SPORTS MEDICINE
Strengthen to Lengthen
Resistance training can reap the same benefits as stretching if performed with a consistent range of motion BY DR. SYL CORBETT, DC, PH.D Endurance athlete, scientist and coach specializing in physical literacy and brain health; founder Athleticwise and Rock On, based in Calgary, AB. LIFE.ROCKS.FITNESS
LIFE.ROCKS.FITNESS
ROCKONCLAY
I
f you’re among the many athletes that love training, but seldom take the time to stretch, you’re not necessarily doomed to a rigid fate. Resistance training is renowned for building muscle mass and enhancing strength and is often needlessly associated with tight muscles and joint stiffness. In fact, when performed with proper form, appropriate loads, and adequate recovery – assuming sufficient nutrition and hydration – resistance training may improve mobility and augment the involved joint’s articulation. Range of motion (ROM), including both passive and active elements, is the degree to which a joint can move within its physiological limits. Adequate joint ROM permits correct biomechanics, preventing movement-related dysfunctions and reducing the risk of musculoskeletal injuries. Additionally, it plays a vital role in muscle flexibility, proprioceptive feedback, and overall joint health. A well-maintained joint ROM is essential for promoting functional independence and enhancing sports performance. ROM is of fundamental importance influencing our physical abilities whether it be accomplishing regular daily tasks, fluidly executing a Turkish get-up or running a blazing 400 metre race. ROM is confined by diverse components such as neural control, the flexibility of muscles, ligaments, tendons, fascia, and the morphology of the joint itself. Stretching has perhaps guilelessly been considered the lone method of ameliorating a joint’s range, yet resistance training may yield similar results.
NEURAL ADAPTATIONS A principal mechanism through which resistance training improves ROM is via neural adaptations. Joint movements caused by muscular contractions are governed by the nervous system. Resistance training provides a strong stimulus leading to neural adaptations such as improved motor unit recruitment, synchronization, and neural drive. Notable benefits of such would include greater muscular control and coordination, enabling a wider range of motion of the joints in the specifically trained movement patterns.
62 I Fall Fitness & Food Issue 2023 I IMPACT MAGAZINE
MUSCULAR HYPERTROPHY Muscular hypertrophy – the remodelling of muscle fibres which in turn lead to an increase in size of skeletal muscle – may contribute to joint stability and support thereby allowing a more substantial ROM. However, it is important to note the hypertrophic response is highly dependent upon the characteristic length-tension curves of different muscles, the specific exercises and joints involved, the various ranges of training, site of assessment, anatomical attributes, etc.
MUSCULAR LENGTH Muscular length adaptations are vital for improved ROM. Conventional resistance training entails concentric, isometric, and eccentric muscle contractions. The latter, as it is capable of handling higher loads, may affect a greater stimulus to boost ROM. Incorporating eccentric muscle contractions and training at lengthened positions may influence sarcomere (functional unit of a muscle) addition and the lengthtension relationship within muscle fibres. This process allows muscles to tolerate greater stretching forces, likewise, potentially leading to a broader ROM.
CONNECTIVE TISSUE Connective tissues – tendons and ligaments – similarly play a determinative role in ROM. The mechanical loading on these tissues elicited by resistance training, triggers a series of adaptive responses. The synthesis of collagen and other structural proteins increase in number, size, and density, leading to greater tissue stiffness and strength. This phenomenon contributes to joint stability and improves functional ROM by reducing the risk of structural damage during extreme movements.