I H Jonsdottir1, P Hoffmann. 1. Institute of Physiology and Pharmacology, Department of Physiology, Göteborg University, Sweden. inga.jons@fysiologi.gu.se
Abstract
PURPOSE: The purpose of this study was to examine a) the relationship between running distance (km x d(-1)) and b) the duration of exercise training in weeks on the effects on natural immune function in spontaneously hypertensive rats (SHR). METHODS: Exercise consisted of voluntary running in wheels for 5 or 11 wk. In vivo cytotoxicity was measured as clearance of injected 51Cr-labeled YAC-1 lymphoma cells from the lungs. RESULTS: Increased in vivo cytotoxicity was seen after 5 wk of exercise (P < 0.001) but not after voluntary exercise for 11 wk. If the wheels were locked 3 d x wk(-1) during the last 6 wk of running, thus restricting the exercise to 4 d x wk(-1), the exercise-induced immunoenhancement seen after 5 wk of exercise was maintained also after 11 wk of exercise. When compared with the sedentary controls after 5 wk of exercise, all runners regardless of running distance exhibited significantly higher in vivo clearance of tumor cells from the lungs, and no overall significant correlation was seen between running distance and retained radioactivity. However, the lowest activity runners (< 4 km x d(-1)) exhibited significantly lower in vivo clearance of tumor cells from the lungs when compared with animals running more than 4 km x d(-1). CONCLUSION: We conclude that the duration of exercise training, and to some extent the running distance, has significant effects on the training-induced increase in natural immune function in rats. Furthermore, we conclude that a resting or recovery period during long-term exercise training is important to maintain the immunoenhancing effects in response to exercise.
PURPOSE: The purpose of this study was to examine a) the relationship between running distance (km x d(-1)) and b) the duration of exercise training in weeks on the effects on natural immune function in spontaneously hypertensiverats (SHR). METHODS: Exercise consisted of voluntary running in wheels for 5 or 11 wk. In vivo cytotoxicity was measured as clearance of injected 51Cr-labeled YAC-1lymphoma cells from the lungs. RESULTS: Increased in vivo cytotoxicity was seen after 5 wk of exercise (P < 0.001) but not after voluntary exercise for 11 wk. If the wheels were locked 3 d x wk(-1) during the last 6 wk of running, thus restricting the exercise to 4 d x wk(-1), the exercise-induced immunoenhancement seen after 5 wk of exercise was maintained also after 11 wk of exercise. When compared with the sedentary controls after 5 wk of exercise, all runners regardless of running distance exhibited significantly higher in vivo clearance of tumor cells from the lungs, and no overall significant correlation was seen between running distance and retained radioactivity. However, the lowest activity runners (< 4 km x d(-1)) exhibited significantly lower in vivo clearance of tumor cells from the lungs when compared with animals running more than 4 km x d(-1). CONCLUSION: We conclude that the duration of exercise training, and to some extent the running distance, has significant effects on the training-induced increase in natural immune function in rats. Furthermore, we conclude that a resting or recovery period during long-term exercise training is important to maintain the immunoenhancing effects in response to exercise.
Authors: Helaine M Alessio; Natalie B Schweitzer; Angela M Snedden; Phyllis Callahan; Ann E Hagerman Journal: J Am Assoc Lab Anim Sci Date: 2009-05 Impact factor: 1.232
Authors: Cesar Miguel Momesso Dos Santos; Vinicius Leonardo Sousa Diniz; André Luis Lacerda Bachi; Laiane Cristina Dos Santos de Oliveira; Tamara Ghazal; Maria Elizabeth Pereira Passos; Heloisa Helena de Oliveira; Gilson Murata; Laureane Nunes Masi; Amanda Roque Martins; Adriana Cristina Levada-Pires; Rui Curi; Sandro Massao Hirabara; Donald F Sellitti; Tania Cristina Pithon-Curi; Renata Gorjão Journal: Nutr Metab (Lond) Date: 2019-09-12 Impact factor: 4.169