Showing papers on "Interval training published in 1978"

Specificity of metabolic and circulatory responses to arm or leg interval training.

Abstract: The purpose of this study was to evaluate metabolic and circulatory responses to interval training of legs or arms during steady-state, submaximal cycling. 15 college males cycled on a bicycle ergometer twice with arms (63 and 83 W) and twice with legs (100 and 125 W) before and following 5 weeks of daily interval training. Seven subjects trained with arm cycling and eight with leg cycling. Significant post-training decreases in submaximal oxygen consumption (\(\dot V\)O2), heart rate (HR), and venous blood lactate (LAv) were noted when cycling with trained and untrained muscles with the magnitude of change significantly greater with trained muscles. These results indicate metabolic and circulatory adaptations to interval training that are mediated centrally and peripherally. With respect to HR, but not \(\dot V\)O2, training a larger muscle mass (legs) produced a greater central but lesser peripheral effect whereas the opposite was true for the smaller arm muscles. The data also suggested that the peripheral adaptation involves a common mechanism controlling both HR and LAv changes with a separate mechanism controlling \(\dot V\)O2.

Metabolic responses of females to high intensity interval training of different frequencies.

Abstract: The purpose of this investigation was to examine the effects of frequency and distance of high intensity, interval training on females. Thirty-two females participated in an eight-week program of interval run training. Subjects were assigned to either a 2 day/week or a 4 day/week group, as well as a high intensity, short distance (50,101,201 meters), or high intensity longer distance (604, 805, 1208 meters) group. Estimates of training intensity were 170% and 130% Vo2max for the short and longer distance groups, respectively. Maximal and submaximal measures of oxygen consumption (Vo2), heart rate (HR), and venous blood lactic acid were determined prior to and following the training program. After training, there was a significant increase (P less than 0.01) in Vo2max (13%) (deltax = 0.32 1/min or 5.2 ml/kg.min). Maximal VE increased approximately 12% after training (P less than 0.01). Max HR, max lactic acid, and submax Vo2 were not altered by the training. However, HR submax decreased significantly (P less than .05) after training by approximately 6%. Analysis of coveriance indicated that these changes were independent of training frequency, distance, and intensity. It was concluded that the changes in aerobic power and submaximal HR of females are independent of frequency, distance, and intensity of high-intensity interval training programs.

Feasibility and effect of physical training with maximum intensity in men after acute myocardial infarction.

Abstract: The purpose of the present investigation was to study the feasibility and effect of physical training with maximum intensity in a group of symptomfree male postinfarction patients (n = 15). The patients started training one month after discharge after acute myocardial infarction (AMI). The training was carried out as interval training 2 X 60 min a week during 12 months. During each session there were 5-6 intervals of 6 min's duration, during which the patients exercised with maximum intensity. The results were compared to those of an untrained control group. The groups were randomly selected. Compared to the first exercise test in the third week after AMI the final work capacity of the trained patients was increased by 101%--to 1570 kpm/min (257 W), and that of the control patients by 25%--to 1042 kpm/min. (170 W). (P less than 0.01). The corresponding estimated maximal oxygen consumption was 32 and 48 ml/kg . min. respectively. The study demonstrates that training with maximum intensity is feasible in these patients and that the work capacity, which was obtained, was 30-40% higher than usually found after training of postinfarction patients, when submaximal training intensity has been employed.