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The energy cost and efficiency of treadmill walking at different rates of vertical ascent and grade.

Year: 1971
Type: article
Abstract: g a t o r s have shown t h a t t h e p h y s i o l o g i c a l c o s t (defined a s t h e energy expenditure) of a gross dynamic.muscularwork t a s k i s n o t only a f u n c t i o n of t h e work r a t e (defined a s t h e e x t e r n a l work done by t h e body) b u t appears a l s o t o vary according t o t h e p a r t i c u l a r combination of speed and tension used t o achieve t h a t work rate.This study i n v e s t i g a t e d t h e i n f l u e n c e of t h e r a t e of v e r t i c a l a s c e n t (and hence work r a t e commensurate w i t h body weight) and t h e i n c l i n a t i o n of s l o p e on t h e energy c o s t , and hence e f f i c i e n c y , of grade walking.Three r a t e s of v e r t i c a l ascent w e r e chosen (1300, 1800 and 2300 f t l h r ) and f o u r grades were used t o achieve each of t h e s e rates (12, 16, 20 and 24%).The energy c o s t was c a l c u l a t e d from r e s p i r a t o r y gas measurements.Energy c o s t was c a l c u l a t e d f o r each of f o u r phases, namely, s t a n d i n g , h o r i z o n t a l walking ( a t t h e same t r e a d m i l l speed a s f o r t h e subsequent grade walking), grade walking and recovery.Three t r i a l s ( r e p l i c a t i o n s ) were made a t each combination of r a t e of v e r t i c a l a s c e n t and grade t o ensure g r e a t e r r e l i a b i l i t y of t h e d a t a .Three measures of e f f i c i e n c y were computed: ( i ) g r o s s e f f i c i e n c y , ( i i ) n e t e f f i c i e n c y c a l c u l a t e d using t h e d i f f e r e n c e between t h e energy c o s t of grade walking and standing (NES), ( i i i ) n e t e f f i c i e n c y c a l c u l a t e d using t h e d i f f e r e n c e between t h e energy c o s t of gradewalking and h o r i z o n t a l iii Numerous people a s s i s t e d i n t h e process of producing this t h e s i s .M y f i r s t thanks must go t o t h e s i x s u b j e c t s ,
Language: English
Field: Medicine
Open Access status: green
OpenAlex ID: W649692194
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Cites: 20
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Related to: 10