and HF were found in the supine position, which might reflect better ANS stability. Gestational age positively correlated with TP and HF power, but only in supine position.

scholarly journals Experimental Approach of Quadriceps Strength Measurement: Implications for Assessments in Critically Ill Survivors

Diagnostics ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 202
Author(s):  
Anne-Françoise Rousseau ◽  
Isabelle Kellens ◽  
Pierre Delanaye ◽  
Olivier Bruyère ◽  
Benoit Misset ◽  
...  
Keyword(s):  
Healthy Volunteers ◽  
Critically Ill ◽  
Supine Position ◽  
Knee Flexion ◽  
Experimental Approach ◽  
Quadriceps Strength ◽  
Strongly Correlated ◽  
Strength Measurement ◽  
Practical Implications

(1) Background: The supine testing position is suitable for early quadriceps strength (QS) assessment in intensive care unit, while a seated position is more appropriate for survivors who have regained mobility. Acquiring consistent measurements is essential for longitudinal follow-up. We compared the QS generated in different settings in healthy volunteers. (2) Methods: Isometric QS was assessed using a MicroFet2 and standardised protocols comparing different modalities. Hip and knee flexion angles were, respectively, 45° and 40° (H45-K40) in the supine position, and both at 90° (H90-K90) in the seated position. Dynamometer was either handheld (non-fixed configuration, NFC), or fixed (FC) in a cubicle. (3) Results: QS in H90–K90 and H45-K40 positions were strongly correlated, but QS was higher in the later position regardless of the configuration. Compared to H45-K40, biases of 108.2N (or 28.05%) and 110.3N (27.13%) were observed in H90-K90 position, respectively, in the NFC and FC. These biases were independently and positively associated with QS (p < 0.001). For both position, there were no significant differences between QS measured in NFC or FC. (4) Conclusions: The quadriceps was less efficient in the seated position, compared to the supine position, in healthy volunteers. These findings have practical implications for further assessments and research in critically ill patients.

scholarly journals The Effect Of Sleeping Position On Heart Rate Variability In Newborns

2020 ◽  
Author(s):  
Petja Fister ◽  
Manca Nolimal ◽  
Helena Lenasi ◽  
Matjaž Klemenc
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Spectral Density ◽  
Power Spectral Density ◽  
Gestational Age ◽  
Supine Position ◽  
Total Power ◽  
Sleeping Position ◽  
Power Spectral ◽  
Term Newborns

Abstract Background : Lower heart rate variability (HRV) in a newborn might represent a risk factor for unfavourable outcome, a longer recovery after illness, and a sudden infant death. Our aim was to determine whether the newborn’s sleeping position is associated with HRV. Methods : We performed a prospective clinical study in 46 hospitalized cardiorespiratory stable term newborns. During sleeping, we measured the parameters of HRV in four body positions (supine, supine with tilt, prone, prone with tilt). Results : The TP (total power spectral density) was significantly higher when lying supine in comparison to prone (p = 0,048) and to prone with tilt (p = 0,046). The HF (high frequency of power spectral density) in the supine position without tilt tended to be higher compared to prone without tilt (p > 0,05). The LF (low frequency power) was significantly higher when lying supine compared to prone, both without tilt (p = 0,018). TP and HF showed a positive correlation with gestational age (p = 0.044 and p = 0.036, respectively). Conclusions : In term newborns, sleeping position is associated with HRV. Higher TP and HF were found in the supine position, which might reflect better ANS stability. Gestational age positively correlated with TP and HF power, but only in supine position.

scholarly journals The Effect Of Sleeping Position On Heart Rate Variability In Newborns

2020 ◽  
Author(s):  
Petja Fister ◽  
Manca Nolimal ◽  
Helena Lenasi ◽  
Matjaž Klemenc
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Spectral Density ◽  
Power Spectral Density ◽  
Gestational Age ◽  
Supine Position ◽  
Total Power ◽  
Sleeping Position ◽  
Power Spectral ◽  
Term Newborns

Abstract Background : Lower heart rate variability (HRV) in a newborn might represent a risk factor for unfavourable outcome, a longer recovery after illness, and a sudden infant death. Our aim was to determine whether the newborn’s sleeping position is associated with HRV. Methods : We performed a prospective clinical study in 46 hospitalized cardiorespiratory stable term newborns. During sleeping, we measured the parameters of HRV in four body positions (supine, supine with tilt, prone, prone with tilt). Results : The TP (total power spectral density) was significantly higher when lying supine in comparison to prone (p = 0,048) and to prone with tilt (p = 0,046). The HF (high frequency of power spectral density) in the supine position without tilt tended to be higher compared to prone without tilt (p > 0,05). The LF (low frequency power) was significantly higher when lying supine compared to prone, both without tilt (p = 0,018). TP and HF showed a positive correlation with gestational age (p = 0.044 and p = 0.036, respectively). Conclusions : In term newborns, sleeping position is associated with HRV. Higher TP and HF were found in the supine position, which might reflect better ANS stability. Gestational age positively correlated with TP and HF power, but only in supine position.

Cardiovascular and Metabolic Responses to Electrical Stimulation-Induced Leg Exercise in Spinal Cord Injury

1997 ◽  
Vol 36 (04/05) ◽  
pp. 372-375 ◽  
Author(s):  
J. R. Sutton ◽  
A. J. Thomas ◽  
G. M. Davis
Keyword(s):  
Spinal Cord ◽  
Heart Rate ◽  
Spinal Cord Injury ◽  
Cardiac Output ◽  
Electrical Stimulation ◽  
Knee Flexion ◽  
Flexion Extension ◽  
Cord Injury ◽  
Leg Exercise ◽  
Leg Muscle

Abstract:Electrical stimulation-induced leg muscle contractions provide a useful model for examining the role of leg muscle neural afferents during low-intensity exercise in persons with spinal cord-injury and their able-bodied cohorts. Eight persons with paraplegia (SCI) and 8 non-disabled subjects (CONTROL) performed passive knee flexion/extension (PAS), electrical stimulation-induced knee flexion/extension (ES) and voluntary knee flexion/extension (VOL) on an isokinetic dynamometer. In CONTROLS, exercise heart rate was significantly increased during ES (94 ± 6 bpm) and VOL (85 ± 4 bpm) over PAS (69 ± 4 bpm), but no changes were observed in SCI individuals. Stroke volume was significantly augmented in SCI during ES (59 ± 5 ml) compared to PAS (46 ± 4 ml). The results of this study suggest that, in able-bodied humans, Group III and IV leg muscle afferents contribute to increased cardiac output during exercise primarily via augmented heart rate. In contrast, SCI achieve raised cardiac output during ES leg exercise via increased venous return in the absence of any change in heart rate.

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