PRIOR HEAT STRESS EFFECTS FATIGUE RECOVERY OF THE ELBOW FLEXOR MUSCLES

Masaki IGUCHI; Richard K SHIELDS

doi:10.1002/mus.22029

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PRIOR HEAT STRESS EFFECTS FATIGUE RECOVERY OF THE ELBOW FLEXOR MUSCLES

Journal article

Open access

Peer reviewed

PRIOR HEAT STRESS EFFECTS FATIGUE RECOVERY OF THE ELBOW FLEXOR MUSCLES

Masaki IGUCHI and Richard K SHIELDS

Muscle & nerve, Vol.44(1), pp.115-125

2011

DOI: 10.1002/mus.22029

PMCID: PMC3117202

PMID: 21674526

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https://www.ncbi.nlm.nih.gov/pmc/articles/3117202View

Open Access

Abstract

Introduction: Long-lasting alterations in hormones, neurotransmitters, and stress proteins after hyperthermia may be responsible for the impairment in motor performance during muscle fatigue. Methods: Subjects (n = 25) performed a maximal intermittent fatigue task of elbow flexion after sitting in either 73° or 26°C to examine the effects of prior heat stress on fatigue mechanisms. Results: The heat stress increased the tympanic and rectal temperatures by 2.3° and 0.82°C, respectively, but there was full recovery prior to the fatigue task. Although prior heat stress had no effects on fatigue-related changes in volitional torque, electromyographic (EMG) activity, torque relaxation rate, motor evoked potential (MEP) size, and silent period (SP) duration, prior heat stress acutely increased the pre-fatigue relaxation rate and chronically prevented long-duration fatigue (P < 0.05). Conclusions: These findings indicate that prior passive heat stress alone does not alter voluntary activation during fatigue, but prior heat stress and exercise produce longer-term protection against long-duration fatigue.

Fundamental and applied biological sciences. Psychology

Biological and medical sciences

Vertebrates: osteoarticular system, musculoskeletal system

Striated muscle. Tendons

Details

Title: Subtitle: PRIOR HEAT STRESS EFFECTS FATIGUE RECOVERY OF THE ELBOW FLEXOR MUSCLES
Creators: Masaki IGUCHI - Physical Therapy and Rehabilitation Science, Carver College of Medicine, 1-252 Medical Education Building, University of Iowa, Iowa City, Iowa 52242-1190, United States
Richard K SHIELDS - Physical Therapy and Rehabilitation Science, Carver College of Medicine, 1-252 Medical Education Building, University of Iowa, Iowa City, Iowa 52242-1190, United States
Resource Type: Journal article
Publication Details: Muscle & nerve, Vol.44(1), pp.115-125
DOI: 10.1002/mus.22029
PMID: 21674526
PMCID: PMC3117202
NLM abbreviation: Muscle Nerve
ISSN: 0148-639X
eISSN: 1097-4598
Publisher: Wiley; Hoboken, NJ
Language: English
Date published: 2011
Academic Unit: Orthopedics and Rehabilitation; Physical Therapy and Rehabilitation Science
Record Identifier: 9984047634702771

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