e-journal

Acute short-term dim light exposure can lower muscle strength endurance

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Background: Since it has been shown that spending 18 h under dim light conditions can result in reduced handgrip endurance, it was questioned whether or not a shorter exposure to dim light (i.e., 1 h) would have similar influence upon muscular endurance. Therefore this study compared the number of weighted knee extension lifts that could be done after spending 1 h in either dim or bright light.
Methods: Participants (5 women, 11 men, college students 19e26 years) performed knee extension lifts to exhaustion with a load approximating 40% of their body weight. The lifts to exhaustion were measured immediately following 1 h of exposure to each of the following three conditions:dark (DL), room light (RL), and room light plus 5 mg melatonin (RLM). A minimum of 48 h separated each condition, and all participants started the exposures in a rested fed condition.
Results: Average (
SD) number of knee extension lifts for RL (62.0
22.0) was significantly ( p < 0.05) greater than DL (51.4
14.7) and RLM (57.8
22.9). The number of RLM knee extension lifts was not significantly different from DL. Exposure to 1 h of dim light immediately prior to activity can result in a reduction in thigh muscle endurance. The decline in performance to short-term dim light exposure was similar to that found following longer-term exposure.
Conclusion: It appears that light intensity can influence muscle endurance, however, at this time this effect cannot be directly related to endogenous melatonin production.

Keywords: Blood glucose; Blood pressure; Heart rate; Knee extension endurance; Light intensity; Melatonin

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Ketersediaan

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Informasi Detail

Judul Seri

Journal of Sport and Health Science

No. Panggil

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Penerbit

: Shanghai University of Sport., 2015

Deskripsi Fisik

Journal of Sport and Health Science 4 (2015) 270e274

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

Sport And Kesehatan

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

Versi lain/terkait

Lampiran Berkas

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