43 research outputs found
Relationship between Anthropometrics and Dynamic Balance Performances
No full textDynamic balance performances are highly affected by the base of support, the
center of gravity and its projection within the base of support. Although anthropometric
characteristics could be expected to affect dynamic balance performances1,
there is a need to substantiate this relationship. Therefore, the aim of this study was
to evaluate the relationship between anthropometric measurements and dynamic balance
performances. After signing an informed consent, 26 (female, n=14; male, n=12)
college students (25.7±3.4years) were involved in the study. Body mass, height, sitting
height, and foot size were measured, whereas lower limbs length was calculated
as the difference between standing and sitting height. Dynamic balance performance
was assessed on a wobble board (Balance Board WSP, GSJ Service, Rome, Italy;
diameter=40cm) as the time spent in the target zone (diameter=6.3cm) displayed on
a screen. Participants were asked to stand barefoot on the wobble board with a comfortable
double leg stance, keeping their hands on the hip and looking at the screen
(displaying performance in real time). After a 3-minute familiarization, three 30-second
trials were performed with one minute sitting recovery in between. A correlation
analysis (p<0.05) was applied to anthropometrics and balance performances (the best
score out of three trials). Time in the target zone (12.7±5.9s) was significantly related
to weight (63.8±12.6kg; r=-0.46, p=0.02) and foot size (25.3±1.5cm; r=-0.42, p=0.03),
whereas no significant correlation emerged with respect to height (167.0±10.3cm) and
lower limbs length (79.6±6.7cm). Therefore, individual anthropometric characteristics
should be considered when evaluating dynamic balance performances. Further studies
are needed to investigate the relationship between anthropometric characteristics
and the length and area of sways, and lateral movements of the center of mass
LOAD DISTRIBUTION DURING SUSPENSION TRAINING EXERCISE
No full textINTRODUCTION: Suspension training (ST) uses body weight in multi-directional movements as a form of exercise and due to its feasibility
promotes a large variety of workouts within a low space occupancy. However, only few studies (1,2) investigated the load distribution
during ST, especially during pulling exercises. Therefore, the aims of this study were to evaluate body inclination and ground reaction
force and to predict equations to estimate the training load distribution during ST static back-row at different length of the straps.
METHODS: Thirty volunteers (men=16, women=14; age=23.3±1.7years; body weight=63.9±13.3kg; height=167.9±9.2cm; Body Mass Index
[BMI]=22.5±3.4kg·m-2) performed 14 static ST back-row (holding for 5s) at seven different lengths of ST device (148cm, 158cm, 168cm,
178cm, 188cm, 198cm, 208cm) ranging from the simplest to the most challenging, in 2 different elbow (flexed, extended) positions. A ST
device (AINS ST FIPE, Italy) was anchored at 2.65m above a force platform. Subjects stood barefoot on the force plate, with their feet
shoulder width apart positioned under the anchored point and visual reflective markers applied to subjects’ left lateral malleolus and at
the acromion process. The force platform was used to evaluate the ground reaction force, whereas a video camera was used to record
all the trials. The recorded videos were then analyzed to calculate the body inclination angle with respect to the horizontal plane. Ground
reaction force and body inclination were used to predict training load equations trough multi-level regression models (P<0.05).
RESULTS: Two multi-level regression models were created. In the first one, ground reaction force was used as dependent variable,
whereas body inclination angle, body weight, height, BMI and elbow position were used as independent variables. Significant effects
were found for all variables included in the model, with an Intraclass Correlation Coefficient (ICC) of 0.31. Analyzing the model, the follow-ing equation to estimate the ground reaction force was extrapolated: Load=-132.9134+0.3724671·Angle-1.299028·Body
weight+0.9844512·Height+3.675008·BMI-2.073684·Elbow.
In the second model (ICC of 0.37), the body inclination angle was replaced by the ST device’s length. By analyzing this model, the following equation to estimate the ground reaction force knowing the length of the straps was extrapolated: Load=-69.80267-
0.2199257·Length-1.281452·Body weight+0.8883487·Height+3.624841·BMI+5.188559·Elbow.
CONCLUSION: The proposed models could provide different methods to quantify the training load distribution, even if the use of the
straps’ length could result easier and faster than body inclination angle, helping practitioners and instructors to personalize the workout
to reach specific purposes and provide load progression.
References
1) Giancotti et. al., J Strength Cond Res, 2018.
2) Gulmez, J Strength Cond Res, 2017.
Key-words: body weight; instability; back-row; resistance training; functional training; biomechanic
Riabilitazione in analgesia peridurale delle sindromi algodistrofiche dell'arto inferiore
No full text
Hyperbilirubinemia and management of breastfeeding
No full textHyperbilirubinemia and jaundice are natural, physiological phenomena which are only to be expected in the neonatal period, within certain limits. The highest percentage of jaundice in breastfed newborns should be evaluated in connection with inadequate management of breastfeeding rather than a direct effect of breast milk. Breastfeeding is also linked to visible jaundice persisting beyond the first two weeks of life ( breast milk jaundice ), but the appearance of skin jaundice is not a reason for interrupting breastfeeding which can and should continue without any interruption in most cases. There have been numerous contributions to the literature which have rescaled the direct role of breast milk both in early jaundice and in the more severe cases of late jaundice. The reviewed guidelines for detection and management of hyperbilirubinemia underline how prevention of badly managed breastfeeding and early support for the couple mother-child are effective prevention measures against severe early-onset jaundice; furthermore, the breastfeeding interruption is no longer recommended as a diagnostic procedure to identify breast milk jaundice because of its low specificity and the risk to disregarding the detection of a potentially dangerous disease
Analisi Biomeccanica del Push-up Eseguito in Sospensione
No full textL'allenamento in sospensione, che necessita solo dell’utilizzo di un piccolo attrezzo e del proprio peso corporeo, ha recentemente acquisito grande popolarità. Sebbene la letteratura abbia mostrato che l’esecuzione di esercizi mediante il dispositivo per l’allenamento in sospensione aumenti l’attivazione neuromuscolare rispetto allo stesso esercizio eseguito tradizionalmente, la difficoltà principale sta nel quantificare il carico di lavoro. Infatti, nonostante alcuni ricercatori abbiano affermato che il carico cambi al variare dell’angolo di inclinazione del soggetto o del dispositivo, misurare gli angoli durante una seduta di allenamento risulta complicato, tanto che nessuno studio ha valutato la variazione del carico di lavoro al variare della lunghezza del dispositivo. L’ipotesi dello studio è che il carico di lavoro possa variare al variar della lunghezza del dispositivo per l’allenamento in sospensione. Pertanto lo scopo di questo studio è verificare l'andamento del carico di lavoro al variare della lunghezza delle cinghie durante l'esercizio del push-up eseguito mediante dispositivo per l'allenamento in sospensione. Sedici soggetti volontari (8 femmine e 8 maschi; età 26,8±4,9 anni; massa corporea 62,6±12,2 kg; statura 168,6±9,9 cm; BMI 21,8±2,6 kg/m2) hanno partecipato allo studio. Il protocollo prevedeva l’esecuzione dell’esercizio del push-up mediante dispositivo per l’allenamento in sospensione in 2 diverse posizioni delle braccia in 7 diverse lunghezze del dispositivo, per un totale di 14 push-up statici della durata di 5 secondi ciascuno. Durante gli esercizi, una piattaforma di forza e un trasduttore di forza sono stati utilizzati per registrare rispettivamente il carico al suolo e la forza di trazione applicata al dispositivo. Tutte le prove sono state registrate mediante una videocamera e analizzate successivamente mediante un software di video analisi per valutare l’angolo di inclinazione del soggetto rispetto al suolo. I risultati hanno mostrato come il carico di lavoro si modifichi al variare sia dell’angolo di inclinazione del soggetto, sia della lunghezza del dispositivo utilizzato. In particolare, all’aumentare della lunghezza del dispositivo, aumenta il carico di trazione sul dispositivo stesso mentre diminuisce la forza al suolo. In conclusione possiamo affermare che, durante l’esercizio del push-up, la distribuzione del carico tra arti superiori e inferiori varia sia al variare dell’angolo di inclinazione del soggetto, sia al variare della lunghezza delle cinghie di regolazione. Questi risultati potrebbero aiutare a personalizzare gli allenamenti e creare una corretta progressione del carico di lavoro, iniziando da lunghezze ridotte per poi aumentarle dopo una fase di familiarizzazione
Biomechanical Analysis of Suspension Training Push-up
No full textThe aims of this study were to evaluate the load distribution between upper and lower extremities during suspension training (ST) push-up at different length of ST device and to predict useful equations to estimate the training load. After giving their informed consent of participation, twenty-five subjects (male=17, female=8; age=28.1+/-5.2years; weight=69.4+/-14.3kg; height=171.6+/-11.3cm; BMI=23.4+/-3.3kg[middle dot]m-2) were involved in the study. Each subject performed 14 static push-ups at 7 different lengths of ST device in two different elbow positions. The load distribution between upper and lower extremities was evaluated through a load cell and a force platform, respectively. To evaluate body inclination all tests were recorded and analyzed through motion analysis software. To estimate the training load a multi-level model regression (P<0.05) was used. Results showed that when the length of ST device increased, the body inclination decreased, while the ground reaction force decreased and the load on the ST device increased. Moreover, when subjects moved from extended to flex elbow, the ground reaction force decreased and the load on the ST device increased. In the created regression model (ICC=0.24), the reaction force was the dependent variable, while length of ST device, BMI, and elbow position were the independent variables. The main findings were that the load distribution between upper and lower extremities changes both when modifying the body inclination and the length of the straps. The use of predicted equations could help practitioners to personalize the workouts according to different specific aims by modifying the length of the ST device to guarantee load progression
Wobble board balance assessment in subjects with chronic ankle instability
No full textBackground: Wobble boards (WBs), commonly used to train postural control, have been recently equipped with accelerometers connected to a computer displaying real-time balance performances. However, little is known about their ability to detect balance deficits in subjects with unilateral chronic ankle instability (CAI).Objective: To determine if computerized WBs can detect balance deficits in subjects with unilateral CAI.Methods: Fifteen subjects with unilateral CAI and fifteen uninjured subjects performed one WB test and one Y Balance Test (YBT) during two separate randomized sessions. WB performance was assessed as the time (s) spent on the platform by keeping it flat at 0 degrees during three 30-s trials for each limb. Normalized (%) reach distances values for anterior, posteromedial, posterolateral directions and composite were recorded for YBT.Results: WB has been shown to be a reliable and accurate device for detecting balance deficits between and within subjects with unilateral CAI. The area under the curve for receiver operating characteristic was 0.80 (asymptotic significance 0.001), suggesting that WBs have the capability to accurately discriminate between injured and uninjured limbs.Significance: Computerized WBs can fill the gap caused by limitations between subjective-based clinical assessment and laboratory-based testing, especially in field-based settings, where specificity, transportability and time constraints are crucial. The results of the present study suggest that WBs may facilitate the detection of balance impairments in subjects with unilateral CAI, without complexity in its use or data interpretation
