Physiological Adaptations to Progressive Endurance Exercise Training in Adult and Aged Rats: Insights from the Molecular Transducers of Physical Activity Consortium (MoTrPAC)

While regular physical activity is a cornerstone of health, wellness, and vitality, the impact of endurance exercise training on molecular signaling within and across tissues remains to be delineated. The Molecular Transducers of Physical Activity Consortium (MoTrPAC) was established to characterize molecular networks underlying the adaptive response to exercise. Here, we describe the endurance exercise training studies undertaken by the Preclinical Animal Sites Studies component of MoTrPAC, in which we sought to develop and implement a standardized endurance exercise protocol in a large cohort of rats. To this end, Adult (6-mo) and Aged (18-mo) female (n = 151) and male (n = 143) Fischer 344 rats were subjected to progressive treadmill training (5 d/wk, ∼70%-75% VO2max) for 1, 2, 4, or 8 wk; sedentary rats were studied as the control group. A total of 18 solid tissues, as well as blood, plasma, and feces, were collected to establish a publicly accessible biorepository and for extensive omics-based analyses by MoTrPAC. Treadmill training was highly effective, with robust improvements in skeletal muscle citrate synthase activity in as little as 1-2 wk and improvements in maximum run speed and maximal oxygen uptake by 4-8 wk. For body mass and composition, notable age- and sex-dependent responses were observed. This work in mature, treadmill-trained rats represents the most comprehensive and publicly accessible tissue biorepository, to date, and provides an unprecedented resource for studying temporal-, sex-, and age-specific responses to endurance exercise training in a preclinical rat model

sj-doc-1-imj-10.1177_10815589231225183 – Supplemental material for Rosiglitazone improves insulin resistance but does not improve exercise capacity in individuals with impaired glucose tolerance: A randomized clinical study

Supplemental material, sj-doc-1-imj-10.1177_10815589231225183 for Rosiglitazone improves insulin resistance but does not improve exercise capacity in individuals with impaired glucose tolerance: A randomized clinical study by Layla A Abushamat, Irene E Schauer, Cecilia C Low Wang, Stacey Mitchell, Leah Herlache, Mark Bridenstine, Roy Durbin, Janet K Snell-Bergeon, Judith G Regensteiner and Jane EB Reusch in Journal of Investigative Medicine</p

Sex Differences in Physical Activity Among Individuals with Type 2 Diabetes Across the Lifespan: A Systematic Review and Meta-Analysis

   Background: Physical activity (PA) is a cornerstone of type 2 diabetes mellitus (T2DM) treatment. Sex differences in PA behavior or barriers/facilitators to PA among individuals with T2DM are unclear. Purpose: To summarize the evidence related to sex differences in participation in PA and barriers/facilitators to PA among individuals with T2DM across the lifespan. Data Source: Systematic searches (CRD42021254246) were conducted using Ovid Medline, EMBASE, Web of Science, CINAHL, AMED, PsychINFO, and SPORTDiscus. Study Selection: Studies assessing PA, sedentary behaviors (SB) or barriers/facilitators to PA among individuals with T2DM by sex or gender. Data Extraction: Participant characteristics, meeting PA guidelines, participation in PA and SB, and barriers/facilitators to PA were extracted by two independent reviewers.  Data Synthesis: Fifty-three articles (65,344 participants) were included in the systematic review; 21 articles in the meta-analysis. Sex differences were not observed in meeting PA guidelines among adolescents (OR [95% CI], 0.70 [0.31, 1.59]), but males were more likely than females to meet PA guidelines among adults (1.65 [1.36, 2.01]) and older adults (1.63 [1.27, 2.09]). Males performed more moderate to vigorous PA (MVPA) than females across all age groups. Common barriers were lack of time (men) and lack of social support and motivation (women).  Limitations: Limitations include heterogeneity of measures used to assess PA and lack of stratification of data by sex. Conclusions: Sex differences in meeting PA guidelines were not observed among adolescents, but were apparent among adults and older adults with T2DM. Females consistently engaged in less MVPA than males across the lifespan.</p