The effect of temperature, gradient, and load carriage on oxygen consumption, posture, and gait characteristics.
Eur J Appl Physiol
; 117(3): 417-430, 2017 Mar.
Article
en En
| MEDLINE
| ID: mdl-28154976
ABSTRACT
PURPOSE:
The purpose of this experiment was to evaluate the effect of load carriage in a range of temperatures to establish the interaction between cold exposure, the magnitude of change from unloaded to loaded walking and gradient.METHODS:
Eleven participants (19-27 years) provided written informed consent before performing six randomly ordered walking trials in six temperatures (20, 10, 5, 0, -5, and -10 °C). Trials involved two unloaded walking bouts before and after loaded walking (18.2 kg) at 4 km · h-1, on 0 and 10% gradients in 4 min bouts.RESULTS:
The change in absolute oxygen consumption (VÌO2) from the first unloaded bout to loaded walking was similar across all six temperatures. When repeating the second unloaded bout, VÌO2 at both -5 and -10 °C was greater compared to the first. At -10 °C, VÌO2 was increased from 1.60 ± 0.30 to 1.89 ± 0.51 L · min-1. Regardless of temperature, gradient had a greater effect on VÌO2 and heart rate (HR) than backpack load. HR was unaffected by temperature. Stride length (SL) decreased with decreasing temperature, but trunk forward lean was greater during cold exposure.CONCLUSION:
Decreased ambient temperature did not influence the magnitude of change in VÌO2 from unloaded to loaded walking. However, in cold temperatures, VÌO2 was significantly higher than in warm conditions. The increased VÌO2 in colder temperatures at the same exercise intensity is predicted to ultimately lead to earlier onset of fatigue and cessation of exercise. These results highlight the need to consider both appropriate clothing and fitness during cold exposure.Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Consumo de Oxígeno
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Postura
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Caminata
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Soporte de Peso
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Respuesta al Choque por Frío
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Marcha
Tipo de estudio:
Prognostic_studies
Límite:
Adult
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Female
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Humans
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Male
Idioma:
En
Año:
2017
Tipo del documento:
Article