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Int J Sports Med 2017; 38(07): 515-520
DOI: 10.1055/s-0043-101913
Training & Testing
© Georg Thieme Verlag KG Stuttgart · New York

Locomotion Mode Affects the Physiological Strain during Exercise at Walk-Run Transition Speed inElderly Men

Raul Freire
1   Physical Activity Sciences Graduate Program, Salgado de Oliveira University, Rio de Janeiro, Brazil
2   Laboratory of Physical Activity and Health Promotion, Rio de Janeiro State University, Rio de Janeiro, Brazil
,
Paulo Farinatti
1   Physical Activity Sciences Graduate Program, Salgado de Oliveira University, Rio de Janeiro, Brazil
2   Laboratory of Physical Activity and Health Promotion, Rio de Janeiro State University, Rio de Janeiro, Brazil
,
Felipe Cunha
2   Laboratory of Physical Activity and Health Promotion, Rio de Janeiro State University, Rio de Janeiro, Brazil
3   Rehabilitation Sciences Graduate Program, Augusto Mota University Center, Rio de Janeiro, Brazil
,
Brenno Silva
1   Physical Activity Sciences Graduate Program, Salgado de Oliveira University, Rio de Janeiro, Brazil
,
Walace Monteiro
1   Physical Activity Sciences Graduate Program, Salgado de Oliveira University, Rio de Janeiro, Brazil
2   Laboratory of Physical Activity and Health Promotion, Rio de Janeiro State University, Rio de Janeiro, Brazil
› Author Affiliations
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Publication History



accepted after revision 02 January 2017

Publication Date:
31 May 2017 (online)

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Abstract

This study investigated cardiorespiratory responses and rating of perceived exertion (RPE) during prolonged walking and running exercise performed at the walk-run transition speed (WRTS) in untrained healthy elderly men. 20 volunteers (mean±SE, age: 68.4±1.2 yrs; height: 170.0±0.02 cm; body mass: 74.7±2.3 kg) performed the following bouts of exercise: a) maximal cardiopulmonary exercise test (CPET); b) specific protocol to detect WRTS; and c) two 30-min walking and running bouts at WRTS. Expired gases were collected during exercise bouts via the Ultima CardiO2 metabolic analyzer. Compared to walking, running at the WRTS resulted in higher oxygen uptake (>0.27 L·min−1), pulmonary ventilation (>7.7 L·min−1), carbon dioxide output (>0.23 L·min−1), heart rate (>15 beats·min−1), oxygen pulse (>0.88 15 mL·beats−1), energy expenditure (>27 kcal) and cost of oxygen transport (>43 mL·kg−1·km−1·bout−1). The increase of overall and local RPEs with exercise duration was similar across locomotion modes (P<0.001). In all participants, %HRR and %VO2R throughout walking and running bouts were around or above the gas exchange threshold. In conclusion, elderly men exhibited higher cardiorespiratory responses during 30-min bouts of running than walking at WRTS. Nevertheless, walking corresponded to relative metabolic intensities compatible with preservation or improvement of cardiorespiratory fitness and should be preferable over running at WRTS in the untrained elderly characterized by poor fitness and reduced exercise tolerance.

Key words

walk-run transition speed - oxygen uptake reserve - heart rate reserve - perceived exertion - gas exchange threshold - exercise prescription
 

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