Changes in running economy following a repeated bout of downhill running

Trevor C. Chen; Hsin Liang Chen; Chang Jun Wu; Ming Ru Lin; Che Hsiu Chen; Li I. Wang; Shi Yi Wang; Jui Hung Tu

Changes in running economy following a repeated bout of downhill running

Trevor C. Chen^*, Hsin Liang Chen, Chang Jun Wu, Ming Ru Lin, Che Hsiu Chen, Li I. Wang, Shi Yi Wang, Jui Hung Tu

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

This study investigated whether a repeated bout of downhill running would result in less damage, and thus blunted changes in physiological and biomechanical running economy (RE) parameters, compared with changes induced by the first bout. Twelve male students performed two 30-minute bouts of downhill (-15%) running (DHR1, DHR2) at 70% of maximal aerobic capacity (V̇O _2max), separated by 5 days. Maximal isometric strength of the knee extensors (MVC), muscle soreness (SOR), and plasma myoglobin (Mb) concentration were measured before, and at 0.5, 24, 48, 72, 96 and 120 hours after both DHR1 and DHR2. All subjects performed a 5-minute bout of level running at 85% of V̇O_2max before, immediately after, and at 24, 48, 72, 96 and 120 hours after DHR1 and DHR2, during which oxygen consumption (V̇O ₂), minute ventilation (V̇_E), blood lactate (LA), heart rate (HR), respiratory exchange ratio (RER), and rating of perceived exertion (RPE) were measured. Stride length (SL), stride frequency (SF), and range of motion for the ankle (ROM-A) and knee (ROM-K) during the level runs were analyzed using high-speed (120Hz) video images. The results of this study showed that MVC decreased (p<0.05) after both DHR1 and DHR2, and that there was no significant difference in MVC loss between the two bouts. SOR was increased (p < 0.05) after DHR1, but was unchanged after DHR2. Mb concentration was elevated (p<0.05) after DHR1, with no further change (p>0.05) after DHR2. V̇O₂, V_E, RER, HR, RPE, LA, and SF were increased (p<0.05) for 72-96 hours after DHR1, but were elevated for only 24 hours after DHR2. Similarly, SL, ROM-A and ROM-K were decreased (p<0.05) for 72-96 hours after DHR1, but for only 24 hours after DHR2. It is concluded that DHR2 attenuated changes in markers of muscle damage, and in measures of physiological and biomechanical RE. We suggest that the attenuated changes in the physiological and biomechanical RE parameters after DHR2 may be related to the fact that less damage was caused by the second bout of exercise.

Original language	English
Pages (from-to)	109-117
Number of pages	9
Journal	Journal of Exercise Science and Fitness
Volume	5
Issue number	2
Publication status	Published - 2007
Externally published	Yes

Keywords

Blood lactate
Heart rate
Isometric strength
Muscle damage

ASJC Scopus subject areas

Physical Therapy, Sports Therapy and Rehabilitation
Public Health, Environmental and Occupational Health

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Cite this

@article{d54cb9a5d1284a3881d37b2f59cb3cb9,

title = "Changes in running economy following a repeated bout of downhill running",

abstract = "This study investigated whether a repeated bout of downhill running would result in less damage, and thus blunted changes in physiological and biomechanical running economy (RE) parameters, compared with changes induced by the first bout. Twelve male students performed two 30-minute bouts of downhill (-15%) running (DHR1, DHR2) at 70% of maximal aerobic capacity ({\.V}O 2max), separated by 5 days. Maximal isometric strength of the knee extensors (MVC), muscle soreness (SOR), and plasma myoglobin (Mb) concentration were measured before, and at 0.5, 24, 48, 72, 96 and 120 hours after both DHR1 and DHR2. All subjects performed a 5-minute bout of level running at 85% of {\.V}O2max before, immediately after, and at 24, 48, 72, 96 and 120 hours after DHR1 and DHR2, during which oxygen consumption ({\.V}O 2), minute ventilation ({\.V}E), blood lactate (LA), heart rate (HR), respiratory exchange ratio (RER), and rating of perceived exertion (RPE) were measured. Stride length (SL), stride frequency (SF), and range of motion for the ankle (ROM-A) and knee (ROM-K) during the level runs were analyzed using high-speed (120Hz) video images. The results of this study showed that MVC decreased (p<0.05) after both DHR1 and DHR2, and that there was no significant difference in MVC loss between the two bouts. SOR was increased (p < 0.05) after DHR1, but was unchanged after DHR2. Mb concentration was elevated (p<0.05) after DHR1, with no further change (p>0.05) after DHR2. {\.V}O2, VE, RER, HR, RPE, LA, and SF were increased (p<0.05) for 72-96 hours after DHR1, but were elevated for only 24 hours after DHR2. Similarly, SL, ROM-A and ROM-K were decreased (p<0.05) for 72-96 hours after DHR1, but for only 24 hours after DHR2. It is concluded that DHR2 attenuated changes in markers of muscle damage, and in measures of physiological and biomechanical RE. We suggest that the attenuated changes in the physiological and biomechanical RE parameters after DHR2 may be related to the fact that less damage was caused by the second bout of exercise.",

keywords = "Blood lactate, Heart rate, Isometric strength, Muscle damage",

author = "Chen, {Trevor C.} and Chen, {Hsin Liang} and Wu, {Chang Jun} and Lin, {Ming Ru} and Chen, {Che Hsiu} and Wang, {Li I.} and Wang, {Shi Yi} and Tu, {Jui Hung}",

year = "2007",

language = "English",

volume = "5",

pages = "109--117",

journal = "Journal of Exercise Science and Fitness",

issn = "1728-869X",

publisher = "Elsevier",

number = "2",

}

TY - JOUR

T1 - Changes in running economy following a repeated bout of downhill running

AU - Chen, Trevor C.

AU - Chen, Hsin Liang

AU - Wu, Chang Jun

AU - Lin, Ming Ru

AU - Chen, Che Hsiu

AU - Wang, Li I.

AU - Wang, Shi Yi

AU - Tu, Jui Hung

PY - 2007

Y1 - 2007

N2 - This study investigated whether a repeated bout of downhill running would result in less damage, and thus blunted changes in physiological and biomechanical running economy (RE) parameters, compared with changes induced by the first bout. Twelve male students performed two 30-minute bouts of downhill (-15%) running (DHR1, DHR2) at 70% of maximal aerobic capacity (V̇O 2max), separated by 5 days. Maximal isometric strength of the knee extensors (MVC), muscle soreness (SOR), and plasma myoglobin (Mb) concentration were measured before, and at 0.5, 24, 48, 72, 96 and 120 hours after both DHR1 and DHR2. All subjects performed a 5-minute bout of level running at 85% of V̇O2max before, immediately after, and at 24, 48, 72, 96 and 120 hours after DHR1 and DHR2, during which oxygen consumption (V̇O 2), minute ventilation (V̇E), blood lactate (LA), heart rate (HR), respiratory exchange ratio (RER), and rating of perceived exertion (RPE) were measured. Stride length (SL), stride frequency (SF), and range of motion for the ankle (ROM-A) and knee (ROM-K) during the level runs were analyzed using high-speed (120Hz) video images. The results of this study showed that MVC decreased (p<0.05) after both DHR1 and DHR2, and that there was no significant difference in MVC loss between the two bouts. SOR was increased (p < 0.05) after DHR1, but was unchanged after DHR2. Mb concentration was elevated (p<0.05) after DHR1, with no further change (p>0.05) after DHR2. V̇O2, VE, RER, HR, RPE, LA, and SF were increased (p<0.05) for 72-96 hours after DHR1, but were elevated for only 24 hours after DHR2. Similarly, SL, ROM-A and ROM-K were decreased (p<0.05) for 72-96 hours after DHR1, but for only 24 hours after DHR2. It is concluded that DHR2 attenuated changes in markers of muscle damage, and in measures of physiological and biomechanical RE. We suggest that the attenuated changes in the physiological and biomechanical RE parameters after DHR2 may be related to the fact that less damage was caused by the second bout of exercise.

AB - This study investigated whether a repeated bout of downhill running would result in less damage, and thus blunted changes in physiological and biomechanical running economy (RE) parameters, compared with changes induced by the first bout. Twelve male students performed two 30-minute bouts of downhill (-15%) running (DHR1, DHR2) at 70% of maximal aerobic capacity (V̇O 2max), separated by 5 days. Maximal isometric strength of the knee extensors (MVC), muscle soreness (SOR), and plasma myoglobin (Mb) concentration were measured before, and at 0.5, 24, 48, 72, 96 and 120 hours after both DHR1 and DHR2. All subjects performed a 5-minute bout of level running at 85% of V̇O2max before, immediately after, and at 24, 48, 72, 96 and 120 hours after DHR1 and DHR2, during which oxygen consumption (V̇O 2), minute ventilation (V̇E), blood lactate (LA), heart rate (HR), respiratory exchange ratio (RER), and rating of perceived exertion (RPE) were measured. Stride length (SL), stride frequency (SF), and range of motion for the ankle (ROM-A) and knee (ROM-K) during the level runs were analyzed using high-speed (120Hz) video images. The results of this study showed that MVC decreased (p<0.05) after both DHR1 and DHR2, and that there was no significant difference in MVC loss between the two bouts. SOR was increased (p < 0.05) after DHR1, but was unchanged after DHR2. Mb concentration was elevated (p<0.05) after DHR1, with no further change (p>0.05) after DHR2. V̇O2, VE, RER, HR, RPE, LA, and SF were increased (p<0.05) for 72-96 hours after DHR1, but were elevated for only 24 hours after DHR2. Similarly, SL, ROM-A and ROM-K were decreased (p<0.05) for 72-96 hours after DHR1, but for only 24 hours after DHR2. It is concluded that DHR2 attenuated changes in markers of muscle damage, and in measures of physiological and biomechanical RE. We suggest that the attenuated changes in the physiological and biomechanical RE parameters after DHR2 may be related to the fact that less damage was caused by the second bout of exercise.

KW - Blood lactate

KW - Heart rate

KW - Isometric strength

KW - Muscle damage

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M3 - Article

AN - SCOPUS:38349169553

SN - 1728-869X

VL - 5

SP - 109

EP - 117

JO - Journal of Exercise Science and Fitness

JF - Journal of Exercise Science and Fitness

IS - 2

ER -

Changes in running economy following a repeated bout of downhill running

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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