Related Experiment Videos
Exercise training alters feed efficiency and body composition in iron deficient rats
B W Tobin1, J L Beard, W L Kenney
1Nutrition Program and Noll Laboratory for Human Performance Research, Pennsylvania State University, University Park 16802.
Medicine and Science in Sports and Exercise
|January 1, 1993
Summary
Iron deficiency impairs exercise adaptation in rats, reducing growth and feed efficiency. While training benefits control rats, it exacerbates poor growth in iron-deficient animals, especially early on.
Area of Science:
- Exercise Physiology
- Nutritional Science
- Animal Models
Background:
- Iron deficiency (ID) is prevalent and can impact physical performance.
- The effects of exercise training on growth and metabolism in iron-deficient states are not fully understood.
Purpose of the Study:
- To investigate how exercise training affects body composition, feed efficiency, and growth in iron-deficient Sprague-Dawley rats.
Main Methods:
- 80 male rats were fed control (CN) or iron-deficient (ID) diets and assigned to sedentary (SD) or exercise (EX) groups for 6 or 12 weeks.
- Exercise involved treadmill running at 65% maximal oxygen consumption (VO2max).
- Body composition, feed efficiency, energy intake, and VO2max were measured.
Main Results:
- Iron deficiency prevented VO2max improvements with training, unlike in control rats.
- Iron-deficient exercised (IDEX) rats showed significantly lower growth rates and feed efficiency compared to sedentary controls.
- Exercise training reduced body fat in control rats at 6 weeks and iron-deficient rats at 12 weeks, with altered carcass protein in IDEX rats at 12 weeks.
Conclusions:
- Exercise training exacerbates poor growth in iron-deficient rats by negatively impacting food intake and feed efficiency, particularly in the initial training phases.
- While adaptations occur over time, severe iron deficiency hinders the benefits of exercise on physiological parameters and growth.