Limitations of oxygen uptake and leg muscle activity during ascending evacuation in stairways
Halder, Amitava LU
; Kuklane, Kalev
LU
; Gao, Chuansi
LU
; Miller, Michael
LU
; Delin, Mattias
LU
; Norén, Johan
LU
and Fridolf, Karl
LU
(2017)
In Applied Ergonomics
66.
p.52-63
- Abstract
- Stair ascending performance is critical during evacuation from buildings and underground infrastructures. Healthy subjects performed self-paced ascent in three settings: 13 floor building, 31 floor building, 33 m stationary subway escalator. To investigate leg muscle and cardiorespiratory capacities and how they constrain performance, oxygen uptake (VO2), heart rate (HR) and ascending speed were measured in all three; electromyography (EMG) in the first two. The VO2 and HR ranged from 89-96 % of the maximum capacity reported in the literature. The average highest VO2 and HR ranged from 39-41 mL·kg-1·min-1 and 162-174 b·min-1, respectively. The subjects were able to sustain their initial preferred maximum pace for a short duration, while... (More)
- Stair ascending performance is critical during evacuation from buildings and underground infrastructures. Healthy subjects performed self-paced ascent in three settings: 13 floor building, 31 floor building, 33 m stationary subway escalator. To investigate leg muscle and cardiorespiratory capacities and how they constrain performance, oxygen uptake (VO2), heart rate (HR) and ascending speed were measured in all three; electromyography (EMG) in the first two. The VO2 and HR ranged from 89-96 % of the maximum capacity reported in the literature. The average highest VO2 and HR ranged from 39-41 mL·kg-1·min-1 and 162-174 b·min-1, respectively. The subjects were able to sustain their initial preferred maximum pace for a short duration, while the average step rate was 92-95 steps·min-1. In average, VO2 reached relatively stable values at ≈37 mL·kg-1·min-1. EMG amplitudes decreased significantly and frequencies were unchanged. Speed reductions indicate that climbing capacity declined in the process of fatigue development. In the two buildings, the reduction of muscle power allowed the subjects to extend their tolerance and complete ascents in the 48 m and 109 m high stairways in 2.9 and 7.8 minutes, respectively. Muscle activity interpretation squares were developed and proved advantageous to observe fatigue and recovery over time. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2c4dc110-87c6-4854-b985-156f6da6c07a
- author
- Halder, Amitava
LU
; Kuklane, Kalev
LU
; Gao, Chuansi
LU
; Miller, Michael
LU
; Delin, Mattias
LU
; Norén, Johan
LU
and Fridolf, Karl
LU
- organization
- publishing date
- 2017-08-30
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Physical capacity, Stair climbing, Oxygen consumption, Electromyography, Muscle fatigue
- in
- Applied Ergonomics
- volume
- 66
- pages
- 11 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:85027714682
- pmid:28958430
- wos:000413281900006
- ISSN
- 0003-6870
- DOI
- 10.1016/j.apergo.2017.08.003
- project
- Physical work capacity and biomechanical aspects as limiting factors in challenging environments
- language
- English
- LU publication?
- yes
- id
- 2c4dc110-87c6-4854-b985-156f6da6c07a
- date added to LUP
- 2017-08-31 15:46:03
- date last changed
- 2024-06-09 22:35:12
@article{2c4dc110-87c6-4854-b985-156f6da6c07a,
abstract = {{Stair ascending performance is critical during evacuation from buildings and underground infrastructures. Healthy subjects performed self-paced ascent in three settings: 13 floor building, 31 floor building, 33 m stationary subway escalator. To investigate leg muscle and cardiorespiratory capacities and how they constrain performance, oxygen uptake (VO2), heart rate (HR) and ascending speed were measured in all three; electromyography (EMG) in the first two. The VO2 and HR ranged from 89-96 % of the maximum capacity reported in the literature. The average highest VO2 and HR ranged from 39-41 mL·kg-1·min-1 and 162-174 b·min-1, respectively. The subjects were able to sustain their initial preferred maximum pace for a short duration, while the average step rate was 92-95 steps·min-1. In average, VO2 reached relatively stable values at ≈37 mL·kg-1·min-1. EMG amplitudes decreased significantly and frequencies were unchanged. Speed reductions indicate that climbing capacity declined in the process of fatigue development. In the two buildings, the reduction of muscle power allowed the subjects to extend their tolerance and complete ascents in the 48 m and 109 m high stairways in 2.9 and 7.8 minutes, respectively. Muscle activity interpretation squares were developed and proved advantageous to observe fatigue and recovery over time.}},
author = {{Halder, Amitava and Kuklane, Kalev and Gao, Chuansi and Miller, Michael and Delin, Mattias and Norén, Johan and Fridolf, Karl}},
issn = {{0003-6870}},
keywords = {{Physical capacity; Stair climbing; Oxygen consumption; Electromyography; Muscle fatigue}},
language = {{eng}},
month = {{08}},
pages = {{52--63}},
publisher = {{Elsevier}},
series = {{Applied Ergonomics}},
title = {{Limitations of oxygen uptake and leg muscle activity during ascending evacuation in stairways}},
url = {{http://dx.doi.org/10.1016/j.apergo.2017.08.003}},
doi = {{10.1016/j.apergo.2017.08.003}},
volume = {{66}},
year = {{2017}},
}