Cardiorespiratory and metabolic costs of continuous and intermittent exercise in man

Edwards, R. H. T.; Ekelund, Lars‐Göran; Harris, Roger C.; Hesser, C. M.; Hultman, E.; Melcher, A.; Wigertz, Ove

doi:10.1113/jphysiol.1973.sp010356

Cited by 37 publications

(17 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The r 2 of >60% was consistent with but greater than that of 29% reported previously for explaining the determination of exercise endurance capacity with breathlessness intensity in competitive cyclists for performing intense continuous exercise (Harms et al 2000). Edwards et al (1973) reported that the ventilatory demands during exercise and recovery The time courses for the minute ventilation of 12-s exercise (ex) and 18-s recovery (rec) under CON and UL breathing conditions. All values from 2 to 6 min were significantly different from the value at the Final in the same trial.…”

Section: -S Exsupporting

confidence: 85%

Reduced sensations of intensity of breathlessness enhances maintenance of intense intermittent exercise

Tong

Quach

et al. 2004

Eur J Appl Physiol

View full text Add to dashboard Cite

To identify the effect of normal breathlessness sensation elicited during intense intermittent exercise at exhaustion on limitation of exercise maintenance (Ex), the contribution of the flow-resistive unloading effect of normoxic helium-oxygen breathing on the breathlessness sensation to the change in the Ex was examined. Seven men repeatedly performed 12-s exercise at 160% maximal aerobic power output followed by passive recovery for 18-s under normal (CON) and unloaded (UL) breathing conditions until exhaustion. In UL, Ex was enhanced [mean (SD) 127.2 (11.8)% CON] concomitantly with reduction in averaged peak inhaled mouth pressure (PPmi) of recorded breathing cycles that reflected approximate true inspiratory muscle force output. At the iso-time point of CON exhaustion, the reduction in PPmi to [75.7(10.2)% CON] in UL was concomitant with the reductions in the rating of perceived breathlessness (RPB) [87.5 (13.1)% CON] and in the slope of time course for RPB (RPB/2-min period) [82.1 (17.2)% CON]. It was also concomitant with increases in ventilation and total oxygen consumption. However, the augmented oxygen consumption did not result in lowering of subjects' metabolic stress that was indicated by accumulations of blood lactate and plasma ammonia and uric acid. Nevertheless, the reductions in the RPB and RPB/2-min period, which reflected the breathlessness intensity, were correlated to the CON Ex enhancement in UL (RPB r=-0.57, RPB/2-min period r=-0.83; P<0.05). These findings implied that the normal noxious breathlessness sensation elicited during intense intermittent exercise at exhaustion might contribute to the limitation of subjects' exercise maintenance.

show abstract

Section: -S Exsupporting

confidence: 85%

Reduced sensations of intensity of breathlessness enhances maintenance of intense intermittent exercise

Tong

Quach

et al. 2004

Eur J Appl Physiol

View full text Add to dashboard Cite

show abstract

“…Despite this, the rate of carbohydrate oxidation observed during intermittent exercise was apparently not slowed to the extent proposed by Essen et al (1977). This outcome is supported by the higher R and circulating lactate accumulation observed in intermittent intense compared to continuous submaximal exercise with the same average power output (Edwards et al 1973).…”

Section: Discussionmentioning

confidence: 75%

A comparison of skeletal muscle oxygenation and fuel use in sustained continuous and intermittent exercise

Christmass¹,

Dawson

Passeretto

et al. 1999

Eur J Appl Physiol

View full text Add to dashboard Cite

In this study we compared substrate oxidation and muscle oxygen availability during sustained intermittent intense and continuous submaximal exercise with similar overall (i.e. work and recovery) oxygen consumption (VO2). Physically active subjects (n = 7) completed 90 min of an intermittent intense (12 s work:18 s recovery) and a continuous submaximal treadmill running protocol on separate days. In another experiment (n = 5) we compared oxygen availability in the vastus lateralis muscle between these two exercise protocols using near-infrared spectroscopy. Initially, overall VO(2) (i.e. work and recovery) was matched, and from 37.5 min to 67.5 min of exercise was similar, although slightly higher during continuous exercise (8%; P < 0.05). Energy expenditure was constant (22.5-90 min of exercise) and was not different in intermittent intense [0.81 (0.01) kJ x min(-1). kg(-1)] and continuous submaximal [0.85 (0.01) kJ x min(-1) x kg(-1)] exercise. Overall exercise intensity, represented as a proportion of peak aerobic power (VO2(peak)), was 68.1 (2.5)% VO2(peak) and 71.8 (1.8)% VO2(peak) for intermittent and continuous exercise protocols, respectively. Fat oxidation was almost 3 times lower (P < 0.05) and carbohydrate oxidation was approximately 1.2 times higher (P < 0.05) during intermittent compared to continuous exercise, despite the same overall energy expenditure. Capillary plasma lactate was constant from 15 to 90 min of exercise, and pyruvate was constant from 15 to 75 min, although both were higher (P < 0.0001, lactate; P < 0.001, pyruvate) during intermittent [5.05 (0.28) mM, 200 (7) microM, respectively] compared to continuous exercise [2.41 (0.10) mM, 114 (4) microM, respectively]. There was no difference between protocols for either plasma glycerol or non-esterified fatty acids. The decrease in muscle oxygenation during work periods of intermittent exercise resulted in a lower nadir oxygenation [54.62 (0.41)%] compared to continuous exercise [58.82 (0.21)%, P < 0.001]. The decline in oxygenation was correlated with treadmill speed (r = 0.72; P < 0.05). These results show a difference in substrate utilisation and muscle oxygen availability during sustained intermittent intense and continuous submaximal exercise, despite a similar overall VO(2) and identical energy expenditure.

show abstract

“…A method to stress the adaptive mechanisms of aerobic and anaerobic metabolisms during a training session is to design alternating periods of work and rest (Edwards et al, 1973). In this method, the work/rest ratio determines the physiological impact of intermittent efforts (Balsom, Seger, Sjodin & Ekblom, 1992;Hargreaves et al, 1998;Ratel, Bedu, Hennegrave, & Armstrong, 2002).…”

mentioning

confidence: 99%

Specific Circuit Training in Young Judokas

Baudry

Roux²

2009

Research Quarterly for Exercise and Sport

View full text Add to dashboard Cite

Ten adolescent judokas performed circuit training consisting of six 40-s periods ofjudo exercises separated by 40 s (CT1:1), 120 s (CT1:3), or 200 s (CT1:5) of rest. Heart rate, blood lactate concentration, and the number of repetitions were recorded. Heart rate reached approximately 180 beats x min(-1) at the end of work periods, with slightly lower values for CT1:5. Blood lactate concentration increased until the 6th and 5th work periods for CT1:1 and CT1:3, respectively, whereas the peak value was lower and achieved earlier for CT1:5. Conversely, the number of repetitions was greater during CT1:5. These results suggest that circuit training composed of judo exercises substantially affects aerobic and anaerobic metabolisms, with relative contributions depending on the rest duration.

show abstract

Cardiorespiratory and metabolic costs of continuous and intermittent exercise in man

Cited by 37 publications

References 35 publications

Reduced sensations of intensity of breathlessness enhances maintenance of intense intermittent exercise

Reduced sensations of intensity of breathlessness enhances maintenance of intense intermittent exercise

A comparison of skeletal muscle oxygenation and fuel use in sustained continuous and intermittent exercise

Specific Circuit Training in Young Judokas

Contact Info

Product

Resources

About