Marrow adipose tissue (MAT) accumulation with normal aging impacts the bone, hemopoiesis, and metabolic pathways. We investigated whether exercise was associated with lower MAT, as measured by vertebral marrow fat fraction (VFF) on magnetic resonance imaging. A total of 101 healthy individuals (54 females) aged 25 to 35 years without spine or bone disease but with distinct exercise histories were studied. Long-distance runners (67 km/wk, n = 25) exhibited lower mean lumbar VFF (27.9% [8.6%] versus 33.5% [6.0%]; p = 0.0048) than non-sporting referents (n = 24). In habitual joggers (28 km/wk, n = 30), mean lumbar VFF was 31.3% (9.0%) (p = 0.22 versus referents) and 6.0 percentage points lower than referents at vertebrae T , T , and T (p ≤ 0.023). High-volume road cycling (275 km/wk, n = 22) did not impact VFF. 3D accelerations corresponding to faster walking, slow jogging, and high-impact activities correlated with lower VFF, whereas low-impact activities and sedentary time correlated with higher mean lumbar VFF (all p ≤ 0.05). Given an estimated adipose bone marrow conversion of 7% per decade of life, long distance runners, with 5.6 percentage points lower VFF, showed an estimated 8-year younger vertebral marrow adipose tissue phenotype. Regression analysis showed a 0.7 percentage point reduction in mean lumbar VFF with every 9.4 km/wk run (p = 0.002). This study presents the first evidence in humans or animals that specific volumes and types of exercise may influence the age-determined adipose marrow conversion and result in low MAT. These results identify a potentially modifiable risk factor for prevalent chronic conditions related to bone metabolism, hemopoietic production, and other metabolic functions with potential global health applications. © 2017 American Society for Bone and Mineral Research.

The biodisposition kinetin and urinary excretion of kanamycin was investigated in eight normal adult female goats of beetle breed after intravenous close of 5 mg/kg to each gear. After single intravenous administration of kanamycin. in goats, the distribution half-life and biological hall-life had average of 8.1±0.893 min and 2.87±0.12 hrs and ranged between 4.28 to 11.61minutes and 2.44 to 3.37 hrs respectively. The aapparent volume of distribution of kanamycin in goat calculated by area method was 584.6±34.21 mg/kg. The rate constants for Lananivein transfer across compartment 1 to 2, K 12 and 2 to 1, K 21 were 1.846±0.316 hrG 1 and 3.800±0.434 hr and ranged between 1.016 to 3.713 hrG 1 and 2.45 to 5.77 hrG 1 , respectively. Total body clearance of kanarnycin calculated on per kg basis ranged 1.79 to 3.59 ml/min/kg with an average value 2.389±0.194 ml/min/kg, Cumulative urinary excretion as percent of total does excreated at 12 hours was 10.266±1.233. The studies showed variation in pharmacokinetic behaviour of kanamycia in indigenous goats as compared to earlier studies.