Document Detail


Effects of exercise training on thermoregulatory responses and blood volume in older men.
MedLine Citation:
PMID:  12381747     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We assessed the effects of aerobic and/or resistance training on thermoregulatory responses in older men and analyzed the results in relation to the changes in peak oxygen consumption rate (VO(2 peak)) and blood volume (BV). Twenty-three older men [age, 64 +/- 1 (SE) yr; VO(2 peak), 32.7 +/- 1.1 ml. kg(-1). min(-1)] were divided into three training regimens for 18 wk: control (C; n = 7), aerobic training (AT; n = 8), and resistance training (RT; n = 8). Subjects in C were allowed to perform walking of ~10,000 steps/day, 6-7 days/wk. Subjects in AT exercised on a cycle ergometer at 50-80% VO(2 peak) for 60 min/day, 3 days/wk, in addition to the walking. Subjects in RT performed a resistance exercise, including knee extension and flexion at 60-80% of one repetition maximum, two to three sets of eight repetitions per day, 3 days/wk, in addition to the walking. After 18 wk of training, VO(2 peak) increased by 5.2 +/- 3.4% in C (P > 0.07), 20.0 +/- 2.5% in AT (P < 0.0001), and 9.7 +/- 5.1% in RT (P < 0.003), but BV remained unchanged in all trials. In addition, the esophageal temperature (T(es)) thresholds for forearm skin vasodilation and sweating, determined during 30-min exercise of 60% VO(2 peak) at 30 degrees C, decreased in AT (P < 0.02) and RT (P < 0.02) but not in C (P > 0.2). In contrast, the slopes of forearm skin vascular conductance/T(es) and sweat rate/T(es) remained unchanged in all trials, but both increased in subjects with increased BV irrespective of trials with significant correlations between the changes in the slopes and BV (P < 0.005 and P < 0.0005, respectively). Thus aerobic and/or resistance training in older men increased VO(2 peak) and lowered T(es) thresholds for forearm skin vasodilation and sweating but did not increase BV. Furthermore, the sensitivity of the increase in skin vasodilation and sweating at a given increase in T(es) was more associated with BV than with VO(2 peak).
Authors:
Kazunobu Okazaki; Yoshi-Ichiro Kamijo; Yoshiaki Takeno; Tadashi Okumoto; Shizue Masuki; Hiroshi Nose
Related Documents :
12672977 - Approximation equation for oxygen uptake kinetics in decrement-load exercise starting f...
10541927 - Diurnal variations in ventilatory and cardiorespiratory responses to submaximal treadmi...
18354247 - Association between arterial elasticity, c-reactive protein and maximal oxygen consumpt...
11839527 - Invited review: pulmonary alveoli: formation, the "call for oxygen," and other regulators.
16293267 - Survival under chronic stress from sediment load: spatial patterns of hard coral commun...
1506937 - Heart rate response of firefighters to actual emergencies. implications for cardiorespi...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  93     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-10-16     Completed Date:  2003-04-10     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1630-7     Citation Subset:  IM; S    
Affiliation:
Department of Sports Medicine, Research Center on Aging and Adaptation, Shinshu University School of Medicine, Matsumoto 390-8621, Japan.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Aged
Aging / physiology*
Blood Volume / physiology*
Body Temperature
Body Temperature Regulation / physiology*
Differential Threshold
Esophagus / physiology
Exercise / physiology
Forearm
Humans
Male
Middle Aged
Oxygen Consumption / physiology
Physical Education and Training*
Regional Blood Flow / physiology
Skin / blood supply
Sweating / physiology
Weight Lifting / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Mucosal afferents mediate laryngeal adductor responses in the cat.
Next Document:  Epinephrine inhibits insulin-stimulated muscle glucose transport.