Hormonal and metabolic response to three types of exercise of equal duration and external work output

Vanhelder, W. P.; Radomski, M. W.; Goode, R. C.; Casey, Kenneth R.

doi:10.1007/bf02337175

Cited by 44 publications

(25 citation statements)

References 20 publications

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“…On the other hand, significant GH rise between rest, and the exercise period observed in both groups, is justified by GH participation in mobilisation of energetic substrates during exercise -FFA, activation of glycogenolysis and gluconeogenesis. This action can thus be important not only during prolonged exercise (as other authors suggest), [6,17,31,32,33,34], but also during short exercises (intense, anaerobic).…”

Section: Discussionmentioning

confidence: 86%

The influence of physical exercise on alterations in concentrations of neuropeptide Y, leptin and other selected hormonal and metabolic parameters in sportspeople

Zajadacz¹,

Skarpańska-Stejnborn²,

Brzenczek-Owczarzak³

et al. 2009

Biol Sport

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Abstract. The aim of this study was to evaluate the behaviour and relationships between hormones, and metabolic blood parameters essential for energetic balance control during rest, exercise and restitution. Two groups of young boys (17 cyclists and 11 canoeists) were tested twice. Tests were performed on a cycloergometer. During the first study, anaerobic threshold was determined by a non-invasive method and in the second one -cyclists performed prolonged 2-hour exercise below anaerobic threshold and canoeists -20-min effort above anaerobic threshold. Neuropeptide Y (NPY), leptin, insulin, C-peptide, metabolic clearance of insulin, growth hormone (GH), somatomedin C (IGF1) and glycaemia were analysed. Values of NPY and GH measured directly after exercise were significantly higher than the values of these parameters at rest, in both groups. However, effort did not cause significant changes in leptin concentration and insulin clearance in both groups. Besides, it was shown that 20-min exercise had no influence on insulin concentration in canoeists blood. In these studies significantly lower IGF1 value during restitution than directly after exercise was also noted in the cyclists group. Relations between measured hormonal parameters indicate that some mechanisms, which supply the organism with necessary energetic substrates during the effort, and accelerate the restitution are activated.(Biol.Sport 26:309-324, 2009)

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Section: Discussionmentioning

confidence: 86%

The influence of physical exercise on alterations in concentrations of neuropeptide Y, leptin and other selected hormonal and metabolic parameters in sportspeople

Zajadacz¹,

Skarpańska-Stejnborn²,

Brzenczek-Owczarzak³

et al. 2009

Biol Sport

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“…The higher the intensity and the longer the duration, the greater the response (Lac and Berthon 2000;Port 1991;. The adrenal response is also stronger for intermittent anaerobic versus continuous aerobic exercise (Jensen et al 1991;Vanhelder et al 1985), which is the case in rugby. The psychological constraint associated with the situation of competition reinforces this cortisol response (Filaire et al 1997;Passelergue et al 1995).…”

Section: Discussionmentioning

confidence: 94%

Behaviour of saliva cortisol [C], testosterone [T] and the T/C ratio during a rugby match and during the post-competition recovery days

Elloumi¹,

Maso²,

Michaux³

et al. 2003

Eur J Appl Physiol

117

103

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Competition is a more demanding situation than other strenuous exercise of equivalent duration; it results in stronger physiological changes. The object of this study was to get information on the duration of the recovery period by measuring changes of saliva cortisol [C], testosterone [T] and their ratio T/C in a group of international rugby players ( n=20) during the week following a rugby match (6 days). Using non-invasive saliva assays, we were able to take samples during the day of competition and the post-competitive days. Hormone levels were assayed with a routine in-house radioimmunoassay (RIA) method. Throughout the competition, C levels increased sharply (about 2.5-fold compared resting values) and returned to basal values within 4 h. Conversely, the T level decreased slightly. During the recovery period, C levels were lower and T levels were higher than basal values, resulting in a very high T/C ratio until the 5th day. This high post-competitive T/C ratio phase is probably required to restore the break-down of homeostasis induced by the very hard mental and physical strain associated with a rugby match. Thus, a period of 1 week recovery appears to be the minimal duration between two competitions.

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“…Although overall exercise intensity was similar during the intermittent and continuous exercise, the work-period intensity during intermittent exercise was almost twice the level of the exercise intensity employed during the continuous exercise. The higher (%twofold) treadmill speed used during intermittent exercise would be expected to result in a more rapid glycogenolytic rate in type I skeletal muscle ®bres and a larger recruitment of type II ®bres (Essen 1978;Vollestad and Blom 1985), dierences in circulating catecholamine (Jezova et al 1985), glucagon, growth hormone and cortisol levels (Vanhelder et al 1985) as well as higher levels of muscle glucose uptake (Wahren et al 1971). In turn, these elements are likely to contribute to the contrast in the metabolic response between the two exercise protocols.…”

Section: Discussionmentioning

confidence: 98%

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

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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.

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Hormonal and metabolic response to three types of exercise of equal duration and external work output

Cited by 44 publications

References 20 publications

The influence of physical exercise on alterations in concentrations of neuropeptide Y, leptin and other selected hormonal and metabolic parameters in sportspeople

The influence of physical exercise on alterations in concentrations of neuropeptide Y, leptin and other selected hormonal and metabolic parameters in sportspeople

Behaviour of saliva cortisol [C], testosterone [T] and the T/C ratio during a rugby match and during the post-competition recovery days

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

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