Glycogen depletion in intrafusal fibres in rats during short-duration high-intensity treadmill running

2005 ◽  
Vol 185 (1) ◽  
pp. 41-50 ◽  
Author(s):  
A. Yoshimura ◽  
Y. Toyoda ◽  
T. Murakami ◽  
H. Yoshizato ◽  
Y. Ando ◽  
...  
Keyword(s):  
Short Duration ◽  
High Intensity ◽  
Treadmill Running ◽  
Glycogen Depletion ◽  
Intrafusal Fibres

Higher mitochondrial fatty acid oxidation following intermittent versus continuous endurance exercise training

1998 ◽  
Vol 76 (9) ◽  
pp. 891-894 ◽  
Author(s):  
P D Chilibeck ◽  
G J Bell ◽  
R P Farrar ◽  
T P Martin
Keyword(s):  
Fatty Acid ◽  
Exercise Training ◽  
Fatty Acid Oxidation ◽  
Endurance Exercise ◽  
High Intensity ◽  
Treadmill Running ◽  
Acid Oxidation ◽  
Interval Exercise ◽  
Endurance Exercise Training ◽  
Mitochondrial Fatty Acid

It has been well documented that skeletal muscle fatty acid oxidation can be elevated by continuous endurance exercise training. However, it remains questionable whether similar adaptations can be induced with intermittent interval exercise training. This study was undertaken to directly compare the rates of fatty acid oxidation in isolated subsarcolemmal (SS) and intermyofibrillar (IMF) mitochondria following these different exercise training regimes. Mitochondria were isolated from the gastrocnemius-plantaris muscles of male Sprague-Dawley rats following exercise training 6 days per week for 12 weeks. Exercise training consisted of either continuous, submaximal, endurance treadmill running (n = 10) or intermittent, high intensity, interval running (n = 10). Both modes of training enhanced the oxidation of palmityl-carnitine-malate in both mitochondrial populations (p < 0.05). However, the increase associated with the intermittent, high intensity exercise training was significantly greater than that achieved with the continuous exercise training (p < 0.05). Also, the increases associated with the IMF mitochondria were greater than the SS mitochondria (p < 0.05). These data suggest that high intensity, intermittent interval exercise training is more effective for stimulation of fatty acid oxidation than continuous submaximal exercise training and that this adaptation occurs preferentially within IMF mitochondria.Key words: muscle, subsarcolemmal mitochondria, intermyofibrillar mitochondria.

The Effect of Short-duration, High-intensity Electromagnetic Pulses on Fresh Ulnar Fractures in Rats

2002 ◽  
Vol 49 (1) ◽  
pp. 33-37 ◽  
Author(s):  
S. LEISNER ◽  
R. SHAHAR ◽  
I. AIZENBERG ◽  
D. LICHOVSKY ◽  
T. LEVIN-HARRUS
Keyword(s):  
Short Duration ◽  
High Intensity ◽  
Electromagnetic Pulses

Consumption of açai (Euterpe oleraceaMart.) functional beverage reduces muscle stress and improves effort tolerance in elite athletes: a randomized controlled intervention study

2015 ◽  
Vol 40 (7) ◽  
pp. 725-733 ◽  
Author(s):  
Jacqueline Carvalho-Peixoto ◽  
Mirian Ribeiro Leite Moura ◽  
Felipe Amorim Cunha ◽  
Pablo Christiano B. Lollo ◽  
Walace David Monteiro ◽  
...  
Keyword(s):  
High Intensity ◽  
Perceived Exertion ◽  
Maximal Exercise ◽  
Metabolic Stress ◽  
Ergogenic Aid ◽  
Treadmill Running ◽  
Time To Exhaustion ◽  
Euterpe Oleracea ◽  
Exercise Tests ◽  
Cardiorespiratory Responses

The study analyzed the effect of an açai (Euterpe oleracea Mart.) functional beverage (AB) on muscle and oxidative stress markers, cardiorespiratory responses, perceived exertion, and time-to-exhaustion during maximal treadmill running. The beverage was developed as an ergogenic aid for athletes and contained 27.6 mg of anthocyanins per dose. Fourteen athletes performed 3 exercise tests: a ramp-incremental maximal exercise test and 2 maximal exercise bouts performed in 2 conditions (AB and without AB (control)) at 90% maximal oxygen uptake.Blood was collected at baseline and after maximal exercise in both conditions to determine biomarkers. AB increased time to exhaustion during short-term high-intensity exercise (mean difference: 69 s, 95% confidence interval = –296 s to 159 s, t = 2.2, p = 0.045), attenuating the metabolic stress induced by exercise (p < 0.05). AB also reduced perceived exertion and enhanced cardiorespiratory responses (p < 0.05). The AB may be a useful and practical ergogenic aid to enhance performance during high-intensity training.

scholarly journals High Intensity Exercise and Glycogen Depletion

2016 ◽  
Vol 5 (3) ◽  
Author(s):  
Julien S Baker ◽  
Duncan Buchan ◽  
Mike Graham
Keyword(s):  
High Intensity ◽  
High Intensity Exercise ◽  
Glycogen Depletion

Comparison of different volumes of high intensity interval training on cardiac autonomic function in sedentary young women

2017 ◽  
Vol 31 (6) ◽  
Author(s):  
Pooja Bhati ◽  
Vishal Bansal ◽  
Jamal Ali Moiz
Keyword(s):  
Heart Rate ◽  
Body Composition ◽  
Muscle Strength ◽  
Young Women ◽  
High Intensity ◽  
High Frequency ◽  
Interval Training ◽  
Treadmill Running ◽  
High Intensity Interval Training ◽  
High Intensity Interval

Abstract Purpose The present study was conducted to compare the effects of low volume of high intensity interval training (LVHIIT) and high volume of high intensity interval training (HVHIIT) on heart rate variability (HRV) as a primary outcome measure, and on maximum oxygen consumption (VO2max), body composition, and lower limb muscle strength as secondary outcome measures, in sedentary young women. Methods Thirty-six participants were recruited in this study. The LVHIIT group (n = 17) performed one 4-min bout of treadmill running at 85%–95% maximum heart rate (HRmax), followed by 3 min of recovery by running at 70% HRmax, three times per week for 6 weeks. The HVHIIT group (n = 15) performed four times 4-min bouts of treadmill running at 85%–95% HRmax, interspersed with 3-min of recovery by running at 70% HRmax, 3 times per week for 6 weeks. All criterion measures were measured before and after training in both the groups. Results Due to attrition of four cases, data of 32 participants was used for analysis. A significant increase in high frequency (HF) power (p < 0.001) and decrease in the ratio of low frequency to high frequency power (LF/HF) ratio (p < 0.001) in HRV parameters, was observed post-HVHIIT, whereas, these variables did not change significantly (HF: p = 0.92, LF/HF ratio: p = 0.52) in LVHIIT group. Nevertheless, both the interventions proved equally effective in improving aerobic capacity (VO2max), body composition, and muscle strength. Conclusion The study results suggest that both LVHIIT and HVHIIT are equally effective in improving VO2max, body composition, and muscle strength, in sedentary young women. However, HVHIIT induces parasympathetic dominance as well, as measured by HRV.

Rating Perceived Exertion during Short Duration, Very High Intensity Cycle Exercise

2005 ◽  
Vol 100 (3) ◽  
pp. 767-773 ◽  
Author(s):  
Randall F. Gearhart ◽  
M. Daniel Becque ◽  
Chad M. Palm ◽  
Matthew D. Hutchins
Keyword(s):  
Resistance Exercise ◽  
Short Duration ◽  
High Resistance ◽  
High Intensity ◽  
Repeated Measures ◽  
Perceived Exertion ◽  
Cycle Exercise ◽  
Low Resistance ◽  
Resistance Exercises ◽  
Very High

This study compared undifferentiated ratings of perceived exertion (RPE) during short duration, very high intensity cycle exercise using high and low resistance. 30 recreationally trained males (24.2 ± 2.4 yr.) were memory-anchored to the Borg 15-category scale. The high and low resistance exercises were defined by 30-sec. maximum tests assigned in counterbalanced order, with resistances set before testing during an orientation session. High resistance was 10% of body mass. Low resistance resulted in the same total work as the high resistance over the 30-sec. sessions (± 5%) but increased pedal rate. RPE was taken at 8, 13, 18, 23, and 28 sec. during the high and the low resistance exercises. Measurements were compared using a 2-way repeated-measures analysis of variance. RPE was significantly greater ( p = .005) for the high than the low resistance exercise at each interval. RPE increased when the subjects were required to pedal against a greater resistance and produce the highest forces. These RPE data are consistent with data from both aerobic cycle and resistance exercise. The data suggest that instantaneous force production, not summed work, is a primary determinant of RPE. All of these observations support Cafarelli's theoretical model of effort sense. In conclusion, as an individual generates more force during high resistance exercise than in light resistance exercise, a potential explanation of our results is that the increased motor outflow and corollary sensory signal lead to a greater sense of effort.

scholarly journals Acute administration of high doses of taurine does not substantially improve high-intensity running performance and the effect on maximal accumulated oxygen deficit is unclear

2016 ◽  
Vol 41 (5) ◽  
pp. 498-503 ◽  
Author(s):  
Fabio Milioni ◽  
Elvis de Souza Malta ◽  
Leandro George Spinola do Amaral Rocha ◽  
Camila Angélica Asahi Mesquita ◽  
Ellen Cristini de Freitas ◽  
...  
Keyword(s):  
Oxygen Uptake ◽  
Exercise Intensity ◽  
Maximal Oxygen Uptake ◽  
High Intensity ◽  
Treadmill Running ◽  
Oxygen Deficit ◽  
Time To Exhaustion ◽  
Acute Administration ◽  
Running Performance ◽  
Accumulated Oxygen Deficit

The aim of the present study was to investigate the effects of acute administration of taurine overload on time to exhaustion (TTE) of high-intensity running performance and alternative maximal accumulated oxygen deficit (MAODALT). The study design was a randomized, placebo-controlled, crossover design. Seventeen healthy male volunteers (age: 25 ± 6 years; maximal oxygen uptake: 50.5 ± 7.6 mL·kg−1·min−1) performed an incremental treadmill-running test until voluntary exhaustion to determine maximal oxygen uptake and exercise intensity at maximal oxygen uptake. Subsequently, participants completed randomly 2 bouts of supramaximal treadmill-running at 110% exercise intensity at maximal oxygen uptake until exhaustion (placebo (6 g dextrose) or taurine (6 g) supplementation), separated by 1 week. MAODALT was determined using a single supramaximal effort by summating the contribution of the phosphagen and glycolytic pathways. When comparing the results of the supramaximal trials (i.e., placebo and taurine conditions) no differences were observed for high-intensity running TTE (237.70 ± 66.00 and 277.30 ± 40.64 s; p = 0.44) and MAODALT (55.77 ± 8.22 and 55.06 ± 7.89 mL·kg−1; p = 0.61), which seem to indicate trivial and unclear differences using the magnitude-based inferences approach, respectively. In conclusion, acute 6 g taurine supplementation before exercise did not substantially improve high-intensity running performance and showed an unclear effect on MAODALT.

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