scholarly journals Single-dose prednisolone alters endocrine and haematologic responses and exercise performance in men

2019 ◽  
Vol 8 (2) ◽  
pp. 111-119 ◽  
Author(s):  
Alexander Tacey ◽  
Lewan Parker ◽  
Bu B Yeap ◽  
John Joseph ◽  
Ee M Lim ◽  
...  
Keyword(s):  
Heart Rate ◽  
Single Dose ◽  
Blood Glucose ◽  
Exercise Performance ◽  
High Intensity ◽  
Cycling Performance ◽  
Total Work ◽  
Post Exercise ◽  
High Intensity Interval ◽  
Interval Cycling

The aim of this study was to investigate the effect of a single dose of prednisolone on (A) high-intensity interval cycling performance and (B) post-exercise metabolic, hormonal and haematological responses. Nine young men participated in this double-blind, randomised, cross-over study. The participants completed exercise sessions (4 × 4 min cycling bouts at 90–95% of peak heart rate), 12 h after ingesting prednisolone (20 mg) or placebo. Work load was adjusted to maintain the same relative heart rate between the sessions. Exercise performance was measured as total work performed. Blood samples were taken at rest, immediately post exercise and up to 3 h post exercise. Prednisolone ingestion decreased total work performed by 5% (P < 0.05). Baseline blood glucose was elevated following prednisolone compared to placebo (P < 0.001). Three hours post exercise, blood glucose in the prednisolone trial was reduced to a level equivalent to the baseline concentration in the placebo trial (P > 0.05). Prednisolone suppressed the increase in blood lactate immediately post exercise (P < 0.05). Total white blood cell count was elevated at all time-points with prednisolone (P < 0.01). Androgens and sex hormone-binding globulin were elevated immediately after exercise, irrespective of prednisolone or placebo. In contrast, prednisolone significantly reduced the ratio of testosterone/luteinizing hormone (P < 0.01). Acute prednisolone treatment impairs high-intensity interval cycling performance and alters metabolic and haematological parameters in healthy young men. Exercise may be an effective tool to minimise the effect of prednisolone on blood glucose levels.

scholarly journals Post-exercise cold water immersion does not alter high intensity interval training-induced exercise performance and Hsp72 responses, but enhances mitochondrial markers

2016 ◽  
Vol 21 (5) ◽  
pp. 793-804 ◽  
Author(s):  
Paula Fernandes Aguiar ◽  
Sílvia Mourão Magalhães ◽  
Ivana Alice Teixeira Fonseca ◽  
Vanessa Batista da Costa Santos ◽  
Mariana Aguiar de Matos ◽  
...  
Keyword(s):  
Exercise Performance ◽  
High Intensity ◽  
Cold Water ◽  
Water Immersion ◽  
Interval Training ◽  
Cold Water Immersion ◽  
High Intensity Interval Training ◽  
Post Exercise ◽  
Mitochondrial Markers ◽  
High Intensity Interval

scholarly journals Effects of high-intensity interval versus continuous exercise training on post-exercise heart rate recovery in coronary heart-disease patients

2017 ◽  
Vol 244 ◽  
pp. 17-23 ◽  
Author(s):  
Koldobika Villelabeitia-Jaureguizar ◽  
Davinia Vicente-Campos ◽  
Alejandro Berenguel Senen ◽  
Verónica Hernández Jiménez ◽  
María Elvira Barrios Garrido-Lestache ◽  
...  
Keyword(s):  
Heart Rate ◽  
Coronary Heart Disease ◽  
Heart Disease ◽  
Exercise Training ◽  
High Intensity ◽  
Heart Rate Recovery ◽  
Exercise Heart Rate ◽  
Post Exercise ◽  
Continuous Exercise ◽  
High Intensity Interval

RPE Association with Lactate and Heart Rate during High-Intensity Interval Cycling

2006 ◽  
Vol 38 (1) ◽  
pp. 167-172 ◽  
Author(s):  
JAMES M. GREEN ◽  
JOHN R. MCLESTER ◽  
THAD R. CREWS ◽  
PHILLIP J. WICKWIRE ◽  
ROBERT C. PRITCHETT ◽  
...  
Keyword(s):  
Heart Rate ◽  
High Intensity ◽  
High Intensity Interval ◽  
Interval Cycling

scholarly journals Acute Effects of High-Intensity Interval and Moderate-Intensity Continuous Exercise on GLP-1, Appetite and Energy Intake in Obese Men: A Crossover Trial

Nutrients ◽  
2018 ◽  
Vol 10 (7) ◽  
pp. 889 ◽  
Author(s):  
Victor Matos ◽  
Daniel Souza ◽  
Victor Santos ◽  
Ítalo Medeiros ◽  
Rodrigo Browne ◽  
...  
Keyword(s):  
Heart Rate ◽  
Energy Intake ◽  
High Intensity ◽  
Crossover Trial ◽  
Moderate Intensity ◽  
Maximal Heart Rate ◽  
Post Exercise ◽  
Continuous Exercise ◽  
Glucagon Like Peptide 1 ◽  
High Intensity Interval

This study investigated the effect of high-intensity interval (HIIE) and moderate-intensity continuous exercise (MICE) on glucagon-like peptide 1 (GLP-1), appetite and energy intake (EI) in obese men. In a randomized crossover trial, 12 participants (28.4 ± 2.6 years, 35.5 ± 4.5 kg/m2, 39.8 ± 2.2% body fat) performed: (I) Control (CON, no exercise); (II) MICE (20 min, 70% of maximal heart rate) and (III) HIIE (10 × 1 min at 90% of maximal heart rate with 1 min recovery). GLP-1 and appetite were assessed at: (I) PRE: pre-exercise; (II) POST: immediately post-exercise; (III) POST-1 h: 1 h post-exercise. EI was assessed after an ad libitum meal offered 1 h post-exercise and over 24 h. There was a significant time × condition interaction for GLP-1 (p = 0.035). Higher GLP-1 levels in MICE vs. CON (p = 0.024) and a trend for HIIE vs. CON (p = 0.069) POST-1h was found. Hunger was reduced immediately post-HIIE compared to CON (p < 0.01), but was not sustained POST-1 h (p > 0.05). EI did not differ between the sessions 1 h post-exercise or over 24H (p > 0.05). In summary, although MICE increased GLP-1 levels POST-1h and HIIE induced a transient reduction in hunger, both exercise protocols did not impact EI in obese men.

An Investigation into the Effects of Sodium Citrate Ingestion on High-Intensity Exercise Performance

1998 ◽  
Vol 8 (4) ◽  
pp. 356-363 ◽  
Author(s):  
Ken van Someren ◽  
Kathy Fulcher ◽  
John McCarthy ◽  
Jonathan Moore ◽  
Gill Horgan ◽  
...  
Keyword(s):  
Blood Lactate ◽  
Exercise Performance ◽  
High Intensity ◽  
Peak Power ◽  
Sodium Citrate ◽  
Intermittent Exercise ◽  
Cycling Performance ◽  
Total Work ◽  
Citrate Solution ◽  
Blood Ph

This study examined the effect of sodium citrate ingestion on high-intensity cycling performance in repeated 45-s bouts. Twelve subjects (9 male and 3 female) ingested either a sodium citrate solution (0.3 g ⋅ kg−1 body mass [BM]) or a placebo 90 min prior to exercise. Postingestion blood HCO3 concentrations were significantly higher in the citrate trial (p < .01), but there was no difference in blood pH between trials. Peak power and total work significantly decreased over the five bouts (p < .05) and postexercise blood lactate concentrations significantly increased over the five bouts (p < 0.01), but there were no differences between trials. We conclude that sodium citrate ingestion (0.3 g ⋅ kg−1 BM) is not an effective ergogenic aid for high-intensity, intermittent exercise as simulated in this protocol.

scholarly journals Acute Fetal Response to High-Intensity Interval Training in the Second and Third Trimesters of Pregnancy

2021 ◽  
Author(s):  
Julie Anderson ◽  
Jessica Pudwell ◽  
Colin McAuslan ◽  
Logan Barr ◽  
Jessica Kehoe ◽  
...  
Keyword(s):  
Heart Rate ◽  
Pregnant Women ◽  
High Intensity ◽  
Umbilical Artery ◽  
Interval Training ◽  
High Intensity Interval Training ◽  
Post Exercise ◽  
Exercise Modality ◽  
High Intensity Interval ◽  
Fetal Response

The majority of women do not meet the recommended levels of exercise during their pregnancies, frequently due to a lack of time. High-intensity interval training offers a potential solution, providing an effective, time-efficient exercise modality. This exercise modality has not been studied in pregnancy therefore, the objective of this study was to evaluate fetal response to a high-intensity interval training resistance circuit in the late second and early third trimesters of pregnancy. Fourteen active, healthy women with uncomplicated, singleton pregnancies participated in a high-intensity interval training resistance circuit between 28+0/7 and 32+0/7 weeks. A Borg rating of perceived exertion of 15-17/20 and an estimated heart rate of 80-90% of maternal heart-rate maximum was targeted. Fetal well-being was evaluated continuously with fetal heart-rate tracings and umbilical artery Doppler velocimetry conducted pre-and post-exercise. Fetal heart rate tracings were normal throughout the exercise circuit. Post-exercise, umbilical artery end-diastolic flow was normal and significant decreases were observed in the mean systolic/diastolic ratios, pulsatility indexes and resistance indexes. Therefore, in a small cohort of active pregnant women, a high-intensity interval training resistance circuit in the late second and early third trimesters of pregnancy appears to be a safe exercise modality with no acute, adverse fetal effects but further study is required. Novelty: • High-Intensity Interval Training, at an intensity in excess of current recommendations, does not appear to be associated with any adverse fetal effects in previously active pregnant women. • High-Intensity Interval Training is an enjoyable and effective exercise modality in previously active pregnant women.

Comparing the Effects of Immersed Versus Land-Based High-Intensity Interval Cycling on Energy Intake, Appetite Sensations and Perceived Exertion Among Healthy Men

2021 ◽  
pp. 003151252110073
Author(s):  
Lore Metz ◽  
Laurie Isacco ◽  
Maud Miguet ◽  
Pauline Genin ◽  
David Thivel ◽  
...  
Keyword(s):  
Energy Intake ◽  
High Intensity ◽  
Perceived Exertion ◽  
Area Under The Curve ◽  
Macronutrient Intake ◽  
Healthy Men ◽  
High Intensity Interval ◽  
Interval Cycling ◽  
Desire To Eat ◽  
The Relationship

Immersed exercise has been shown to induce higher energy expenditure and no difference or increase in food intake compared with similar exercise on land. In this study, we compared the effects of acute high-intensity cycling performed on land versus when immersed on subsequent energy intake (EI), appetite sensations and perceived exertion (RPE) in healthy men. Ten participants in a postprandial condition completed three experimental visits in a randomized order: a control condition (CONT); a high-intensity interval cycling exercise performed on land (HIIE-L) and the same exercise while immersed in water (HIIE-A) with a similar targeted heart rate. We observed no difference in energy and macronutrient intake and in area under the curve (AUC) for appetite sensations between sessions. The RPE at the end of HIIE-L was negatively correlated with EI (r=–0.67; p < 0.05), AUC for hunger (r=–0.86, p < 0.01), desire to eat (r=–0.78, p < 0.05) and prospective food consumption (r=–0.86, p < 0.01). Conversely, the RPE at the end of HIIE-L was positively correlated with AUC for fullness (r = 0.76 , p < 0.05). No such correlations were observed for HIIE-A. The present study was the first to observe that immersion did not influence EI after HIIE cycling, but immersion blunted the relationship between session RPE and subsequent energy intake and appetite sensations relative to HIIE on land.

scholarly journals The Effects of High-Intensity Interval Training vs. Moderate-Intensity Continuous Training on Heart Rate Variability in Physically Inactive Adults

2018 ◽  
Vol 15 (7) ◽  
pp. 1508 ◽  
Author(s):  
Abdullah Alansare ◽  
Ken Alford ◽  
Sukho Lee ◽  
Tommie Church ◽  
Hyun Jung
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
High Intensity ◽  
Interval Training ◽  
Moderate Intensity ◽  
High Intensity Interval Training ◽  
Continuous Training ◽  
Significant Interaction Effect ◽  
High Intensity Interval ◽  
Physically Inactive

Physically inactive adults are prevalent worldwide. This study compared the effects of short-term high-intensity interval training (HIIT) versus moderate-intensity continuous training (MICT) on heart rate variability (HRV) in physically inactive adults as a preliminary study. Thirteen physically inactive male adults (27.5 ± 3.80 years) were randomly assigned to HIIT (N = 7) or MICT (N = 6). The HIIT program consisted of 20 min of interval training with cycling to rest ratio of 10/50 s at ≥90% HRpeak, while the MICT program consisted of 40 min of continuous cycling at 60–75% HRpeak. Both groups completed eight sessions of training within two weeks. Time and frequency domains of HRV were measured for 20 min with Actiwave-Cardio monitor (CamNtech, UK). The number of R-R interval and inter-beat interval (IBI) were significantly improved (p < 0.05) in both HIIT and MICT programs following eight sessions of training. A significant interaction effect for group by time was found in the lnLF/HF ratio (p < 0.05) where it was only improved in the HIIT group from pre- to post-test. The HIIT program is superior to MICT in improving HRV in physically inactive adults. The HIIT program can be applied as a time-efficient program for improving cardiac-autoregulation.

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