{"title":"Short-term strength adaptation in isometric training to volitional failure depends on initial specific tension in elbow flexors","authors":"ZhenFei Zou, Naoshi Morimoto, Miyuki Nakatani, Hirotsugu Morinaga, Yohei Takai","doi":"10.7600/jpfsm.12.161","DOIUrl":"https://doi.org/10.7600/jpfsm.12.161","url":null,"abstract":"","PeriodicalId":55847,"journal":{"name":"Journal of Physical Fitness and Sports Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136227501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The purpose of this study was to investigate the effects of stimulation conditions (pressing force and frequency) and subcutaneous tissue properties (thickness and hardness) on the changes in tendon blood circulation caused by acupressure. Before and after acupressure, blood circulation of the Achilles tendon was measured using red laser lights. Acupressure was applied to the Achilles tendon for 3-min under three conditions. The following four conditions (including no stimulation condition) with different combinations of pressing forces and frequencies were established: 1) 50N and 1.5Hz, 2) 25N and 3.0Hz, 3) 25N and 1.5Hz, and 4) no stimulation. In addition, the thickness and hardness of subcutaneous tissue at the acupressure-stimulated site were measured. The change in total hemoglobin (corresponding to blood volume) showed a significant main effect of condition, but the effects of time and the interaction between conditions and time were not significant. On average, the most significant increase in tendon blood volume was observed in the 50N and 1.5Hz condition, although the post-hoc test showed no significant difference. The subcutaneous tissue thickness and hardness were not significantly correlated with tendon blood volume changes after stimulation in any of the three conditions. In conclusion, the present results indicate that acupressure under the conditions of pressing force 50N and frequency 1.5Hz changed tendon blood circulation the most, though not based on exact statistical results. Furthermore, the subcutaneous tissue thickness and hardness (including tendon) have no effect on tendon blood circulation induced by stimulation.
{"title":"Effects of stimulation conditions and subcutaneous tissue properties on acupressure-induced changes in blood circulation of human tendons","authors":"Ayaka Yasuda, Shuhei Sasajima, Takehiro Kosaka, Soushi Mino, Keitaro Kubo","doi":"10.7600/jpfsm.12.147","DOIUrl":"https://doi.org/10.7600/jpfsm.12.147","url":null,"abstract":"The purpose of this study was to investigate the effects of stimulation conditions (pressing force and frequency) and subcutaneous tissue properties (thickness and hardness) on the changes in tendon blood circulation caused by acupressure. Before and after acupressure, blood circulation of the Achilles tendon was measured using red laser lights. Acupressure was applied to the Achilles tendon for 3-min under three conditions. The following four conditions (including no stimulation condition) with different combinations of pressing forces and frequencies were established: 1) 50N and 1.5Hz, 2) 25N and 3.0Hz, 3) 25N and 1.5Hz, and 4) no stimulation. In addition, the thickness and hardness of subcutaneous tissue at the acupressure-stimulated site were measured. The change in total hemoglobin (corresponding to blood volume) showed a significant main effect of condition, but the effects of time and the interaction between conditions and time were not significant. On average, the most significant increase in tendon blood volume was observed in the 50N and 1.5Hz condition, although the post-hoc test showed no significant difference. The subcutaneous tissue thickness and hardness were not significantly correlated with tendon blood volume changes after stimulation in any of the three conditions. In conclusion, the present results indicate that acupressure under the conditions of pressing force 50N and frequency 1.5Hz changed tendon blood circulation the most, though not based on exact statistical results. Furthermore, the subcutaneous tissue thickness and hardness (including tendon) have no effect on tendon blood circulation induced by stimulation.","PeriodicalId":55847,"journal":{"name":"Journal of Physical Fitness and Sports Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136227499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Physical training changes the metabolic state, but such changes are difficult to quantify directly and non-invasively in humans. This study therefore used breath tests with 13C stable isotope glucose to assess glucose metabolism in endurance athletes. Our breath test measured the ratio of 13C to 12C in CO2 from expired air to derive 13C excretion per unit time. We compared 13C excretion levels between long-distance runners (runner group) and non-trained healthy males (control group), in both conditions with and without 50 g oral glucose loading (OGL). The 13C excretion was lower in the runner group than in the control group throughout the 6-hour period, regardless of OGL. Therefore, the area under the curve, which indicates total excretion, was lower in the runner group. There are many reports related to the adaptation of glucose metabolism in training (including gluconeogenesis, glucose transport to the liver and muscle, and glycogen synthesis). Our study showed that this breath test could be a simple and convenient way to monitor the overall glucose metabolic adaptation state in the athlete body.
{"title":"<sup>13</sup>C-glucose breath test quantifies differences in glucose metabolism between endurance and non-athletes","authors":"Takahiko J Fujimi, Yuko Mekata, Kaori Kikuchi, Kyoka Musha, Tomokazu Matsuura","doi":"10.7600/jpfsm.12.141","DOIUrl":"https://doi.org/10.7600/jpfsm.12.141","url":null,"abstract":"Physical training changes the metabolic state, but such changes are difficult to quantify directly and non-invasively in humans. This study therefore used breath tests with 13C stable isotope glucose to assess glucose metabolism in endurance athletes. Our breath test measured the ratio of 13C to 12C in CO2 from expired air to derive 13C excretion per unit time. We compared 13C excretion levels between long-distance runners (runner group) and non-trained healthy males (control group), in both conditions with and without 50 g oral glucose loading (OGL). The 13C excretion was lower in the runner group than in the control group throughout the 6-hour period, regardless of OGL. Therefore, the area under the curve, which indicates total excretion, was lower in the runner group. There are many reports related to the adaptation of glucose metabolism in training (including gluconeogenesis, glucose transport to the liver and muscle, and glycogen synthesis). Our study showed that this breath test could be a simple and convenient way to monitor the overall glucose metabolic adaptation state in the athlete body.","PeriodicalId":55847,"journal":{"name":"Journal of Physical Fitness and Sports Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135769449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Álvaro Miguel-Ortega, Julio Calleja-González, Juan Mielgo-Ayuso
Basketball is a popular team sport worldwide. Nutrition is one of the key aspects for the optimization of performance and subsequent recovery. Female athletes have unique nutritional requirements as a result of daily training and competition, in addition to the specific demands of gender-related physiological changes. However, inadequate, or erroneous nutritional behaviours are commonly observed. Thus, the aim of our work is to provide concise nutritional recommendations for female basketball players. Based on a review of the literature, there is limited evidence that comprehensively assesses health attributes as well as behaviours, habits, and nutritional knowledge of physical activity by gender in basketball players. Recent research highlights the need for nutritional strategies to develop tools to help manage energy deficiency in women’s sports. We suggest that individual adjustment of dietary energy value is the key factor in the physical performance of female basketball players; information that could be used to optimize the training process and health maintenance. The recommended intake for athletes involved in moderate levels of training, such as elite basketball players (2-3 h/day for 5-6 times/week), is 50-80 kcal·(kg·day)-1, with specific recommendations of 1.6-1.8 g·(kg·day)-1 protein. For physically active women, it is recommended that 1.2-2 g·(kg·day)-1 of protein be consumed, with fat intake of 20-35% of total kilocalories and 5-8 g·(kg·day)-1 of carbohydrate to adequately meet performance demands.
{"title":"Nutrition-related considerations for health and performance in female basketball players: a narrative review","authors":"Álvaro Miguel-Ortega, Julio Calleja-González, Juan Mielgo-Ayuso","doi":"10.7600/jpfsm.12.119","DOIUrl":"https://doi.org/10.7600/jpfsm.12.119","url":null,"abstract":"Basketball is a popular team sport worldwide. Nutrition is one of the key aspects for the optimization of performance and subsequent recovery. Female athletes have unique nutritional requirements as a result of daily training and competition, in addition to the specific demands of gender-related physiological changes. However, inadequate, or erroneous nutritional behaviours are commonly observed. Thus, the aim of our work is to provide concise nutritional recommendations for female basketball players. Based on a review of the literature, there is limited evidence that comprehensively assesses health attributes as well as behaviours, habits, and nutritional knowledge of physical activity by gender in basketball players. Recent research highlights the need for nutritional strategies to develop tools to help manage energy deficiency in women’s sports. We suggest that individual adjustment of dietary energy value is the key factor in the physical performance of female basketball players; information that could be used to optimize the training process and health maintenance. The recommended intake for athletes involved in moderate levels of training, such as elite basketball players (2-3 h/day for 5-6 times/week), is 50-80 kcal·(kg·day)-1, with specific recommendations of 1.6-1.8 g·(kg·day)-1 protein. For physically active women, it is recommended that 1.2-2 g·(kg·day)-1 of protein be consumed, with fat intake of 20-35% of total kilocalories and 5-8 g·(kg·day)-1 of carbohydrate to adequately meet performance demands.","PeriodicalId":55847,"journal":{"name":"Journal of Physical Fitness and Sports Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135769450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kazuya Tamura, Yuya Ueda, Takashi Saito, Ryo Goto, Naoki Yamada, Kiyomasa Nakatsuka, Kazuaki Uchida, Kana Horibe, Kenta Saeki, Haruhi Encho, Masato Tezuka, Mao Mukaijo, Rei Ono
{"title":"Relationship between peer group size and active outdoor play in children aged 9–12 years","authors":"Kazuya Tamura, Yuya Ueda, Takashi Saito, Ryo Goto, Naoki Yamada, Kiyomasa Nakatsuka, Kazuaki Uchida, Kana Horibe, Kenta Saeki, Haruhi Encho, Masato Tezuka, Mao Mukaijo, Rei Ono","doi":"10.7600/jpfsm.12.133","DOIUrl":"https://doi.org/10.7600/jpfsm.12.133","url":null,"abstract":"","PeriodicalId":55847,"journal":{"name":"Journal of Physical Fitness and Sports Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135769460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Detrimental impacts of acute mental stress on arterial function and exercise as a countermeasure","authors":"D. Kume","doi":"10.7600/jpfsm.12.95","DOIUrl":"https://doi.org/10.7600/jpfsm.12.95","url":null,"abstract":"","PeriodicalId":55847,"journal":{"name":"Journal of Physical Fitness and Sports Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45126520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tomoko Kaneko, H. Kumagai, Toru Yoshikawa, T. Tsujimoto, T. Miyauchi, Kiyoji Tanaka, S. Maeda
{"title":"Regular aerobic exercise decreases circulating estradiol/testosterone ratio in overweight and obese men","authors":"Tomoko Kaneko, H. Kumagai, Toru Yoshikawa, T. Tsujimoto, T. Miyauchi, Kiyoji Tanaka, S. Maeda","doi":"10.7600/jpfsm.12.101","DOIUrl":"https://doi.org/10.7600/jpfsm.12.101","url":null,"abstract":"","PeriodicalId":55847,"journal":{"name":"Journal of Physical Fitness and Sports Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43868976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hayaka Yokota, K. Kamijo, N. Mizuguchi, H. Kubo, Hiroki Nakata
{"title":"Motor imagery and action observation of whole-body movements for experienced motor repertoire: an fNIRS study","authors":"Hayaka Yokota, K. Kamijo, N. Mizuguchi, H. Kubo, Hiroki Nakata","doi":"10.7600/jpfsm.12.107","DOIUrl":"https://doi.org/10.7600/jpfsm.12.107","url":null,"abstract":"","PeriodicalId":55847,"journal":{"name":"Journal of Physical Fitness and Sports Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49466450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tetsuo Kobayashi, Y. Ogura, Satoshi Kishiro, M. Kurosaka, T. Yoshihara, R. Kakigi, Naoki Minakawa, Kenji Uehara, Tomohiro Suzuki, K. Goto, H. Niki
{"title":"Impacts of myosin heavy chain phenotypes on recovery of leg extension force after ACL-reconstructed knee","authors":"Tetsuo Kobayashi, Y. Ogura, Satoshi Kishiro, M. Kurosaka, T. Yoshihara, R. Kakigi, Naoki Minakawa, Kenji Uehara, Tomohiro Suzuki, K. Goto, H. Niki","doi":"10.7600/jpfsm.12.77","DOIUrl":"https://doi.org/10.7600/jpfsm.12.77","url":null,"abstract":"","PeriodicalId":55847,"journal":{"name":"Journal of Physical Fitness and Sports Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47415838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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