The Effect of Rearfoot Motion on Attenuation of the Impulse Wave at Impact during Running

1996 ◽  
Vol 12 (3) ◽  
pp. 313-325 ◽  
Author(s):  
Vanessa R. Yingling ◽  
H. John Yack ◽  
Scott C. White
Keyword(s):  
Stance Phase ◽  
Impact Force ◽  
The Body ◽  
Impulse Wave ◽  
Time To Peak ◽  
Frequency Peak ◽  
Heel Contact ◽  
Significant Difference ◽  
Rearfoot Motion ◽  
The Impact

This study investigated whether rearfoot motion at heel contact during running attenuates the magnitude of the impact force traveling through the body. Fifteen subjects completed running trials for two conditions:(a) running on a treadmill at a self-selected speed and a cadence of 160 steps/min and (b) running at the same speed and cadence but with rearfoot motion limited by a medial wedge inserted into the subject's shoe. A pairedttest was used to test for differences between conditions in the peak accelerations of each accelerometer and the time to peak of the tibia acceleration. The predominant impact frequency and amplitude of the frequency peak were also tested for significant differences. No significant difference was found in the variables compared between the two conditions. The results demonstrated that restriction of rearfoot motion using a medial wedge during the initial 15% of the stance phase has no effect on the characteristics of the impulse wave at the tibia.

scholarly journals Effect of intermittent versus continuous calorie restriction on body weight and cardiometabolic risk markers in subjects with overweight or obesity and mild-to-moderate hypertriglyceridemia: a randomized trial

2020 ◽  
Vol 19 (1) ◽  
Author(s):  
Mahsa Maroofi ◽  
Javad Nasrollahzadeh
Keyword(s):  
Body Weight ◽  
Calorie Restriction ◽  
Density Lipoprotein ◽  
The Body ◽  
Trial Registration ◽  
Lipoprotein Cholesterol ◽  
Short Term ◽  
Significant Difference ◽  
The Impact ◽  
Overweight Or Obesity

Abstract Background Intermittent calorie restriction (ICR) is a novel method of dietary restriction for body weight control with the potential to improve obesity-related cardiometabolic markers, but the impact of this diet on subjects with hypertriglyceridemia (HTG) remains unknown. Methods Eighty-eight subjects with overweight or obesity and mild-to-moderate HTG were randomized to the continuous calorie restriction (CCR) group, or ICR group (a very low-calorie diet during 3 days of the week) for 8 weeks (44 patients in each group). Body composition, plasma lipids, glucose, insulin, adiponectin, and liver enzymes were measured at baseline and after 8 weeks. An intention-to-treat analysis was performed. Results The body weight decreased in both groups (4.07 ± 1.83 kg in the CCR group and 4.57 ± 2.21 kg in the ICR group) with no significant difference between the groups. There was no significant difference between the two groups in the reduced amount of fat mass, fat-free mass, and waist circumference. Both groups achieved a significant reduction in plasma triglycerides after 8 weeks (by 15.6 and 6.3% in ICR and CCR groups, respectively) with no difference between treatment groups. HOMA-IR improved significantly in ICR compared to the CCR group (P = 0.03). Plasma glucose, insulin, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, liver enzyme, and adiponectin were not different between the two groups. Conclusions The results of this short-term study suggest that three-days a week of the ICR is comparable to a CCR diet for the reduction of triglycerides level in patients with HTG and in the short-term it appears to be more effective than continuous dieting in improving insulin resistance. However, longer-term studies are needed to confirm these findings. Trial registration Trial registration number:NCT04143971.

scholarly journals 262 Heat stress alleviation and dynamic temperature measurement for growing beef cattle

2020 ◽  
Vol 98 (Supplement_4) ◽  
pp. 192-193
Author(s):  
Sheyenne M Augenstein ◽  
Meredith A Harrison ◽  
Sarah C Klopatek ◽  
James W Oltjen
Keyword(s):  
Heat Stress ◽  
Body Temperature ◽  
Beef Cattle ◽  
Ambient Temperature ◽  
The Body ◽  
Control Group ◽  
Temperature Threshold ◽  
Sprinkler Systems ◽  
Significant Difference ◽  
The Impact

Abstract Heat stress continues to be a challenge for feedlot producers, forcing physiological adaptations in beef cattle that can have a negative impact on gain and carcass quality. Feedlots may want to incorporate systems that aid in mitigating heat stress, including sprinkler systems, which are commonly found on dairies. The objective of this study was to determine the impact of sprinkler systems on the body temperature of growing feedlot steers applied at three different temperature thresholds. Thirty-two Angus-cross beef steers (298 ± 15 SD days of age) were randomly assigned to 8 pens. Treatments were assigned to pens according to location to avoid drainage issues, with one replicate located on the eastern side of the feedlot and the other replicate located on the western side. Treatments including no sprinklers (C), high temperature threshold sprinklers (HT), moderate temperature threshold sprinklers (MT) or low temperature threshold sprinklers (LT). Sprinklers (flow rate: 5.11 L/min) were activated at 33°C (HT), 28°C (MT), and 23°C (LT) for five minutes at corresponding temperatures every thirty minutes for 57 days. Rectal temperature of steers in their pens was measured in the morning (0800 h), afternoon (1500 h), and evening (1900 h) three days each week (Monday, Wednesday, Friday) for a total of 19 experimental days. Weather measurements, including ambient temperature, windspeed, humidity and solar radiation were recorded at each measurement time along with the maximum values for each day. The change in body temperature (ΔBT) between the morning and afternoon was affected by ambient temperature (P < 0.01); MT (P = 0.02) and LT (P = 0.02) – different than C. There was no significant difference between sprinkler treatments and the control group (P > 0.05). Day affected (ΔBT) between the morning and afternoon (P < 0.05) and the afternoon and evening (P < 0.05). When averaged by day, the control group was significantly higher than MT (P = 0.04) between the morning and afternoon. The control group was also significantly higher than LT between the morning and afternoon (P = 0.03) and the afternoon and evening (P < 0.01). The change in steer body temperature between afternoon and morning was affected by ambient temperature, and averaged across days, lowering the temperature threshold for sprinkling decreased in the afternoon and evening body temperature increase in steers.

Predation pressure, density-induced stress and tail regeneration: a casual-nexus situation or a bunch of independent factors?

2009 ◽  
Vol 30 (4) ◽  
pp. 471-482 ◽  
Author(s):  
Gerasimia Tsasi ◽  
Efstratios Valakos ◽  
Chrysi Simou ◽  
Panayiotis Pafilis
Keyword(s):  
Negative Impact ◽  
Predation Pressure ◽  
The Body ◽  
Defensive Strategy ◽  
Tail Regeneration ◽  
Regeneration Rate ◽  
Island Populations ◽  
Induced Stress ◽  
Significant Difference ◽  
The Impact

AbstractCaudal autotomy, the self-induced tail shedding from the body, is a common defensive strategy in lizards. Tail loss is followed rapidly by regeneration, revealing the importance of a fully functional tail. Predation pressure has been traditionally correlated with autotomy performance. However there is a lack of evidence regarding the impact of predation regime on tail regeneration. Another important factor that has been neglected is the population density. Though it is well established that crowding alters various life-history traits, the impact of density on caudal regeneration remains understudied. In this paper we compared three island populations of the Aegean Wall Lizard (Podarcis erhardii) that have evolved under different levels of predation pressure: whereas the Naxos population is exposed to numerous predators the Kopries and Daskalio islet populations experience low predation pressure. To evaluate the effect of density-induced stress on caudal regeneration, lizards were treated under two conditions of housing, in single and crowded (six individuals) terraria. Tail sheding occurred prior to this treatment following a standardised method. The length of regenerated tail was recorded weekly. Regeneration rate was higher in single terraria when compared to crowded, reflecting the negative impact of crowding. However we failed to detect any statistically significant difference between single and crowded terraria in the case of Naxos. We believe that the underlying reason must be the heavy predation pressure under which rapid tail regeneration, even under unfavourable conditions, is crucial for survival. It seems that the imperious need for regeneration counteracts density-induced stress.

Effects of Ascogregarina culicis (Eugregarinorida: Lecudinidae) on Mosquito Size and Dengue Virus Infection in Aedes aegypti (Diptera: Culicidae)

2020 ◽  
Author(s):  
Panpim Thongsripong ◽  
Dawn M Wesson
Keyword(s):  
Virus Infection ◽  
Aedes Aegypti ◽  
Dengue Virus ◽  
Infection Rate ◽  
Wing Length ◽  
The Body ◽  
Global Public Health ◽  
Dengue Virus Infection ◽  
Significant Difference ◽  
The Impact

Abstract Dengue virus infection, transmitted via mosquito bites, poses a substantial risk to global public health. Studies suggest that the mosquito’s microbial community can profoundly influence vector-borne pathogen transmissions, including dengue virus. Ascogregarina culicis (Ross) of the phylum Apicomplexa is among the most common parasites of Aedes aegypti (Linnaeus), the principal vector of dengue. Despite a high prevalence worldwide, including in the areas where dengue is endemic, the impact of A. culicis on Ae. aegypti vector competence for dengue virus is unknown. This study aimed to investigate the effects of A. culicis infection on mosquito size and fitness, as measured by wing length, and the susceptibility to dengue virus infection in Ae. aegypti. Our results showed that there was no statistically significant difference in wing lengths between Ae. aegypti infected and not infected with A. culicis. Furthermore, A. culicis infection did not significantly affect dengue virus infection or disseminated infection rate. However, there was a significant association between shorter wings and higher dengue virus infection rate, whereby a 0.1-mm increase in wing length decreased the odds of the mosquito being infected by 32%. Thus, based on our result, A. culicis infection does not influence the body size and dengue virus infection in Ae. aegypti. This study helps to shed light on a common but neglected eukaryotic mosquito parasite.

scholarly journals Relationship between body weight and leptin concentrations in mink dams and the birth parameters of kits

2016 ◽  
Vol 72 (12) ◽  
pp. 755-759 ◽  
Author(s):  
Monika Bryl ◽  
Hanna Bis-Wencel ◽  
Brygida Ślaska ◽  
Bożena Nowakowicz-Dębek ◽  
Zbigniew Bełkot ◽  
...  
Keyword(s):  
Body Weight ◽  
Body Condition ◽  
Scoring System ◽  
The Body ◽  
The Other ◽  
Blood Samples ◽  
Serum Leptin ◽  
Significant Difference ◽  
Analysis Of Results ◽  
The Impact

The aim of this study was to assess the impact of the leptin concentration and body weight of mink females on the birth parameters of their kits. Blood samples were collected 3 times during preparation for reproduction, 7±2 days before mating. Total leptin concentration in serum was measured using commercial RIA kits (Millipore, St. Charles, Missouri USA). Research was conducted on 20 clinically healthy scanbrown female minks (Neovison Vison) aged 2-3 years. To evaluate their body condition, the females were divided into two groups based on the BCS scoring system. In the first group, referred to as BCS 2, lean females were included, and the second group (BCS 4) consisted of obese females. In mink dams belonging to BCS 2, the average leptin values were one-fourth of those in the BCS 4 group. The results obtained indicate the influence of the body mass of minks during preparation for reproduction on serum leptin concentration. The results of the Mann-Whitney U test showed a statistically significant difference between weights and leptin concentrations in groups BCS 2 and BCS 4. Among the other traits, such differences were not found. The analysis of results obtained in the two mink groups did not reveal a clear relationship between leptin in the serum of mothers before mating and the birth parameters of their kits.

Clinical impact of obesity-related factors in perioperative management of esophageal cancer.

2018 ◽  
Vol 36 (4_suppl) ◽  
pp. 39-39
Author(s):  
HIROYA TAKEUCHI ◽  
Yuji Kikuchi ◽  
Hirofumi Kawakubo ◽  
Koichi Suda ◽  
Yuko Kitagawa
Keyword(s):  
Esophageal Cancer ◽  
Surgical Site Infection ◽  
Anastomotic Leakage ◽  
The Body ◽  
Obese Patients ◽  
Site Infection ◽  
Related Factors ◽  
Significant Difference ◽  
The Impact ◽  
High Bmi

39 Background: Obese patients with esophageal cancer have been increasing worldwide. However, the impact of obesity on esophagectomy still remains controversial. In this study, we clarified the relations between obesity and postoperative outcomes after esophagectomy in patients with esophageal cancer. Methods: A total of 215 patients who underwent esophagectomy for esophageal cancer between 2008 and 2014 were retrospectively assessed. We qualified the body mass index (BMI), visceral fat area (VFA) and subcutaneous fat area (SFA) using CYNAPSE VINCENT™. Clincopathological factors, postoperative morbidity, and survival after esophagectomy were assessed with these obesity-related factors. Results: The mean BMI, VFA, and SFA were 22.0 kg/m², 83.0cm², and 87.3cm². BMI, VFA and SFA were significantly correlated each other (P < 0.001). The prevalence of diabetes mellitus and hypertension were significantly more in high SFA than normal SFA (20% vs 10%, 30% vs 14%). When the patients were divided to two groups according to BMI (< 25 or ≥25kg/m²), VFA ( < 100 or ≥100cm²) and SFA ( < 100 or ≥100cm²), operative time was significantly longer in high SFA (P = 0.03) than normal SFA, and tended to be longer in high BMI, but blood loss were similar in each groups. Maximum level of postoperative CRP was significantly higher in high BMI (P < 0.001), in high VFA (P < 0.001), and in high SFA (P < 0.001). Length of systemic inflammatory response syndrome was significantly longer in high BMI than normal BMI (1.9 days vs 1.4 days P = 0.04), and length of ventilator support was significantly longer in high SFA than normal SFA (3.0 days vs 2.2 days P = 0.006). The incidence of anastomotic leakage and surgical site infection were significantly higher in high SFA than normal SFA (27% vs 10%, 37% vs 19%). There were no significant difference in overall survival, however, patients in high VFA tended to be longer survival than those in normal VFA (P = 0.078). Conclusions: Anastomotic leakage and surgical site infection occurred more frequently in high SFA. It might be useful to examine SFA preoperatively in obese patients with esophageal cancer for prevention of postoperative complications. Patients in high VFA tended to be longer survival than those in normal VFA.

ANALYTICAL SOLUTION OF WEDGE WATER ENTRY BY USING SCHWARTZ–CHRISTOFFEL CONFORMAL MAPPING

2011 ◽  
Vol 02 (03) ◽  
pp. 337-354 ◽  
Author(s):  
PARVIZ GHADIMI ◽  
AMIR SAADATKHAH ◽  
ABBAS DASHTIMANESH
Keyword(s):  
Conformal Mapping ◽  
Impact Force ◽  
Offshore Structures ◽  
Water Entry ◽  
The Body ◽  
Water Impact ◽  
Local Pressure ◽  
Maximum Impact Force ◽  
The Impact ◽  
First Time

Water impact is one of the most critical phenomena from the viewpoint of the structural design of ships and offshore structures. The impact force can impose a large load with high local pressure on the body surface. On the other hand, determination of the maximum impact force during impact and acting point itself is very important in the design of floats. In this paper, the water entry of a two-dimensional wedge section is considered. This study is carried out in the framework of a potential-flow assumption. In particular, water impact on a dropping wedge with a constant velocity is pursued analytically by using the Schwartz–Christoffel conformal mapping. In order to determine a position of the wedge where the instantaneous effective force is largest during the impact, a particular equation is introduced here for the first time. The pressure distribution and maximum impact force are also calculated. The obtained results are compared against other numerical and experimental works and favorable agreement is displayed.

Some insights into slamming forces: Compressible and incompressible phases

2000 ◽  
Vol 214 (6) ◽  
pp. 881-888 ◽  
Author(s):  
E F Campana ◽  
A Carcaterra ◽  
E Ciappi ◽  
A Iafrati
Keyword(s):  
Impact Force ◽  
Mass Parameter ◽  
Free Fall ◽  
The Body ◽  
Body Motion ◽  
Closed Form Expression ◽  
Surface Evolution ◽  
Entry Velocity ◽  
Wetted Area ◽  
The Impact

In the present paper the slamming force occurring in the free-fall impact of cylindrical bodies over the water surface is analysed in both compressible and incompressible stages. In the compressible phase the hydrodynamic analysis is carried out by the acoustic approximation and a closed-form expression for the impact force is recovered. The incompressible stage is approached through an unsteady boundary element method to compute the free surface evolution and the slamming force on the body. In both cases the hydrodynamic force is coupled to the rigid body motion to update the entry velocity of the body. The combined effect of the increasing wetted area and the reducing entry velocity leads to a maximum in the impact force that depends on the body mass. A parametric investigation shows that in the impact of a wedge section, if the maximum is reached either in the compressible or in the incompressible stages, a similar square root trend characterizes the dependence of this maximum on a non-dimensional mass parameter.

scholarly journals Penggunaan Larutan Pepaya (Carica papaya) sebagai Larvasida Nyamuk Aedes aegypty

2019 ◽  
Vol 7 (2) ◽  
pp. 59
Author(s):  
Restu Prastiwi ◽  
Anita Dewi Moelyaningrum ◽  
Prehatin T. N
Keyword(s):  
Experimental Study ◽  
Aedes Aegypti ◽  
Carica Papaya ◽  
Larval Growth ◽  
Hemorrhagic Fever ◽  
The Body ◽  
The Other ◽  
Control Group ◽  
Significant Difference ◽  
The Impact

<p><em>Aedes aegypti mosquito is a type of mosquito that can carry dengue virus that causes dengue fever. This mosquito has the potential to transmit dengue hemorrhagic fever (DHF). DHF is a disease characterized by sudden fever, bleeding both on the skin and in other parts of the body and can cause shock and death. So in order to reduce the impact of the disease, there are several ways that must be taken. One way of controlling that is done to reduce the population of aedes aegypti mosquitoes is by reducing larval growth by using a solution of papaya leaves as larvacide. Papaya leaves contain tannins of 0.12%. So it is possible to kill larvae. The purpose of this study was to analyze the differences in the average mortality of untreated instar 1 aedes aegypti larvae and treated with a solution of distilled papaya leaves, amounting to 0ml / 100ml (X0), 1ml / 100ml (X1), 2ml / 100ml (2) , 4ml / 100m (X3) with observations every 6 hours for 24 hours. This study is a true experimental study with the presentation of the data analyzed using the kruskal wallis test on spss. The results showed that there were differences between the control group and the treatment group (p &lt;0.05). The most significant difference occurred in the 4ml / 100ml (X3) group which had the highest mortality than the other groups. So the higher the concentration and the longer the duration of exposure, the higher the mortality rate in the larvae. </em></p>

scholarly journals The Effect of feeding swill feed supplemeted with chocolate cream waste on backfat thickness and body measurements in fattener weaner pigs

2019 ◽  
Vol 11 (1) ◽  
pp. 155-157
Author(s):  
D. Divyalakshmi ◽  
N. Kumaravelu ◽  
C. Balan ◽  
Thanga.Thamil Vanan ◽  
P. Tensingh Gnanaraj
Keyword(s):  
Weight Gain ◽  
Body Weight Gain ◽  
Market Price ◽  
The Body ◽  
Backfat Thickness ◽  
Time Interval ◽  
Body Measurements ◽  
Alternative Source ◽  
Significant Difference ◽  
The Impact

Pig rearing on concentrate feed may not be economical because of higher market price of raw materials. The alternative source could be the use of swill feeding. Consequently, the impact of the swill feed on the backfat thickness and body measurements calls for investigation against any other alternative feed.  Hence in the present study, an attempt has been made to compare the body measurements and backfat thickness in fattener piglets which were fed with swill feed (T1) vs. Those fed with chocolate cream waste supplemented with swill feed (T2). The statistical analysis of the data obtained in the present study revealed that there was highly significant (P?0.01) difference between body weight gain and backfat thickness (layer I and II) of both the group of piglets which were taken for trial starting from three months of age till five months of age. However, not significant difference (P?0.05) was noticed for body length and chest girth except in the pigs of 150 days age group. This study indicates that swill feed supplemented with chocolate cream waste could be used to reduce the feed cost since higher weight gain is achieved in a shorter time interval, increasing body measurements and backfat thickness compared to swill feed (T1) group of piglets.

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