Prior heat stress effects fatigue recovery of the elbow flexor muscles

Iguchi, Masaki; Shields, Richard K.

doi:10.1002/mus.22029

Cited by 9 publications

(25 citation statements)

References 62 publications

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“…The mean peak MVC torque was 1.49 ± 0.19 and 1.53 ± 0.22 Nm before and after the control condition (p = 0.32), respectively; while the mean peak EMG (RMS) was 1.9 ± 0.26 and 2.15 mV ± 0.21 after the control condition (p = 0.28). These findings are consistent with our previous reports (Iguchi et al, 2011). Extensive preliminary data also support that three MVC’s followed by 10 minutes rest do not alter MEPs (Iguchi et al, 2011).…”

Section: Methodssupporting

confidence: 94%

“…These findings are consistent with our previous reports (Iguchi et al, 2011). Extensive preliminary data also support that three MVC’s followed by 10 minutes rest do not alter MEPs (Iguchi et al, 2011). In addition, pilot data from our lab support that M waves are highly reproducible before versus after heat stress (8.12 mV versus 7.8 mV; p = 0.6).…”

Section: Methodssupporting

confidence: 94%

“…Tympanic temperature increased rapidly by approximately 2° C by the end of the 30 minutes of heat stress. Mean tympanic temperature using this protocol showed subjects return near baseline (< 0.25° C difference) by 25–30 minutes after leaving the chamber (Iguchi et al, 2011), the approximate time of the cortical mapping and MEP recruitment procedures. HR increased to 126–128 beats/min after 30 minutes of heat, or approximately 65% of age-predicted maximum.…”

Section: Resultsmentioning

confidence: 93%

“…This raises the question of whether systemic passive heat stress, in the absence of muscular exertion, can enhance CNS plasticity in humans. Prior findings from our laboratory have demonstrated that 30 minutes of whole-body heat stress increased heart rate to approximately 65% of age-predicted maximum and core temperature by 0.82° C (Iguchi et al, 2011). Serum catecholamine hormones (norepinephrine and epinephrine) increased approximately 60% and prolactin, an indirect marker of serotonergic neurotransmitter activity, increased nearly three-fold (Iguchi et al, 2011, Iguchi, 2012).…”

Section: Introductionmentioning

confidence: 86%

“…Prior findings from our laboratory have demonstrated that 30 minutes of whole-body heat stress increased heart rate to approximately 65% of age-predicted maximum and core temperature by 0.82° C (Iguchi et al, 2011). Serum catecholamine hormones (norepinephrine and epinephrine) increased approximately 60% and prolactin, an indirect marker of serotonergic neurotransmitter activity, increased nearly three-fold (Iguchi et al, 2011, Iguchi, 2012). Functionally, acute pharmacological enhancement of norepinephrine agonists has been associated with training-dependent increases in evoked motor cortex excitability and motor skill acquisition in the upper extremity (Plewnia et al, 2002, Plewnia et al, 2004).…”

Section: Introductionmentioning

confidence: 86%

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Whole body heat stress increases motor cortical excitability and skill acquisition in humans

Littmann

Shields

2016

Clinical Neurophysiology

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Objective Vigorous systemic exercise stimulates a cascade of molecular and cellular processes that enhance central nervous system (CNS) plasticity and performance. The influence of heat stress on CNS performance and learning is novel. We designed two experiments to determine whether passive heat stress 1) facilitated motor cortex excitability and 2) improved motor task acquisition compared to no heat stress. Methods Motor evoked potentials (MEPs) from the first dorsal interosseus (FDI) were collected before and after 30 minutes of heat stress at 73° C. A second cohort of subjects performed a motor learning task using the FDI either following heat or the no heat condition. Results Heat stress increased heart rate to 65% of age-predicted maximum. After heat, mean resting MEP amplitude increased 48% (P < 0.05). MEP stimulus-response amplitudes did not differ according to stimulus intensity. In the second experiment, heat stress caused a significant decrease in absolute and variable error (p < 0.05) during a novel movement task using the FDI. Conclusions Passive environmental heat stress 1) increases motor cortical excitability, and 2) enhances performance in a motor skill acquisition task. Significance Controlled heat stress may prime the CNS to enhance motor skill acquisition during rehabilitation.

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Section: Methodssupporting

confidence: 94%

Section: Methodssupporting

confidence: 94%

Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 86%

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Whole body heat stress increases motor cortical excitability and skill acquisition in humans

Littmann

Shields

2016

Clinical Neurophysiology

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Turning Up the Heat: An Evaluation of the Evidence for Heating to Promote Exercise Recovery, Muscle Rehabilitation and Adaptation

et al. 2018

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Historically, heat has been used in various clinical and sports rehabilitation settings to treat soft tissue injuries. More recently, interest has emerged in using heat to pre-condition muscle against injury. The aim of this narrative review was to collate information on different types of heat therapy, explain the physiological rationale for heat therapy, and to summarise and evaluate the effects of heat therapy before, during and after muscle injury, immobilisation and strength training. Studies on skeletal muscle cells demonstrate that heat attenuates cellular damage and protein degradation (following in vitro challenges/insults to the cells). Heat also increases the expression of heat shock proteins (HSPs) and upregulates the expression of genes involved in muscle growth and differentiation. In rats, applying heat before and after muscle injury or immobilisation typically reduces cellular damage and muscle atrophy, and promotes more rapid muscle growth/regeneration. In humans, some research has demonstrated benefits of microwave diathermy (and, to a lesser extent, hot water immersion) before exercise for restricting muscle soreness and restoring muscle function after exercise. By contrast, the benefits of applying heat to muscle after exercise are more variable. Animal studies reveal that applying heat during limb immobilisation attenuates muscle atrophy and oxidative stress. Heating muscle may also enhance the benefits of strength training for improving muscle mass in humans. Further research is needed to identify the most effective forms of heat therapy and to investigate the benefits of heat therapy for restricting muscle wasting in the elderly and those individuals recovering from serious injury or illness.

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Neuromuscular and gene signaling responses to passive whole-body heat stress in young adults

Yen,

Petrie,

Suneja

et al. 2023

Journal of Thermal Biology

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Prior heat stress effects fatigue recovery of the elbow flexor muscles

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.

Cited by 9 publications

References 62 publications

Whole body heat stress increases motor cortical excitability and skill acquisition in humans

Whole body heat stress increases motor cortical excitability and skill acquisition in humans

Turning Up the Heat: An Evaluation of the Evidence for Heating to Promote Exercise Recovery, Muscle Rehabilitation and Adaptation

Neuromuscular and gene signaling responses to passive whole-body heat stress in young adults

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