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Welcome everyone to our very first podcast.

We are so excited to finally get our first episode out to you all. As a quick introduction to the podcast, our goal is to present and discuss relevant sports science articles.

Designed to give you a “Snippit” of the article we aim to cover topics in about 10-20 minutes. We see that as a good amount of time to get a feel for the article – plus we know how valuable your time is. We really hope you enjoy our first podcast and you come along on our journey.

 

The article we're covering is:Growth Horm IGF Res. 2015 Jun; 25(3):121-6https://www.sciencedirect.com/science/article/pii/S1096637415000234Epub 2015 Apr 12

 

Hormonal and metabolic responses to repeated cycling sprints under different hypoxic conditions

 

Kon M, Nakagaki K, Ebi Y, Nishiyama T, Russell AP

 

Abstract

 

OBJECTIVE:

Sprint exercise and hypoxic stimulus during exercise are potent factors affecting hormonal and metabolic responses. However, the effects of different hypoxic levels on hormonal and metabolic responses during sprint exercise are not known. Here, we examined the effect of different hypoxic conditions on hormonal and metabolic responses during sprint exercise.

 

DESIGN:

Seven male subjects participated in three experimental trials: 1) sprint exercise under normoxia (NSE); 2) sprint exercise under moderate normobaric hypoxia (16.4% oxygen) (HSE 16.4); and 3) sprint exercise under severe normobaric hypoxia (13.6% oxygen) (HSE 13.6). The sprint exercise consisted of four 30s all-out cycling bouts with 4-min rest between bouts. Glucose, free fatty acids (FFA), blood lactate, growth hormone (GH), epinephrine (E), norepinephrine (NE), and insulin concentrations in the HSE trials were measured before exposure to hypoxia (pre 1), 15 min after exposure to hypoxia (pre 2), and at 0, 15, 30, 60, 120, and 180 min after the exercise performed in hypoxia. The blood samples in the NSE trial were obtained in normoxia at the same time points as the HSE trials.

 

RESULTS:

Circulating levels of glucose, FFA, lactate, GH, E, NE, and insulin significantly increased after all three exercise trials (P less than 0.05). The area under the curve (AUC) for GH was significantly higher in the HSE 13.6 trial than in the NSE and HSE 16.4 trials (P less than 0.05). A maximal increase in FFA concentration was observed at 180 min after exercise and was not different between trials.

 

CONCLUSION:

These findings suggest that severe hypoxia may be an important factor for the enhancement of GH response to all-out sprint exercise.

 

Copyright © 2015 Elsevier Ltd. All rights reserved.

 

 

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