Influence of two pedalling rate conditions on mechanical output and physiological responses during all-out intermittent exercise

2003 ◽  
Vol 89 (2) ◽  
pp. 157-165 ◽  
Author(s):  
Sylvain Dorel ◽  
Muriel Bourdin ◽  
Emmanuel Van Praagh ◽  
Jean-René Lacour ◽  
Christophe André Hautier
Keyword(s):  
Intermittent Exercise ◽  
Physiological Responses ◽  
Pedalling Rate

Physiological responses to cold stress during prolonged intermittent low- and high-intensity walking

1997 ◽  
Vol 272 (6) ◽  
pp. R2025-R2033 ◽  
Author(s):  
A. S. Weller ◽  
C. E. Millard ◽  
M. A. Stroud ◽  
P. L. Greenhaff ◽  
I. A. Macdonald
Keyword(s):  
Rectal Temperature ◽  
Intermittent Exercise ◽  
Physiological Responses ◽  
Plasma Norepinephrine ◽  
O2 Consumption ◽  
Exercise Protocol ◽  
Marked Influence ◽  
Low Intensity ◽  
Grade 5 ◽  
Walking Exercise

In a previous study [Am. J. Physiol. 272 (Regulatory Integrative Comp. Physiol. 41): R226-R233, 1997], the physiological responses to 240 min of intermittent low-intensity walking exercise in a cold (+5 degrees C), wet, and windy environment (Cold) may have been influenced by a 120-min preceding phase of intermittent higher-intensity exercise. Furthermore, the physiological responses observed during this latter phase may have been different if it had been more prolonged. To address these questions, active men attempted a 360-min intermittent (15 min of rest, 45 min of exercise) exercise protocol in Cold and a thermoneutral environment (+15 degrees C, Neutral) at a low (0% grade, 5 km/h; Low; n = 14) and a higher (10% grade, 6 km/h; High; n = 10) intensity. During Low, rectal temperature was lower in Cold than in Neutral, whereas O2 consumption, carbohydrate oxidation, plasma norepinephrine and epinephrine, and blood lactate were higher. During High, Cold had a similar but less marked influence on the thermoregulatory responses to exercise than during Low. In conclusion, the physiological responses to Low are similarly influenced by Cold whether or not they are preceded by High. Furthermore, during intermittent exercise up to an intensity of approximately 60% of peak O2 consumption, a cold, wet, and windy environment will influence the physiological responses to exercise and potentially impair performance.

Differentiated Perceptions of Exertion: Part II. Relationship to Local and Central Physiological Responses

1979 ◽  
Vol 49 (3) ◽  
pp. 691-697 ◽  
Author(s):  
Robert J. Robertson ◽  
Robert L. Gillespie ◽  
Jean McCarthy ◽  
Kenneth D. Rose
Keyword(s):  
Lactic Acid ◽  
Perceived Exertion ◽  
Physiological Responses ◽  
Cycle Ergometer ◽  
Ratings Of Perceived Exertion ◽  
Pedalling Rate ◽  
Ergometer Exercise ◽  
Physiological Adjustments ◽  
Male Subjects ◽  
Maximal Cycle

Differentiated ratings of perceived exertion in the legs and chest were compared to local and central physiological adjustments during sub-maximal cycle ergometer exercise. 50 male subjects performed three separate cycle ergometer tests. Power output was held constant at 840 kpm/min., while pedalling rate was randomly set at 40, 60, or 80 rpm. Differentiated reports of exertion from the legs were considered to be local signals and reports from the chest to be central signals. Ratings of exertion for the legs, chest and over-all body were each significantly higher at 40 rpm than 60 or 80 rpm. Heart rate, oxygen uptake, ventilation and respiratory rate were also higher at 40 rpm. Lactic acid, pH, and pCOs were similar between pedalling rates. Lactic acid did not operate differentially to influence local perceptual signals from the legs. Central measures of respiratory and aerobic metabolic adjustments were consistent with the more intense regional report of chest exertion at 40 rpm.

High-Intensity Intermittent Exercise: Methodological and Physiological Aspects

2013 ◽  
Vol 8 (6) ◽  
pp. 600-610 ◽  
Author(s):  
Gerhard Tschakert ◽  
Peter Hofmann
Keyword(s):  
High Intensity ◽  
Intermittent Exercise ◽  
Physiological Responses ◽  
Maximal Heart Rate ◽  
Lactate Metabolism ◽  
Physiological Mechanisms ◽  
Beneficial Effects ◽  
Training Adaptations

High-intensity intermittent exercise (HIIE) has been applied in competitive sports for more than 100 years. In the last decades, interval studies revealed a multitude of beneficial effects in various subjects despite a large variety of exercise prescriptions. Therefore, one could assume that an accurate prescription of HIIE is not relevant. However, the manipulation of HIIE variables (peak workload and peak-workload duration, mean workload, intensity and duration of recovery, number of intervals) directly affects the acute physiological responses during exercise leading to specific medium- and long-term training adaptations. The diversity of intermittent-exercise regimens applied in different studies may suggest that the acute physiological mechanisms during HIIE forced by particular exercise prescriptions are not clear in detail or not taken into consideration. A standardized and consistent approach to the prescription and classification of HIIE is still missing. An optimal and individual setting of the HIIE variables requires the consideration of the physiological responses elicited by the HIIE regimen. In this regard, particularly the intensities and durations of the peak-workload phases are highly relevant since these variables are primarily responsible for the metabolic processes during HIIE in the working muscle (eg, lactate metabolism). In addition, the way of prescribing exercise intensity also markedly influences acute metabolic and cardiorespiratory responses. Turn-point or threshold models are suggested to be more appropriate and accurate to prescribe HIIE intensity than using percentages of maximal heart rate or maximal oxygen uptake.

The influence of pre-warming on the physiological responses to prolonged intermittent exercise

2005 ◽  
Vol 23 (5) ◽  
pp. 455-464 ◽  
Author(s):  
WA Gregson ◽  
A Batterham ◽  
B Drust ◽  
NT Cable
Keyword(s):  
Intermittent Exercise ◽  
Physiological Responses
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