scholarly journals The Relationship between Vitamin D Status and Rotator Cuff Muscle Strength in Professional Volleyball Athletes

2019 ◽  
Author(s):  
Do Kyung Kim ◽  
Geon Park ◽  
Liang-Tseng Kuo ◽  
Won hah Park
Keyword(s):  
Vitamin D ◽  
Muscle Strength ◽  
Vitamin D Insufficiency ◽  
Vitamin D Status ◽  
Isokinetic Dynamometer ◽  
Shoulder Muscle ◽  
Volleyball Players ◽  
The Relationship ◽  
Shoulder Muscle Strength ◽  
External Rotator

This study aimed to examine the vitamin D status of professional volleyball athletes and to determine its correlation with shoulder muscle strength. We finally included 52 healthy male professional volleyball players (23.2 ± 4.5 years), who were categorized by vitamin D status (<20 ng/mL: deficiency, 20-30 ng/mL: insufficiency, and >30 ng/mL: sufficiency). We examined the strength of the internal rotator (IR) and external rotator (ER) muscles of the shoulder by using isokinetic dynamometer. Fourteen players (26.9%) had vitamin D deficiency, 24 players (46.2%) were vitamin D insufficient, and 14 players (26.9%) were vitamin D sufficient. There was no significant correlation between the vitamin D level and shoulder muscle strength at 60°/s (IR, r = 0.159, p = 0.26; ER, r = 0.245, p = 0.08), and at 180°/s (IR, r = - 0.093, p = 0.51; ER, r = - 0.037, p = 0.79). Moreover, the isokinetic shoulder strengths were not significantly different across the three groups in all settings. In conclusion, vitamin D insufficiency was common in elite volleyball players. Though not being associated with isokinetic muscle weakness, vitamin D should be regularly monitored and supplemented in young elite athletes, considering its importance on musculoskeletal health.

scholarly journals The Relationship between Vitamin D Status and Rotator Cuff Muscle Strength in Professional Volleyball Athletes

Nutrients ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2768 ◽  
Author(s):  
Do Kyung Kim ◽  
Geon Park ◽  
Liang-Tseng Kuo ◽  
Won Hah Park
Keyword(s):  
Vitamin D ◽  
Muscle Strength ◽  
Vitamin D Insufficiency ◽  
Vitamin D Status ◽  
Shoulder Muscle ◽  
Vitamin D Levels ◽  
Volleyball Players ◽  
The Relationship ◽  
Shoulder Muscle Strength ◽  
External Rotator

This study aimed to examine the vitamin D status of professional volleyball athletes and to determine its correlation with shoulder muscle strength. We included 52 healthy male professional volleyball players (23.2 ± 4.5 years), who were categorized by vitamin D status (<20 ng/mL: deficiency, 20–30 ng/mL: insufficiency, and >30 ng/mL: sufficiency). We examined the strength of the internal rotator (IR) and external rotator (ER) muscles of the shoulder by using an isokinetic dynamometer. Fourteen players (26.9%) had vitamin D deficiency, 24 players (46.2%) were vitamin D-insufficient, and 14 players (26.9%) were vitamin D-sufficient. There was no significant correlation between vitamin D level and shoulder muscle strength at 60°/s (IR, r = 0.159, p = 0.26; ER, r = 0.245, p = 0.08) and at 180°/s (IR, r = −0.093, p = 0.51; ER, r = −0.037, p = 0.79). Moreover, the isokinetic shoulder strengths were not significantly different across the three groups in all settings. In conclusion, vitamin D insufficiency was common in elite volleyball players. Though not being associated with isokinetic muscle weakness, vitamin D levels should be regularly monitored, and vitamin D should be supplied to young elite athletes, considering its importance for musculoskeletal health.

scholarly journals Suppression of Parathyroid Hormone as a Proxy for Optimal Vitamin D Status: Further Analysis of Two Parallel Studies in Opposite Latitudes

Nutrients ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 942 ◽  
Author(s):  
Marcela M. Mendes ◽  
Kathryn H. Hart ◽  
Susan A. Lanham-New ◽  
Patrícia B. Botelho
Keyword(s):  
Vitamin D ◽  
Parathyroid Hormone ◽  
Total Sample ◽  
Vitamin D Insufficiency ◽  
Vitamin D Supplementation ◽  
Vitamin D Status ◽  
Low Latitude ◽  
Vitamin D Levels ◽  
Cubic Model ◽  
The Relationship

Optimal vitamin D status has commonly been defined as the level of 25-hydroxyvitamin D (25(OH)D) at which parathyroid hormone (PTH) concentrations would be maximally suppressed, represented by an observed minimum plateau. Previous findings indicate a large variation in this plateau, with values ranging from <30 nmol/L up to 100 nmol/L. This disparity in values might be explained by differences in study design and methodology, ethnicity, age, gender and latitude. This study aimed to investigate the concentration of 25(OH)D at which PTH concentrations were suppressed in Brazilian women living in opposite latitudes (high vs. low: i.e., UK and Brazil), during wintertime. Using data from the D-SOL study (Interaction between Vitamin D Supplementation and Sunlight Exposure in Women Living in Opposite Latitudes), the association between 25(OH)D status and PTH levels were examined in 135 Brazilian women (56 living in England and 79 living in Brazil, aged 20–59 years old). Mean PTH concentrations for Brazilian women with vitamin D deficiency (<25 nmol/L) were significantly higher compared to those with vitamin D insufficiency (25–49.9 nmol/L) (p < 0.01), vitamin D adequacy (50–74.9 nmol/L) (p < 0.01) and those with optimal vitamin D status (>75 nmol/L) (p < 0.001). Regression modelling was used to investigate the relationship between serum 25(OH)D and PTH for the sample as a whole and for each group separately. A cubic model was statistically significant for the total sample (p < 0.001), whereas a linear model presented the best fit for Brazilian women living in England (p = 0.04) and there were no statistically significant models fitted for Brazilian women living in Brazil. The cubic model suggests that 25(OH)D concentrations above 70–80 nmol/L are optimal to suppress the parathyroid gland in Brazilian women. These findings contribute to a better understanding of the relationship between 25(OH)D and PTH in populations living in a low latitude location and are of great relevance for discussions regarding the estimation of optimal cut-offs for vitamin D levels in the Brazilian population as well as for other low latitude locations.

Vitamin D Status and Muscle Function Among Adolescent and Young Swimmers

2017 ◽  
Vol 27 (5) ◽  
pp. 399-407 ◽  
Author(s):  
Nina Rica Wium Geiker ◽  
Mette Hansen ◽  
Jette Jakobsen ◽  
Michael Kristensen ◽  
Rikke Larsen ◽  
...  
Keyword(s):  
Vitamin D ◽  
Muscle Strength ◽  
Grip Strength ◽  
Muscle Function ◽  
Sun Exposure ◽  
Vitamin D Insufficiency ◽  
Vitamin D Status ◽  
Hand Grip ◽  
Elite Swimmers ◽  
Sufficient Vitamin

Impaired muscle function has been coupled to vitamin D insufficiency in young women and in elderly men and women. Those living at Northern latitudes are at risk for vitamin D insufficiency due to low sun exposure which may be more pronounced among elite swimmers because of their indoor training schedules. We aimed to examine vitamin D status among young elite swimmers and evaluate the association between vitamin D status and muscle strength. Twenty-nine swimmers, 12 female and 17 male (16–24 years) residing at latitude 55–56°N were studied in March and April. Blood samples were analyzed for serum 25-hydroxyvitamin D (s-25(OH)D) and hand-grip strength was measured as marker of muscle strength. Subjects´ vitamin D and calcium intake were assessed by food frequency questionnaire and sun exposure and training status by questionnaires. Mean (± SD) s-25(OH)D was 52.6 ± 18.3nmol/L among all swimmers. In 45% of the swimmers s-25(OH)D was below 50 nmol/L. Female swimmers had higher s-25(OH)D concentration than male swimmers (61.7 ± 17,5 nmol/L vs. 46.2 ± 16,5 nmol/L, p = .026). Among male swimmers, those with sufficient vitamin D status had higher hand grip strength than those with insufficient vitamin D status (50.6 ± 6.4 kg vs. 41.1 ± 7.8 kg, p = .02). Among Danish elite swimmers 45% had an insufficient vitamin D status during the spring; the prevalence being higher among male swimmers. Muscle strength was significantly higher in male swimmers with sufficient vitamin D status.

Head and Shoulder Functional Changes in Flutists

2013 ◽  
Vol 28 (3) ◽  
pp. 145-151 ◽  
Author(s):  
Ziliane LO Teixeira ◽  
Filipa MB Lã ◽  
Anabela G da Silva
Keyword(s):  
Muscle Strength ◽  
Matched Control ◽  
Control Group ◽  
Isokinetic Dynamometer ◽  
Forward Head Posture ◽  
Functional Changes ◽  
Head Posture ◽  
Music Medicine ◽  
Shoulder Muscle ◽  
Shoulder Muscle Strength

AIMS: This study aimed at comparing head posture, symmetry of shoulder muscle strength, and posture among developing flutists, professional flutists, and a matched control group of singers. METHODS: Measurements of head and scapular posture and muscle strength were compared between flutists with ≤10 yrs of practice (developing flutists, n=9), flutists with >10 years of practice (professional flutists, n=9), and singers (n=9). Posture was measured with a goniometer and tape measure; strength was assessed with an isokinetic dynamometer. RESULTS: Significant differences were found between groups concerning forward head posture only; developing flutists showed a higher forward head posture compared to the other two groups (p<0.05). No significant differences were found for scapular posture or muscle strength. CONCLUSIONS: Developing flutists showed significantly more forward head posture. This finding supports the need to revise existing music curricula targeting the inclusion of compulsory disciplines on music medicine.

scholarly journals Association of Vitamin D Status with Lower Limb Muscle Strength in Professional Basketball Players: A Cross-Sectional Study

Nutrients ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2715
Author(s):  
Do Kyung Kim ◽  
Geon Park ◽  
Liang-Tseng Kuo ◽  
Won-Hah Park
Keyword(s):  
Vitamin D ◽  
Muscle Strength ◽  
Lower Limb ◽  
Knee Extension ◽  
Vitamin D Insufficiency ◽  
Vitamin D Status ◽  
Basketball Players ◽  
Cross Sectional ◽  
Professional Basketball ◽  
Vitamin D Levels

Vitamin D deficiency in athletes may play a role in influencing fracture risk and athletic performance. This study aimed to examine the vitamin D status of basketball players and determine its correlation with muscle strength. We included 36 male professional basketball players (mean age, 22.6 ± 3.2 years) categorized by vitamin D status. We examined the muscle strength of knee extension/flexion and ankle dorsiflexion/plantarflexion using an isokinetic dynamometer. Eleven (30.5%), fifteen (41.7%), and ten (27.8%) players had deficient (<20 ng/mL), insufficient (20–32 ng/mL), and sufficient vitamin D levels (>32 ng/mL), respectively. In the dominant side, there were no significant correlations of vitamin D level with knee extension/flexion strength (r = 0.134, p = 0.436; r = −0.017, p = 0.922, respectively), or with plantarflexion/dorsiflexion ankle strength (r = −0.143, p = 0.404; r = 1.109, p = 0.527, respectively). Moreover, the isokinetic lower limb strengths were not significantly different between the three groups in all settings (all p > 0.05). In conclusion, professional basketball players had a high prevalence of vitamin D insufficiency. Though it may not be associated with muscle strength, maintaining adequate vitamin D levels by micronutrients monitoring, regular dietician consultation, and supplementation is still a critically considerable strategy to enhance young athletes’ health.

ASSESSING THE RELATIONSHIP BETWEEN VITAMIN D STATUS AND IMPAIRMENTS IN COGNITIVE AND PHYSICAL PERFORMANCE IN OLDER ADULTS USING A DUAL TASK PHYSICAL PERFORMANCE TEST

2016 ◽  
pp. 1-8
Author(s):  
J. Lopez ◽  
A. Campa ◽  
J.E. Lewis ◽  
F.G. Huffman ◽  
J.P. Liuzzi ◽  
...  
Keyword(s):  
Vitamin D ◽  
Physical Performance ◽  
Dual Task ◽  
Performance Test ◽  
Executive Dysfunction ◽  
The Elderly ◽  
Vitamin D Insufficiency ◽  
Gait Velocity ◽  
Vitamin D Status ◽  
The Relationship

Background: Vitamin D deficiency has been associated with an increased risk of falls in older adults. Several studies have demonstrated an association between vitamin D deficiency and gait and cognitive impairments, which are two risk factors for falls in the elderly. There is lack of research about the role of vitamin D in cognitive function in the context of mobility. Objective: The purpose of this study was to evaluate the association between vitamin D status with the age-related changes in mobility through higher order cognitive function using a dual task physical performance test. Design: Cross-sectional Setting: Community-dwelling older adult population located in Miami, Fl. Participants: Healthy participants over the age of 55 (n=97) who participated in the parent interventional study. Measurements: Participants completed assessments that included serum levels of vitamin D, surveys, and dual task physical performance tests. Spearman’s correlations, independent t-tests, repeated measures ANOVAs and multiple logistic regressions were used to examine the relationship between vitamin D insufficiency (25-hydroxyvitamin D <30 ng/ml) and sufficiency (≥30 ng/ml) and dual task physical performance variables. The significance level was set at α=0.05. Results: There were no significant associations between vitamin D insufficiency and gait velocity during either task. Using Spearman correlations, slower single (P=0.011) and dual task counting rates (P=0.006) were significantly associated with vitamin D insufficiency. Independent t-tests showed dual and single task counting rates were significantly lower in the vitamin D insufficient group compared to the sufficient group (P=0.018 and P=0.028, respectively). The results for the ANOVAs indicated that velocities and counting rates were not significantly different by vitamin D status (Wilk’s Lambda =0.999; F (1, 95) =.11, P=.740) (Wilk’s Lambda =.999, F(1,95)=.13, P=.718). Vitamin D status was not significantly associated with dual task physical performance (defined as the difference in dual and single task) in gait velocity (OR=1.00, 95% CI: 0.98; 1.02, P=0.772) and counting rate (OR=1.684, 95% CI: 0.15; 19.57, P=0.677), when controlling for confounders. Conclusions: Since counting backward is a mental tracking task, which is a component of executive function, our results suggest a relationship between vitamin D insufficiency and executive dysfunction. Executive dysfunction has been previously associated with fall risks in the elderly, and it could be a possible mediator between vitamin D and falls. Our data suggest that cognition may play a significant role in vitamin D’s influence on falls, while motor function may play a lesser role.

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