scholarly journals Plantar support adaptations in healthy subjects after eight weeks of barefoot running training

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e8862
Author(s):  
Celso Sánchez-Ramírez ◽  
Luis M. Alegre
Keyword(s):  
Peak Pressure ◽  
Time Factor ◽  
Flat Foot ◽  
Barefoot Running ◽  
Running Training ◽  
Significant Difference ◽  
Increasing Trend ◽  
Pressure Peak ◽  
Reaction Forces ◽  
The Moment

Background Although the studies of barefoot running have intensified, it is still missing longitudinal work analyzing the effects of barefoot running on the phases of plantar support. The objective of this research was to analyze the modifications undergone by the Total Foot Contact (TFC) phase and its Flat Foot Phase (FFP) in subjects beginning the practice of barefoot running, in its acute and chronic effects. Methods A total of 28 subjects were divided into the Barefoot Group (BFGr) (n = 16) and the Shod Group (SHGr) (n = 12), evaluated before (Baseline) and after running for 20 min at 3.05 m·s−1 (Post 20 min Running), and at the end of a running training protocol with an 8-week long progressive volume (Post-8-week Training). The dynamic plantar support was measured with a baropodoscope. The duration of TFC (ms), the moment at which the FFP occurred, the maximum surface of TFC (MSTFC) (cm2), the FFP surface (SFFP) (cm2), the peak pressure of TFC (PP°TFC) (kg·cm−2), and the peak pressure of FFP (PP°FFP) (kg·cm−2) were recorded. The 3 × 2 ANOVA analysis was made to determine the effects and interactions that the condition produced (Shod/Barefoot), and the time factor (Baseline/Post 20 min Running/Post-8-week Training). Results The condition factor caused more significant effects than the time factor in all the variables. Duration of TFC in BFGr showed significant differences between the Baseline and Post-8-week Training (p = 0.000) and between Post-20-min Running and Post-8-week Training (p = 0.000), with an increasing trend. In the moment at which the FFP occurred a significant increase (p = 0.029) increase was found in Post-20 min Running (48.5%) compared to the Baseline (42.9%). In MSTFC, BFGr showed in Post-8-week Training values significantly higher than the Baseline (p = 0.000) and than Post-20-min Running (p = 0.000). SHGr presented a significant difference between the Baseline and Post-8-week Training (p = 0.040). SFFP in BFGr modified its values with an increasing trend (p = 0.000). PP°TFC in BFGr showed a significant decrease (p = 0.003) in Post-8-week Training (1.9 kg·cm−2) compared to the Baseline (2.4 kg·cm−2). In PP°FFP significant decreases were recorded in BFGr and between Post-8-week Training and Baseline (p = 0.000), and Post-8-week Training and Post 20 min Running (p = 0.035). Conclusions The adaptation took place after the 8-week training. The adaptations to running barefoot were characterized by causing an increase of the foot’s plantar support in TFC and in FFP, as well as a decrease of the plantar pressure peak in both phases. Also, there is an increased duration of the TFC and FFP, which may be related to an acquired strategy to attenuate the impacts of the ground’s reaction forces.

The Influence of the Improvement of Calf Strength on Barefoot Loading

2019 ◽  
Vol 40 ◽  
pp. 16-25
Author(s):  
Xuan Zhen Cen ◽  
Zhi Qiang Liang ◽  
Zi Xiang Gao ◽  
Wen Lan Lian ◽  
Zhang Ming Wang
Keyword(s):  
Strength Training ◽  
Plantar Pressure ◽  
Muscular Strength ◽  
Peak Pressure ◽  
Center Of Pressure ◽  
Healthy Male ◽  
Barefoot Running ◽  
Pressure Plate ◽  
Increasing Trend ◽  
Male Subjects

The purpose of this study was to determine whether enhancement of calf muscular strength can produce influence on plantar pressure in barefoot running. Ten healthy male subjects (age:22±2.5 years, height: 1.76±0.4m, body mass: 65±2.5kg) participate this experiment enduring 8-week strength training adopting by calf raise movement on calf muscle. A medical ultrasonic instrument (Q6, China) was used to observe the variation of calf muscular morphology. A plantar pressure plate ( Novel Emed, Germany) was used to collect the variation of 8-region plantar pressure. After 8-week strength training, a significant increasing trend between pre-and post-strength training in subject`s pinnation angle (PA) of the gastrocnemius was found. Under strength training, there are some significant variations between pre-and post-plantar pressure. The start point of center of pressure (COP) gradually forward (middle foot 80%, forefoot 20%); the peak pressure of subject`s heel foot (HF) significantly lower; the maximal force in second-third metatarsal (M 2-3), medial foot (MF) and HF significantly decrease; the contact area in other toe (OT) significantly increase as well as MF and HF significantly decrease; the time-force integral in M2-3 and HF significantly lower and in MF significantly enhance. These results suggest, the enhancement of calf muscular strength may produce positively influence on beginning transitional process from shod running to barefoot running and is also worth to as a feasible way to recommend. However, the effects of strength straining on plantar pressure do not fully explore and still need to deeply explore own to existing limitations.

Tympanometric Measures of Eustachian Tube Function

1987 ◽  
Vol 30 (2) ◽  
pp. 207-214 ◽  
Author(s):  
Catherine L. Riedel ◽  
Terry L. Wiley ◽  
Michael G. Block
Keyword(s):  
Young Adults ◽  
Eustachian Tube ◽  
Middle Ear ◽  
Peak Pressure ◽  
Eustachian Tube Function ◽  
Significant Difference ◽  
Acoustic Admittance ◽  
Tube Function ◽  
Pressure Peak ◽  
Negative Gradient

The purpose of this study was to develop instructions and procedures and to establish a normal data base for four tympanometric tests of Eustachian tube function: Valsalva, Toynbee, Inflation, and Deflation. Data were obtained for 24 young adults (48 ears) with normal hearing and normal middle-ear function. The tympanograms were analyzed for differences between baseline and experimental (postmaneuver) and baseline and posttest tracings for seven measures: tympanogram peak pressure, peak acoustic admittance, static acoustic admittance, negative gradient, positive gradient, and negative and positive acoustic-admittance values at ±400 daPa. The results indicated a statistically significant difference only in peak pressure for baseline and experimental tympanograms. Peak-pressure shifts were most pronounced for the Valsalva and Toynbee procedures. The small pressure shifts characteristic of the Inflation and Deflation procedures coupled with the potential for instrumental error severely limit the use of these procedures as means of obtaining reliable indices of tubal function.

INFLUENCE OF FOOT INSOLE ON THE GAIT PERFORMANCE IN SUBJECTS WITH FLAT FOOT DISORDER

2019 ◽  
Vol 19 (06) ◽  
pp. 1950050
Author(s):  
M. T. KARIMI ◽  
R. B. TAHMASEBI ◽  
B. SATVATI ◽  
F. FATOYE
Keyword(s):  
Range Of Motion ◽  
Ankle Joint ◽  
Lower Limb ◽  
Walking Speed ◽  
Force Plate ◽  
Flat Foot ◽  
Gait Performance ◽  
Positive Effects ◽  
Significant Difference ◽  
Foot Disorder

Flat foot is the most common foot disorder that influences the alignment of the lower limb structure. It is controversial whether the use of foot insole influences kinetic and kinematic of the leg or not. Therefore, this study investigated the influence of foot insole on the gait performance in subjects with flat foot disorder. A group of flat foot subject was recruited into this study (the number of subjects was 15). The motion of the leg joints was determined using the Qualysis motion analysis system. Moreover, the force applied on the lower limb was recorded by a Kistler force plate. The range of motion of the lower limb joints, the moments applied on the lower limb joints and force transmitted through the leg were the parameters used in this study. The difference between these parameters during walking with and without insole was evaluated using the paired [Formula: see text]-test. Significant value was set at [Formula: see text]. There was no significant difference between the range of motion of ankle joint while walking with and without insole. However, the medial directed force applied on the leg decreased significantly [Formula: see text]. The use of foot insole did not influence the moments transmitted through the hip and knee joints. The walking speed of the subjects improved while walking with foot insole. Use of foot insole influenced the magnitude of the force applied on the leg and the adductor moment of ankle joint due to its influence on foot alignment. As the walking speed of the improved subjects follows the use of insole, it can be concluded that it may have a positive effects on the performance of flat foot subjects.

scholarly journals Outcome of the use of 0.9% saline versus 0.45% saline for fluid rehydration in moderate and severe diabetic ketoacidosis in children

2021 ◽  
Vol 69 (1) ◽  
Author(s):  
Nora El Said Badawi ◽  
Mona Hafez ◽  
Heba Sharaf Eldin ◽  
Hend Mehawed Abdelatif ◽  
Shimaa Atef ◽  
...  
Keyword(s):  
Blood Glucose ◽  
Diabetic Ketoacidosis ◽  
Normal Saline ◽  
Sodium Concentration ◽  
Saline Group ◽  
Serum Electrolytes ◽  
Serum Chloride ◽  
Significant Difference ◽  
Rehydration Solution ◽  
The Moment

Abstract Background The debate for the optimum sodium concentration in the rehydration solution in diabetic ketoacidosis (DKA) persists till the moment. The aim was to compare the outcome of 0.9% saline versus 0.45% saline in children with moderate and severe (DKA) regarding the effect on serum electrolytes, duration of DKA resolution and the incidence of hyperchloremia. Results A retrospective analysis of 121 children with moderate or severe DKA was done. After the initial 4 h in which both groups received normal saline, patients were divided into two groups continuing on 0.9% (N=72) or switched to 0.45% saline (N=49). Serum chloride and Cl/Na ratios were significantly higher in 0.9% saline group at 4 and 8 h. The 0.9% saline group had significantly higher proportion of hyperchloremia at 4 and 8 h (P value: 0.002, 0.02). The median duration of correction of DKA (14 h among 0.9% saline versus 10 h among 0.45% saline) without significant difference (P value= 0.43). The change in plasma glucose, effective osmolarity, corrected Na levels were comparable between groups. Conclusion There is an unavoidable iatrogenically induced rise in serum chloride with higher incidence of hyperchloremia with the use of normal saline in rehydration of children presenting in DKA and shock. The use of 0.45% saline as post-bolus rehydration fluid is not associated with a decline in the corrected serum sodium concentration and does not affect the rate of correction of acidosis or rate of drop in blood glucose or duration of DKA resolution when compared to normal saline.

Assessment of the reliability of ionization current measurement in estimating peak pressure angle in a spark ignition engine

2021 ◽  
pp. 146808742110399
Author(s):  
Veniero Giglio ◽  
Livia Della Ragione ◽  
Alessandro di Gaeta ◽  
Natale Rispoli
Keyword(s):  
Peak Pressure ◽  
Angular Position ◽  
Spark Ignition ◽  
Operating Conditions ◽  
Spark Ignition Engine ◽  
Mean Values ◽  
Pressure Angle ◽  
Ionization Current ◽  
Significant Difference ◽  
Second Peak

Ionization current measured at the spark plug during combustion in spark ignition engines has often been proposed to determine the crank-angle at combustion pressure peak, namely the peak pressure angle, for the purpose of regulating spark timing to attain maximum brake torque (MBT). The proposal is based on the assumption that agreement exists between peak pressure angle and the angular position of the ionization current second peak, although no one has ever proved it by an appropriate statistical analysis. The aim of this work, for the first time and by rigorous statistical methods, is to prove the agreement between Peak Pressure Angle and Ionization Current Second Peak Angle (ICSPA), without which a MBT control via ICSPA would be ineffective. Our experimental database consisted of about 9000 pairs of Peak Pressure Angle and Ionization Current Second Peak Angle values corresponding to 90 different operating conditions of a spark ignition engine. A two-sample comparison was first carried out between mean values of Peak Pressure Angle and Ionization Current Second Peak Angle, which showed a statistically significant difference between them. Then Bland-Altman analysis (Lancet, 1986), widely known and used for checking agreement between two different measurement methods, was conducted. It demonstrated that under almost all the experimental operating conditions, there was no agreement between the Ionization Current Second Peak Angle and the Peak Pressure Angle.

scholarly journals Thromboelastometric evaluation of horses submitted to experimental thrombosis and jugular thrombectomy

2016 ◽  
Vol 36 (8) ◽  
pp. 677-686 ◽  
Author(s):  
Dietrich Pizzigatti ◽  
Daniele S. Gonçalves ◽  
Thays C. Trentin ◽  
Regina K. Takahira ◽  
Ana L.G. Alves ◽  
...  
Keyword(s):  
Platelet Count ◽  
Surgical Treatment ◽  
Alpha Angle ◽  
Fogarty Catheter ◽  
Significance Level ◽  
Treatment Groups ◽  
Significant Difference ◽  
Group 2 ◽  
The Moment ◽  
Α Angle

Abstract: Jugular thrombosis in horses occurs commonly in iatrogenic situations, secondary to endotoxemic clinical condition and disseminated vascular coagulation, potentially leading to death. Thus, hemostatic evaluation becomes necessary and extremely important for monitoring the risks of systemic hypercoagulability and for the efficiency of allopathic and surgical treatment. This paper describes the hemostatic behavior in experimental jugular thrombosis of ten healthy equines, subsequently submitted to two thrombectomy techniques and receiving heparin sodium as anti-rethrombosis therapy. These animals were evaluated for 20 days by thromboelastometry (TEM), platelet count, hematocrit and fibrinogen, at four moments: pre-induction to phlebitis (D0-MPF); three days after thrombophlebitis induction (D3-MFM); 6 days after, - moment of thrombophlebitis - (D9-MT); and 54 (D16) and 126 (D19) hours after thrombectomies (PTM). Thrombectomy was performed via a Vollmar Ring (group 1, n=5) and Fogarty catheter (group 2, n=5). All the animals received heparin (150 UI/kg, SC) every 12 hours, for ten days after the respective thrombectomies. Through the blood samples were evaluated TEM, activated partial thromboplastin time (aPTT) and prothrombin time (PT), dosing of fibrinogen, hematocrit and platelet count at the abovementioned moments. For comparison between groups and moments the t test was applied at 5% significance level. No significant difference was verified between treatment groups at any of the moments. There were reductions in clotting time (CT) and clot formation time (CFT), with increase in maximum lysis (ML) until the moment D9-MT. Evaluation through INTEM® reagent presented prolongations of CT and CFT with reduction of α angle and ML starting from D16 and D19. Similarly, aPTT presented significant differences between moments pre- (D0, 3 and 9) and post- (D16 and 19) anticoagulant and surgical treatment. The platelet numbers were diminished at moments D16 and D19. In evaluation with EXTEM® reagent, prolongation of CT and CFT occurred only between the moments D0 vs. D3 and vs. D9. O PT did not present significant differences. The results obtained demonstrate that experimental jugular thrombophlebitis leads to local clinical alterations, with impairment of tissue and of the extrinsic coagulation pathway (EXTEM® ), but without evidence of systemic hypercoagulability status, since there was no increase of the alpha angle or maximum clot firmness (MCF). Furthermore, TEM was shown useful and more sensitive than conventional coagulation tests (PT, aPTT and fibrinogen) for the monitoring of anticoagulant therapy, as demonstrated in other works.

scholarly journals EFFECTIVENESS OF GLUTEAL MUSCLE STRENGTHENING ON FLAT FOOT

2017 ◽  
Vol 10 (6) ◽  
pp. 219
Author(s):  
Pooja A Mulchandani ◽  
Trupti Warude ◽  
Amrutkuvar Pawar
Keyword(s):  
T Test ◽  
P Value ◽  
Random Allocation ◽  
Gluteal Muscle ◽  
Flat Foot ◽  
Muscle Strengthening ◽  
Intrinsic Muscle ◽  
Navicular Drop ◽  
Significant Difference ◽  
Paired T Test

Objectives: To compare the effect of gluteal muscle strengthening along with conventional exercises versus conventional exercises alone on flat foot.Method: An experimental study conducted at Physiotherapy Department of Krishna Institute of Medical Sciences, Karad. A total of 52 subjects were equally divided into two groups using convenient sampling with random allocation (Groups A and B). Baseline treatment was given to both groups (intrinsic muscle strengthening). Group A was given intrinsic muscle strengthening alone while Group B was given gluteal muscle strengthening along with intrinsic muscle strengthening.Result: Statistical analysis was performed using paired t-test and unpaired t-test. In pre-intervention there was no statistically significant difference seen with p values for the navicular drop was 0.3563 and for Ink test was 0.7342. While on comparing the post-interventional values, the results between the two groups using paired t-test revealed that there was extremely significant difference seen with p-value for the navicular drop was <0.0001 and for Ink test was <0.0001.Conclusion: From the study, it can be concluded that there was a significant effect of gluteal muscle strengthening on the flat foot.

Comparative Calculations of TROI TS-2 and TS-3 Steam Explosion Experiments With TEXAS-V

2017 ◽  
Author(s):  
Taehoon Kim ◽  
Sukyoung Pak ◽  
Yongjin Cho
Keyword(s):  
Void Fraction ◽  
Steam Explosion ◽  
Peak Pressure ◽  
Severe Accident ◽  
Experiment Data ◽  
Trigger Time ◽  
Vessel Reactor ◽  
The Moment ◽  
Containment Integrity ◽  
Good Agreement

During a severe accident, contact of the molten corium with the coolant water may cause an energetic steam explosion which is a rapid increase of explosive vaporization by transfer to the water of a significant part of the energy in the corium melt. This steam explosion has been considered as an adverse effect when the water is used to cool the molten corium and could threaten reactor vessel, reactor cavity, containment integrity. In this study, TROI TS-2 and TS-3 experiments as part of the OECD/SERENA-2 project were analyzed with TEXAS-V. Input parameters were based on actual TROI experiment data. In mixing simulations, calculated results were compared to melt front behavior, void fraction in trigger time and other parameters in experiment results. In explosion simulations, corresponding to TROI experiments an external triggering was employed at the moment that melt front reached heights of 0.4 m. Calculated results of peak pressure and impulse at the bottom were compared with TROI experiment results. Melt front behaviors of the melt was different from the experimental results in both TS-2 and TS-3. Void fraction in triggering time in TS-2 was in good agreement with the experiment results and in TS-3 was slightly overestimated. The peak pressure and impulse at bottom were successfully predicted by TEXAS-V. These calculations will allow establishing whether the limitations and differences observed in the simulations of the experiments are important for the reactor case.

scholarly journals Effect of diets with different levels of guanidinoacetic acid on newly weaned piglets

2017 ◽  
Vol 38 (6) ◽  
pp. 3887 ◽  
Author(s):  
Karla Andrade Teixeira ◽  
Alessandra Gimenez Mascarenhas ◽  
Heloisa Helena de Carvalho Mello ◽  
Emmanuel Arnhold ◽  
Patrícia Da Silva Assunção ◽  
...  
Keyword(s):  
Creatine Kinase ◽  
Block Design ◽  
Initial Period ◽  
Daily Weight Gain ◽  
Experimental Unit ◽  
Feed Conversion ◽  
Guanidinoacetic Acid ◽  
Significant Difference ◽  
Increasing Trend ◽  
Blood Creatinine

Ninety barrow piglets weaned at 21 days old were used to evaluate the effects of guanidinoacetic acid (GAA) supplementation on their performance and blood creatinine and creatine kinase (CK) levels during the nursery phase (21 to 63 days old). The piglets were distributed in a randomized block design with five treatments (0, 0.05, 0.10, 0.15, and 0.20% GAA inclusion), six repetitions, and three animals per repetition. The experimental rations were formulated to meet the nutritional requirements for the phases of 21 to 32, 33 to 42 and 43 to 63 days of age. The experimental diets and water were offered ad libitum throughout the experimental period. At 42 and 63 days old, blood was collected from one animal in each experimental unit for creatinine and creatine kinase analysis. The analysed variables were daily weight gain (DFG), daily feed intake (DFI), and feed conversion (FC) in the 21 to 42 days old and 21 to 63 days old of the nursery phase. All variables were subjected to analysis of variance and regression analysis. We adopted ? = 0.05, and considered a trend to be present when ? was between 0.05 and 0.10. In the pre-initial period (21 to 42 days old), there was an increasing trend in daily weight (P = 0.069), which increased to the level of 0.97% of GAA inclusion. The DFI and FC were not significantly affected by the addition of different GAA levels in the diet. Creatinine levels in the blood at 42 and 63 days old were not significantly influenced by the treatments. The level of CK at 42 days old showed an increasing trend (P = 0.077) that occurred quadratically to the level of 0.085% of GAA inclusion, with no significant difference for this variable at 63 days old. The use of GAA did not promote improvements in performance or blood creatinine and CK levels in piglets in the nursery phase.

scholarly journals RETROSPECTIVE ANALYSIS OF EVENTS OF DEATH AT HOME AMONG PATIENTS UNDER FOLLOW-UP OBSERVATION

2018 ◽  
Vol 35 (1) ◽  
pp. 68-74
Author(s):  
Ya P Sandakov
Keyword(s):  
Cardiovascular Diseases ◽  
Medical Records ◽  
Emergency Calls ◽  
Significant Difference ◽  
Duration Of Disease ◽  
The Moment ◽  
Age Of Death ◽  
At Home

Aim. To study the peculiarities of asking for medical care by patients from among those dead at home, who had been under follow-up observation. Materials and methods. The data, received from ambulatory medical records of 100 dead at home patients with follow-up, were analyzed using the methods of descriptive and inductive statistics. Results. A mean age of death was 74.9 ± 13.4 years, men - 65.8 ± 14.1 years, women - 79.2 ± 10.9 years. Cardiovascular diseases were the cause of follow-up observation in 78 % of cases and the cause of death in 85 %; in 30 % of patients the disease was detected while carrying out prophylactic medical examination. A mean duration of disease by the moment of death was 13.0 ± 8.0 years, among pensioners 13.7 ± 8.5 years, in able-bodied persons 9.6 ± 4.3 years. A mean duration of follow-up observation was 9.2 ± 5.8 years. An average number of planned visits was 2.8 ± 0.89, but the number of real visits during the last year of follow-up observation was 2.4 ± 1.2. Disability was registered in 77.6 % of patients, concomitant diseases - in all patients. For the last year, exacerbations were recorded in 92 % of patients, emergency calls - in 80 %, hospitalization events - 52 %, including 55.8 % - urgent ones. Conclusions. The absence of significant difference regarding the duration of disease between pensioners and able-bodied patients (т = 0.16, р = 1.43) as well as the absence of correlation between the age and duration of disease (χ2 = 0.19, p = 0.2) indirectly prove the influence of duration of disease on its outcome, but not the age. Attendance, characterizing clinical loyalty to treatment, does not depend on age (χ2 = -0.19, р = 0.18), sex (т = 1.0, р = 0.32), way of detecting disease (f = 0.9, p = 0.4), class of main disease (f = 0.91, p = 0.44), duration of disease (χ2 = -0.13, р = 0.49), exacerbations (χ2 = -0.17, р = 0.24), concomitant diseases (χ2 = 0.006, р = 0.9). The number of emergency calls, hospitalizations, urgent hospitalizations does not depend on duration of follow-up observation, regularity and number of real visits to a doctor (p > 0.05) that indicates unsatisfactory quality of follow-up observation.

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