Effects of different types of jump impact on trabecular bone mass and microarchitecture in growing rats.

Substantial evidence from animal studies indicates that jumping increases bone mass and strength. However, most studies have focused on the take-off, rather than the landing phase of jumps. Thus, we compared the effects of landing and upward jump impact on trabecular bone mass and microarchitecture....

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Autores principales:	Yong-In Ju, Teruki Sone, Kazuhiro Ohnaru, Kensuke Tanaka, Hidetaka Yamaguchi, Masao Fukunaga
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3ce7dd2c7b5f435d85b1881e628c0133
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spelling	oai:doaj.org-article:3ce7dd2c7b5f435d85b1881e628c01332021-11-25T06:00:09ZEffects of different types of jump impact on trabecular bone mass and microarchitecture in growing rats.1932-620310.1371/journal.pone.0107953https://doaj.org/article/3ce7dd2c7b5f435d85b1881e628c01332014-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0107953https://doaj.org/toc/1932-6203Substantial evidence from animal studies indicates that jumping increases bone mass and strength. However, most studies have focused on the take-off, rather than the landing phase of jumps. Thus, we compared the effects of landing and upward jump impact on trabecular bone mass and microarchitecture. Male Wistar rats aged 10 weeks were randomly assigned to the following groups: sedentary control (CON), 40-cm upward jumps (40UJ); 40-cm drop jumps (40DJ); and 60-cm drop jumps (60DJ) (n = 10 each). The upward jump protocol comprised 10 upward jumps/day, 5 days/week for 8 weeks to a height of 40 cm. The drop jump protocol comprised dropping rats from a height of 40 or 60 cm at the same frequency and time period as the 40UJ group. Trabecular bone mass, architecture, and mineralization at the distal femoral metaphysis were evaluated using microcomputed tomography. Ground reaction force (GRF) was measured using a force platform. Bone mass was significantly higher in the 40UJ group compared with the DJ groups (+49.1% and +28.3%, respectively), although peak GRF (-57.8% and -122.7%, respectively) and unit time force (-21.6% and -36.2%, respectively) were significantly lower in the 40UJ group. These results showed that trabecular bone mass in growing rats is increased more effectively by the take-off than by the landing phases of jumps and suggest that mechanical stress accompanied by muscle contraction would be more important than GRF as an osteogenic stimulus. However, the relevance of these findings to human bone physiology is unclear and requires further study.Yong-In JuTeruki SoneKazuhiro OhnaruKensuke TanakaHidetaka YamaguchiMasao FukunagaPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 9, p e107953 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yong-In Ju Teruki Sone Kazuhiro Ohnaru Kensuke Tanaka Hidetaka Yamaguchi Masao Fukunaga Effects of different types of jump impact on trabecular bone mass and microarchitecture in growing rats.
description	Substantial evidence from animal studies indicates that jumping increases bone mass and strength. However, most studies have focused on the take-off, rather than the landing phase of jumps. Thus, we compared the effects of landing and upward jump impact on trabecular bone mass and microarchitecture. Male Wistar rats aged 10 weeks were randomly assigned to the following groups: sedentary control (CON), 40-cm upward jumps (40UJ); 40-cm drop jumps (40DJ); and 60-cm drop jumps (60DJ) (n = 10 each). The upward jump protocol comprised 10 upward jumps/day, 5 days/week for 8 weeks to a height of 40 cm. The drop jump protocol comprised dropping rats from a height of 40 or 60 cm at the same frequency and time period as the 40UJ group. Trabecular bone mass, architecture, and mineralization at the distal femoral metaphysis were evaluated using microcomputed tomography. Ground reaction force (GRF) was measured using a force platform. Bone mass was significantly higher in the 40UJ group compared with the DJ groups (+49.1% and +28.3%, respectively), although peak GRF (-57.8% and -122.7%, respectively) and unit time force (-21.6% and -36.2%, respectively) were significantly lower in the 40UJ group. These results showed that trabecular bone mass in growing rats is increased more effectively by the take-off than by the landing phases of jumps and suggest that mechanical stress accompanied by muscle contraction would be more important than GRF as an osteogenic stimulus. However, the relevance of these findings to human bone physiology is unclear and requires further study.
format	article
author	Yong-In Ju Teruki Sone Kazuhiro Ohnaru Kensuke Tanaka Hidetaka Yamaguchi Masao Fukunaga
author_facet	Yong-In Ju Teruki Sone Kazuhiro Ohnaru Kensuke Tanaka Hidetaka Yamaguchi Masao Fukunaga
author_sort	Yong-In Ju
title	Effects of different types of jump impact on trabecular bone mass and microarchitecture in growing rats.
title_short	Effects of different types of jump impact on trabecular bone mass and microarchitecture in growing rats.
title_full	Effects of different types of jump impact on trabecular bone mass and microarchitecture in growing rats.
title_fullStr	Effects of different types of jump impact on trabecular bone mass and microarchitecture in growing rats.
title_full_unstemmed	Effects of different types of jump impact on trabecular bone mass and microarchitecture in growing rats.
title_sort	effects of different types of jump impact on trabecular bone mass and microarchitecture in growing rats.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/3ce7dd2c7b5f435d85b1881e628c0133
work_keys_str_mv	AT yonginju effectsofdifferenttypesofjumpimpactontrabecularbonemassandmicroarchitectureingrowingrats AT terukisone effectsofdifferenttypesofjumpimpactontrabecularbonemassandmicroarchitectureingrowingrats AT kazuhiroohnaru effectsofdifferenttypesofjumpimpactontrabecularbonemassandmicroarchitectureingrowingrats AT kensuketanaka effectsofdifferenttypesofjumpimpactontrabecularbonemassandmicroarchitectureingrowingrats AT hidetakayamaguchi effectsofdifferenttypesofjumpimpactontrabecularbonemassandmicroarchitectureingrowingrats AT masaofukunaga effectsofdifferenttypesofjumpimpactontrabecularbonemassandmicroarchitectureingrowingrats
_version_	1718414275312091136

Effects of different types of jump impact on trabecular bone mass and microarchitecture in growing rats.

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