GH responses to a near-maximal exercise training session on-the-field in cyclists

C. L. Lafortuna, P. G. Marinone, S. Ottolini, A. Sartorio

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Acute plasma GH response to prolonged (1 h) near-maximal exercise was studied in 7 elite cyclists (6 males, 1 female; mean age±SE: 24.9±1.4 yr) during a routine training session on an uphill track (length: 22.0 km, average slope: 4.39%) and during a recovery (REC) period of 60 min from the end of exercise. The training session entailed a warming-up (WARM) phase of about 20 min at 63% of individual maximal heart rate (HRmax) followed by a high intensity exercise (HIE) phase of about 60 min at 90-92% of HRmax. GH resting values averaged 0.2±0.06 ng/ml; average GH concentration attained a maximal value (21.5±3.3 ng/ml, range: 11.0-38.2 ng/ml) between 20 and 40 min of HIE and significantly decreased thereafter (p=0.01), although exercise intensity was unchanged in the following period (p=0.14). After WARM, GH concentrations were significantly lower than peak values (p=0.05). During REC, GH levels steadily decreased, attaining a value of 2.6±0.8 ng/ml 60 min after the end of exercise. It was concluded that during prolonged and sustained exercise on-the-field in cyclists, GH value determined at the end of the bout may not correspond to the maximal value, which can be observed after 20 to 40 min of near-maximal exercise.

Original languageEnglish
JournalJournal of Endocrinological Investigation
Volume26
Issue number8
Publication statusPublished - Aug 2003

Fingerprint

Heart Rate
Exercise

Keywords

  • Elite cyclists
  • Exercise
  • GH

ASJC Scopus subject areas

  • Endocrinology

Cite this

GH responses to a near-maximal exercise training session on-the-field in cyclists. / Lafortuna, C. L.; Marinone, P. G.; Ottolini, S.; Sartorio, A.

In: Journal of Endocrinological Investigation, Vol. 26, No. 8, 08.2003.

Research output: Contribution to journalArticle

@article{12d641d03e8241e18f7d72bec0a083f2,
title = "GH responses to a near-maximal exercise training session on-the-field in cyclists",
abstract = "Acute plasma GH response to prolonged (1 h) near-maximal exercise was studied in 7 elite cyclists (6 males, 1 female; mean age±SE: 24.9±1.4 yr) during a routine training session on an uphill track (length: 22.0 km, average slope: 4.39{\%}) and during a recovery (REC) period of 60 min from the end of exercise. The training session entailed a warming-up (WARM) phase of about 20 min at 63{\%} of individual maximal heart rate (HRmax) followed by a high intensity exercise (HIE) phase of about 60 min at 90-92{\%} of HRmax. GH resting values averaged 0.2±0.06 ng/ml; average GH concentration attained a maximal value (21.5±3.3 ng/ml, range: 11.0-38.2 ng/ml) between 20 and 40 min of HIE and significantly decreased thereafter (p=0.01), although exercise intensity was unchanged in the following period (p=0.14). After WARM, GH concentrations were significantly lower than peak values (p=0.05). During REC, GH levels steadily decreased, attaining a value of 2.6±0.8 ng/ml 60 min after the end of exercise. It was concluded that during prolonged and sustained exercise on-the-field in cyclists, GH value determined at the end of the bout may not correspond to the maximal value, which can be observed after 20 to 40 min of near-maximal exercise.",
keywords = "Elite cyclists, Exercise, GH",
author = "Lafortuna, {C. L.} and Marinone, {P. G.} and S. Ottolini and A. Sartorio",
year = "2003",
month = "8",
language = "English",
volume = "26",
journal = "Journal of Endocrinological Investigation",
issn = "0391-4097",
publisher = "Springer International Publishing",
number = "8",

}

TY - JOUR

T1 - GH responses to a near-maximal exercise training session on-the-field in cyclists

AU - Lafortuna, C. L.

AU - Marinone, P. G.

AU - Ottolini, S.

AU - Sartorio, A.

PY - 2003/8

Y1 - 2003/8

N2 - Acute plasma GH response to prolonged (1 h) near-maximal exercise was studied in 7 elite cyclists (6 males, 1 female; mean age±SE: 24.9±1.4 yr) during a routine training session on an uphill track (length: 22.0 km, average slope: 4.39%) and during a recovery (REC) period of 60 min from the end of exercise. The training session entailed a warming-up (WARM) phase of about 20 min at 63% of individual maximal heart rate (HRmax) followed by a high intensity exercise (HIE) phase of about 60 min at 90-92% of HRmax. GH resting values averaged 0.2±0.06 ng/ml; average GH concentration attained a maximal value (21.5±3.3 ng/ml, range: 11.0-38.2 ng/ml) between 20 and 40 min of HIE and significantly decreased thereafter (p=0.01), although exercise intensity was unchanged in the following period (p=0.14). After WARM, GH concentrations were significantly lower than peak values (p=0.05). During REC, GH levels steadily decreased, attaining a value of 2.6±0.8 ng/ml 60 min after the end of exercise. It was concluded that during prolonged and sustained exercise on-the-field in cyclists, GH value determined at the end of the bout may not correspond to the maximal value, which can be observed after 20 to 40 min of near-maximal exercise.

AB - Acute plasma GH response to prolonged (1 h) near-maximal exercise was studied in 7 elite cyclists (6 males, 1 female; mean age±SE: 24.9±1.4 yr) during a routine training session on an uphill track (length: 22.0 km, average slope: 4.39%) and during a recovery (REC) period of 60 min from the end of exercise. The training session entailed a warming-up (WARM) phase of about 20 min at 63% of individual maximal heart rate (HRmax) followed by a high intensity exercise (HIE) phase of about 60 min at 90-92% of HRmax. GH resting values averaged 0.2±0.06 ng/ml; average GH concentration attained a maximal value (21.5±3.3 ng/ml, range: 11.0-38.2 ng/ml) between 20 and 40 min of HIE and significantly decreased thereafter (p=0.01), although exercise intensity was unchanged in the following period (p=0.14). After WARM, GH concentrations were significantly lower than peak values (p=0.05). During REC, GH levels steadily decreased, attaining a value of 2.6±0.8 ng/ml 60 min after the end of exercise. It was concluded that during prolonged and sustained exercise on-the-field in cyclists, GH value determined at the end of the bout may not correspond to the maximal value, which can be observed after 20 to 40 min of near-maximal exercise.

KW - Elite cyclists

KW - Exercise

KW - GH

UR - http://www.scopus.com/inward/record.url?scp=17444437102&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=17444437102&partnerID=8YFLogxK

M3 - Article

VL - 26

JO - Journal of Endocrinological Investigation

JF - Journal of Endocrinological Investigation

SN - 0391-4097

IS - 8

ER -