Pulmonary functions of rats trained with mild exercise

Yokoyama, Eiji; Ichikawa, Isamu; Uchiyama, Iwao

doi:10.1016/0300-9629(84)90550-4

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…Previous studies have established that, with the activity intensity above certain levels, exercises -either voluntarily 20,21,30 or involuntarily [31][32][33] -increase food intake but reduce body weight gain when compared with sedentary controls, that is, exercises reduce feed efficiency. Furthermore, the serum cholesterol 34 and triglyceride 21,30,34 levels were lower and the organ weight of the lungs, hearts 33 and adrenal glands 21,33 was higher in rats that were exercised. In this study, the food intake of all the four rat groups that were on forced activity training was more than that of the two sedentary rat groups, and their mean body weight was comparable with that of the LC rats but less than that of the LS rats during and after the training period.…”

Section: Discussionmentioning

confidence: 99%

The effect of scheduled forced wheel activity on body weight in male F344 rats undergoing chronic circadian desynchronization

Tsai

2007

Int J Obes

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Objective: To examine whether scheduled forced wheel activity counteracts the increased body weight gain in rats undergoing chronic circadian desynchronization induced by repeated 12-h shifts in the light-dark cycle. Design: Four age-and body weight-matched groups of adult male F344 rats were subjected to 12-h intermittent forced wheel activity daily (2.2 km/day). Each group had the following schedule for 13 weeks: a fixed schedule of a daily 12:12-h light-dark cycle and activity training (WF); a fixed light-dark cycle and 12-h shifts twice a week in activity training (WS); 12-h shifts twice a week in the light-dark cycle and a fixed schedule of activity training (LSWF); and 12-h shifts twice a week in both the light-dark cycle and activity training (LSWS). Two additional age-and body weight-matched sedentary rat groups were selected from our database: one was maintained on a fixed light-dark cycle (LC) and the other was subjected to 12-h shifts twice a week in the light-dark cycle (LS). Results: The four rat groups that were exercised showed different response patterns of the daily body temperature rhythm to different combinations of forced activity and lighting schedules. Their food intake was more than that of the two sedentary rat groups, but their body weight was comparable with that of the LC rats and less than that of the LS rats during the forced activity period. The LSWS rats were heavier than the WF and WS rats in the first and second months of the experimental treatment, but their body weight was comparable with that of the WS and WF rats in the third month. Conclusion: Forced activity was effective in reducing the body weight gain in chronic circadian desynchronization that was induced by repeated shifts in the light-dark cycle, although such an effect might become significant only after some time.

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Section: Discussionmentioning

confidence: 99%

The effect of scheduled forced wheel activity on body weight in male F344 rats undergoing chronic circadian desynchronization

Tsai

2007

Int J Obes

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Ventilatory response to hypoxia in rats: gender differences

Mortola

Saiki

1996

Respiration Physiology

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Experimental Biology 1997 Symposium on Neurobiology of Thermoregulation: Role of Stress: EFFECT OF GENDER ON THERMOREGULATION AND SURVIVAL OF HYPOXIC RATS

Wood

Stabenau

1998

Clin Exp Pharma Physio

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1. Hypothermia is a documented response to hypoxia but little is known about possible gender differences. Because female rats have a greater hypoxic ventilatory response than males, we hypothesized that females would be more tolerant of hypoxia. We studied 18 female and 18 male Long-Evans rats. 2. Radiotelemetry transmitters for body temperature (Tb) were implanted under general anaesthesia (90 mg/mL ketamine and 10 mg/mL xylazine; 0.1 mL/100 g bodyweight, i.p.). 3. Rats were exposed to 21, 16, 12, 10, 8, 6, 4 and 2% O2 (balance N2) for 30 min each in chambers kept at either 31 degrees C (clamped) or 20 degrees C (hypothermic). Survival was defined as ataxic and unresponsive. 4. Females were more hypoxia tolerant than males, often enduring 2% inspired O2 (13 km altitude). 5. This was correlated with a lower Tb in the hypothermic group, but not in the clamped group. 6. Hypothermia increased 'survival' of rats independent of gender. 7. When Tb was clamped, female rats showed significantly greater survival than males. 8. Thus, separate mechanisms (hypothermia or ventilation) may be acting to increase tolerance of clamped and hypothermic female rats to severe hypoxia.

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Pulmonary functions of rats trained with mild exercise

Cited by 3 publications

References 11 publications

The effect of scheduled forced wheel activity on body weight in male F344 rats undergoing chronic circadian desynchronization

The effect of scheduled forced wheel activity on body weight in male F344 rats undergoing chronic circadian desynchronization

Ventilatory response to hypoxia in rats: gender differences

Experimental Biology 1997 Symposium on Neurobiology of Thermoregulation: Role of Stress: EFFECT OF GENDER ON THERMOREGULATION AND SURVIVAL OF HYPOXIC RATS

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