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  1. Article ; Online: Is obesity associated with foot structure and the strength of muscles that move the ankle in adult men?

    Xiaoguang Zhao / Fei Hu / Jiabin Yu / Zhexiao Zhou

    Journal of Men's Health, Vol 18, Iss 3, p

    2022  Volume 057

    Abstract: Background and objective: Obesity is associated with several internal medicine diseases and also impacts the musculoskeletal system, particularly in the foot and ankle. Obesity potentially affects the foot structure and the strength of the muscles ... ...

    Abstract Background and objective: Obesity is associated with several internal medicine diseases and also impacts the musculoskeletal system, particularly in the foot and ankle. Obesity potentially affects the foot structure and the strength of the muscles responsible for moving the ankle. The purpose of this study was to explore the association between obesity, foot structure and the strength of the muscles which move the ankle in adult men. Material and methods: 66 adult men were divided into a non-obese group (n = 19), an overweight group (n = 35) and an obese group (n = 12), based on each participant’s body mass index (BMI). Foot structure was measured using a three-dimensional foot scanner and the strength of the muscles that move the ankle was assessed with a dynamometer. Results: The study demonstrated the height, width and girth indicators of the foot to be greater among those in the overweight and obese groups than participants in the non-obese group (p < 0.05) and positive relationships were discovered between BMI and instep height, forefoot and rearfoot width and forefoot and instep girth (r = 0.223–0.423, p < 0.05). The overweight and obese men exhibited lower strength in the muscles that move the ankle (peak torque per body weight) than the non-obese men (p < 0.05) and correlation analysis proved BMI to be positively associated with dorsiflexion peak torque at 30 and 120 °/s angular velocity (r = 0.385 and 0.310, p < 0.05) and negatively associated with plantarflexion, dorsiflexion, eversion and inversion peak torque per body weight at 30 °/s and 120 °/s angular velocity (r = –0.244–0.462, p < 0.05). Conclusion: The findings of the study show that the height, width, and girth of the foot are greater and the strength of the muscles responsible for moving the ankle is lower in overweight and obese men.
    Keywords body mass index ; foot and ankle ; muscle strength ; musculoskeletal disorders ; obesity ; Medicine (General) ; R5-920
    Subject code 796
    Language English
    Publishing date 2022-02-01T00:00:00Z
    Publisher MRE PRESS
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Determination of the optimal drop height for male with different exercise level in drop jump by unilateral lower limb

    Dongxue Liu / Rui Xi / Zhexiao Zhou

    Journal of Men's Health, Vol 18, Iss 5, p

    2022  Volume 119

    Abstract: Background: Drop jump (DJ) is a kind of plyometric training. There is little research on the effect of drop height (DH) on unilateral DJ. This study explored the optimal DH of DJ by unilateral lower limb, aiming to provide a reference for males with ... ...

    Abstract Background: Drop jump (DJ) is a kind of plyometric training. There is little research on the effect of drop height (DH) on unilateral DJ. This study explored the optimal DH of DJ by unilateral lower limb, aiming to provide a reference for males with different exercise levels to avoid the imbalance between bilateral lower limbs and for coaches to develop accurate and effective unilateral DJ training programs. Methods: 18 college athletes and 13 physically active students were recruited to participate in this study and then asked to take three tests, namely “single-leg DJ at low height (L- SLDJ)”, “single-leg DJ at medium height (M-SLDJ)”, and “single-leg DJ at high height (H-SLDJ)”. Motion Capture System and Force Plate were used to synchronously collect motion parameters. Results: At M-SLDJ, both dominant and non-dominant legs performed significantly better than those at the other two types of DH in terms of leg stiffness and power for males with different exercise levels. At H-SLDJ, for males with different exercise levels, dominant leg had significantly better performance in leg stiffness, power etc. than non-dominant leg. Conclusions: The M-SLDJ designed in this study can be used by college athletes or students majoring in physical education for unilateral lower limb DJ training to maximize the performance of dominant or non-dominant leg. Due to the significant difference between two legs in the case of H-SLDJ, the eccentric contraction ability and stability of the non-dominant leg should be enhanced during the training to avoid bilateral imbalance.
    Keywords male ; drop jump ; unilateral lower limb ; optimal drop height ; Medicine (General) ; R5-920
    Subject code 796
    Language English
    Publishing date 2022-05-01T00:00:00Z
    Publisher MRE Press
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: The Influence on Post-Activation Potentiation Exerted by Different Degrees of Blood Flow Restriction and Multi-Levels of Activation Intensity

    Hang Zheng / Jiajun Liu / Jia Wei / Hui Chen / Shan Tang / Zhexiao Zhou

    International Journal of Environmental Research and Public Health, Vol 19, Iss 10597, p

    2022  Volume 10597

    Abstract: 1) Background: To explore the influence on post-activation potentiation (PAP) when combining different degrees of blood flow restriction (BFR) with multi-levels of resistance training intensity of activation. (2) Purpose: To provide competitive athletes ...

    Abstract (1) Background: To explore the influence on post-activation potentiation (PAP) when combining different degrees of blood flow restriction (BFR) with multi-levels of resistance training intensity of activation. (2) Purpose: To provide competitive athletes with a more efficient and feasible warm-up program. (3) Study Design: The same batch of subjects performed the vertical jump test of the warm-up procedure under different conditions, one traditional and six BFR procedures. (4) Methods: Participants performed seven counter movement jump (CMJ) tests in random order, including 90% one repetition maximum (1RM) without BFR (CON), and three levels of BFR (30%, 50%, 70%) combined with (30% and 50% 1RM) (BFR-30-30, BFR-30-50, BFR-50-30, BFR-50-50, BFR-70-30 and BFR-70-50). Jump height (H), mean power output (P), peak vertical ground reaction force (vGRF), and the mean rate of force development (RFD) were recorded and measured. (5) Results: Significantly increasing results were observed in: jump height: CON (8 min), BFR-30-30 (0, 4 min), BFR-30-50 (4, 8 min), BFR-50-30 (8 min), BFR-50-50 (4, 8 min), BFR-70-30 (8 min), ( p < 0.05); and power output: CON (8 min), BFR-30-30 (0, 4 min), BFR-30-50 (4 min), BFR-50-30 (8 min), BFR-50-50 (4, 8 min) ( p < 0.05); vGRF: CON (8 min), BFR-30-30 (0, 4 min), BFR-30-50 (4, 8 min), BFR-50-30 (4 min), BFR-50-50 (4, 8 min) ( p < 0.05); RFD: CON (8 min), BFR-30-30 (0, 4 min), BFR-30-50 (4 min), BFR-50-30 (4 min), BFR-50-50 (4 min) ( p < 0.05). (5) Conclusions: low to moderate degrees of BFR procedures produced a similar PAP to traditional activation. Additionally, BFR-30-30, BFR-30-50, and BFR-50-50 were longer at PAP duration in comparison with CON.
    Keywords post-activation potentiation ; recovery time ; blood flow restriction ; low-intensity ; college athletes ; Medicine ; R
    Subject code 796
    Language English
    Publishing date 2022-08-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Acute effects of different load intensities and rest intervals on muscle strength endurance in male college athletes

    Yuemei Cui / Junjie Mu / Qian Wang / Rui Xi / Yizhou Wang / Dongxue Liu / Xiaoping Chen / Zhexiao Zhou

    Journal of Men's Health, Vol 19, Iss 11, Pp 51-

    2023  Volume 60

    Abstract: The purpose of this study was to compare the effects of different load intensities with rest intervals between sets on heart rate, rating of perceived exertion (RPE), power output, and blood lactate concentration during a squat strength endurance ... ...

    Abstract The purpose of this study was to compare the effects of different load intensities with rest intervals between sets on heart rate, rating of perceived exertion (RPE), power output, and blood lactate concentration during a squat strength endurance training protocol. A total of 4 sets of strength endurance tests were performed on 15 national Level 2 or above athletes with different load intensities (30% of 1 repetition maximum (1RM), 50% 1RM) and different rest intervals between sets (1 min, 2 min), 20 reps per set. Mean power (P-mean), mean heart-rate (HRmean) and RPE variations during the exercise were collected by using a linear position transducer, heart rate monitor, and Borg 6–20 scale. Besides, finger blood was collected before and after the exercise, and analyzed by using a blood lactate analyzer. HRmean, P-mean and RPE values were significantly higher at 50% 1RM load intensity than at 30% 1RM (p < 0.01), HRmean was significantly higher at 1 min rest interval than at 2 min between sets, while P-mean was significantly higher at 2 min rest interval than at 1 min between sets (p < 0.05); at 30% 1RM loading intensity, blood lactate concentrations were significantly higher at the completion of exercise for the 1 min rest interval between sets than for the 2 min (p < 0.01). However, at 50% 1RM loading intensity, blood lactate increased similarly at the completion of training in multiple sets, independent of the rest interval between sets. From a practical point of view, the results suggest that a 1 min rest interval between sets may be sufficient in a strength endurance training protocol when the load intensity is 30% 1RM. However, when the load intensity is 50% 1RM, we suggest that a 2 min rest interval between sets is required for optimal recovery and maintenance of power output.
    Keywords male ; athlete ; strength endurance ; rest interval between sets ; load intensity ; blood lactate ; Medicine (General) ; R5-920
    Subject code 796
    Language English
    Publishing date 2023-11-01T00:00:00Z
    Publisher MRE Press
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: The Associations of Built Environment with Older People Recreational Walking and Physical Activity in a Chinese Small-Scale City of Yiwu

    Jiabin Yu / Chen Yang / Xiaoguang Zhao / Zhexiao Zhou / Shen Zhang / Diankai Zhai / Jianshe Li

    International Journal of Environmental Research and Public Health, Vol 18, Iss 2699, p

    2021  Volume 2699

    Abstract: Physical activity would bring in plenty of health benefits, especially recreational physical activity (RPA). Previous studies have suggested that built environment would affect older people’s recreational walking (RW) and RPA, but how the effects exist ... ...

    Abstract Physical activity would bring in plenty of health benefits, especially recreational physical activity (RPA). Previous studies have suggested that built environment would affect older people’s recreational walking (RW) and RPA, but how the effects exist in a small-scale Chinese city remains unclear. Two hundred and fifty-two older participants were recruited in the city of Yiwu using cross-sectional survey of random samples in 2019. RW and RPA level of participants and perceived scores of built environments were collected using the International Physical Activity Questionnaire and Neighborhood Environment Walkability Scale, respectively. Linear regression analysis was conducted to investigate the association of built environment with older people’s RW and RPA. The results showed that two main factors affecting older people’s RW and RPA were residential density and aesthetics. Additionally, access to services was related to RW, and street connectivity was correlated with RPA. The associations of RW with built environment varied slightly with demographic variables included in the regression model. All the results suggested that lower residential density, better aesthetics environment, and higher street connectivity would motivate older people to engage more in RW and RPA. The better access to services encourages only RW, not RPA, in older people. These findings would be helpful for policy decision makers in the urban construction process in Yiwu. More studies are needed to enlarge the scientific evidence base about small-scale cities in China.
    Keywords over 60 years old ; leisure time ; empirical study ; correlates ; Medicine ; R
    Language English
    Publishing date 2021-03-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Comparing the Kinematic Characteristics of the Lower Limbs in Table Tennis

    Yuqi He, Xiang Lv, Zhexiao Zhou, Dong Sun, Julien S. Baker, Yaodong Gu

    Journal of Sports Science and Medicine, Vol 19, Iss 3, Pp 522-

    Differences between Diagonal and Straight Shots Using the Forehand Loop

    2020  Volume 528

    Abstract: The diagonal shot (DS) and straight shot (SS) using the forehand loop are the most common techniques used in table tennis. The purpose of this study was to investigate the kinematic differences of the lower limbs between DS and SS. Twelve male table ... ...

    Abstract The diagonal shot (DS) and straight shot (SS) using the forehand loop are the most common techniques used in table tennis. The purpose of this study was to investigate the kinematic differences of the lower limbs between DS and SS. Twelve male table tennis athletes performed DS and SS in random order. Kinematic data were captured using a three-dimensional Vicon motion analysis system. The major findings of this study were that DS showed significantly less time compared with SS during the backward swing (BS) and the forward swing (FS) phases. Meanwhile, DS showed significantly larger ankle internal rotation and inversion with smaller knee abduction and external rotation during the BS. DS showed significantly larger knee extension with smaller hip adduction and knee internal rotation compared with SS during the FS. However, SS showed a significantly larger range of motion (ROM) of ankle plantar flexion external rotation, and significantly larger ROM of knee extension. Moreover, SS showed significantly larger knee internal rotation compared with DS. These differences between the two shot techniques could be beneficial for helping coaches and table tennis athletes optimize performance, both in training and competition.
    Keywords table tennis ; forehand loop ; shot techniques ; kinematic ; Sports ; GV557-1198.995 ; Sports medicine ; RC1200-1245
    Subject code 796
    Language English
    Publishing date 2020-09-01T00:00:00Z
    Publisher University of Uludag
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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