Key result
24 hours of sleep deprivation did not alter H-reflex and V-wave responses (p > 0.05) but significantly increased antagonist/agonist co-activation during maximal voluntary contraction (p < 0.01).
Why the study?
The impact of sleep deprivation on muscular strength and power remains poorly understood.
Does 24 hours of sleep deprivation affect H-reflex and V-wave excitability in healthy young adults?
Does 24 hours of sleep deprivation affect H-reflex and V-wave excitability in healthy young adults?
Acute sleep deprivation preserves descending neural drive but exacerbates antagonist/agonist co-activation during forceful muscle contractions.
Answers are grounded in this paper and cite their sources.
Preserved spinal excitability after 24h sleep deprivation in healthy adults warrants caution before generalizing; leaves open performance or patient impacts.
The impact of sleep deprivation on muscular strength and power remains poorly understood. We aimed to determine the acute effects of 24 hr of sleep deprivation on H-reflex and V-wave excitability. Fourteen healthy young adults (eight men, six women) were included. Participants visited the laboratory on two different occasions, without and with 24 hr of sleep deprivation. In each session, participants were tested for maximal voluntary contraction (MVC) of the plantar flexors and dorsiflexors, soleus H- and M-recruitment curves, and evoked V wave, as well as tibialis anterior/soleus electromyographic co-activation. Twenty-four hours of sleep deprivation did not affect either plantarflexion MVC or soleus electromyographic normalized amplitude (p > .05). Moreover, H-reflex and V-wave peak-to-peak normalized amplitude did not change with sleep deprivation (p > .05). Conversely, we obtained a significant increase in antagonist/agonist level of co-activation during MVC post-sleep deprivation (6.2 ± 5.2%, p < .01). In conclusion, we found that H-reflex and V-wave responses are well preserved after 24 hr of sleep deprivation, revealing that descending neural drive and/or modulation in Ia afferent input remains largely unaffected under these circumstances. Yet, sleep deprivation affects motor control by exacerbating the magnitude of antagonist/agonist co-activation during forceful muscle contractions and this is novel.
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Gonçalves et al. (2020) studied Healthy (n=14). Sleep deprivation vs. Without sleep deprivation was evaluated on H-reflex and V-wave excitability (p=> .05). 24 hours of sleep deprivation did not alter H-reflex and V-wave responses (p > 0.05) but significantly increased antagonist/agonist co-activation during maximal voluntary contraction (p < 0.01).
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