Effect of low-repetition jump training on bone mineral density in young women

Abstract

The hypothesis of the present study was that low-repetition and high-impact training of 10 maximum vertical jumps/day, 3 times/wk would be effective for improving bone mineral density (BMD) in ordinary young women. Thirty-six female college students, with mean age, height, and weight of 20.7+/-0.7 yr, 158.9+/-4.6 cm, and 50.4+/-5.5 kg, respectively, were randomly divided into two groups: jump training and a control group. After the 6 mo of maximum vertical jumping exercise intervention, BMD in the femoral neck region significantly increased in the jump group from the baseline (0.984+/-0.081 vs. 1.010+/-0.080 mg/cm2; P<0.01), although there was no significant change in the control group (0.985+/-0.0143 vs. 0.974+/-0.134 mg/cm2). And also lumbar spine (L2-4) BMD significantly increased in the jump training group from the baseline (0.991+/-0.115 vs. 1.015+/-0.113 mg/cm2; P<0.01), whereas no significant change was observed in the control group (1.007+/-0.113 vs. 1.013+/-0.110 mg/cm2). No significant interactions were observed at other measurement sites, Ward's triangle, greater trochanter, and total hip BMD. Calcium intakes and accelometry-determined physical daily activity showed no significant difference between the two groups. From the results of the present study, low-repetition and high-impact jumps enhanced BMD at the specific bone sites in young women who had almost reached the age of peak bone mass.

Current Concepts for Rehabilitation and Return to Sport After Knee Articular Cartilage Repair in the Athlete

“…While the effects of plyometric training on patients recovering from knee injuries, especially after articular cartilage repair, are unknown, it may be a critical training method to safely return athletes to full sports participation. 24,60,70,81,87,94,110,120,130,131 Because of the considerable loads and speeds applied to the healing joint with plyometric training, patients should first demonstrate the ability to tolerate the demands of daily activities without pain or swelling. 24 Clinicians must be diligent in monitoring the patient's response to training, using effusion grading and soreness rules.…”

A meta-analysis of brief high-impact exercises for enhancing bone health in premenopausal women

“…Only two of the six studies [19,21] reported concealed allocation of subjects to their respective groups (semi-blinded). Bassey and Ramsdale [18] reported outcome assessor blinding to group allocation of participants.…”

“…With a '2' rating, on a scale of 1 to 3, most of the studies were classified as having moderate methodological quality [18-20, 24, 26]. Only one study [21] was considered to have high methodological quality with a rating of '1'. All the trials were conducted with apparently healthy premenopausal women between the ages of 18 and 50 years.…”

“…Similar strain patterns in the form of high-impact exercise interventions have been adapted for women and yielded promising results [18][19][20][21]. An evidence-based synthesis of these types of intervention, in a bid to specify practical lifestyle exercises for enhancing bone health and preventing osteoporosis, is warranted.…”

Efectos del entreanamiento pliométrico acuático vs. seco sobre el salto vertical / Effects of land vs. Aquatic Plyometric Training on Vertical Jump

“…Estas mejoras del rendimiento tras la realización de un EP podrían deberse a una serie de adaptaciones músculo-funcionales producidas por el propio EP (Kato et al, 2006;Kubo et al, 2007;Grosset et al, 2009). Por otro lado, tal y como se ha mostrado en otras investigaciones (Harrison et al, 2001;Hennessy et al, 2001;Myer et al, 2005), al combinar el EP y acciones de máximas de corta duración, se puede mejorar la fuerza muscular, el salto vertical y la velocidad.…”