scholarly journals The Effects of Sex and Chronic Restraint on Instrumental Learning in Rats

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Angela L. McDowell ◽  
Kathryn M. Heath ◽  
Preston E. Garraghty
Keyword(s):  
Body Weight ◽  
Chronic Stress ◽  
Instrumental Learning ◽  
Transfer Task ◽  
Adult Rats ◽  
Appetitive Learning ◽  
Reduced Body ◽  
Body Weight Data ◽  
Daily Body Weight ◽  
Task Differences

Chronic stress has been shown to impact learning, but studies have been sparse or nonexistent examining sex or task differences. We examined the effects of sex and chronic stress on instrumental learning in adult rats. Rats were tested in an aversive paradigm with or without prior appetitive experience, and daily body weight data was collected as an index of stress. Relative to control animals, reduced body weight was maintained across the stress period for males (−7%, P≤.05) and females (−5%, P≤.05). For males, there were within-subject day-by-day differences after asymptotic transition, and all restrained males were delayed in reaching asymptotic performance. In contrast, stressed females were facilitated in appetitive and aversive-only instrumental learning but impaired during acquisition of the aversive transfer task. Males were faster than females in reaching the appetitive shaping criterion, but females were more efficient in reaching the appetitive tone-signaled criterion. Finally, an effect of task showed that while females reached aversive shaping criterion at a faster rate when they had prior appetitive learning, they were impaired in tone-signaled avoidance learning only when they had prior appetitive learning. These tasks reveal important nuances on the effect of stress and sex differences on goal-directed behavior.

scholarly journals Sex Differences and the Impact of Chronic Stress and Recovery on Instrumental Learning

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Angela L. McDowell ◽  
Kathryn M. H. Fransen ◽  
Kevin S. Elliott ◽  
Alhasan Elghouche ◽  
Polina V. Kostylev ◽  
...  
Keyword(s):  
Body Weight ◽  
Sex Differences ◽  
Chronic Stress ◽  
Instrumental Learning ◽  
Response Speed ◽  
Reduced Body ◽  
Body Weight Data ◽  
Daily Body Weight ◽  
Appetitive Response ◽  
The Impact

We have previously shown that 21-day chronic restraint stress impacts instrumental learning, but overall few studies have examined sex differences on the impact of stress on learning. We further examined sex differences in response to extended 42-day chronic stress on instrumental learning, as well as recovery from chronic stress. Rats were tested in aversive training tasks with or without prior appetitive experience, and daily body weight data was collected as an index of stress. Relative to control animals, reduced body weight was maintained from day 22 through day 42 across the stress period for males, but not for females. Stressed males had increased response speed and lower learning efficiency during appetitive acquisition and aversive learning. Males overall showed slower escape shaping times and more shock exposure. In contrast, stressed females showed slower appetitive response speeds and higher appetitive and aversive efficiency but overall reduced avoidance rates during acquisition and maintenance for transfer animals and during maintenance for aversive-only animals. These tasks reveal important nuances on the effect of stress on goal-directed behavior and further highlight sexually divergent effects on appetitive versus aversive motivation. Furthermore, these data underscore that systems are temporally impacted by chronic stress in a sexually divergent pattern.

Effect of repeated stress on body weight and body composition of rats fed low- and high-fat diets

1998 ◽  
Vol 275 (6) ◽  
pp. R1928-R1938 ◽  
Author(s):  
Ruth B. S. Harris ◽  
Jun Zhou ◽  
Bradley D. Youngblood ◽  
Igor I. Rybkin ◽  
Gennady N. Smagin ◽  
...  
Keyword(s):  
Weight Loss ◽  
Body Weight ◽  
Food Intake ◽  
High Fat Diet ◽  
Corn Oil ◽  
Coconut Oil ◽  
High Fat ◽  
Adult Rats ◽  
Reduced Body ◽  
Fat Diets

Exposure to the moderate stressor of 3-h restraint for 3 consecutive days causes a temporary drop in food intake but a permanent reduction in body weight in adult rats. Young rats did not show the same response. Food intake of adult rats exposed to repeated restraint was significantly lower than that of controls for 4 days after the end of stress, and there was no rebound hyperphagia. Body weight remained significantly lower for at least 40 days after stress. When the rats were fed a high-fat diet of 80% chow and 20% vegetable shortening (48% kcal fat, 16% protein), lean body mass accounted for all of the weight loss in stressed rats. When the experiment was repeated with a purified high-fat diet containing corn oil and coconut oil as the source of fat (41% kcal fat, 16% protein), weight loss consisted of both lean and fat tissue. There were no sustained changes in single time point measures of corticosterone, insulin, or leptin that could account for the reduced body weight in these rats.

Production and heart rate responses of chickens beak-trimmed at hatch or at 10 or 42 days of age

1994 ◽  
Vol 34 (4) ◽  
pp. 443 ◽  
Author(s):  
PC Glatz ◽  
CA Lunam
Keyword(s):  
Heart Rate ◽  
Body Weight ◽  
Stress Response ◽  
Food Intake ◽  
Chronic Stress ◽  
Heart Rate Response ◽  
Reduced Body ◽  
Before And After ◽  
Beak Trimming

Heart rate was monitored before and after beak trimming in restrained chickens to measure responses to beak trimming at hatch and at 10 and 42 days of age. Immediately after trimming chickens sham-trimmed (control) and trimmed at 10 and 42 days of age had an increase in heart rate, with the 42-day-old chickens showing the greater change. Chickens sham-trimmed and trimmed at hatch showed no change in heart rate. No difference between trimmed and sham-trimmed chickens occurred at any age for heart rate response. These data indicate that heart rate at trimming may be inadequate as a measure of the stress response associated with beak trimming, especially with the concurrent stressors of handling and restraint. Beak trimming and handling of chickens at hatch is either less stressful than trimming at 10 and 42 days of age, as indicated by the lack of a heart rate response, or heart rate is already at a maximum in chickens at hatch, due to stress associated with hatching. Food intake and body weight were measured for 3-4 weeks after trimming to assess the longer term effects of age and level of trimming on performance of the chicken. Removal of 3 mm of beak at hatch or 4.5 mm at 10 days of age depressed feeding levels and a reduced body weight, indicative of a chronic stress associated with beak trimming.

Abstract 17193: Effect of Long Term Canagliflozin Use on Body Weight and Blood Pressure: A Systematic Review and Meta-Analysis

Circulation ◽  
2018 ◽  
Vol 138 (Suppl_1) ◽  
Author(s):  
Muhammad S Khan ◽  
Tariq J Siddiqi ◽  
Muhammad S Usman ◽  
Muhammad M Memon ◽  
Sadiya S Khan ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Body Weight ◽  
Meta Analysis ◽  
Final Analysis ◽  
Reduced Body ◽  
Body Weight Data ◽  
Chi Squared ◽  
Mean Differences ◽  
Dose Dependent

Introduction: Although Canagliflozin, an FDA-approved sodium-glucose cotransporter 2 inhibitor (SGLT2i), is known to reduce body weight and blood pressure (BP) in the short-term, it is unclear whether this effect persists in the long-term. Furthermore, it remains uncertain whether the reduction in BP and body weight is dose-dependent. Objective: To conduct a meta-analysis to study the effects of long term Canagliflozin use on BP and body weight in type 2 diabetes mellitus (T2DM) patients and stratify the results by dosage. Methods: MEDLINE and Scopus were queried in May 2018 for randomized controlled trials (RCTs) of Canagliflozin that had a follow-up period of at least one year and reported change in BP and percentage change in body weight. Data from included studies were pooled using a random effects model and results were presented as weighted mean differences (WMDs) with 95% confidence intervals (CIs). Subgroup analysis according to dosage (100mg/300mg) was performed. Chi-squared test was conducted to test for subgroup differences. Results: Five RCTs (N=15,230 participants) were included in the final analysis. Canagliflozin also led to significant reduction in body weight when compared to controls (WMD: -3.32% [-4.04, -2.60]; p<0.001); however, this effect was not found to be dose-dependent (p=0.76). Both systolic (WMD: -4.40 mmHg [-5.18, -3.62]; p<0.001) and diastolic (WMD: -1.68 mmHg [-2.14, -1.23]; p<0.001) BP were significantly lower with long-term canagliflozin use, when compared to placebo (Figure 1). This effect was significantly stronger in the 300mg subgroup, when compared to the 100mg subgroup for both systolic (p=0.02) and diastolic (p=0.01) BP. There was no significant change in the risk of hypotension with the use of canagliflozin (Odds ratio: 1.59 [0.80, 3.19]; p=0.19). Conclusion: Long-term Canagliflozin is associated with reduced body weight and may be one mechanism for the beneficial BP response observed . Favorable changes in body weight and BP may be responsible for improved cardiovascular outcomes in T2DM patients with Canagliflozin.

scholarly journals The Effect of Dietary Halloysite Supplementation on the Performance of Broiler Chickens and Broiler House Environmental Parameters

Animals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 2040
Author(s):  
Małgorzata Nadziakiewicz ◽  
Marcin Wojciech Lis ◽  
Piotr Micek
Keyword(s):  
Body Weight ◽  
Broiler Chickens ◽  
Body Weight Gain ◽  
Environmental Parameters ◽  
Feed Consumption ◽  
Feed Additive ◽  
Feed Conversion ◽  
Daily Body Weight ◽  
Daily Water ◽  
Broiler House

The aim of the study was to determine the effect of supplementing broiler chickens’ diets with halloysite on daily body weight gain (BWG), feed conversion ratio (FCR), daily water consumption (DWC), and some broiler house hygiene parameters. The trial was conducted on 18,000 broiler chickens divided into two groups throughout the 42-day (D) rearing period. The birds were fed complete diets without (group C) or with halloysite addition (1%, group E) from D8 of rearing. No difference in the mortality rate was observed between groups C and E. Birds from group E had a tendency (0.05 < p < 0.10) towards a higher body weight at D32 and D42, a higher BWG, and a lower FCR compared to group C during the entire rearing period. Average DWC differed only in the finisher period, with a tendency towards lower overall DWC in group E. The concentration of ammonia in the air from D21 to D35 was increased more than 5-fold in group C but only 1.5-fold in group E. In conclusion, the use of halloysite as a feed additive in the diet of broiler chickens resulted in a reduction in feed consumption per unit of BWG and higher utilisation of crude protein, which led to improved environmental conditions.

scholarly journals Effect of workplace physical activity interventions on the cardio-metabolic health of working adults: systematic review and meta-analysis

2019 ◽  
Vol 16 (1) ◽  
Author(s):  
Rubina Mulchandani ◽  
Ambalam M. Chandrasekaran ◽  
Roopa Shivashankar ◽  
Dimple Kondal ◽  
Anurag Agrawal ◽  
...  
Keyword(s):  
Physical Activity ◽  
Systematic Review ◽  
Blood Pressure ◽  
Body Weight ◽  
Waist Circumference ◽  
Meta Analysis ◽  
Workplace Interventions ◽  
Working Adults ◽  
Reduced Body ◽  
Physical Activity Interventions

Abstract Background Adults in urban areas spend almost 77% of their waking time being inactive at workplaces, which leaves little time for physical activity. The aim of this systematic review and meta-analysis was to synthesize evidence for the effect of workplace physical activity interventions on the cardio-metabolic health markers (body weight, waist circumference, body mass index (BMI), blood pressure, lipids and blood glucose) among working adults. Methods All experimental studies up to March 2018, reporting cardio-metabolic worksite intervention outcomes among adult employees were identified from PUBMED, EMBASE, COCHRANE CENTRAL, CINAHL and PsycINFO. The Cochrane Risk of Bias tool was used to assess bias in studies. All studies were assessed qualitatively and meta-analysis was done where possible. Forest plots were generated for pooled estimates of each study outcome. Results A total of 33 studies met the eligibility criteria and 24 were included in the meta-analysis. Multi-component workplace interventions significantly reduced body weight (16 studies; mean diff: − 2.61 kg, 95% CI: − 3.89 to − 1.33) BMI (19 studies, mean diff: − 0.42 kg/m2, 95% CI: − 0.69 to − 0.15) and waist circumference (13 studies; mean diff: − 1.92 cm, 95% CI: − 3.25 to − 0.60). Reduction in blood pressure, lipids and blood glucose was not statistically significant. Conclusions Workplace interventions significantly reduced body weight, BMI and waist circumference. Non-significant results for biochemical markers could be due to them being secondary outcomes in most studies. Intervention acceptability and adherence, follow-up duration and exploring non-RCT designs are factors that need attention in future research. Prospero registration number: CRD42018094436.

scholarly journals Estimating my equilibrium energy intake during lockdown: very introspective study

BMJ ◽  
2020 ◽  
pp. m4561
Author(s):  
R A Lewis
Keyword(s):  
Body Weight ◽  
Energy Intake ◽  
Outcome Measures ◽  
Dietary Energy ◽  
Saturday Morning ◽  
Dietary Energy Intake ◽  
Body Weight Data ◽  
Tuesday Afternoon ◽  
Weight Data ◽  
At Home

AbstractObjectiveTo estimate the daily dietary energy intake for me to maintain a constant body weight. How hard can it be?DesignVery introspective study.SettingAt home. In lockdown. (Except every Tuesday afternoon and Saturday morning, when I went for a run.)ParticipantsMe. n=1.Main outcome measuresMy weight, measured each day.ResultsSleeping, I shed about a kilogram each night (1.07 (SD 0.25) kg). Running 5 km, I shed about half a kilogram (0.57 (SD 0.15) kg). My daily equilibrium energy intake is about 10 000 kJ (10 286 (SD 201) kJ). Every kJ above (or below) 10 000 kJ adds (or subtracts) about 40 mg (35.4 (SD 3.2) mg).ConclusionsBody weight data show persistent variability, even when the screws of control are tightened and tightened.

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